期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 375, 期 1, 页码 301-306出版社
BLACKWELL PUBLISHING
DOI: 10.1111/j.1365-2966.2006.11299.x
关键词
stars : AGB and post-AGB; stars : carbon; stars : mass-loss; stars : oscillations; stars : variables : other
Decline onset times were measured in long-term visual light curves for five R Coronae Borealis (RCB) variable stars. These included RY Sgr and V854 Cen, the two RCB stars previously reported to have a relationship between dust formation events and pulsational variations. Analysis of the decline epochs showed that all decline onsets for a given star obey a linear ephemeris tied to the object's dominant radial pulsation period. Thus, in addition to confirming the pulsation-decline correlation for RY Sgr and V854 Cen, this same behaviour was demonstrated in UW Cen, R CrB and S Aps for the first time. This general result firmly establishes the connection between radial pulsation and mass loss in the RCB stars. The dominant pulsation period of approximate to 40 d for all of these objects therefore represents the characteristic time-scale on which these stars produce dust.
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