Other
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.286..839l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 286, Issue 4, pp. 839-847.
Other
19
Stars: Carbon, Circumstellar Matter, Stars: Mass-Loss, Stars: Variables: Other
Scientific paper
The mean light of carbon-rich Mira variables varies on a time-scale of decades. The star becomes fainter and redder in all wavebands short of at least 4 mu, probably as the result of dust formation. The larger the amplitude of the secondary variations the redder the infrared colour. Re- examination of published material shows that M stars also vary in this way but are rarely observed to do so because these very long-period Miras (P>450 d) are very faint visually. The cycle-to-cycle variations in magnitude which are prominent in the light curves of M and S but not carbon Miras are attributed to variations in the strength of molecular bands which have much more effect on the visual magnitudes of M and S stars. Spectroscopic monitoring of four carbon-rich long-period variables for 10 years, during which V Hya and R Lep underwent major fading in visual light, shows that these episodes are accompanied by strong emission in the (0, 0) band at 5165 A in the Swan system of C_2. Differences between these dust fadings and those of the R Coronae Borealis stars are noted, and other models are considered.
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