Recio-Blanco, A. and Aparicio, A. and Piotto, G. and De Angeli, F. and Djorgovski, S. G. (2006) Multivariate analysis of globular cluster horizontal branch morphology: searching for the second parameter. Astronomy and Astrophysics, 452 (3). pp. 875-884. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20100319-102726492
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Aims. The interpretation of globular cluster horizontal branch (HB) morphology is a classical problem that can significantly blur our understanding of stellar populations. Methods. We present a new multivariate analysis connecting the effective temperature extent of the HB with other cluster parameters. The work is based on Hubble Space Telescope photometry of 54 Galactic globular clusters. Results. The present study reveals the important role of the total mass of the globular cluster on its HB morphology. More massive clusters tend to have HBs more extended to higher temperatures. For a set of three input variables including the temperature extension of the HB, [Fe/H] and M_V, the first two eigenvectors account for 90% of the total sample variance. Conclusions. Possible effects of cluster self-pollution on HB morphology, stronger in more massive clusters, could explain the results derived here.
|Additional Information:||© ESO 2006. Received 7 March 2005. Accepted 16 November 2005. A. Recio-Blanco thanks for support of the European Space Agency. G.P. and F.D.A. acknowledge partial support by ASI and by MIUR under the program PRIN2003. This work was supported in part by the STScI grants GO-6095, GO-7470, GO-8118, and GO-8723.|
|Subject Keywords:||Galactic structure, stellar clusters, and populations|
|Official Citation:||Multivariate analysis of globular cluster horizontal branch morphology: searching for the second parameter A. Recio-Blanco, A. Aparicio, G. Piotto, F. De Angeli and S. G. Djorgovski A&A 452 (3) 875-884 (2006) DOI: 10.1051/0004-6361:20053006|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||22 Mar 2010 03:41|
|Last Modified:||26 Dec 2012 11:55|
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