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Multivariate analysis of globular cluster horizontal branch morphology: searching for the second parameter

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. https://resolver.caltech.edu/CaltechAUTHORS:20100319-102726492

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1051/0004-6361:20053006DOIUNSPECIFIED
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.
Funders:
Funding AgencyGrant Number
European Space AgencyUNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)PRIN2003
Space Telescope Science Institute (STScI)GO-6095
Space Telescope Science Institute (STScI)GO-7470
Space Telescope Science Institute (STScI)GO-8118
Space Telescope Science Institute (STScI)GO-8723
Subject Keywords:Galactic structure, stellar clusters, and populations
Issue or Number:3
Record Number:CaltechAUTHORS:20100319-102726492
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20100319-102726492
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.
ID Code:17780
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Mar 2010 03:41
Last Modified:03 Oct 2019 01:33

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