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J/A+A/564/A40 VFTS. O-type stellar content of 30 Dor (Walborn+, 2014)
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Beginning of ReadMe :J/A+A/564/A40 VFTS. O-type stellar content of 30 Dor (Walborn+, 2014)
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The VLT-FLAMES Tarantula Survey. XIV. The O-type stellar content of 30 Doradus.
Walborn N.R., Sana H., Simon-Diaz S., Maiz Apellaniz J., Taylor W.D.,
Evans C.J., Markova N., Lennon D.J., de Koter A.
<Astron. Astrophys., 564, A40-40 (2014)>
=2014A&A...564A..40W
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ADC_Keywords: Magellanic Clouds ; Stars, O ; MK spectral classification
Keywords: stars: early-type - stars: fundamental parameters - stars: massive -
galaxies: star clusters: individual: 30 Doradus - Magellanic Clouds
Abstract:
Detailed spectral classifications are presented for 352 O-B0 stars in
the VLT-FLAMES Tarantula Survey ESO Large Programme, of which 213
O-type are judged of sufficiently high quality for further
morphological analysis. Among them, six subcategories of special
interest are distinguished. (1) Several new examples of the earliest
spectral types O2-O3 have been found, while a previously known example
has been determined to belong to the nitrogen-rich ON2 class. (2) A
group of extremely rapidly rotating main-sequence objects has been
isolated, including the largest vsini values known, the spatial and
radial-velocity distributions of which suggest ejection from the two
principal ionizing clusters NGC 2070 and NGC 2060. (3) Several new
examples of the evolved, rapidly rotating Onfp class show similar
evidence, although at least some of them are spectroscopic binaries.
(4) No fewer than 48 members of the Vz category, hypothesized to be on
or near the zero-age main sequence, are found in this sample; in
contrast to the rapid rotators, they are strongly concentrated to the
ionizing clusters and a newly recognized region of current and recent
star formation to the north, supporting their interpretation as very
young objects, as do their relatively faint absolute magnitudes. (5) A
surprisingly large fraction of the main-sequence spectra belong to the
recently recognized V((fc)) class, with CIII emission lines of similar
strength to the usual NIII in V((f)) spectra, although a comparable
number of the latter are also present, as well as six objects with
very high-quality data but no trace of either emission feature,
presenting new challenges to physical interpretations. (6) Two mid-O
Vz and three late-O giant/supergiant spectra with morphologically
enhanced nitrogen lines have been detected. Absolute visual magnitudes
have been derived for each star with individual extinction laws, and
composite Hertzsprung-Russell diagrams provide evidence of the
multiple generations present in this field. Spectroscopic binaries,
resolved visual multiples, and possible associations with X-ray
sources are noted. Astrophysical and dynamical analyses of this unique
dataset underway will provide new insights into the evolution of
massive stars and starburst clusters.