ETA_CARINAE
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.
obsid = 201037010 / Unique Observation/Sequence Number
object = ETA_CARINAE / Object name
pi_name = MAEDA YOSHITOMO / Proposal Principal Investigator Name
ra = 161.266656627641 / Right Ascension (Pointing Position) (deg)
dec = -59.6852201402521 / Declination (Pointing Position) (deg)
roll_angle = 0.00600610118608813 / Roll Angle (deg)
start_time = 2025-08-05T08:07:04 / Start Time of the Observation
stop_time = 2025-08-07T22:49:04 / Stop Time of the Observation
exposure = 101431.95785 / Effective Total Observation Exposure (s)
public_date= 2026-08-16 / Public Date