Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pazh...11..916v&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 11, Dec. 1985, p. 916-923) Soviet Astronomy Letters (ISSN 0360-0327), vol. 11, Nov.-Dec
Astronomy and Astrophysics
Astronomy
2
Binary Stars, Emission Spectra, Radiant Flux Density, Stellar Luminosity, Stellar Spectra, Absorption Spectra, Balmer Series, Metallicity, Orbital Elements, Radial Velocity, Spectral Line Width
Scientific paper
The spectrum of the PG 1550 + 191 binary system in its normal bright state and its low state is investigatged on 68 spectrograms taken with the 6-m telescope. In the normal state, apart from the emission lines typical of novalike stars, the spectrum exhibits numerous faint emission features of singly ionized metals and of Si, C, N, and O in ionization stages II-V. Another emission feature, at 4710 A, might represent an electron cyclotron line; it would then imply a 230-MG magnetic field. The radial-velocity curves derived from the peaks and from the bases of the line profiles are sinusoidal but differ in amplitude, gamma velocity, and extremum phase. Moreover the lines differ in their phase variation of equivalent width. In the low state, only weak Balmer lines remain, but broad asymmetric absorption and emission bands emerge with positions which do not match the earlier emission lines.
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