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| Main Author: | |
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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad Nacional Autónoma de México
2012
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| Subjects: | |
| Online Access: | https://www.redalyc.org/articulo.oa?id=57124416008 |
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Table of Contents:
- AN APPROACH TO EFFECTIVE TEMPERATURE AND SURFACE GRAVITY IN POST-AGB AND RV TAURI STARS IN THE NEAR-IR REGION R. E. Molina Física, Astronomía y Matemáticas AGB stars: AGB and post Stars: fundamental parameters A number of empirical correlations that allow us to calculate the effective temperature and surface gravity for a set of evolved post-AGB and RV Tauri stars are determined using as calibrators the intrinsic colors of 2MASS (Two Micron All Sky Survey) photometry. We have analyzed a total sample of 36 stars of which 25 are post-AGB stars and 11 are RV Tauri stars, respectively. A group of 11 stars with parallax measures were used as calibrators of the absolute magnitude. The result for Teff and log g from intrinsic colors (J - H)0 and (H - Ks)0 at the near-infrared pass bands reach a dispersion of 220 K and 0.27, respectively. We can estimate the absolute magnitude using the intrinsic color in the near-infrared band with an uncertainty of 0.28 mag. This indicates that (J -H) 0 and (H -Ks)0 show sensitivity to the absolute magnitude. 2012 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57124416008 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.48