The limb-darkening for spherically symmetric NextGen model atmospheres: A-G main-sequence and sub-giant stars

Details The limb-darkening for spherically symmetric NextGen model atmospheres: A-G main-sequence and sub-giant stars The limb-darkening for spherically symmetric NextGen model atmospheres: A-G main-sequence and sub-giant stars

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...412..241c&link_type=abstract

Astronomy and Astrophysics, v.412, p.241-248 (2003)

Astronomy and Astrophysics

Astrophysics

40

Stars: Atmospheres, Stars: Binaries: Eclipsing

Scientific paper

We compute passband-integrated specific intensities for spherically symmetric models generated with the PHOENIX code. The models cover the range 5000 K <=Teff<=10 000 K with surface gravities between 3.5 and 5.5, in steps of 0.5. The adopted mixing-length parameter is 2.0 pressure scale heights, while the microturbulent velocity is 2.0 km s-1. The calculations were carried out for four photometric systems: Strömgren, Johnson, Geneva and Walraven, completing 24 filters. The series introduced by Claret (2000) and a new bi-parametric (exponential) law are shown to be able to describe the intensity distribution of spherical models with acceptable sigma . Simple limb-darkening laws do not produce accurate fits to the computed radiation fields. On the other hand, the concept of ``quasi'' spherical models is introduced and we present the corresponding limb-darkening coefficients for the most commonly adopted limb-darkening laws for the same filters.
Tables 2-17 are only available in electronic form at http://www.edpsciences.org

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