Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.8106m&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #81.06; Bulletin of the American Astronomical Society, Vol. 33, p.910
Astronomy and Astrophysics
Astronomy
Scientific paper
We present long-slit 3000-10000 Å spectroscopy of the bright super star cluster A (SSC-A) in the irregular starburst galaxy NGC 1569, obtained with STIS on board the Hubble Space Telescope (HST). The 0.05" HST angular resolution allows, for the first time, to probe for spatial variations in the stellar population of a ~ 106 Msun SSC. Integrated ground-based spectra of SSC-A have previously revealed young Wolf-Rayet (WR) signatures that coexist with features from older, red giant, populations. We find that the WR emission complexes come solely from the subcluster A2, identified in previous HST imaging, and are absent from the main cluster A1. The equivalent widths of the WR features in A2 -- including the C IV λ 5808 complex which we detect for the first time in this object -- are much larger than predicted by models with sub-solar metallicity, posing a new problem. On the ``clean'' NW side of A1, we find no evidence for radial gradients in the stellar population between 0.05"
Ho Luis C.
Maoz Dan
Sternberg Amiel
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