The VLT-FLAMES Tarantula Survey

被引：0
|
作者：
Britavskiy, N. [1 ,2 ]
Lennon, D. J. [1 ,3 ]
Patrick, L. R. [1 ,2 ]
Evans, C. J. [4 ]
Herrero, A. [1 ,2 ]
Langer, N. [5 ]
van Loon, J. Th. [6 ]
Clark, J. S. [7 ]
Schneider, F. R. N. [8 ,9 ,10 ]
Almeida, L. A. [11 ]
Sana, H. [12 ]
de Koter, A. [13 ]
Taylor, W. D. [4 ]
机构：
[1] Inst Astrofis Canarias, Tenerife 38205, Spain
[2] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain
[3] ESA, European Space Astron Ctr, Apdo Correos 78, Madrid 28691, Spain
[4] Royal Observ, UK Astron Technol Ctr, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland
[5] Univ Bonn, Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany
[6] Keele Univ, Lennard Jones Labs, Keele ST5 5BG, Staffs, England
[7] Open Univ, Sch Phys Sci, Walton Hall, Milton Keynes MK7 6AA, Bucks, England
[8] Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England
[9] Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany
[10] Heidelberger Inst Theoret Studien, Schloss Wolfsbrunnenweg 35, D-69118 Heidelberg, Germany
[11] Univ Fed Rio Grande do Norte, Dept Fis Teor & Expt, CP 1641, BR-59072970 Natal, RN, Brazil
[12] Katholieke Univ Leuven, Inst Astrophys, Celestijnlaan 200D, B-3001 Leuven, Belgium
[13] Univ Amsterdam, Anton Pannenkoek Inst Astron, NL-1090 GE Amsterdam, Netherlands
来源：
ASTRONOMY & ASTROPHYSICS | 2019年 / 624卷
基金：
美国国家航空航天局; 美国国家科学基金会;
关键词：
stars: late-type; stars: fundamental parameters; supergiants; open clusters and associations: individual: NGC2100; open clusters and associations: individual: Hodge 301; open clusters and associations: individual: SL 639; LARGE-MAGELLANIC-CLOUD; EFFECTIVE TEMPERATURE SCALE; RED SUPERGIANT STARS; MASS-LOSS; SPECTRAL CLASSIFICATION; PRESUPERNOVA EVOLUTION; STELLAR POPULATIONS; MODEL ATMOSPHERES; 30; DORADUS; CLUSTER;
D O I：
10.1051/0004-6361/201834564
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 - K-s)(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 NGC2100 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 NGC2100.
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