The Spectrum of W Serpentis.

Abstract

view Abstract Citations (6) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Spectrum of W Serpentis. Bauer, Carl August Abstract The radial velocities and spectral variations of W Serpentis were determined from 31 spectrograms taken at the McDonald Observatory in 1943. All absorption lines give similar velocity-curves, with the exception of Ca ii K, which may be blended with an interstellar component. The velocity-curves give -y = -10 km/sec, K = 28 km/sec, and P = 14.153 days. The minimum of radial velocity occurs about one day after minimum light, instead of several days later. The conclusion is that the velocity-curve does not represent the motion of the brighter component of the binary but is probably a picture of complicated motions within an extended shell surrounding the system. All spectral lines vary with the phase. The hydrogen emission lines have strong red components at minimum light and strong violet components in the vicinity of phase 5 days. The absorption lines at maximum light suggest a composite character con- taining A-type features together with features of class G. However, all features originate in the same source and cannot be attributed to two different stars. Lines of Fe u, [Fe ii], Tin, Ci ii, and other ele- ments occur in emission at minimum light. The absorption lines of Fe i are relatively strong at minimum and are unsymmetrical, changing in character at zero phase. Some lines of Ti U and certain other ab- sorption features become broad and diffuse at principal minimum Publication: The Astrophysical Journal Pub Date: March 1945 DOI: 10.1086/144705 Bibcode: 1945ApJ...101..208B full text sources ADS |