Discovery of an X-ray star association in VI Cygni /Cyg OB2/

Details Discovery of an X-ray star association in VI Cygni /Cyg OB2/ Discovery of an X-ray star association in VI Cygni /Cyg OB2/

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234l..51h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 234, Nov. 15, 1979, p. L51-L54. Research supported by the Science Re

Astronomy and Astrophysics

Astrophysics

205

Cygnus Constellation, Early Stars, X Ray Sources, X Ray Stars, Astrophysics, B Stars, O Stars, Stellar Luminosity

Scientific paper

A group of six X-ray sources located within 0.4 deg of Cygnus X-3 has been discovered with the Einstein Observatory. These sources have been positively identified and five of them correspond to stars in the heavily obscured OB association VI Cygni. The optical counterparts include four of the most luminous O stars within the field of view and a B5 supergiant. These sources are found to have typical X-ray luminosities of 5 x 10 to the 33rd ergs/s, with temperatures of 10 to the 6.8th K and hydrogen column densities of 10 to the 22nd/sq cm, and therefore comprise a new class of low-luminosity galactic X-ray sources associated with early-type stars.

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