Studies in Stellar Evolution.IX. Theoretical Isochrones for Early-Type Clusters
1970; IOP Publishing; Volume: 159; Linguagem: Inglês
10.1086/150366
ISSN1538-4357
AutoresErik E. Simpson, R. E. Hills, W. Hoffman, Sanford A. Kellman, Jr. Morton Erwin, Francesco Paresce, C. J. Peterson,
Tópico(s)Astro and Planetary Science
Resumoview Abstract Citations (24) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Studies in Stellar Evolution.IX. Theoretical Isochrones for Early-Type Clusters Simpson, Erik ; Hills, R. E. ; Hoffman, Wilson ; Kellman, Sanford A. ; Morton, Erwin, Jr. ; Paresce, Francesco ; Peterson, Charles Abstract Theoretical isocbrones are constructed for stars of intermediate mass with a solar-type chemical composition of X = 0.730, Y = 0.245, and Z = 0.025. The effects of small changes in helium abundance are investigated by means of other isochrones computed with X = 0.700, Y = 0.275, and Z = 0.025. The effect on the isochrones is negligible. The isochrones are then fitted to some diagrams of galactic clusters in an effort to determine their ages and distances. Some difficulties encountered and possible explanations are discussed. Publication: The Astrophysical Journal Pub Date: March 1970 DOI: 10.1086/150366 Bibcode: 1970ApJ...159..895S full text sources ADS | Related Materials (9) Part 1: 1965ApJ...141.1019B Part 2: 1965ApJ...142..451B Part 3: 1965ApJ...142..841H Part 4: 1966ApJ...144..709B Part 5: 1966ApJ...146..858H Part 6: 1968ApJ...153..495F Part 7: 1969ApJ...155..957T Part 8: 1969ApJ...156..549H Part 10: 1972ApJ...173..109H
Referência(s)