XRISM XTEND observation 201038010

Quick-look products

Xtend spectrum

p0300: All four CCDs in full window mode

p0300: All four CCDs in full window mode

Xtend light curve

Light curve

Light curve

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  = '201038010'          / 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  =      161.26766048492 / Pointing RA
DEC_PNT =    -59.6866023503669 / Pointing DEC
RA_NOM  =     161.263749622063 / [deg] Nominal aspect point R.A.
DEC_NOM =    -59.6849568160138 / [deg] Nominal aspect point Dec.
PA_NOM  =    0.011177905879876 / [deg] Nominal aspect point roll.
TELAPSE =               182802 / Elapsed time
DATE-OBS= '2025-08-25T15:23:08' / Start date
DATE-END= '2025-08-27T18:09:50' / Stop date
ONTIME  =         115973.46959 / On-source time
EXPOSURE=         115973.46959 / 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    = '2025-09-04T10:15:53' / Date and time this file was created or updated
SIB2_VER= 'V04.00  '           / SIB2 version JAXA

Links