15432( 3) - 03-Jan-2018 16:46:38 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15432 Version: 3 Check-in Time: 03-Jan-2018 16:46:38 STScI Edit Number: 0 Title The nature of the current outburst of the Be star HD 6226 ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Noel D. Richardson University of Toledo Y CoI: Dr. Jon E. Bjorkman University of Toledo N CoI: Dr. Karen S. Bjorkman University of Toledo N CoI: Dr. John P. Wisniewski University of Oklahoma Norman Campus N CoI: Dr. Alex Carciofi Universidade de Sao Paulo N CoI: Dr. Rodrigo Vieira Universidade de Sao Paulo N CoI: Dr. Joshua Thomas Clarkson University N CoI: Jonathan Labadie-Bartz Lehigh University N CoI: Mr. James Windsor University of Toledo N ------------------------------------------------------------------------------------ Abstract The Be star HD 6226 has shown quasi-regular photometric outbursts with peaks every ~630 d. These episodes have been shown to correspond to epochs where the star builds an equatorial decretion disk, the signature of classical Be stars. Although the outburst can be anticipated, the exact time of the onset and duration of the episode differ every cycle. During the current disk-building epoch, amateur spectroscopists caught the very beginning of the disk-building through time-resolved H-alpha spectroscopy during 2017 August. This has allowed us to probe the disk evolution both spectroscopically and polarimetrically. We will use the results of this variability campaign to constrain the process by which Be stars build their disks using the viscous decretion disk model, but this can only be accomplished with strong constraints on the stellar parameters and ultraviolet flux. Therefore, we request time with HST to observe HD 6226 with STIS in order to obtain accurate flux measurements and high-resolution spectroscopy in the near future so that the models can be appropriately developed. ------------------------------------------------------------------------------------ Observations Description ------------------------ Our plan is to obtain a STIS echelle spectrum of the Be star HD6226. The first orbit will consist of acquisition of the star and the NUV setups with the E230M centered at 2707 and 1978A. The second orbit will consist of the FUV setup with the E140M grating. ------------------------------------------------------------------------------------ 15432( 3) - 03-Jan-2018 16:46:38 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-6226 STAR, B3-B5 V-IV RA=01H03M53.3583S, J2000 V = 6.82 DEC=+47D38'32.26" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 15432( 3) - 03-Jan-2018 16:46:38 - [ 3] Visit: 01 Visit Requirements: 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-6226 STIS/CCD ACQ F25ND5 MIRROR 1 9 S (9 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-6226 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 9 S (9 S) K D ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-6226 STIS/NUV ACCUM 0.2X0.05N E230M 2707 1 900 S -MAMA D see below (572 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/NUV ACCUM 0.2X0.06 E230M 2707 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 5 HD-6226 STIS/NUV ACCUM 0.2X0.05N E230M 1978 WAVECAL=NO 1 1190 S -MAMA D see below (862 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/NUV ACCUM 0.2X0.06 E230M 1978 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 7 HD-6226 STIS/FUV ACCUM 0.2X0.05N E140M 1425 1 2900 S -MAMA D see below (2919 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 WAVE STIS/FUV ACCUM 0.2X0.06 E140M 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-6226 1 STIS/CCD ACQ F25ND5 MIRROR none none none none 1 N/A HD-6226 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-6226 3 STIS/NUV ACCUM 0.2X0.05 E230M 2707 none none none none 1 572.0 S -MAMA ND WAVE 4 STIS/NUV ACCUM 0.2X0.06 E230M 2707 none none none none 1 N/A -MAMA HD-6226 5 STIS/NUV ACCUM 0.2X0.05 E230M 1978 none none none none 1 862.0 S -MAMA ND 15432( 3) - 03-Jan-2018 16:46:38 - [ 4] 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 | ------------------------------------------------------------------------------------------------------------------------------------ WAVE 6 STIS/NUV ACCUM 0.2X0.06 E230M 1978 none none none none 1 N/A -MAMA HD-6226 7 STIS/FUV ACCUM 0.2X0.05 E140M 1425 none none none none 2 2919.0 S -MAMA ND WAVE 8 STIS/FUV ACCUM 0.2X0.06 E140M 1425 none none none none 2 N/A -MAMA 15432( 3) - 03-Jan-2018 16:46:38 - [ 5] Summary Form for Proposal 15432 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.2X0.05ND, 0.2X0.06, F25ND5 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/PEAK ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters WAVECAL=NO ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements E140M, E230M, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD-6226, WAVE ------------------------------------------------------------------------------------------------------------------------------------