Light variations of massive stars (Alpha Cygni variables). X - The F type supergiants G266 = HDE271182 = R92 and G322 = HDE269612 in the LMC

Details Light variations of massive stars (Alpha Cygni variables). X - The F type supergiants G266 = HDE271182 = R92 and G322 = HDE269612 in the LMC Light variations of massive stars (Alpha Cygni variables). X - The F type supergiants G266 = HDE271182 = R92 and G322 = HDE269612 in the LMC

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26as...79..401v&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 79, no. 3, Sept. 1989, p. 401-406.

Astronomy and Astrophysics

Astrophysics

6

F Stars, Light Curve, Stellar Radiation, Stellar Spectrophotometry, Supergiant Stars, Magellanic Clouds, Stellar Color, Tables (Data), Variable Stars

Scientific paper

The results of VBLUW photometric observations of two massive variable stars in the LMC, the hypergiant G266 = HDE271182 = R92 (F8Ia/+/) and the supergiant G322 = HDE269612 (FoIa) are presented and compared to those for HD33486 star. Evidence is presented that indicates that these massive objects are no Cepheids, as was suggested by Grieve et al. (1985), but are Alpha Cyg variables. The highly unstable periods and light curves recorded for both variables suggest that the observed instability must be caused by a mechanism different from that acting in Cepheids. The progressive change of light amplitudes and quasi-periods for massive stars from the left-hand to the right-hand side of the HR diagram (Genderen, 1989) strongly suggests an evolutionary sequence from O-type to G-type supergiants.

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