Predicting mass-loss events in R Coronae Borealis stars - Declines of V854 CEN

Details Predicting mass-loss events in R Coronae Borealis stars - Declines of V854 CEN Predicting mass-loss events in R Coronae Borealis stars - Declines of V854 CEN

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.256..339l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 256, no. 2, May 15, 1992, p. 339-348.

Astronomy and Astrophysics

Astronomy

44

R Coronae Borealis Stars, Stellar Mass Ejection, Stellar Oscillations, Variable Stars, Astronomical Photometry, Electrophotometers, Light Curve

Scientific paper

Consideration is given to photoelectric observations of the R Coronae Borealis (RCB) star V854 Cen, obtained during 1989-1991. These observations cover a number of declines of V854 Cen and allow the nature of these events for an individual RCB star to be studied. The time-gaps, between declines observed from 1987 to 1991, are integer multiples of 43.2 d, which is a periodicity identified as a likely pulsation mode of the star. The phase of the cycle at which the onset of the decline appears to occur is near that of maximum light. It is inferred that the declines of V854 Cen are induced by the pulsation of the star. The strong phase relationship between the pulsations and the declines suggests that the dust formation region is close to the star. The linking of the declines to a pulsation mode permits a degree of predictability for these events and indicates that mass-loss episodes in RCB stars do not occur on a purely random basis.

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