SIMBAD references

1998A&A...333..565S - Astronomy and Astrophysics, volume 333, 565-570 (1998/5-2)

Cyclicities in the light variations of Luminous Blue Variables. II. R40 developing an S Doradus phase.

STERKEN C., DE GROOT M. and VAN GENDEREN A.M.

Abstract (from CDS):

Stroemgren differential photometry of R40 collected during the time interval 1986-1996 is analysed together with Walraven photometry. The gradual brightening of the star over the last 10 years can be described by a linear trend with superimposed oscillations (in v, b and y) with frequency 0.0008c/d (∼1300d cycle). We interpret these oscillations as ``normal S Dor'' phases, and suggest that the quasi-linear brightening of the star is the ascending branch of a growing very-long-term S Dor phase (VLT-SD), as found by van Genderen et al. (1997A&A...318...81V) in AG Car and S Dor itself. As R40 is now becoming fainter and bluer, the length of the VLT-SD cycle is about 20 years.

Abstract Copyright:

Journal keyword(s): stars: individual: HD 68884 = R 40(SMC) - stars: variables: other - supergiants - stars: oscillations - Magellanic Clouds

Simbad objects: 6

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2021.04.18-11:58:28

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