SIMBAD references

1999A&A...341...98S - Astronomy and Astrophysics, volume 341, 98 (1999/1-1)

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


Abstract (from CDS):

UBV profile fitting photometry is presented for 1469 stars within 90" 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, RV=AV/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.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: luminosity function, mass function - ISM: dust, extinction - Galaxy: open clusters and associations: general - galaxies: Magellanic Clouds

VizieR on-line data: <Available at CDS (J/A+A/341/98): table2.dat>

Nomenclature: Table 2: Cl* NGC 2070 SMB NNNN (Nos 1-1469).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 8

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