Theoretical Study on Observed Color-magnitude Diagrams

Details Theoretical Study on Observed Color-magnitude Diagrams Theoretical Study on Observed Color-magnitude Diagrams

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jkas...12...41l&link_type=abstract

Jounal of korean Astronomical Society, vol. 12,p. 41-70

Astronomy and Astrophysics

Astronomy

4

Scientific paper

From Bohm-Vitense's atmospheric model calculations,[T_e,(B-V)] and [B.C.,(B-V)] with respect to heavy element abundance were obtained. Using these relations and evolutionary model calculations of Rood, and Sweigart and Gross, analytic expressions for some physical parameters relating to the C-M diagrams of globular clusters were derived, and they were applied to 21 globular clusters with observed transition period of RR Lyrae variables. More than 20 different parameters were examined for each globular cluster. The derived ranges of some basic parameters for red giants, m_RG = 0.74~ 0.91 solar mass, mass for RR Lyrae stars, m_RR= 0.59~0.75 solar mass, the visual magnitude differrence between the turnoff point and the horizontal branch (HB), deltaV_to = 3.1~ 3.4 ( = 3.32), the color of the blue edge of RR Lyrae gap, (B-V)_BE = 0.17~ 0.21 (<(B-V)_BE>= 0.18), [m/L]_RR = -1.7~ -1.9 , mass difference of m_RR relative to m_RG,(m_RG- m_RR)/m_RG = 0.0~ 0.39.

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