Determination of mass-loss rates from early-type stars on the basis of 'log(W1)-log(W1 0)' diagrams

Details Determination of mass-loss rates from early-type stars on the basis of 'log(W1)-log(W1 0)' diagrams Determination of mass-loss rates from early-type stars on the basis of 'log(W1)-log(W1 0)' diagrams

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...127..304s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 127, no. 2, Nov. 1983, p. 304-308.

Astronomy and Astrophysics

Astrophysics

8

Early Stars, Logarithms, Mass Flow Rate, Radiative Transfer, Stellar Mass Ejection, Line Spectra, Opacity, Stellar Atmospheres, Stellar Models, Velocity Distribution

Scientific paper

Using realistic expressions for the velocity and opacity distributions in rapidly expanding atmospheres, the author presents numerical results for the first order moment W1 of a P Cygni line profile calculated as a function of the parameter W10 ∝ Mn(level), where Mrepresents the mass-loss rate and n(level) the average fractional abundance of the relevant ion. The calculations clearly show that the resulting "log(W1) - log(W10)" curves depend almost essentially on the opacity distribution and that for unsaturated P Cygni line profiles the relation W1 ∝ Mn(level) holds irrespective of the both distributions. For W1 ⪆ 0.24, the line profiles become saturated and the first order moment W1 does not provide anymore accurate information on the mass-loss rate. This technique of mass-loss determination and that which consists in fitting observed line profiles with theoretical ones are compared.

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