2S 0918-549 - Optical identification and study of a new distant low-mass X-ray binary

Details 2S 0918-549 - Optical identification and study of a new distant low-mass X-ray binary 2S 0918-549 - Optical identification and study of a new distant low-mass X-ray binary

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...172..167c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 172, no. 1-2, Jan. 1987, p. 167-172.

Astronomy and Astrophysics

Astrophysics

11

Stellar Mass, Stellar Spectrophotometry, Visible Spectrum, X Ray Binaries, X Ray Sources, Charge Coupled Devices, Heao 2, Interstellar Extinction, Stellar Luminosity, Ubv Spectra

Scientific paper

The optical counterpart of the X-ray source 2S 0918-549 has been identified on CCD images obtained with the ESO 2.2 m telescope. The object is the only ultraviolet-bright star in the Einstein HRI error circle. Its colors (V = 21.0, B-V = 0.3, U-B = -0.9) and X-ray-to-optical luminosity ratio (Lx/Lopt ≈ 800) are consistent with a slightly reddened low-mass X-binary (LMXB). If located within 15 kpc of the sun, it appears underluminous with respect to other LMXBs. The object does not vary in optical brightness by more than 7% (1σ) over time scales ranging from less than one hour to a year.

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