An approach to effective temperature and surface gravity in post-AGB and RV Tauri stars at the near-IR region

2012/01/13 by R. E. Molina, Molina, R. E.
Physics and Astronomy · #Adaptive optics and wavefront sensing #Astronomy and Astrophysical Research #FOS: Physical sciences #Solar and Stellar Astrophysics (astro-ph.SR) #Stellar, planetary, and galactic studies #astro-ph.SR

paper · pdf · doi:10.48550/arxiv.1201.2884

To be published April 2012. 14 pages, 9 figures, 4 tables

arxiv created 2012/01/13 · openalex publication_date 2012/01/13 · arxiv updated 2012/01/16 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28

Abstract

A number of empirical correlations that allows us to calculate the effective temperature and surface gravity for a set evolved post-AGB and RV Tauri stars are determined using as calibrators the intrinsic colours of 2MASS (Two Micron All Sky Survey) photometry. We have analyzed a total sample of 36 stars where 25 are post-AGB stars and 11 are RV Tauri stars, respectively. A group of 11 stars with parallaxes measures were used as calibrators of the absolute magnitude. The result for T_{\rm eff} and log g from intrinsic colours (J-H)₀ and (H-K_s)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 colour in the near-infrared band with an uncertainty of 0.28 mag. This indicates that (J-H)₀ and (H-K_s)₀ show sensitivity to the absolute magnitude.

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