Hostname: page-component-848d4c4894-ttngx Total loading time: 0 Render date: 2024-05-04T04:21:35.232Z Has data issue: false hasContentIssue false
  • English
  • Français

Observational Aspects of RR Lyrae Variables in Globular Clusters

Published online by Cambridge University Press:  12 April 2016

L. Rosino
L. Rosino*
Affiliation:
Astrophysical Observatory, Asiago, Italy

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

RR Lyrae variables play a prominent role in many of the problems of globular clusters, and from several points of view. In the first place they can be considered as pretty good indicators of population and distance; although they do not form a completely homogeneous set of stars, the knowledge of their mean absolute magnitude gives a powerful means of establishing distances within and outside the Galaxy, and hence of determining the form and size of the Galaxy itself. Moreover, the number of RR Lyrae stars in clusters, the relative frequency of RRc and RRab, types, the length of the transition periods, the array of colors, when correctly interpreted, give important information on the degree of evolution, age and chemical composition of the clusters. Placed as they are in a peculiar region of the H — R diagram of Population II, the RR Lyr variables can be used as a good test of the theories of advanced evolution or the models of pulsating stars.

Type
Part II / RR Lyrae Variables in Population II Systems
Information
International Astronomical Union Colloquium , Volume 21: Variable Stars in Globular Clusters and in Related Systems , August 1973 , pp. 51 - 67
Copyright
Copyright © Reidel 1973

References

Belserene, E. P.: 1952, Astron. J. 57, 237.Google Scholar
Belserene, E. P.: 1964, Astron. J. 69, 475.CrossRefGoogle Scholar
Castellani, V., Giannone, P., and Renzini, A.: 1970, Astrophys. Space Sci. 9, 418.Google Scholar
Castellani, V., Giannone, P., and Renzini, A.: 1972, Private communication.Google Scholar
Christy, R. F.: 1966, Astrophys. J. 144, 108.Google Scholar
Coutts, C. M. and Sawyer Hogg, H. B.: 1969, Publ. David Dunlap Obs. 3, 1.Google Scholar
Detre, L.: 1961, IAU Reports on Astronomy XIB, 295.Google Scholar
Dickens, R. J.: 1970, Astrophys. J. Suppl. 22, 187.Google Scholar
Dickens, R. J. and Saunders, J.: 1965, Roy. Obs. Bull. No. 101.Google Scholar
Eggen, O. J. and Sandage, A.: 1959, Monthly Notices Roy. Astron. Soc. 119, 255.Google Scholar
Eggen, O. J. and Sandage, A.: 1962, Astrophys. J. 136, 735.CrossRefGoogle Scholar
Faulkner, J. and Iben, I.: 1966, Astrophys. J. 144, 995.Google Scholar
Fourcade, C. R. and Laborde, J. R.: 1966, Atlas y Catalogo de Estrellas variables en cumulos globulares al sur de — 29°, Cordoba.Google Scholar
Fourcade, C. R. and Laborde, J.: 1969, Mem. Soc. astr. Ital. 40, 1.Google Scholar
Geyer, E. H. and Szeidl, B.: 1970, Astron. Astrophys. 4, 40.Google Scholar
Hartwick, F. D. A.: 1968, Astrophys. J. 154, 475.Google Scholar
Kukarkin, B. V.: 1961, Trans. IAU, XIB, 300.Google Scholar
Margoni, R.: 1965, Contr. Oss. astrofis. Univ. Padova No. 170.Google Scholar
Margoni, R.: 1967, Contr. Oss. astrofis. Univ. Padova No. 198.Google Scholar
Martin, W. Ch.: 1938, Ann. Sterrew. Leiden 17, II.Google Scholar
Oosterhoff, P. Th.: 1939, Observatory 62, 104.Google Scholar
Oosterhoff, P. Th.: 1941, Ann. Sterrew. Leiden 17, IV.Google Scholar
Oosterhoff, P. Th.: 1944, Bull. Astron. Inst. Netherlands 10, 58.Google Scholar
Sandage, A.: 1958, in O’Connell, D. J. K. (ed.), Stellar Populations, North Holland Pub. Co., Amsterdam p. 41.Google Scholar
Sandage, A. and Wildey, R. L.: 1967, Astrophys. J. 150, 469.Google Scholar
Sandage, A.: 1969, Astrophys. J. 157, 515.Google Scholar
Sandage, A.: 1970, Astrophys. J. 162, 841.Google Scholar
Sawyer Hogg, H. B.: 1944, Commun. David Dunlap Obs. No. 11.Google Scholar
Szeidl, B.: 1965, Mitt. Sternw. Ungar. Akad. Wiss. No. 58, p 265.Google Scholar
Wachmann, A. A.: 1968, Astr. Abh. Hamburg. Sternw. Bergedorf VIII, 4.Google Scholar
Wesselink, A. J.: 1969, Monthly Notices Roy. Astron. Soc. 144, 297.CrossRefGoogle Scholar
Woolley, R. and Savage, A.: 1971, Roy. Obs. Bull. No. 170.Google Scholar