EDP Sciences
Free Access
Volume 465, Number 2, April II 2007
Page(s) 593 - 601
Section Stellar atmospheres
DOI https://doi.org/10.1051/0004-6361:20066633
Published online 22 January 2007

A&A 465, 593-601 (2007)
DOI: 10.1051/0004-6361:20066633

A critical test of empirical mass loss formulas applied to individual giants and supergiants

K.-P. Schröder1, 2 and M. Cuntz3, 4

1  Departamento de Astronomía, A. P. 144, Universidad de Guanajuato, 36000 Guanajuato, GTO, Mexico
    e-mail: kps@astro.ugto.mx
2  Zentrum für Astronomie und Astrophysik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
3  Department of Physics, Science Hall, University of Texas at Arlington, Arlington, TX 76019-0059, USA
    e-mail: cuntz@uta.edu
4  Institut für Theoretische Astrophysik, Universität Heidelberg, Albert Überle Str. 2, 69120 Heidelberg, Germany

(Received 24 October 2006 / Accepted 10 January 2007)

To test our new, improved Reimers-type mass-loss relation, given by Schröder & Cuntz in 2005 (ApJ, 630, L73), we take a look at the best studied galactic giants and supergiants - particularly those with spatially resolved circumstellar shells and winds, obtained directly or by means of a companion acting as a probing light source. Together with well-known physical parameters, the selected stars provide the most powerful and critical observational venues for assessing the validity of parameterized mass-loss relations for cool winds not driven by molecules or dust. In this study, star by star, we compare our previously published relation with the original Reimers relation (1975, Mem. Roy. Soc. Liège 6. Ser. 8, 369), the Lamers relation (1981, ApJ, 245, 593), and the two relations by de Jager and his group (1988, A&AS, 72, 259; 1990, A&A, 231, 134). The input data, especially the stellar masses, have been constrained using detailed stellar evolution models. We find that only the relationship by Schröder & Cuntz agrees, within the error bars, with the observed mass-loss rates for all giants and supergiants.

Key words: methods: statistical -- stars: general -- stars: late-type -- stars: mass-loss -- stars: winds, outflows

© ESO 2007

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.