Towards the absolute planes: a new calibration of the bolometric corrections and temperature scales for Population II giants |
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| Authors: | P Montegriffo F R Ferraro L Origlia & F Fusi Pecci |
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| Institution: | Osservatorio Astronomico di Bologna, Via Zamboni 33, 40126 Bologna, Italy,;Stazione Astronomica, 09012 Capoterra, Cagliari, Italy |
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| Abstract: | We present new determinations of bolometric corrections and effective temperature scales as a function of infrared optical colours, using a large data base of photometric observations of about 6500 Population II giants in Galactic globular clusters (GGCs), covering a wide range in metallicity (?2.0 < Fe/H] < 0.0). New relations for BC K versus ( V ? K ) , ( J ? K ) and BC V versus ( B ? V ), ( V ? I ), ( V ? J ), and new calibrations for T eff, using both an empirical relation and model atmospheres, are provided. Moreover, an empirical relation to derive the R parameter of the infrared flux method as a function of the stellar temperature is also presented. |
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| Keywords: | techniques: photometric stars: evolution stars: fundamental parameters Hertzsprung–Russell (HR) diagram stars: Population II globular clusters: general |
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