A precise position and optical identification for 4U 2129+47 - X-ray heating and a 5.2 hour binary period

Details A precise position and optical identification for 4U 2129+47 - X-ray heating and a 5.2 hour binary period A precise position and optical identification for 4U 2129+47 - X-ray heating and a 5.2 hour binary period

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233l..57t&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 233, Oct. 15, 1979, p. L57-L61.

Astronomy and Astrophysics

Astrophysics

55

Binary Stars, Radiant Heating, Variable Stars, X Ray Irradiation, X Ray Sources, X Ray Stars, Heao 1, Light Curve, Light Emission, Position (Location), Stellar Spectrophotometry

Scientific paper

A precise (20 arcsec) position and an optical counterpart are presented for the weak X-ray source 4U 2129+47. The optical counterpart shows weak but distinct He II 4686-A and C III-N III 4640-4650-A emission. Both H-beta and Ca II H and K are sometimes visible in absorption. Numerous plates and spectrophotometric observations from the 1978 observing season show that the blue magnitude varies from 16.7 to 18.0 in a period of 5.2382 hours. The light curve is sinusoidal in appearance, but with sharply defined V-shaped minima. It is proposed that most of the optical emission from this system originates at the X-ray heated face of the normal star and hence that this system is analogous to HZ Her/Her X-1. This is one of the few intrinsically faint optical counterparts of X-ray sources that show clear evidence of binary nature. The observations suggest a distance of 1.2-1.6 kpc for the source, and a consequent X-ray luminosity of approximately 10 to the 34.8 ergs/s.

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