Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978azh....55..765p&link_type=abstract
(Astronomicheskii Zhurnal, vol. 55, July-Aug. 1978, p. 765-775.) Soviet Astronomy, vol. 22, July-Aug. 1978, p. 438-444. Transla
Astronomy and Astrophysics
Astronomy
7
Auriga Constellation, Stellar Spectra, Stellar Structure, Astronomical Spectroscopy, Balmer Series, Black Holes (Astronomy), H Beta Line, Irregular Variable Stars
Scientific paper
Six spectrograms of the star KR Aur in the 3200-5500-A range have been obtained with 92-A/mm dispersion at the Observatoire de Haute Provence. The H-beta line profile for this irregular variable indicates that material is being accreted at a mean velocity of 3200 km/sec. A radial velocity of +130 km/sec is measured for the star. The Balmer lines show an exceptionally steep decrement: the number of the last visible line is 6.4. In wide-band filters the star exhibits 0.3% polarization. A law Fnu = const adequately fits the continuum. The peculiar light variation, the accretion phenomenon and its scale, the anomalously high radial velocity, the steep Balmer decrement, and the flat continuum suggest, taken together, that KR Aur may be a black hole.
Popova M. D.
Vitrichenko Eh. A.
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