Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26as...75..139b&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 75, no. 1, Oct. 1988, p. 139-150.
Astronomy and Astrophysics
Astrophysics
12
B Stars, Line Spectra, Radial Velocity, Stellar Evolution, Balmer Series, Emission Spectra, Harmonic Analysis, Metallicity, Stellar Envelopes
Scientific paper
A study of radial velocities (RVs) of the shell lines of Pleione, one of the most typical late Be stars presenting alternatively B and Be phases, is presented for the years 1978 to 1987. Large variations are observed in RVs of Balmer and metallic lines, as well as in the number of observable lines in Balmer series. These lines gradually disappear in 1985 and later, and the general behavior of the star is almost exactly the same as pointed out by Merrill in the early 1950s. Harmonic analysis of shell line RVs until their disappearance in 1985 gives a period of about 136 days, roughly equal to the value calculated by Struve and Swings between 1938 and 1943. The observations fit well with Underhill's (1949) model for the shell of Pleione.
Ballereau Dominique
Chauville Jacques
Mekkas A.
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