On the system V861 Sco, identified with OAO 1653-40

Details On the system V861 Sco, identified with OAO 1653-40 On the system V861 Sco, identified with OAO 1653-40

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....78..226t&link_type=abstract

Astronomy and Astrophysics, vol. 78, no. 2, Sept. 1979, p. 226-228.

Astronomy and Astrophysics

Astronomy

5

Binary Stars, Infrared Astronomy, Stellar Spectrophotometry, Variable Stars, X Ray Sources, Black Holes (Astronomy), Near Infrared Radiation, Stellar Luminosity, Stellar Mass Ejection, Stellar Models, Telescopes

Scientific paper

JHKLM near-IR photometry of the single-line spectroscopic binary V861 Sco, which has been identified with the variable X-ray source OAO 1653-40, is reported. Near-IR excesses of about 0.6 f.u. are found at 3.5 and 5 microns. A mass-loss rate of approximately 0.00001 solar mass/yr is derived, along with a distance of 1.7 kpc and an X-ray luminosity of about 10 to the 35th erg/s. For a primary mass of about 50 solar masses and an inclination of roughly 90 deg a secondary mass of approximately 10 solar masses and a component separation of about 64 solar radii are obtained. Two alternative models for the system are considered: one where the secondary star is a black hole and another where the secondary is not a collapsed object.

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