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2005A&A...438..273V - Astronomy and Astrophysics, volume 438, 273-289 (2005/7-4)

An empirical formula for the mass-loss rates of dust-enshrouded red supergiants and oxygen-rich Asymptotic Giant Branch stars.

VAN LOON J.T., CIONI M.-R.L., ZIJLSTRA A.A. and LOUP C.

Abstract (from CDS):

We present an empirical determination of the mass-loss rate as a function of stellar luminosity and effective temperature, for oxygen-rich dust-enshrouded Asymptotic Giant Branch stars and red supergiants. To this aim we obtained optical spectra of a sample of dust-enshrouded red giants in the Large Magellanic Cloud, which we complemented with spectroscopic and infrared photometric data from the literature. Two of these turned out to be hot emission-line stars, of which one is a definite B[e] star. The mass-loss rates were measured through modelling of the spectral energy distributions. We thus obtain the mass-loss rate formula log{dot}(M)=-5.65+1.05log(L/10000L)-6.3log(Teff/3500K), valid for dust-enshrouded red supergiants and oxygen-rich AGB stars. Despite the low metallicity of the LMC, both AGB stars and red supergiants are found at late spectral types. A comparison with galactic AGB stars and red supergiants shows excellent agreement between the mass-loss rate as predicted by our formula and that derived from the 60µm flux density for dust-enshrouded objects, but not for optically bright objects. We discuss the possible implications of this for the mass-loss mechanism.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: carbon - stars: mass-loss - supergiants - Magellanic Clouds - infrared: stars

Simbad objects: 96

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2019.11.17-19:59:31

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