XRISM XTEND observation 201103010

Title

TESTING THE WHITE DWARF HYPOTHESIS FOR GAMMA CAS COMPANIONS

Abstract

We propose to observe the two brightest gamma Cas-type stars: gamma Cas and pi Aqr for 30 and 50 ks, respectively. The X-ray generating mechanism in these stars is unknown, but recent work has attributed it to accretion onto unseen White Dwarf companions. If accretion is the source, then the X-ray spectra can be used to estimate masses and radii of the White Dwarfs from the plasma's maximum temperature, Fe K line shape quantities, and the mass-accretion rate from a cooling flow model; all of which should be self-consistent. Our plan is to use the high resolution and high energy sensitivity of XRISM to resolve both line emission and thermal continuum turn-over to constrain these quantities and calculate masses and radii as a method testing the self-consistency of the White Dwarf hypothesis.

FITS header

TELESCOP= 'XRISM   '           / Mission name
INSTRUME= 'XTEND   '           / Instrument name
OBS_ID  = '201103010'          / Observation identification string
OBJECT  = 'PI_AQR  '           / Object name
OBSERVER= 'SEAN GUNDERSON'     / PI name
OBS_MODE= 'POINTING'           / POINTING or SLEW or ALL
RA_OBJ  =             336.3193 / [deg] Object Right ascension
DEC_OBJ =               1.3774 / [deg] Object Declination
RA_PNT  =     336.320770818296 / Pointing RA
DEC_PNT =     1.37975529323651 / Pointing DEC
RA_NOM  =     336.319878868831 / [deg] Nominal aspect point R.A.
DEC_NOM =     1.37734505414011 / [deg] Nominal aspect point Dec.
PA_NOM  =     250.496860299224 / [deg] Nominal aspect point roll.
TELAPSE =     123614.963135988 / Elapsed time
DATE-OBS= '2024-11-17T13:48:20.036864' / Start date
DATE-END= '2024-11-19T00:08:35' / Stop date
ONTIME  =         51798.371677 / On-source time
EXPOSURE=         51798.371677 / 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    = '2024-12-01T23:34:58' / Date and time this file was created or updated
SIB2_VER= 'V03.01  '           / SIB2 version JAXA

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