The ionizing cluster of 30 Doradus. I. Internal reddening from NTT photometry and multi-object spectroscopy

Details The ionizing cluster of 30 Doradus. I. Internal reddening from NTT photometry and multi-object spectroscopy The ionizing cluster of 30 Doradus. I. Internal reddening from NTT photometry and multi-object spectroscopy

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...341...98s&link_type=abstract

Astronomy and Astrophysics, v.341, p.98-109 (1999)

Astronomy and Astrophysics

Astrophysics

29

Stars: Early-Type, Stars: Luminosity Function, Mass Function, Ism: Dust, Extinction, Galaxy: Open Clusters And Associations: General, Galaxies: Magellanic Clouds

Scientific paper

UBV profile fitting photometry is presented for 1469 stars within 90arcsec of the center of the ionizing cluster of 30 Doradus (NGC 2070). A value of 0.82 +/- 0.03 is found for the extinction parameter S = E(U-B)/E(B-V), constant over almost the whole area covered by this research, with some evidence for local variations. Two reddening components can be identified: a smooth and moderate one that increases towards R136, and a clumpy one varying widely across the face of the cluster. The total-to-selective extinction parameter, R_V = A_V/E(B-V), is found to be in the range of 3.0 to 3.7, consistent with previous determinations. A new visualization tool, the colour-magnitude stereogram, is introduced and used to argue that: (1) the observations imply mass segregation in a dust filled cluster; (2) that there has been continuous dust formation near the cluster core up to the present; and (3) that an insidious systematic error has plagued previous determinations of IMF slopes. A method to obtain an unbiased estimate of the slope is discussed. Based on observations collected with the NTT ESO telescope. Table~2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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