HST photometry of the binary globular cluster Sersic 13N-S in NGC 5128

Free access article

Issue		A&A Volume 442, Number 2, November I 2005


Page(s)		437 - 442
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361:20042359

A&A 442, 437-442 (2005)
DOI: 10.1051/0004-6361:20042359

HST photometry of the binary globular cluster Sersic 13N-S in NGC 5128

D. Villegas¹, D. Minniti¹ and J. G. Funes²

¹ Department of Astronomy, P. Universidad Católica, Av. Vicuña Mackenna 4860, Casilla 306, Santiago 22, Chile
e-mail: dvillega@astro.puc.cl
² Vatican Observatory Research Group, Steward Observatory, University of Arizona, Tucson AZ 85721, USA

(Received 12 November 2004 / Accepted 19 May 2005 )

Abstract
Using Hubble Space Telescope archival images we resolved individual stars in two young globular clusters centered in the giant HII region Sersic 13, on the dust band of NGC 5128. We resolved 5 sources in the southern cluster and 4 sources in the northern one. The high U luminosity of these stars ( $-9.3 < M_{\it {\it F336W}} <-7.8$ ) added to the previously detected WR features in the integrated spectra of the clusters suggest we are identifying the most massive stars of the clusters, with O or WR spectral types, whose masses can even reach 120 $M_{\odot}$ . We have estimated their ages in $t \leq 6 \times 10^{6}$ yr for comparison with two different set of isochrones, which is consistent with an scenario where the clusters form a binary pair that would merge in a short timescale.

Key words: galaxies: individual: NGC 5128 -- galaxies: star clusters

SIMBAD Objects

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.