The interpretation of the two-color and color-magnitude diagrams of M15 and M92
Journal Article
·
· Astrophys. J., v. 184, no. 1, pp. 211-226
OSTI ID:4323698
From the theoretical relation between U--B, B--V and T/sub eff/, g for Population II stars and the observed color-magnitude diagrams, we determine the T/ sub eff/ and L values for the red giants and horizontal-branch stars in M15 and M92. Several possibilities for the stellar masses, the metal abundances, and distance moduli are considered. The empirical'' (luminosity, T/sub eff/) - diagrams are compared with theoietical evolutionary tracks. The comparison suggests that Z(M15) t(M92), and the masses M(M15) < M(Mg2), while possibly Y(M15) > Y(M92). The average values found for both clusters are log Z=-4 plus or minus 0.3, Y=0.25 plus or minus 0.03, t/sub 10/ =1.36 plus or minus 0.05, M/M sub solar = 0.85 plus or minus 0.05. (auth)
- Research Organization:
- Astronomy Department, University of Washington, Seattle
- NSA Number:
- NSA-29-021841
- OSTI ID:
- 4323698
- Journal Information:
- Astrophys. J., v. 184, no. 1, pp. 211-226, Journal Name: Astrophys. J., v. 184, no. 1, pp. 211-226; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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