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26 April 2024 |
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On the distance of Magellanic Clouds: first overtone Cepheids | | G. Bono
; M.A.T. Groenewegen
; M. Marconi
; F. Caputo
; | | Date: |
6 Jun 2002 | | Subject: | astro-ph | | Affiliation: | INAF - Astron. Obs. of Roma), M.A.T. Groenewegen (Instituut voor Sterrenkunde, Heverlee, Belgium), M. Marconi (INAF - Astron. Obs. of Capodimonte), F. Caputo (INAF - Astron. Obs. of Roma | | Abstract: | We present a detailed comparison between predicted and empirical PL_{I,K} relations and Wesenheit function for Galactic and Magellanic Clouds (MCs) First Overtone (FO) Cepheids. We find that zero-points predicted by Galactic Cepheid models based on a noncanonical (mild overshooting) Mass-Luminosity (ML) relation are in very good agreement with empirical zero-points based on HIPPARCOS parallaxes, while those based on canonical (no overshooting) ML relation are about 0.2-0.3 mag brighter. We also find that predicted and empirical PL_K relation and Wesenheit function give, according to optical (V,I OGLE) and near-infrared (NIR, K, 2mass) data, mean distances to the MCs that agree at the 2% level. Individual distances to the Large and the Small Cloud are: 18.53+-0.08-19.04+-0.11 (theory) and 18.48+-0.13-19.01+-0.13 (empirical). Moreover, predicted and empirical FO relations do not present, within the errors, a metallicity dependence. Finaly, we find that the upper limit in the FO period distribution is a robust observable to constrain the accuracy of pulsation models. Current models agree within 0.1 in log P with the observed FO upper limits. | | Source: | arXiv, astro-ph/0206102 | | Services: | Forum | Review | PDF | Favorites | |
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