Документ взят из кэша поисковой машины. Адрес оригинального документа : http://star.arm.ac.uk/~ambn/abstract208.ps Дата изменения: Fri Oct 25 13:31:14 1996 Дата индексирования: Mon Oct 1 23:35:56 2012 Кодировка: Поисковые слова: massive stars

Effective temperature­colour and surface
brightness­colour relationships for the latest­type
stars
P.J. Amado and P.B. Byrne
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
October 17, 1996
Abstract
New calibrations of six broad­band optical and near infrared colours
(U \Gamma B, B \Gamma V , V \Gamma R, V \Gamma I, R \Gamma I and V \Gamma K) against accurate
effective temperatures (T eff ) derived from empirical and semi­empirical
(infrared flux) methods for G, K and M giants are presented. Polynomial
coefficients for these relationships are given. We also present independent
relationships between the visual surface brightness parameter FV and the
colours (V \Gamma R), (V \Gamma I), (R \Gamma I) and (V \Gamma K). We find that (U \Gamma B)
and (B \Gamma V ) are unsuitable as T eff indicators. The tightest relationship
in each case is found for the (V \Gamma K) index. Our mean relationships
agree reasonably well with similar relationships derived by other authors,
where such are available. These relationships are suitable for use in the
determination of spot areas and temperatures in active late­type stars.
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