Mass-loss variations among carbon-rich AGB variables

Details Mass-loss variations among carbon-rich AGB variables Mass-loss variations among carbon-rich AGB variables

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.288..512w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 288, Issue 2, pp. 512-532.

Other

41

Stars: Agb And Post-Agb, Stars: Carbon, Stars: Late-Type, Stars: Mass-Loss, Stars: Variables: Other, Infrared: Stars

Scientific paper

Near-infrared light curves are presented for 11 large-amplitude carbon variables, covering time periods of 9 to 22yr. The light curves differ greatly among the various stars, although there is some degree of similarity among those with similar mass-loss characteristics. Three Miras with moderately thick dust shells, R For, R Lep and R Vol, exhibit large-amplitude (up to DeltaJ~2mag), erratic changes on top of their normal pulsational variations. The similarity between their light curves and those of R Coronae Borealis stars is noted. Evidence is presented that suggests that carbon-rich dust ejection occurs in a preferred direction, possibly from the equator. In the case of R Lep at least, the preferred direction coincides with the line of sight. Periodic variations of the dust shell, which have previously been suggested for R For, are not confirmed. Three Miras with very thin dust shells, V Cru, TT Cen and RV Cen, show rather little in the way of long-term trends. One of two thick-shelled sources, IZ Peg (CRL 3099), has a pulsation amplitude which has been gradually increasing over the last 16 years. The three semiregular variables, R Scl, GM CMa and IRAS 04067-0922, all show evidence of detached shells. Two of them also have double periods: GM CMa at twice the dominant pulsation period, and R Scl at approximately five times the dominant pulsation period.

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