30 Doradus - Ultraviolet and optical stellar photometry

Details 30 Doradus - Ultraviolet and optical stellar photometry 30 Doradus - Ultraviolet and optical stellar photometry

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...413..604h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 413, no. 2, p. 604-610.

Astronomy and Astrophysics

Astronomy

21

Astronomical Photometry, Sky Surveys (Astronomy), Stellar Magnitude, Ultraviolet Astronomy, Interstellar Extinction, Magellanic Clouds, Space Observations (From Earth), Stellar Spectra

Scientific paper

Ultraviolet Imaging Telescope (UIT) UV magnitudes in four bands, together with optical B magnitudes, are presented for up to 314 early-type stars located in a 9.7 x 9.7 arcmin field centered on R136. The magnitudes have an rms uncertainty estimated at 0.10 mag from a comparison between the UIT magnitudes and the IUE spectra. Spectral types and E(B-V) color excesses are estimated. The mean color excesses following the two extinction curves agree well with the predictions of the two-component extinction model of Fitzpatrick and Savage (1984). However, the degree of nebular extinction is found to vary systematically by large amounts over the 30 Dor field. The minimum of nebular extinction in the central parts of the nebula suggests that dust has been expelled from this region by stellar winds. It is suggested that the form of the UV extinction curve can be understood as a consequence of the evolutionary state of the stellar population responsible for making the dust grains.

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