What is the isolated neutron star RX J1856-3754 trying to tell us?

Details What is the isolated neutron star RX J1856-3754 trying to tell us? What is the isolated neutron star RX J1856-3754 trying to tell us?

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprk11007w&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

The X-ray spectra of isolated neutron stars should, in principle, reveal the composition of the stellar atmosphere. In the case of a heavy element atmosphere, the absorption lines should reveal both the gravitational redshift (∝M/R) and the surface gravity (∝M/R^2). However, the 500 Ksec CHANDRA HRC/LETG spectrum of the nearest and brightest isolated neutron star RX J1856-3754 is devoid of features, and is well fit with a single temperature black body spectrum. We will present our latest analysis of this spectrum, with limits to possible absorption lines and edges. We will discuss model atmosphere fits to the spectrum. The extrapolation of the best fits to the X-ray spectrum are at odds with the optical/UV data, and we will attempt to reconcile these data. RX J1856-3754 still represents our best opportunity to determine the atmospheric composition and radius of a neutron star.

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