The semiregular variable 57 Pegasi

Details The semiregular variable 57 Pegasi The semiregular variable 57 Pegasi

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jrasc..80..230t&link_type=abstract

Journal of the Royal Astronomical Society of Canada (ISSN 0035-872X), vol. 80, Oct. 1986, p. 230-239. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

Astronomical Photometry, Emission Spectra, Periodic Variations, Semiregular Variable Stars, Astronomical Spectroscopy, Binary Stars, Radial Velocity

Scientific paper

Photometric and spectroscopic observations extending over a period of twelve years are presented. The changes of the shape and the amplitude of the light curves have been discussed. The data have been compared with the radial-velocity variations, however, no correlation has been found. On well-exposed spectrograms the emission cores of the Ca II H and K lines are present. The emission is double-peaked, separated by an absorption feature indicating the presence of an expanding chromosphere surrounded by a circumstellar envelope.

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