MAPPING WIND MASS LOSS IN A NEUTRON STAR HOSTING BINARY WITH X-RAYS
Binary evolution is a fundamental ingredient in astronomy. For NS-hosting HMXBs, which are of particular interests for the most plausible NS-NS merger progenitors, the standard binary evolution theory meets some serious challenges. One thing that is not considered well in the standard theory is the non-isotropy of the wind mass loss from the high-mass donor. Doppler tomography is an established method in the optical/UV band for the velocity mapping of a binary system, which can be applied in the X-ray band for the first time by using Resolve. Cen X-3 is the target of choice. The wind velocity field can be mapped using photo-ionized X-ray emission lines. Here, we propose a Resolve observation for one entire orbit (2.1 days) to construct a phase-resolved high-resolution X-ray spectra.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'XTEND ' / Instrument name OBS_ID = '300003010' / Observation identification string OBJECT = 'Cen_X-3 ' / Object name OBSERVER= 'XRISM Collaboration' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 170.31287 / [deg] Object Right ascension DEC_OBJ = -60.62378 / [deg] Object Declination RA_PNT = 170.290945955385 / Pointing RA DEC_PNT = -60.6138912376983 / Pointing DEC RA_NOM = 170.312690821294 / [deg] Nominal aspect point R.A. DEC_NOM = -60.6238905321248 / [deg] Nominal aspect point Dec. PA_NOM = 156.799817724664 / [deg] Nominal aspect point roll. TELAPSE = 195023.765625 / Elapsed time DATE-OBS= '2024-02-13T00:07:26.234375' / Start date DATE-END= '2024-02-15T06:17:50' / Stop date ONTIME = 148953.60348 / On-source time EXPOSURE= 148953.60348 / Exposure time PROCVER = '03.00.013.009' / Processing script version MKFFF = 'ISAS/JAXA' / Origin of First FITS file ORIGIN = 'GSFC/NASA' / Origin of Processed FITS file SOFTVER = 'Hea_21Aug2024_V6.34_XRISM_21Aug2024_V001' / Version of HEADAS used CALDBVER= 'gen20240315_xtd20240815_rsl20240815' / Version of CALDB used DATE = '2024-09-22T13:44:12' / Date and time this file was created or updated SIB2_VER= / SIB2 version JAXA