XRISM XTEND observation 201086010

Title

COMPLETE HIGH-RESOLUTION FE LINE DIAGNOSTICS OF POLARS WITH XRISM

Abstract

Polars represent a distinct class of highly magnetized CVs. Measuring their white dwarf (WD) masses is crucial to understanding the origin of WD magnetic fields and the mass evolution of CVs. By fully characterizing Fe K-shell lines with Resolve, we will perform the most detailed X-ray spectroscopic study for two polars (AM Her and EF Eri): (1) robustly testing the conventional Fe line flux ratio diagnostics, (2) detecting non-equilibrium plasma with differing ion and electron temperatures near the shock region, (3) applying new methods of determining WD masses through measuring shock velocities and gravitational redshifts, and (4) constraining the accretion geometry. The proposed observations will demonstrate the unique capabilities of XRISM to probe the fundamental CV astrophysics.

FITS header

TELESCOP= 'XRISM   '           / Mission name
INSTRUME= 'XTEND   '           / Instrument name
OBS_ID  = '201086010'          / Observation identification string
OBJECT  = 'EF_ERI  '           / Object name
OBSERVER= 'KAYA MORI'          / PI name
OBS_MODE= 'POINTING'           / POINTING or SLEW or ALL
RA_OBJ  =              48.5552 / [deg] Object Right ascension
DEC_OBJ =             -22.5953 / [deg] Object Declination
RA_PNT  =      48.553993970196 / Pointing RA
DEC_PNT =    -22.5980028741922 / Pointing DEC
RA_NOM  =     48.5543788806188 / [deg] Nominal aspect point R.A.
DEC_NOM =    -22.5954576661526 / [deg] Nominal aspect point Dec.
PA_NOM  =     58.1426044024016 / [deg] Nominal aspect point roll.
TELAPSE =               105878 / Elapsed time
DATE-OBS= '2025-07-11T12:24:41' / Start date
DATE-END= '2025-07-12T17:49:19' / Stop date
ONTIME  =         51022.523295 / On-source time
EXPOSURE=         51022.523295 / 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    = '2025-07-18T02:52:52' / Date and time this file was created or updated
SIB2_VER= 'V04.00  '           / SIB2 version JAXA

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