10767( 3) - 10/14/05 09:27 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10767 Version: 3 Check-in Time: 14-Oct-2005 13:27:00 Title Further Resolving the Puzzle of Hybrid Star X-rays ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 14 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Thomas R. Ayres University of Colorado at Boulder CoI: Dr. Alexander Brown University of Colorado at Boulder N CoI: Dr. Graham M. Harper University of Colorado at Boulder N ------------------------------------------------------------------------------------ Abstract Do Alpha TrA (K2II) and Beta Ind (K1II) have previously unrecognized X-ray active dwarf companions, leading us astray concerning the coronal properties of the "hybrid-chromosphere" class? Establishing the true X-ray luminosities of the hybrids is a basis for understanding magnetic field generation in evolved supergiants, the driving of their winds, and the seeding of coronal conditions in their extended outer envelopes. It also bears on the issue of late-type dwarfs orbiting main sequence B stars, the evolutionary predecessors of K bright giants. We propose to directly image the putative hybrid companions using Chandra, with supporting observations from HST/WFPC2. ------------------------------------------------------------------------------------ Observations Description ------------------------ The two targets, both K-type supergiants, will be observed with the WFPC2/F160BW in an attempt to detect close UV-bright companions, thought to be responsible for the anomalous X-ray lproperties. Three HST orbits will be devoted to each star, each visit at a different ORIENT to avoid hiding the companion under a psf artifact. During each visit, six 300 s exposures will be taken, in a 2-pt spatial dither with 3 images at each pointing to mitigate cosmic rays. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10767( 3) - 10/14/05 09:27 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD150798 STAR, K III-I RA=16H48M39.8900S +/- 0.1", J2000 V = -3.3 V = 1.92+/-0.1 DEC=-69D01'39.80" +/- 0.1" Coordinate Source: Other_Source: SIMBAD Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.0 0.014 -0.034 0.00785 2 HD198700 STAR, K III-I RA=20H54M48.6000S +/- 0.1", J2000 V = -4.9 V = 3.66+/-0.1 DEC=-58D27'15.00" +/- 0.1" Coordinate Source: Other_Source: SIMBAD Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.0 0.017 -0.026 0.00541 10767( 3) - 10/14/05 09:27 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFPC2-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.3535 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 45.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 10767( 3) - 10/14/05 09:27 - [ 4] Visit: 01 Visit Priority: Visit Requirements: ORIENT 40.0D TO 50.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD150798 WFPC2 IMAGE PC1 F160BW CR-SPLIT=0.546 1 1100 S PATTERN 1 1 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD150798 1 WFPC2 IMAGE PC1 F160BW 1 none none 1 1 700.0 S HD150798 1 WFPC2 IMAGE PC1 F160BW 1 none none 2 1 500.0 S HD150798 1 WFPC2 IMAGE PC1 F160BW 2 none none 1 1 700.0 S HD150798 1 WFPC2 IMAGE PC1 F160BW 2 none none 2 1 500.0 S 10767( 3) - 10/14/05 09:27 - [ 5] Visit: 02 Visit Priority: Visit Requirements: ORIENT 95.0D TO 105.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD150798 WFPC2 IMAGE PC1 F160BW CR-SPLIT=0.546, 1 1100 S PATTERN 1 1 CR-TOLERANCE=0.10 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD150798 1 WFPC2 IMAGE PC1 F160BW 1 none none 1 1 700.0 S HD150798 1 WFPC2 IMAGE PC1 F160BW 1 none none 2 1 500.0 S HD150798 1 WFPC2 IMAGE PC1 F160BW 2 none none 1 1 700.0 S HD150798 1 WFPC2 IMAGE PC1 F160BW 2 none none 2 1 500.0 S 10767( 3) - 10/14/05 09:27 - [ 6] Visit: 03 Visit Priority: Visit Requirements: ORIENT 340.0D TO 350.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD150798 WFPC2 IMAGE PC1 F160BW CR-SPLIT=0.546 1 1100 S PATTERN 1 1 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD150798 1 WFPC2 IMAGE PC1 F160BW 1 none none 1 1 700.0 S HD150798 1 WFPC2 IMAGE PC1 F160BW 1 none none 2 1 500.0 S HD150798 1 WFPC2 IMAGE PC1 F160BW 2 none none 1 1 700.0 S HD150798 1 WFPC2 IMAGE PC1 F160BW 2 none none 2 1 500.0 S 10767( 3) - 10/14/05 09:27 - [ 7] Visit: 04 Visit Priority: Visit Requirements: ORIENT 25.0D TO 35.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD198700 WFPC2 IMAGE PC1 F160BW CR-SPLIT=DEF 1 1000 S PATTERN 1 1 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD198700 1 WFPC2 IMAGE PC1 F160BW 1 none none 1 1 500.0 S HD198700 1 WFPC2 IMAGE PC1 F160BW 1 none none 2 1 600.0 S HD198700 1 WFPC2 IMAGE PC1 F160BW 2 none none 1 1 500.0 S HD198700 1 WFPC2 IMAGE PC1 F160BW 2 none none 2 1 600.0 S 10767( 3) - 10/14/05 09:27 - [ 8] Visit: 05 Visit Priority: Visit Requirements: ORIENT 260.0D TO 270.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD198700 WFPC2 IMAGE PC1 F160BW CR-SPLIT=DEF 1 1000 S PATTERN 1 1 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD198700 1 WFPC2 IMAGE PC1 F160BW 1 none none 1 1 500.0 S HD198700 1 WFPC2 IMAGE PC1 F160BW 1 none none 2 1 600.0 S HD198700 1 WFPC2 IMAGE PC1 F160BW 2 none none 1 1 500.0 S HD198700 1 WFPC2 IMAGE PC1 F160BW 2 none none 2 1 600.0 S 10767( 3) - 10/14/05 09:27 - [ 9] Visit: 06 Visit Priority: Visit Requirements: ORIENT 315.0D TO 325.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD198700 WFPC2 IMAGE PC1 F160BW CR-SPLIT=DEF 1 1000 S PATTERN 1 1 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD198700 1 WFPC2 IMAGE PC1 F160BW 1 none none 1 1 500.0 S HD198700 1 WFPC2 IMAGE PC1 F160BW 1 none none 2 1 600.0 S HD198700 1 WFPC2 IMAGE PC1 F160BW 2 none none 1 1 500.0 S HD198700 1 WFPC2 IMAGE PC1 F160BW 2 none none 2 1 600.0 S 10767( 3) - 10/14/05 09:27 - [ 10] Summary Form for Proposal 10767 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=0.546 CR-TOLERANCE=0.10 CR-SPLIT=DEF ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 40.0D TO 50.0 D PATTERN 1 1 ORIENT 95.0D TO 105.0 D ORIENT 340.0D TO 350.0 D ORIENT 25.0D TO 35.0 D ORIENT 260.0D TO 270.0 D ORIENT 315.0D TO 325.0 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160BW ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD150798 HD198700 ------------------------------------------------------------------------------------------------------------------------------------