Observations of Omicron Andromedae. II - Spectrum variations

Details Observations of Omicron Andromedae. II - Spectrum variations Observations of Omicron Andromedae. II - Spectrum variations

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92..774g&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 92, Dec. 1980-Jan. 1981, p. 774-781. Research supported by the National

Astronomy and Astrophysics

Astronomy

19

Andromeda Galaxy, B Stars, Line Spectra, Stellar Spectrophotometry, H Lines, Magnesium, Periodic Variations, Stellar Mass

Scientific paper

Spectrophotometry of the recent shell episode of Omicron And is reported. A summary of past shell outbursts is given. The present shell appeared in 1973, reached a maximum in 1975, and disappeared in 1978. Shell lines weakened steadily from 1975 to 1978 except for a temporary strengthening in late 1976 and early 1977. The metallic-shell lines disappeared first, followed by the hydrogen-shell lines. Rapid variations were present near shell maximum. These differed systematically among different groups of lines. The complex nature and behavior of Mg II 4481 A is discussed. A weak narrow feature in this line still remains. No periodic variability was detected.

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