The known optical counterparts of X-ray nova

Details The known optical counterparts of X-ray nova The known optical counterparts of X-ray nova

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....56..311c&link_type=abstract

Astronomy and Astrophysics, vol. 56, no. 1-2, Apr. 1977, p. 311-314. Research supported by the Consiglio Nazionale delle Ricerc

Astronomy and Astrophysics

Astrophysics

6

Binary Stars, Light Curve, Stellar Spectra, Variable Stars, X Ray Sources, Stellar Evolution, Stellar Luminosity, X Ray Stars

Scientific paper

Spectroscopic observations are presented for V616 Mon and HDE 245770, the proposed optical counterparts of the transient X-ray sources A0620-00 and A0535+26. The spectral evolution of the first object is incompatible with its designation as Nova Mon 1975 and suggests a model where the atmosphere of a late-type star is heated by X-radiation produced on a nearby collapsed object. The spectroscopic variations reported for the second star give further support to the identification of A0535+26 with this Be variable. Its higher luminosity remains practically unchanged during the X-ray outburst. The occurrence of X-nova phenomena in two classes of objects with different masses and luminosities is outlined.

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