Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..260g&link_type=abstract
Astrophysical Journal, vol. 206, May 15, 1976, pt. 1, p. 260-264.
Astronomy and Astrophysics
Astrophysics
14
Binary Stars, Stellar Spectra, X Ray Sources, D Lines, Distance, Flux Density, Novae, O Stars, Stellar Luminosity
Scientific paper
Several spectra of the optical object identified with the X-ray flare source A0620-00 have been obtained at 5 A/mm with the Cassegrain echelle spectrograph on the 4-m Mayall telescope at Kitt Peak National Observatory. These spectra reveal no significant stellar lines, but the flux distribution in the range 4250-7400 A, dereddened for a color excess of 0.9 mag, is similar to that of an O star. The color excess, which is derived from the observed strength of the 5780-A diffuse interstellar band, and the velocities and strengths of the interstellar Na I D lines imply that the object is between 1.5 and 2.5 kpc from the sun. If a distance of 2 kpc is adopted, then the luminosity of the source in the observed wavelength region is roughly 5 by 10 to the 35th power erg/s. The possibility that this object is a slow nova is discussed.
Gull Ted R.
Henize Karl G.
Snow P. Jr. Th.
York Don G.
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