On the use of CA I triplet lines as luminosity indicators.

Details On the use of CA I triplet lines as luminosity indicators. On the use of CA I triplet lines as luminosity indicators.

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...312..549c&link_type=abstract

Astronomy and Astrophysics, v.312, p.549-552

Astronomy and Astrophysics

Astrophysics

15

Stars: Atmospheres, Fundamental Parameters

Scientific paper

Many strong lines formed in stellar atmospheres are well known to be dominated by pressure broadening, therefore their wings are a precious help for determining the surface gravities of dwarf or subgiant stars. In this paper, we explore the possibility for using the wings of the Ca I triplet lines 6102, 6122, 6162A for which recent theoretical computations of the damping are available. A NLTE code for radiative transfer was used to check these new computations against the integrated Solar Spectrum. We report here that (i) there is a spectacular improvement in the fit of the computed profile with the observed one when the new quantum mechanical computations are used instead of the classical Unsoeld's expression of the Van der Waals damping constant (ii) the departures from LTE in the computation of the wings of these lines are negligible, and this justifies the use of LTE computations for the determination of the surface gravities of G type stars, by this method.

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