Abstract
Four years ago we began a study of globular cluster giant stars in the infrared. The first part of this program, the measurement of the 1.2–2.2 µm energy distributions with the use of broad band filters and the determination of the strengths of CO and H2O absorption in the stars has been published, or will soon appear in press. M3, M13, and M92 are discussed in Cohen, Frogel, and Persson (1978, hereafter CFP); M71 in Frogel, Persson, and Cohen (1979); ω Centauri in Persson et al. (1980); Pal 12 in Cohen et al. (1980); 47 Tucanae in Frogel, Persson, and Cohen (1981, hereafter FPC1); and NGC 3201 in Da Costa, Frogel, and Cohen (1981). We now have in hand similar data for 167 stars in 11 additional clusters: NGC 288, 362, 5904 (M5), 6121 (M4), 6352, 6397, 6637 (M69), 6656 (M22), 6752, 7006, and 7078 (M15) (Frogel, Persson, and Cohen 1982, hereafter FPC2). Pilachowski (1978) has also published data on several of these clusters and M10. With a rather complete sample of cluster types, we can proceed to examine how physical quantities derivable from infrared data vary from cluster to cluster. Furthermore it should be possible to establish “benchmarks” against which theoretical models of stellar atmospheres and evolutionary tracks can be tested.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Cohen, J.G.: 1978, Astrophys. J. 223, 487.
Cohen, J.G.: 1979, Astrophys. J. 231, 751.
Cohen, J.G.: 1980, Astrophys. J., submitted.
Cohen, J.G., Frogel, J.A. and Persson, S.E.: 1978, Astrophys. J. 222, 165 (CFP).
Cohen, J.G., Frogel, J.A., Persson, S.E. and Zinn, R.: 1980, Astrophys. J. 239, 74.
Da Costa, G.S., Frogel, J.A. and Cohen, J.G.: 1981, Astrophys. J., in press.
Dickens, R.J., Bell, R.A. and Gustaffson, B.: 1979, Astrophys. J. 131, 428.
Frogel, J.A., Persson, S.E. and Cohen, J.G.: 1979, Astrophys. J. 227, 499.
Frogel, J.A., Persson, S.E. and Cohen, J.G.: 1981, Astrophys. J., in press.
Frogel, J.A., Persson, S.E. and Cohen, J.G.: 1982, Astrophys. J., to be submitted.
Griffin, R.: 1975, M.N.R.A.S. 171, 181.
Harris, W.E.: 1980, I.A.U. Symp. No. 85 on Star Cluster, ed. J.E. Hesser, Reidel, Dordrecht, p. 81.
Harris, W.E. and Racine, R.: 1979, Ann. Rev. Astron. and Astrophys. 17, 241.
Persson, S.E., Frogel, J.A., Cohen, J.G., Aaronson, M. and Matthews, K.: 1980, Astrophys. J. 235, 452.
Pilachowski, C.A.: 1978, Astrophys. J. 224, 412.
Pilachowski, C.A., Canterna, R. and Wallerstein, G.: 1980, Astrophys. J. (Letters) 235, L21.
Renzini, A.: 1977, in Advanced Stages in Stellar Evolution, Ed. P. Bouvier, A. Maeder, Geneva, p. 149.
Ridgway, S.T., Joyce, R.R., White, N.M. and Wing, R.F.: 1980, Astrophys. J. 235, 126.
Rood, R.T.: 1972, Astrophys. J. 177, 681.
Sweigart, A.V. and Gross, P.G.: 1978, Astrophys. J. Suppl. 36, 405.
Zinn, R.: 1980, Astrophys. J. Suppl. 42, 19.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1981 D. Reidel Publishing Company
About this paper
Cite this paper
Frogel, J.A., Persson, S.E., Cohen, J.G. (1981). Globular Cluster Giant Branches and the Helium Flash: A Comparison between Observation and Theory. In: Iben, I., Renzini, A. (eds) Physical Processes in Red Giants. Astrophysics and Space Science Library, vol 88. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-8492-9_6
Download citation
DOI: https://doi.org/10.1007/978-94-009-8492-9_6
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-009-8494-3
Online ISBN: 978-94-009-8492-9
eBook Packages: Springer Book Archive