Other
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...333..565s&link_type=abstract
Astronomy and Astrophysics, v.333, p.565-570 (1998)
Other
9
Stars: Individual: Hd 68884= R 40(Smc), Stars: Variables: Other, Supergiants, Stars: Oscillations, Magellanic Clouds
Scientific paper
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 0.0008cd(-1) ( ~ 1300 d 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) 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. Based on observations obtained at the European Southern Observatory at La Silla, Chile (applications ESO 56D-0249 and 58D-0118)
de Groot Mart
Sterken Christiaan
van Genderen Arnout M.
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