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Title:
Discovery of an X-ray star association in VI Cygni /Cyg OB2/
Authors:
Harnden, F. R., Jr.; Branduardi, G.; Elvis, M.; Gorenstein, P.; Grindlay, J.; Pye, J. P.; Rosner, R.; Topka, K.; Vaiana, G. S.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AD(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AE(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AF(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AG(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass; Leicester, University, Leicester, England), AH(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass; Leicester, University, Leicester, England), AI(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass; Palermo, Osservatorio Astronomico, Palermo, Italy)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 234, Nov. 15, 1979, p. L51-L54. Research supported by the Science Research Council of England, Smithsonian Institution, Consiglio Nazionale delle Ricerche, and CRRN; (ApJL Homepage)
Publication Date:
11/1979
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Cygnus Constellation, Early Stars, X Ray Sources, X Ray Stars, Astrophysics, B Stars, O Stars, Stellar Luminosity
DOI:
10.1086/183107
Bibliographic Code:
1979ApJ...234L..51H

Abstract

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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