The Spectrum of β Lyrae.

Abstract

view Abstract Citations (48) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Spectrum of β Lyrae. Struve, Otto Abstract The system of j3 Lyrae consists of a normal B9 giant of lower luminosity than 13 Orionis. Those of its absorption lines which are not associated with emission lines from a nebula change little in intensity outside of eclipse. But those absorption lines which are associated with emission are weak and variable in intensity. The B5 absorption lines come from a nebula which has a condensation 29° after principal minimum. Dilution effects place the average distance of the nebula at about twice the radius of the B9 star from the latter's surface. The constancy of the normal B9 lines implies that the continuous absorption of the nebula has little effect upon the formation of these lines, and this is interpreted to mean that the nebula is a ring in the equatorial plane of the B9 star, not a complete shell. During principal eclipse the B9 star is eclipsed by a smaller star, so that the lines of the B9 star re- main visible. Satellites appear on the red side before central eclipse and on the violet side after central eclipse. These satellites show less dilution than does the B5 spectrum of the ring, and the outflowing stream corresponds to a hotter temperature than the inflowing stream. The violet satellites are interpreted as a stream flowing from the B9 star, along that side of the invisible second component which be- comes uncovered after minimum light. A part of the stream forms an expanding ring, while another part flows around the invisible component and returns to the B9 star, giving rise to the red satellites. The emission lines show a rotational vethcity of more than 300 km/sec, and their changes in structure and intensity agree with the proposed picture of i~ Lyrae Publication: The Astrophysical Journal Pub Date: January 1941 DOI: 10.1086/144249 Bibcode: 1941ApJ....93..104S full text sources ADS |