Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....65..363b&link_type=abstract
Astronomy and Astrophysics, vol. 65, no. 3, May 1978, p. 363-367.
Astronomy and Astrophysics
Astrophysics
38
Periodic Variations, Stellar Spectrophotometry, Supergiant Stars, Variable Stars, A Stars, Amplitude Distribution Analysis, Autocorrelation, B Stars, Light Curve, Spectral Emission, Stellar Luminosity, Velocity Distribution
Scientific paper
The photometric observations of seven B2 to G0 Ia-type supergiants in the Geneva system are analyzed. All stars are found to be semi-periodic variables. The peak-to-peak amplitude of variation is about 1.5 times larger for the four B2 to A2 supergiants (about 0.06 min in msubv) than for the three A5 to G0 supergiants. A method of auto-correlation is used to determine the semi-period of variation P, and the accuracy of these determinations is in most cases very good. The P-value increases from 15-20 days for the B supergiants to more than 80 days for the G0 Ia star. This fact confirms the dependence on the spectral type of the semi-period-luminosity relation for the supergiant stars.
Burki Gilbert
Maeder Andre
Rufener F.
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