Observations of Omicron Andromedae. I - Radial velocities

Details Observations of Omicron Andromedae. I - Radial velocities Observations of Omicron Andromedae. I - Radial velocities

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pasp...90..732g&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 90, Dec. 1978-Jan. 1979, p. 732-738. Research supported by the National

Astronomy and Astrophysics

Astronomy

13

B Stars, Line Spectra, Radial Velocity, Stellar Envelopes, Stellar Spectra, Variable Stars, H Lines, Helium, Photographic Plates, Stellar Mass Ejection, Tables (Data)

Scientific paper

Radial velocities of the shell and stellar lines of Omicron And during the recent shell episode are presented. No large negative velocity shift was observed during this shell. Small-scale variations in the shell and stellar velocities were observed particularly during the early, active stage of the shell. These variations were on a time scale of days and were not periodic. The He I triplet lines are blueshifted with respect to the He I singlet lines. This may be due to stratification in the stellar atmosphere undergoing mass loss. The Mg II 4481-A line showed multiple, variable shell features throughout the shell development.

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