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- W2124818319 abstract "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 μm, 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 Å in the Swan system of C2. Differences between these dust fadings and those of the R Coronae Borealis stars are noted, and other models are considered." @default.
- W2124818319 created "2016-06-24" @default.
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- W2124818319 date "1997-04-21" @default.
- W2124818319 modified "2023-10-17" @default.
- W2124818319 title "Spectroscopic changes and the variable mean light of carbon stars" @default.
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- W2124818319 doi "https://doi.org/10.1093/mnras/286.4.839" @default.
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