Other
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99q.143r&link_type=abstract
Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.143
Other
Scientific paper
The type-C semiregular variables are M-type supergiants like Betelgeuse that undergo fairly regular periodic brightness fluctuations superposed upon seemingly irregular modulations. Most of the 55 recognized Milky Way supergiants belonging to the class are multi-periodic, with radial pulsation believed to be one source of their luminosity changes. Here we investigate the origin of the brightness variations in the SRC variable BC Cygni, which, as a member of the open cluster Berkeley 87, has a well-established reddening and distance. Simple interior models for the star are used in conjunction with adiabatic pulsation to investigate likely pulsation periods for the star, which seem to lie around 700 days. We also consider the possibility that some of the brightness modulations arise from the movement of starspots across the stellar surface through rotation or from a longer-term spot cycle. The main periodicities in BC Cyg are near 696 days (pulsation), 240- 350 days (rotation?), and ~3750 days (spot cycle?). We also present arguments for similar types of variations in other members of the SRC class.
Berdnikov Leonid N.
Pastukhova Elena N.
Rohanizadegan Mina
Turner David G.
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