XRISM XTEND observation 201113010

Title

ETA CARINAE: MINING THE IRON RANGE WITH XRISM

Abstract

We propose two XRISM observations of Eta Carinae, the closest most massive colliding wind binary during AO1, at a time when the two stars are approaching periastron passage and the X-ray flux is increasing. Our primary goal of measuring important changes in the iron K-line region in the Resolve spectra as the companion star moves towards superior conjunction. These observations will allow us to determine how much the shocked gas cools as the colliding wind shock moves into the acceleration zone of the companion star's wind; constrain the origin of the iron fluorescence line; constrain the Si/Fe ratio as an indicator of chemical abundance; and most importantly, determine the radial velocity shift of the Fe XXV line, which will provide our best measure of the mass of the companion star.

FITS header

TELESCOP= 'XRISM   '           / Mission name
INSTRUME= 'XTEND   '           / Instrument name
OBS_ID  = '201113010'          / Observation identification string
OBJECT  = 'ETA_CARINAE'        / Object name
OBSERVER= 'MICHAEL CORCORAN'   / PI name
OBS_MODE= 'POINTING'           / POINTING or SLEW or ALL
RA_OBJ  =             161.2648 / [deg] Object Right ascension
DEC_OBJ =             -59.6845 / [deg] Object Declination
RA_PNT  =     161.270240083783 / Pointing RA
DEC_PNT =    -59.6832251117812 / Pointing DEC
RA_NOM  =     161.266079516195 / [deg] Nominal aspect point R.A.
DEC_NOM =    -59.6847062716787 / [deg] Nominal aspect point Dec.
PA_NOM  =     285.001988416338 / [deg] Nominal aspect point roll.
TELAPSE =                60436 / Elapsed time
DATE-OBS= '2025-06-15T18:15:24' / Start date
DATE-END= '2025-06-16T11:02:40' / Stop date
ONTIME  =         29425.284707 / On-source time
EXPOSURE=         29425.284707 / 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    = '2025-07-14T13:00:47' / Date and time this file was created or updated
SIB2_VER= 'V03.01  '           / SIB2 version JAXA

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