14194( 3) - 03-Sep-2015 16:43:47 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14194 Version: 3 Check-in Time: 03-Sep-2015 16:43:47 STScI Edit Number: 0 Title Precision Masses and Distances of Classical Cepheids ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Nancy R. Evans Smithsonian Institution Astrophysical Y Observatory CoI: Dr. Alexandre Gallenne Universidad de Concepcion N CoI: Dr. Pierre Kervella Observatoire de Paris N CoI: Prof. John D. Monnier University of Michigan N CoI: Dr. Antoine Merand European Southern Observatory - Chile N CoI: Dr. Grzegorz Pietrzynski Universidad de Concepcion N CoI: Dr. Charles R. Proffitt Space Telescope Science Institute N CoI: Dr. Hans Moritz Guenther Massachusetts Institute of Technology N CoI: Dr. Wolfgang Gieren Universidad de Concepcion N ------------------------------------------------------------------------------------ Abstract An important HST UV legacy is the measurement of the masses of Cepheids. Recently optical interferometry with the Very Large Telescope Interferometer (VLTI) and CHARA has resolved a number of Cepheid binary systems, providing combined spectroscopic and visual orbits. In order to fully exploit this data, we are requesting HST high resolution E140H spectra of 4 Cepheid systems (AX Cir, AW Per, Y Car, and V636 Sco) to measure the orbital velocity amplitude of the hot companion, and thereby determine the mass ratio for the Cepheid--companion system (using the ground-based orbit of the Cepheid). The anticipated velocity accuracy from the STIS spectra will result in masses with uncertainties of 5 to 11\%. This will provide a definitive test of evolutionary track physics (specifically main sequence core convective overshoot), and also a comparison of the mass-luminosity relation at two metallicities (the Milky Way and the Large Magellanic cloud). ------------------------------------------------------------------------------------ Observations Description ------------------------ Auto-wavecals will be turned off and replaced with deep wavecals at the beginning and end of each orbit. All but the first wavecal hide in the occultations and or guide-star re-acquisitions. ACQ and ACQ/PEAK exposures will center on the Cepheid. Offset targets are defined for the expected position of the blue companions based on inteferemetric measurements by CoI A Gallenne. Other than the initial ACQ, the exposures for each orbit are put into a non-interruptable sequence to ensure that the wavecals stay close in time to each bracketed science exposure. AX CIR: 1 visit of 1 orbit 14194( 3) - 03-Sep-2015 16:43:47 - [ 2] (1) Acquire target with 0.6s F28X52OIII ACQ exposure (2) 0.2 s ACQ/PEAK with G430L and 0.2X0.09 aperture (3) 120 s WAVE (4) 2014 s E140H 1271 (5) 250 s WAVE AW PER: Two identical visits of 3 orbits each First orbit: (1) Acquire target with 0.2s F28X52OIII ACQ exposure (2) 0.2 s ACQ/PEAK with G430L and 0.2X0.09 aperture (3) 120 s WAVE (4) 1800 s E140H 1416 (5) 250 s WAVE Each of two subsquent orbits: (6) 250 s WAVE (7) 3015 s E140H 1416 (8) 250 s WAVE --------- Additional Comments ---------- Notes to schedulers: The STIS FUV detector background rate increases with time after detector HV turn-on. Since AW Per is rather faint, please SCHEDULE VISITS B1 & B2 AS THE FIRST FUV MAMA VISIT IN EACH DAY'S SAA FREE BLOCK, and START EACH VISIT AS SOON AS POSSIBLE AFTER THAT DAY'S FUV HV RAMPUP. Please do NOT schedule B1 and B2 together in the same SAA free block ------------------------------------------------------------------------------------ 14194( 3) - 03-Sep-2015 16:43:47 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 AX-CIR STAR, B6-B9.5 V-IV, RA=14H52M35.2563S +/- 0.00624", J2000 V = 5.96 Spec=F8II+B6 CEPHEID, COMPOSITE DEC=-63D48'35.39" +/- 0.00492" SPECTRAL TYPE, F3-F9 Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.0015739519162287683 -0.00537 0.00198 ------------------------------------------------------------------------------------------------------------------------------------ 2 AW-PER STAR, B6-B9.5 V-IV, RA=04H47M46.3177S, J2000 V = 7.51 CEPHEID, COMPOSITE DEC=+36D43'22.07" SPECTRAL TYPE, F0-F2 Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 2.1375577629477067E-4 -0.00261 0.00277 ------------------------------------------------------------------------------------------------------------------------------------ 3 AX-CIR-COMPA STAR, B6-B9.5 V-IV RA-OFF=-0.0008886S, J2000 V = 9.21 +/- 0.3 NION DEC-OFF=-0.0291585", FROM 1 Comments: Based on inteferemetric data plus what is known about the orbit, the companion to AX Cir has a predicted position for 2016-03-01 of 2016-03-01: rho = 29.746 mas, theta = -168.594 deg ------------------------------------------------------------------------------------------------------------------------------------ 4 AW-PER-COMPA STAR, B6-B9.5 V-IV RA-OFF=0.0027014S, J2000 V = 10 +/- 1 NION DEC-OFF=0.005560 ", FROM 2 Comments: Based on inteferemetric data plus what is known about the orbit, the companion to AW Per has a predicted position for 2015-10-01 of rho = 32.952 mas, theta = 80.286 deg (A. Gallenne) ------------------------------------------------------------------------------------------------------------------------------------ 14194( 3) - 03-Sep-2015 16:43:47 - [ 4] Visit: 01 Visit Requirements: BEFORE 01-OCT-2016:00:00:00 On Hold Comments: Additional Comments: ACQ and peakup are done on the Cepheid and an offset is done to the expected location of the blue companion based on inteferometric observations. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AX-CIR STIS/CCD ACQ F28X50OII MIRROR 1 0.6 S (0.6 I S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AX-CIR STIS/CCD ACQ/PEA 0.2X0.09 G430L 4300 1 0.2 S (0.2 K S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1271 1 100 S (100 SEQ 3-5 NON-INT -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AX-CIR-COMP STIS/FUV TIME-TA 0.2X0.09 E140H 1271 BUFFER-TIME=102, WAVECAL=NO 1 2034 S ANION -MAMA G (2034 S) Comments: buffer time = 2.0e6/13072 * 0.667 = 102 s ------------------------------------------------------------------------------------------------------------------------------------ 5 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1271 1 100 S (100 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AX-CIR 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A II AX-CIR 2 STIS/CCD ACQ/PEA 0.2X0.09 G430L 4300 none none none none 1 N/A K WAVE 3 STIS/FUV ACCUM 0.2X0.09 E140H 1271 none none none none 1 N/A -MAMA AX-CIR-COMPANION 4 STIS/FUV TIME-TA 0.2X0.09 E140H 1271 none none none none 1 N/A -MAMA G WAVE 5 STIS/FUV ACCUM 0.2X0.09 E140H 1271 none none none none 1 N/A -MAMA 14194( 3) - 03-Sep-2015 16:43:47 - [ 5] Visit: B1 Visit Requirements: BETWEEN 01-AUG-2015 AND 30-NOV-2015; GROUP B1, B2 WITHIN 3D On Hold Comments: Additional Comments: ACQ and peakup are done on the Cepheid and an offset is done to the expected location of the blue companion based on inteferometric observations. Note to schedulers: The STIS FUV detector background rate increases with time after detector HV turn-on. Since our target is rather faint (about 5X average background), please schedule each visit as the first FUV MAMA visit in that day's SAA free block of orbits, and start the visits as soon as possible after the HV is turned on for the day. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AW-PER STIS/CCD ACQ F28X50OII MIRROR 1 0.2 S (0.2 I S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AW-PER STIS/CCD ACQ/PEA 0.2X0.09 G430L 4300 1 0.2 S (0.2 K S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1416 1 50 S (50 SEQ 3-5 NON-INT -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AW-PER-COMP STIS/FUV TIME-TA 0.2X0.09 E140H 1416 BUFFER-TIME=938, WAVECAL=NO 1 1875 S ANION -MAMA G (1875 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1416 1 50 S (50 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1416 1 50 S (50 NEW ALIGNMENT; SEQ 6-8 -MAMA S) NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 7 AW-PER-COMP STIS/FUV TIME-TA 0.2X0.09 E140H 1416 BUFFER-TIME=1508, WAVECAL=NO 1 3015 S ANION -MAMA G (3015 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1416 1 50 S (50 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 9 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1416 1 50 S (50 NEW ALIGNMENT; SEQ 9-11 -MAMA S) NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 10 AW-PER-COMP STIS/FUV TIME-TA 0.2X0.09 E140H 1416 BUFFER-TIME=1508, WAVECAL=NO 1 3015 S ANION -MAMA G (3015 S) ------------------------------------------------------------------------------------------------------------------------------------ 11 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1416 1 50 S (50 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 14194( 3) - 03-Sep-2015 16:43:47 - [ 6] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AW-PER 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A II AW-PER 2 STIS/CCD ACQ/PEA 0.2X0.09 G430L 4300 none none none none 1 N/A K WAVE 3 STIS/FUV ACCUM 0.2X0.09 E140H 1416 none none none none 1 N/A -MAMA AW-PER-COMPANION 4 STIS/FUV TIME-TA 0.2X0.09 E140H 1416 none none none none 1 N/A -MAMA G WAVE 5 STIS/FUV ACCUM 0.2X0.09 E140H 1416 none none none none 1 N/A -MAMA WAVE 6 STIS/FUV ACCUM 0.2X0.09 E140H 1416 none none none none 1 N/A -MAMA AW-PER-COMPANION 7 STIS/FUV TIME-TA 0.2X0.09 E140H 1416 none none none none 2 N/A -MAMA G WAVE 8 STIS/FUV ACCUM 0.2X0.09 E140H 1416 none none none none 2 N/A -MAMA WAVE 9 STIS/FUV ACCUM 0.2X0.09 E140H 1416 none none none none 2 N/A -MAMA AW-PER-COMPANION 10 STIS/FUV TIME-TA 0.2X0.09 E140H 1416 none none none none 3 N/A -MAMA G WAVE 11 STIS/FUV ACCUM 0.2X0.09 E140H 1416 none none none none 3 N/A -MAMA 14194( 3) - 03-Sep-2015 16:43:47 - [ 7] Visit: B2 Visit Requirements: BETWEEN 01-AUG-2015 AND 30-NOV-2015 On Hold Comments: Additional Comments: ACQ and peakup are done on the Cepheid and an offset is done to the expected location of the blue companion based on inteferometric observations. Note to schedulers: The STIS FUV detector background rate increases with time after detector HV turn-on. Since our target is rather faint (about 5X average background), please schedule each visit as the first FUV MAMA visit in that day's SAA free block of orbits, and start the visits as soon as possible after the HV is turned on for the day. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AW-PER STIS/CCD ACQ F28X50OII MIRROR 1 0.2 S (0.2 I S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AW-PER STIS/CCD ACQ/PEA 0.2X0.09 G430L 4300 1 0.2 S (0.2 K S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1416 1 50 S (50 SEQ 3-5 NON-INT -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AW-PER-COMP STIS/FUV TIME-TA 0.2X0.09 E140H 1416 BUFFER-TIME=938, WAVECAL=NO 1 1875 S ANION -MAMA G (1875 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1416 1 50 S (50 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1416 1 50 S (50 NEW ALIGNMENT; SEQ 6-8 -MAMA S) NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 7 AW-PER-COMP STIS/FUV TIME-TA 0.2X0.09 E140H 1416 BUFFER-TIME=1508, WAVECAL=NO 1 3015 S ANION -MAMA G (3015 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1416 1 50 S (50 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 9 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1416 1 50 S (50 NEW ALIGNMENT; SEQ 9-11 -MAMA S) NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 10 AW-PER-COMP STIS/FUV TIME-TA 0.2X0.09 E140H 1416 BUFFER-TIME=1508, WAVECAL=NO 1 3015 S ANION -MAMA G (3015 S) ------------------------------------------------------------------------------------------------------------------------------------ 11 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1416 1 50 S (50 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 14194( 3) - 03-Sep-2015 16:43:47 - [ 8] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AW-PER 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A II AW-PER 2 STIS/CCD ACQ/PEA 0.2X0.09 G430L 4300 none none none none 1 N/A K WAVE 3 STIS/FUV ACCUM 0.2X0.09 E140H 1416 none none none none 1 N/A -MAMA AW-PER-COMPANION 4 STIS/FUV TIME-TA 0.2X0.09 E140H 1416 none none none none 1 N/A -MAMA G WAVE 5 STIS/FUV ACCUM 0.2X0.09 E140H 1416 none none none none 1 N/A -MAMA WAVE 6 STIS/FUV ACCUM 0.2X0.09 E140H 1416 none none none none 1 N/A -MAMA AW-PER-COMPANION 7 STIS/FUV TIME-TA 0.2X0.09 E140H 1416 none none none none 2 N/A -MAMA G WAVE 8 STIS/FUV ACCUM 0.2X0.09 E140H 1416 none none none none 2 N/A -MAMA WAVE 9 STIS/FUV ACCUM 0.2X0.09 E140H 1416 none none none none 2 N/A -MAMA AW-PER-COMPANION 10 STIS/FUV TIME-TA 0.2X0.09 E140H 1416 none none none none 3 N/A -MAMA G WAVE 11 STIS/FUV ACCUM 0.2X0.09 E140H 1416 none none none none 3 N/A -MAMA 14194( 3) - 03-Sep-2015 16:43:47 - [ 9] Summary Form for Proposal 14194 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.2X0.09, F28X50OIII ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/PEAK, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=102, BUFFER-TIME=1508, BUFFER-TIME=938, WAVECAL=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BEFORE 01-OCT-2016:00:00:00, BETWEEN 01-AUG-2015 AND 30-NOV-2015, GROUP B1, B2 WITHIN 3D, NEW ALIGNMENT, SEQ 3-5 NON-INT, SEQ 6-8 NON-INT, SEQ 9-11 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements E140H, G430L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names AW-PER, AW-PER-COMPANION, AX-CIR, AX-CIR-COMPANION, WAVE ------------------------------------------------------------------------------------------------------------------------------------