Academic Journal

ATLAS vs. NextGen model atmospheres: a combined analysis of synthetic spectral energy distributions

التفاصيل البيبلوغرافية
العنوان: ATLAS vs. NextGen model atmospheres: a combined analysis of synthetic spectral energy distributions
المؤلفون: E. Bertone, A. Buzzoni, M. Chavez, L. H. Rodriguez-merino
المساهمون: The Pennsylvania State University CiteSeerX Archives
المصدر: http://arxiv.org/pdf/astro-ph/0406215v1.pdf.
سنة النشر: 2004
المجموعة: CiteSeerX
الوصف: We carried out a critical appraisal of the two theoretical models, Kurucz ’ ATLAS9 and PHOENIX/NextGen, for stellar atmosphere synthesis. Our tests relied on the theoretical fit of spectral energy distributions (SED) for a sample of 334 target stars along the whole spectraltype sequence, from the classical optical catalogs of Gunn & Stryker (1983) and Jacoby et al. (1984). The best-fitting physical parameters (Teff, log g) of stars allowed an independent calibration of the temperature and bolometric scale vs. empirical classification parameters (i.e. spectral type and MK luminosity class); in addition, the comparison of the synthetic templates from the ATLAS and NextGen grids allowed us to probe the capability of the models to match spectrophotometric properties of real stars and assess the impact of the different input physics. We can sketch the following main conclusions of our analysis: i) fitting accuracy of both theoretical libraries drastically degrades at low Teff, where both ATLAS and NextGen models still fail to properly account for the contribution of molecular features in the observed SED of K-M stars. ii) Comparing with empirical calibrations, both ATLAS and NextGen fits tend, in average
نوع الوثيقة: text
وصف الملف: application/pdf
اللغة: English
Relation: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.315.3293; http://arxiv.org/pdf/astro-ph/0406215v1.pdf
الاتاحة: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.315.3293
http://arxiv.org/pdf/astro-ph/0406215v1.pdf
Rights: Metadata may be used without restrictions as long as the oai identifier remains attached to it.
رقم الانضمام: edsbas.8E8BE471
قاعدة البيانات: BASE