EF_ERI
Polars represent a distinct class of highly magnetized CVs. Measuring their white dwarf (WD) masses is crucial to understanding the origin of WD magnetic fields and the mass evolution of CVs. By fully characterizing Fe K-shell lines with Resolve, we will perform the most detailed X-ray spectroscopic study for two polars (AM Her and EF Eri): (1) robustly testing the conventional Fe line flux ratio diagnostics, (2) detecting non-equilibrium plasma with differing ion and electron temperatures near the shock region, (3) applying new methods of determining WD masses through measuring shock velocities and gravitational redshifts, and (4) constraining the accretion geometry. The proposed observations will demonstrate the unique capabilities of XRISM to probe the fundamental CV astrophysics.
obsid = 201086010 / Unique Observation/Sequence Number
object = EF_ERI / Object name
pi_name = MORI KAYA / Proposal Principal Investigator Name
ra = 48.5543788806188 / Right Ascension (Pointing Position) (deg)
dec = -22.5954576661526 / Declination (Pointing Position) (deg)
roll_angle = 58.1426044024016 / Roll Angle (deg)
start_time = 2025-07-11T11:16:04 / Start Time of the Observation
stop_time = 2025-07-12T18:25:04 / Stop Time of the Observation
exposure = 54637.984297 / Effective Total Observation Exposure (s)
public_date= 2026-07-23 / Public Date