Issue |
A&A
Volume 442, Number 2, November I 2005
|
|
---|---|---|
Page(s) | 437 - 442 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20042359 | |
Published online | 07 October 2005 |
HST photometry of the binary globular cluster Sersic 13N-S in NGC 5128
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
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 () 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
.
We have estimated their ages in
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
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.