Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.9502s&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #95.02; Bulletin of the American Astronomical Society, Vol. 33, p.1181
Astronomy and Astrophysics
Astronomy
Scientific paper
In a recent series of papers Selman et al. studied the central cluster of the 30 Doradus super-association and found that the highly variable reddening was a major contributor to all kinds of systematic effects, which plagued previous analysis of this kind. They then devised a bayesian method to minimize these systematic errors, and when applied to the area right near the core of the NGC2070 cluster they concluded: (1) the IMF is almost perfectly Salpeter within the area studied; (2) some deviations from Salpeter can be found right at the core, and in a ring at 6pc from the cluster center; and (3), the star formation history appears to be punctuated by discrete episodes of star formation at 1My, 2.5My, and 5My; these episodes appear to be present all over the cluster as no age gradients were detected. In this poster we will present the data from that work, together with the preliminary results of a research program aimed to extend the previous work to the larger super-association. The data was obtained with the Wide Field Imager at the MPG/ESO 2.2-m telescope at La Silla, and covers a 1 square degree area in UBV. This poster will concentrate on the special challenges of performing accurate photometry (≈ 1%) with wide-field instruments, and will present the preliminary results of the photometry.
Melnick Jorge
Selman Fernando J.
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