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J/A+A/564/A39 VLTS. O Vz stars in 30 Dor (Sabin-Sanjulian+, 2014)
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Beginning of ReadMe :J/A+A/564/A39 VFTS. OVz stars in 30 Dor (Sabin-Sanjulian+, 2014)
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The VLT-FLAMES Tarantula Survey.
XIII: On the nature of O Vz stars in 30 Doradus.
Sabin-Sanjulian C., Simon-Diaz S., Herrero A., Walborn N.R., Puls J.,
Maiz Apellaniz J., Evans C.J., Brott I., De Koter A., Garcia M.,
Markova N., Najarro F., Ramirez-Agudelo O.H., Sana H., Taylor W.D.,
Vink J.S.
<Astron. Astrophys., 564, A39-39 (2014)>
=2014A&A...564A..39S
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ADC_Keywords: Magellanic Clouds ; Stars, early-type
Keywords: Magellanic Clouds - stars: atmospheres - stars: early-type -
stars: fundamental parameters - stars: massive
Abstract:
OVz stars, a subclass of O-type dwarfs characterized by having
HeIIlambda4686 stronger in absorption than any other helium line in
their blue-violet spectra, have been suggested to be on or near the
zero-age main sequence (ZAMS). If their youth were confirmed, they
would be key objects with which to advance our knowledge of the
physical properties of massive stars in the early stages of their
lives.
We test the hypothesis of OVz stars being at a different (younger)
evolutionary stage than are normal O-type dwarfs.
We have performed the first comprehensive quantitative spectroscopic
analysis of a statistically meaningful sample of OVz and OV stars in
the same star-forming region, exploiting the large number of OVz stars
identified by the VLT-FLAMES Tarantula Survey in the 30 Doradus region
of the Large Magellanic Cloud (LMC). We obtained the stellar and wind
parameters of 38 OVz stars (and a control sample of 46 OV stars) using
the FASTWIND stellar atmosphere code and the IACOB-GBAT, a grid-based
tool developed for automated quantitative analysis of optical spectra
of O stars. In the framework of a differential study, we compared the
physical and evolutionary properties of both samples, locating the
stars in the logg vs. logT_eff_, logQ vs. logT_eff_, and logL/L_sun_
vs. logT_eff_ diagrams. We also investigated the predictions of the
FASTWIND code regarding the OVz phenomenon.