Spectral and photometric observations of fast irregular variable stars. I - BN ORI

Details Spectral and photometric observations of fast irregular variable stars. I - BN ORI Spectral and photometric observations of fast irregular variable stars. I - BN ORI

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976afz....12...31k&link_type=abstract

Astrofizika, vol. 12, Feb. 1976, p. 31-44. In Russian.

Astronomy and Astrophysics

Astronomy

3

H Lines, Irregular Variable Stars, Stellar Luminosity, Stellar Spectrophotometry, Ubv Spectra, Variable Stars, Brightness, H Alpha Line, H Beta Line, Stellar Spectra

Scientific paper

Results are presented for a study of the irregular variable BN Ori, which utilized photoelectric UBV brightness measurements, spectral observations of the H-alpha and H-beta lines, and photoelectric spectral traces in the region from 3000 to 6000 A. The UBV observations show that the stellar brightness is nearly constant, and the star is classified as F2 on the basis of the photoelectric spectral traces. The absolute continuum-energy distribution in the region from 3000 to 6000 A is found to agree well with that of a standard F2 V star between 4000 and 6000 A, but to indicate a UV excess between 3000 and 3500 A. Variable H-alpha emission is observed, and IR color indices reveal an IR excess. It is suggested that the UV excess and H-alpha emission result from hydrogen recombination radiation in the presence of self-absorption in the H-alpha line, that free-free emission contributes little to the IR excess, and that the main component of the IR excess consists of thermal reradiation from a circumstellar dust envelope with a temperature of about 1500 K.

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