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2007MNRAS.376..313G - Mon. Not. R. Astron. Soc., 376, 313-337 (2007/March-3)
Luminosities and mass-loss rates of carbon stars in the Magellanic Clouds.
GROENEWEGEN M.A.T., WOOD P.R., SLOAN G.C., BLOMMAERT J.A.D.L., CIONI M.-R.L., FEAST M.W., HONY S., MATSUURA M., MENZIES J.W., OLIVIER E.A., VANHOLLEBEKE E., VAN LOON J.Th., WHITELOCK P.A., ZIJLSTRA A.A., HABING H.J. and LAGADEC E.
Abstract (from CDS):
There is significant scatter in a diagram where the mass-loss rates are plotted against luminosity, and this is partly due to the fact that the luminosities are derived from single-epoch data. The mass-loss rates for the MC objects roughly scatter around the mean relation for Galactic C-stars.
The situation is better defined when the mass-loss rate is plotted against pulsation period. For a given period, most of the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC) stars have mass-loss rates that are in agreement with that observed in Galactic carbon stars (under the assumption that these objects have an expansion velocity and dust-to-gas ratio typical of the mean observed in Galactic carbon Miras).
For some SMC sources only, the IRS spectrum at longer wavelengths falls clearly below the model flux predicted by a constant mass-loss rate. An alternative model with a substantial increase of the mass-loss rate to its present-day value over a time-scale of a few tens of years is able to explain the spectral energy distribution (SED) and IRS spectra of these sources. However, the probability to have two such cases in a sample of 60 is small, and makes this not a likely explanation (and testable by re-observing these objects near the end of the lifetime of Spitzer). Alternative explanations are (ad hoc) changes to the dust emissivity at longer wavelengths, and/or deviations from spherical symmetry.
Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s): circumstellar matter - stars: AGB and post-AGB - stars: mass-loss - Magellanic Clouds - infrared: stars
VizieR on-line data: <Available at CDS (J/MNRAS/376/313): table1.dat table2.dat>
Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.
Simbad objects: 6
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