Statistics – Computation
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231..134n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 1, May 1990, p. 134-136.
Statistics
Computation
186
Hertzsprung-Russell Diagram, Stellar Luminosity, Stellar Mass Ejection, Computational Astrophysics, Stellar Atmospheres, Stellar Models, Stars: Atmospheres Of, Stars: Mass Of, Stars: Mass Loss
Scientific paper
We investigate the dependence of Mṡ on the three fundamental parameters mass M, radius R and luminosity L for a sample of 247 stars (number of independent data points with weight unity =454). "Average expected" mass-values are derived from evolutionary calculations. A simple formula, viz.
-Mṡ=9.6310-15 (L/Lsun)1.42 (M/Msun)0.16 (R/Rsun)0.81 Msun Msun yr-1
appears to give a good representation of observed rates of mass loss over the whole Hertzsprung-Russell diagram. For luminous stars with Teff > 5000 K the standard deviation is equal to the intrinsic error (0.37) of the rate of mass loss. The representation is comparable to or even better than that of the expressions by Reimers and Lamers, which were derived for restricted areas of the HR-diagram.
de Jager Cornelis
Nieuwenhuijzen Hans
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