SOLVING THE LONG-STANDING MYSTERY OF GAMMA CASSIOPEIAE WITH RESOLVE
Binary evolution is one of the most fundamental ingredients in astronomy. Binaries consisting of a high-mass star and a compact object constitute an important milestone in the evolution. Gamma Cas and its analogs could be the long-sought missing population of Be/WD binaries, though an alternative scenario exists. The two scenarios (a) Be/WD binary and (b) magnetic disk-star interaction on Be star surface differ most distinctively in the production site of the hard X-rays. We propose two straightforward and fully independent tests with Resolve to distinguish (a) and (b); the test 1 is the RV change of Fe lines as a function of the orbital phase. The test 2 is the line profile of the flurescent Fe Ka lines. Based on our PV experience, the two tests are only possible with Resolve.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'RESOLVE ' / Instrument name FILTER = 'OPEN ' / Filter name used OBS_ID = '201004010' / Observation identification string OBJECT = 'GAMMA_CASSIOPEIAE' / Object name OBSERVER= 'MASAHIRO TSUJIMOTO' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 14.1772 / [deg] Object Right ascension DEC_OBJ = 60.7168 / [deg] Object Declination RA_PNT = 14.185674843979 / Pointing RA DEC_PNT = 60.7206563876944 / Pointing DEC RA_NOM = 14.1806015593371 / [deg] Nominal aspect point R.A. DEC_NOM = 60.7174083515504 / [deg] Nominal aspect point Dec. PA_NOM = 223.952851622225 / [deg] Nominal aspect point roll. TELAPSE = 105130.181159019 / Elapsed time DATE-OBS= '2025-02-15T05:08:46.846463' / Start date DATE-END= '2025-02-16T10:20:57.027622' / Stop date ONTIME = 59292.304469 / On-source time EXPOSURE= 59292.304469 / Exposure time PROCVER = '03.00.013.010' / Processing script version MKFFF = 'ISAS/JAXA' / Origin of First FITS file ORIGIN = 'GSFC/NASA' / Origin of Processed FITS file SOFTVER = 'Hea_21Aug2024_V6.34_XRISM_21Aug2024_V001' / Version of HEADAS used CALDBVER= 'gen20241115_xtd20241115_rsl20241115' / Version of CALDB used DATE = '2025-03-20T11:33:35' / Date and time this file was created or updated SIB2_VER= 'V03.01 ' / SIB2 version JAXA