The tip of the red giant branch (a comparison of theory and observation)
Observational data on the five brightest giants in the globular clusters M3, M5, M13, M15, and M92 are compared with theoretically computed data on the helium flash. The theoretical models considered agree with the observations: with increasing metal abundance T/sub eff/(f1) decreases, i.e., the values (B- V)$sub 0$(5), the mean (B-V)$sub 0$ value for the five brightest giants of a cluster (Fig. 3), increase. It is shown that a comparison of the observed mean absolute magnitudes of the five brightest giants of the different clusters, M/ subV/(5), with the computed M/sub bol/(f1) can provide data on bolometric corrections. It is also pointed out that a more complete array of models with computed evolutionary tracks for giants and additional observational data on the masses of giants of different clusters are necessary for a more detailed comparison of theory and observations. (AIP)
- Research Organization:
- Main Astronomical Observatory, Academy of Sciences of the USSR
- NSA Number:
- NSA-33-030599
- OSTI ID:
- 4043672
- Journal Information:
- Sov. Astron. AJ (Engl. Transl.), v. 19, no. 4, pp. 492-494, Other Information: Orig. Receipt Date: 30-JUN-76
- Country of Publication:
- United States
- Language:
- English
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