Bibcode
Britavskiy, N.; Lennon, D. J.; Patrick, L. R.; Evans, C. J.; Herrero, A.; Langer, N.; van Loon, J. Th.; Clark, J. S.; Schneider, F. R. N.; Almeida, L. A.; Sana, H.; de Koter, A.; Taylor, W. D.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 624, id.A128, 13 pp.
Fecha de publicación:
4
2019
Revista
Número de citas
35
Número de citas referidas
30
Descripción
Aims: We estimate physical parameters for the late-type massive
stars observed as part of the VLT-FLAMES Tarantula Survey (VFTS) in the
30 Doradus region of the Large Magellanic Cloud (LMC). Methods:
The observational sample comprises 20 candidate red supergiants (RSGs)
which are the reddest ((B - V) > 1 mag) and brightest (V < 16 mag)
objects in the VFTS. We use optical and near-infrared (near-IR)
photometry to estimate their temperatures and luminosities, and
introduce the luminosity-age diagram to estimate their ages.
Results: We derive physical parameters for our targets, including
temperatures from a new calibration of (J - Ks)0
colour for luminous cool stars in the LMC, luminosities from their
J-band magnitudes (thence radii), and ages from comparisons with current
evolutionary models. We show that interstellar extinction is a
significant factor for our targets, highlighting the need to take it
into account in the analysis of the physical parameters of RSGs. We find
that some of the candidate RSGs could be massive AGB stars. The apparent
ages of the RSGs in the Hodge 301 and SL 639 clusters show a significant
spread (12-24 Myr). We also apply our approach to the RSG population of
the relatively nearby NGC 2100 cluster, finding a similarly large
spread. Conclusions: We argue that the effects of mass transfer
in binaries may lead to more massive and luminous RSGs (which we call
"red stragglers") than expected from single-star evolution, and that the
true cluster ages correspond to the upper limit of the estimated RSG
ages. In this way, the RSGs can serve as a new and potentially reliable
age tracer in young star clusters. The corresponding analysis yields
ages of 24-3+5 Myr for Hodge 301,
22-5+6 Myr for SL 639, and
23-2+4 Myr for NGC 2100.
Based on observations at the European Southern Observatory in programme
182.D-0222.
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