XRISM XTEND observation 201037010

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Title

XRISM PIERCING THE DENSE STELLAR WIND OF LUMINOUS BLUE VARIABLE IN ETA CARINAE

Abstract

Mass-loss is widely recognized as a key parameter to understand a stellar chemical evolution following supernova. However, a mass loss rate of Luminous Blue Variables (LBVs) are very difficult to measure due to their dense wind and understood only with digit precision of 10^-3 Mo / yr. In order to improve this accuracy, we propose to observe Eta Carinae at around the periastron passage. Eta Carinae is a long period binary of a primary LBV star and a secondary WR or O star with 5.5 yr period. During the periastron passage, the X-ray plasma heated by wind-wind collision becomes compact, the X-rays from which pierces the LBV wind with narrow beam size. Using the Fe-K absorption edge, the narrow beam enables promising us to pursue to measure the mass-loss rate of the LBV.

FITS header

TELESCOP= 'XRISM   '           / Mission name
INSTRUME= 'XTEND   '           / Instrument name
OBS_ID  = '201037010'          / Observation identification string
OBJECT  = 'ETA_CARINAE'        / Object name
OBSERVER= 'YOSHITOMO MAEDA'    / 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  =     161.270567815501 / Pointing RA
DEC_PNT =    -59.6868654964125 / Pointing DEC
RA_NOM  =     161.266656627641 / [deg] Nominal aspect point R.A.
DEC_NOM =    -59.6852201402521 / [deg] Nominal aspect point Dec.
PA_NOM  =  0.00600610118608813 / [deg] Nominal aspect point roll.
TELAPSE =               220431 / Elapsed time
DATE-OBS= '2025-08-05T09:14:24' / Start date
DATE-END= '2025-08-07T22:28:15' / Stop date
ONTIME  =         85979.456433 / On-source time
EXPOSURE=         85979.456433 / 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    = '2025-08-15T09:01:46' / Date and time this file was created or updated
SIB2_VER= 'V04.00  '           / SIB2 version JAXA

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