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Title:
A Panchromatic Study of the Globular Cluster NGC 1904. I. The Blue Straggler Population
Authors:
Lanzoni, B.; Sanna, N.; Ferraro, F. R.; Valenti, E.; Beccari, G.; Schiavon, R. P.; Rood, R. T.; Mapelli, M.; Sigurdsson, S.
Affiliation:
AA(Dipartimento di Astronomia, Università degli Studi di Bologna, via Ranzani 1, I-40127 Bologna, Italy.; INAF-Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy.), AB(Dipartimento di Fisica, Università degli Studi di Roma Tor Vergata, via della Ricerca Scientifica, 1, I-00133 Roma, Italy.), AC(Dipartimento di Astronomia, Università degli Studi di Bologna, via Ranzani 1, I-40127 Bologna, Italy.), AD(European Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, Chile.), AE(INAF-Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy.; Dipartimento di Scienze della Comunicazione, Università degli Studi di Teramo, Italy.; INAF-Osservatorio Astronomico di Collurania, Via Mentore Maggini, I-64100 Teramo, Italy.), AF(Astronomy Department, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904.), AG(Astronomy Department, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904.), AH(University of Zürich, Institute for Theoretical Physics, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.), AI(Department of Astronomy and Astrophysics, The Pennsylvania State University, 525 Davey Lab, University Park, PA 16802.)
Publication:
The Astrophysical Journal, Volume 663, Issue 2, pp. 1040-1048. (ApJ Homepage)
Publication Date:
07/2007
Origin:
UCP
ApJ Keywords:
Stars: Binaries: Close, Stars: Blue Stragglers, Galaxy: Globular Clusters: Individual: NGC Number: NGC 1904, Stars: Evolution
DOI:
10.1086/518688
Bibliographic Code:
2007ApJ...663.1040L

Abstract

By combining high-resolution (HST/WFPC2) and wide-field ground-based (2.2 m ESO/WFI) and space (GALEX) observations, we have collected a multiwavelength photometric database (ranging from the far-UV to the near infrared) of the galactic globular cluster NGC 1904 (M79). The sample covers the entire cluster extension, from the very central regions up to the tidal radius. In the present paper, such a data set is used to study the BSS population and its radial distribution. A total number of 39 bright (m218<=19.5) BSSs have been detected, and they have been found to be highly segregated in the cluster core. No significant upturn in the BSS frequency has been observed in the outskirts of NGC 1904, in contrast to other clusters (M3, 47 Tuc, NGC 6752, M5) studied with the same technique. Such evidence, coupled with the large radius of avoidance estimated for NGC 1904 (ravoid~30 core radii), indicates that the vast majority of the cluster heavy stars (binaries) has already sunk to the core. Accordingly, extensive dynamical simulations suggest that BSSs formed by mass transfer activity in primordial binaries evolving in isolation in the cluster outskirts represent only a negligible (0%-10%) fraction of the overall population.

Based on observations with the NASA/ESA HST, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS5-26555. Also based on GALEX observations (program GI-056) and WFI observations collected at the European Southern Observatory, La Silla, Chile, within the observing programs 62.L-0354 and 64.L-0439.

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