Chandra HETG Observations of the Transient Pulsar 2S 1845-024

Details Chandra HETG Observations of the Transient Pulsar 2S 1845-024 Chandra HETG Observations of the Transient Pulsar 2S 1845-024

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002xrb..confe...8f&link_type=abstract

X-ray Binaries in the Chandra and XMM-Newton Era (with an emphasis on Targets of Opportunity), Abstracts of the conference held

Astronomy and Astrophysics

Astronomy

High Resolution X-Ray Spectroscopy, Plasma Diagnostics

Scientific paper

2S 1845-024 is a transient Be/X-ray pulsar in a highly eccentric orbit, that has outburst every periastron passage for at least the last decade. Previous X-ray observations have shown that the outburst light-curves have an unusual structure. They begin prior to periastron passage with a short spike, which lasts 1-2 days. The flux on the tail of the spike reaches a minimum near periastron passage, and then rapidly rises into a more prolonged outburst, lasting 30-40 days. The initial spike has been interpreted as direct wind accretion of material from the Be star's equatorial disk during the pulsar's passage through it. The following outburst has been interpreted as due to accretion from a disk around the pulsar formed from higher angular momentum material stripped from the Be star disk.
We have obtained four Chandra observations of this source near the outburst that occurred this September. The first, prior to the outburst, was made without gratings. This was followed by HETG observations during the initial spike, in the dip between the spike and main outburst, and during the main outburst. We present spectral analyses of these observations.

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