Functional relationships for T_\rm eff and log~g in F-G supergiants from uvbyβ photometry

2010/07/05 by A. Arellano Ferro, Ferro, A. Arellano
Physics and Astronomy · #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies #astro-ph.SR

paper · pdf · doi:10.48550/arxiv.1007.0771

To be published Octuber 2010. 8 pages, 7 figures, 2 tables

arxiv created 2010/07/05 · arxiv updated 2010/07/07

Abstract

From photoelectric uvbyβ data and recent accurate synthetic and spectroscopic values of T_{\rm eff} and log~g for 50 F-G supergiants, we have calculated functional relationships that lead to initial estimates of effective temperature and gravities for these types of stars. It is shown that while the T_{\rm eff} relationships are calculated using the data on young massive supergiants, they are also valid for evolved stars of similar temperatures like post-AGB and RV Tau stars. The gravity can also be predicted from the Δ[c₁] index with an uncertainty of about 0.26 dex. Although a clear and significant trend between M_V and Δ[c₁] is seen, no calibration is found that predicts accurate values of M_V.

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