The Strange Case of the X-Ray Binary 2129+47

Details The Strange Case of the X-Ray Binary 2129+47 The Strange Case of the X-Ray Binary 2129+47

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..678c&link_type=abstract

Astronomical Journal v.99, p.678

Astronomy and Astrophysics

Astronomy

15

X-Rays: Binaries

Scientific paper

Spectroscopic and photometric observations of 2129+47 in its extended quiescent state confirm the lack of measurable ellipsoidal and radial-velocity variations of the F8 IV star which now dominates the optical light. A possible, low-amplitude velocity change in Hβ absorption might indicate that the secondary star in the 5.2 hr binary still contributes slightly to the spectrum. The distance of the F8 IV star is found to be ˜6-8 kpc, making the x-ray source considerably more luminous than previously estimated, if it is at the same distance (i.e., a physical companion).

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