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

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

2010-07-05

arxiv.org/abs/1007.0771v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

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

Scientific paper

From photoelectric $uvby\beta$ 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 $\Delta [c_1]$ index with an uncertainty of about 0.26 dex. Although a clear and significant trend between $M_V$ and $\Delta [c_1]$ is seen, no calibration is found that predicts accurate values of $M_V$.

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