XRISM XTEND observation 201111010

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Xtend spectrum

p0311: CCD1 & CCD2 in 1/8 window mode

p0311: CCD1 & CCD2 in 1/8 window mode

Xtend light curve

Light curve

Light curve

Title

ESTIMATING THE MASS OF THE WHITE DWARF IN THE INTERMEDIATE POLAR V2400 OPH USING XRISM OBSERVATIONS

Abstract

Masses of white dwarfs (WDs) play an important role in understanding their formation and evolution. A unique way to estimate the mass of a WD in an Intermediate Polar (IP) is to estimate the gravitational redshift of emission lines. We propose 200 kilosec XRISM observations to carry out accurate estimation of the gravitational redshift of emission lines in an IP V2400 Oph and use these measurements to accurately estimate the mass of the WD. The proposed XRISM observation would also serve as a benchmark for carrying out similar investigations for several other moderately bright IPs in future cycles and to estimate the mass of the WDs.

FITS header

TELESCOP= 'XRISM   '           / Mission name
INSTRUME= 'XTEND   '           / Instrument name
OBS_ID  = '201111010'          / Observation identification string
OBJECT  = 'V2400_OPH'          / Object name
OBSERVER= 'NAZMA ISLAM'        / PI name
OBS_MODE= 'POINTING'           / POINTING or SLEW or ALL
RA_OBJ  =             258.1518 / [deg] Object Right ascension
DEC_OBJ =             -24.2458 / [deg] Object Declination
RA_PNT  =     258.153308133636 / Pointing RA
DEC_PNT =    -24.2440470850213 / Pointing DEC
RA_NOM  =     258.151352707561 / [deg] Nominal aspect point R.A.
DEC_NOM =    -24.2458978799446 / [deg] Nominal aspect point Dec.
PA_NOM  =     274.125256704238 / [deg] Nominal aspect point roll.
TELAPSE =     397345.963135988 / Elapsed time
DATE-OBS= '2025-08-15T14:31:26.036864' / Start date
DATE-END= '2025-08-20T04:53:52' / Stop date
ONTIME  =          224235.3079 / On-source time
EXPOSURE=          224235.3079 / Exposure time
PROCVER = '03.02.014.010'      / Processing script version
MKFFF   = 'ISAS/JAXA'          / Origin of First FITS file
ORIGIN  = 'GSFC/NASA'          / Origin of Processed FITS file
SOFTVER = 'Hea_12Mar2025_V6.35_XRISM_28Feb2025_V002' / Version of HEADAS used
CALDBVER= 'gen20241115_xtd20241115_rsl20241115' / Version of CALDB used
DATE    = '2025-08-30T03:09:20' / Date and time this file was created or updated
SIB2_VER= 'V04.00  '           / SIB2 version JAXA

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