Academic Journal
ATLAS vs. NextGen model atmospheres: a combined analysis of synthetic spectral energy distributions
العنوان: | ATLAS vs. NextGen model atmospheres: a combined analysis of synthetic spectral energy distributions |
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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 |
الوصف غير متاح. |