DD 13 - A very young and heavily reddened early O star in the Large Magellanic Cloud

This paper investigates the Large Magellanic Cloud star DD 13, which is likely the major ionizing source of the nebula N159A. New optical spectroscopy and new estimates of the broadband photometric properties of DD 13 are obtained. A spectral type of O3-O6 V, E(B-V) = 0.64, and M(V) = -6.93 is found...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 373; p. 100
Main Authors Conti, Peter S., Fitzpatrick, Edward L.
Format Journal Article
LanguageEnglish
Published Legacy CDMS 20.05.1991
Subjects
640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources
Astrophysics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONTAMINATION
COSMIC DUST
DUSTS
FLUIDS
GALAXIES
GASES
IDENTIFICATION SYSTEMS
IONIZED GASES
LYMAN LINES
MAGELLANIC CLOUDS
MORPHOLOGY
NEBULAE
PHOTOMETRY
SPECTRA
STAR CLUSTERS
STARS
VISIBLE SPECTRA
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Summary:This paper investigates the Large Magellanic Cloud star DD 13, which is likely the major ionizing source of the nebula N159A. New optical spectroscopy and new estimates of the broadband photometric properties of DD 13 are obtained. A spectral type of O3-O6 V, E(B-V) = 0.64, and M(V) = -6.93 is found. The spectral type cannot be more precisely defined due to contamination of the spectral data by nebular emission, obliterating the important He I classification lines. These results, plus a published estimate of the Lyman continuum photon injection rate into N159A, suggest that DD 13 actually consists of about 2-4 young, early O stars still enshrouded by their natal dust cloud. The star DD 13 may be a younger example of the type of tight cluster represented by the LMC 'star' Sk-66 deg 41, recently revealed to be composed of six or more components.
Bibliography:CDMS
Legacy CDMS
ISSN:0004-637X
1538-4357
DOI:10.1086/170028