ETA_CARINAE
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.
obsid = 201113010 / Unique Observation/Sequence Number
object = ETA_CARINAE / Object name
pi_name = CORCORAN MICHAEL / Proposal Principal Investigator Name
ra = 161.266079516195 / Right Ascension (Pointing Position) (deg)
dec = -59.6847062716787 / Declination (Pointing Position) (deg)
roll_angle = 285.001988416338 / Roll Angle (deg)
start_time = 2025-06-15T17:39:04 / Start Time of the Observation
stop_time = 2025-06-16T11:33:04 / Stop Time of the Observation
exposure = 31334.13291 / Effective Total Observation Exposure (s)
public_date= 2026-06-25 / Public Date