The Orbit of the Massive X-Ray Binary LS 5039

Details The Orbit of the Massive X-Ray Binary LS 5039 The Orbit of the Massive X-Ray Binary LS 5039

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...558l..43m&link_type=abstract

The Astrophysical Journal, Volume 558, Issue 1, pp. L43-L46.

Astronomy and Astrophysics

Astronomy

19

Stars: Binaries: Spectroscopic, Stars: Early-Type, Stars: Individual: Alphanumeric: Ls 5039, Stars: Individual: Alphanumeric: Rx J1826.2-1450, X-Rays: Binaries

Scientific paper

We present the first spectroscopic orbit for the massive X-ray binary LS 5039, which we find to be a short-period (P=4.117+/-0.011 days) and highly eccentric (e=0.41+/-0.05) system. The low-mass function for the orbit appears to be most consistent with a neutron star companion, although a black hole remains a possibility if the system has a low inclination. The spectrum of the O7 V optical star appears to be normal for its type (suggesting that there is little flux in the red from an accretion disk) except that the C IV λλ5801, 5812 lines are very weak, perhaps indicating the presence of CNO-processed gas in the O star. There is no evidence of Hα emission, so the system is probably not currently undergoing Roche lobe overflow. The projected rotational velocity, Vsini=131+/-6 km s-1, suggests that the optical star is rotating faster than synchronously with the orbit. The peculiar component of the systemic radial velocity is -17+/-3 km s-1, so the system is not a runaway star (at least not in this dimension).

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