Spectrographic observations of Omicron Andromedae from 1967 to 1976

Details Spectrographic observations of Omicron Andromedae from 1967 to 1976 Spectrographic observations of Omicron Andromedae from 1967 to 1976

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..49..145f&link_type=abstract

Astrophysics and Space Science, vol. 49, no. 1, June 1977, p. 145-167. Research supported by the Consiglio Nazionale delle Rice

Astronomy and Astrophysics

Astrophysics

20

Binary Stars, Radial Velocity, Spectrum Analysis, Stellar Envelopes, Stellar Spectra, Stellar Spectrophotometry, Correlation, Periodic Variations, Qualitative Analysis, Stellar Luminosity

Scientific paper

Results are presented for a qualitative analysis of spectra of the Be variable Omicron And obtained in the period from 1968 to 1976, radial-velocity determinations for the interval from 1967 to 1976, a survey of periods derived from UBV and JHK photometric measures, and a periodogram analysis. It is found that the Balmer-line absorption cores exhibited conspicuous variations, intensity variations occurred in metallic lines, a shell spectrum appeared in July 1975, and the intensities of the shell features were sometimes variable on a time scale of one day. The wide range of radial velocities measured from stellar and shell hydrogen and metallic lines seems to indicate temperature or electron-pressure changes in photospheric layers, oscillatory motions of a thin shell prior to the reappearance of the main shell, envelope ejection, and a possible correlation between brightness variations and mass motions. It is noted that no periodic behavior was revealed by analysis of radial velocity as a function of phase, but a period of 1.5845 days was obtained from this analysis.

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