4U1916-053
We propose a 50 ks observation of the high-inclination dipping low-mass X-ray binary (LMXB) 4U 1916 (minimal) and a 50 ks of the dipping LMXB 4U 1624 (ideal). We will characterise the absorbers throughout the orbit (column densities, degree of ionisation and velocity width and shift) and determine their density and location. We will use the changes in the absorbers' properties to model the complex spectral changes throughout the orbit, including during dips, and to trace the variability of the absorber associated with changes in the source luminosity and hardness. We will use this information to make a full map of the accretion disc and identify potential zones of wind launching in LMXBs, shielded regions in the disc or zones that attenuate the central emission such as hot coronae.
obsid = 300039010 / Unique Observation/Sequence Number
object = 4U1916-053 / Object name
pi_name = Collaboration XRISM / Proposal Principal Investigator Name
ra = 289.698378364738 / Right Ascension (Pointing Position) (deg)
dec = -5.23804815034198 / Declination (Pointing Position) (deg)
roll_angle = 79.973215614701 / Roll Angle (deg)
start_time = 2024-04-15T10:32:04 / Start Time of the Observation
stop_time = 2024-04-18T06:26:04 / Stop Time of the Observation
exposure = 113851.74651047 / Effective Total Observation Exposure (s)
public_date= 2025-08-31 / Public Date