2014A&A...564A..39S


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.28CEST04:20:30

2014A&A...564A..39S - Astronomy and Astrophysics, volume 564A, 39-39 (2014/4-1)

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. and VINK J.S.

Abstract (from CDS):

OVz stars, a subclass of O-type dwarfs characterized by having HeIIλ4686 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 30Doradus 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. logTeff, logQ vs. logTeff, and logL/L vs. logTeff diagrams. We also investigated the predictions of the FASTWIND code regarding the OVz phenomenon.We find a differential distribution of objects in terms of effective temperature, with OVz stars dominant at intermediate values. The OVz stars in 30Doradus tend to be younger (i.e., closer to the ZAMS) and less luminous, and they have weaker winds than the OV stars, but we also find examples with ages of 2-4Myr and with luminosities and winds that are similar to those of normal O dwarfs. Moreover, the OVz stars do not appear to have higher gravities than the OV stars. In addition to effective temperature and wind strength, our FASTWIND predictions indicate how important it is to take other stellar parameters (gravity and projected rotational velocity) into account for correctly interpreting the OVz phenomenon. In general, the OVz stars appear to be on or very close to the ZAMS, but there are some examples where the Vz classification does not necessarily imply extreme youth. In particular, the presence of OVz stars in our sample at more evolved phases than expected is likely a consequence of modest O-star winds owing to the low-metallicity environment of the LMC.

Abstract Copyright:

Journal keyword(s): Magellanic Clouds - stars: atmospheres - stars: early-type - stars: fundamental parameters - stars: massive

VizieR on-line data: <Available at CDS (J/A+A/564/A39): tablea1.dat tablea2.dat tablea3.dat>

Simbad objects: 91

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Number of rows : 91

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9520 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5728 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14941 1
4 2MASS J05370761-6905062 SB* 05 37 07.619 -69 05 06.22           O8.5Vz 7 0
5 VFTS 65 * 05 37 32.6127502123 -69 06 40.693285237   16.05 15.99     O8V(n) 8 0
6 VFTS 67 * 05 37 33.360 -69 02 47.57   16.99 16.83     O9.5Vz 7 0
7 [M2002] LMC 168648 * 05 37 34.5461720448 -69 10 10.197419402 15.788 16.563 16.386   16.255 O9Vn 9 0
8 [ST92] 1-25 * 05 37 36.8661763345 -69 08 22.752540834 15.542 16.367 16.193   15.842 O6.5V((f))zNstr 11 0
9 2MASS J05373854-6910199 SB* 05 37 38.5064292313 -69 10 19.870778041 12.875 13.744 13.710   13.555 O6V((n))((fc))z 9 0
10 VFTS 110 * 05 37 40.870 -69 10 48.44   15.76 15.7     O6V((n))z 8 0
11 VFTS 117 * 05 37 41.470 -69 10 46.96   16.82 16.64     O6:Vz 7 0
12 VFTS 123 * 05 37 42.4415181413 -69 12 21.453948635   15.88 15.78     O6.5Vz 8 0
13 VFTS 130 * 05 37 43.680 -69 10 50.47   16.83 16.67     O8.5V((n)) 7 0
14 [M2002] LMC 169093 * 05 37 43.9490933033 -69 09 39.023613174 14.784 15.983 15.780   15.890 O9.5Vz 9 0
15 VFTS 138 * 05 37 45.0366544692 -69 02 29.576476757   15.54 15.63     O9Vn 7 0
16 [M2002] LMC 169203 * 05 37 46.3024834822 -69 08 20.687131983 15.863 16.667 16.570   16.316 O9.5V 10 0
17 VFTS 154 SB* 05 37 47.090 -69 09 07.70   14.99 14.94     O8.5V 8 0
18 VFTS 168 * 05 37 49.5087828811 -69 12 33.067114953   15.54 15.46     O8.5Vz 7 0
19 [M2002] LMC 169366 * 05 37 49.9182694477 -69 10 27.884729986 13.649 14.619 14.437   14.224 O2.5V(n)((f*)) 11 0
20 NGC 2060 SNR 05 37 51.4470067818 -69 10 23.957283532   9.69 9.59     ~ 323 2
21 UCAC2 1803316 * 05 37 59.0527809170 -69 11 56.711100412 13.935 14.655 14.389 14.49 14.035 O4V((fc)) 10 0
22 VFTS 249 * 05 38 09.5610508731 -69 06 53.960362645   15.49 15.52     O8Vn 7 0
23 2MASS J05380995-6902310 * 05 38 09.957 -69 02 31.06   15.33 15.46     O8.5Vz 8 0
24 VFTS 250 * 05 38 10.2365259214 -69 08 56.390148553   15.76 15.74     O9.2V((n)) 7 0
25 VFTS 266 * 05 38 13.2873287973 -69 11 18.913864321   15.5 15.38     O8V((f))z 7 0
26 VFTS 280 * 05 38 16.5482428946 -69 04 53.196251802   15.4 15.40     O9V((n)) 7 0
27 VFTS 285 * 05 38 17.340 -69 05 42.14   15.57 15.63     O7.5Vnnn 12 0
28 2MASS J05382913-6857393 SB* 05 38 29.1463015987 -68 57 39.329312287   13.93 14.12     O4V((n))((fc))z 7 0
29 VFTS 356 * 05 38 29.2078948089 -69 09 13.769395840   16.03 15.87     O6:V(n)z 7 0
30 2MASS J05382952-6906206 * 05 38 29.53 -69 06 20.6   15.84 15.82     O8.5V 12 0
31 VFTS 369 * 05 38 30.610 -69 08 24.44   16.81 16.66     O9.7V 8 0
32 IRSF J05383202-6902525 * 05 38 32.001 -69 02 52.43   16.22 16.18     O6-7Vz 7 0
33 Cl* NGC 2070 SMB 226 * 05 38 32.280 -69 05 44.57   16.02 15.88   15.74 O4-5V((fc))z 8 0
34 Cl* NGC 2070 SMB 84 SB* 05 38 32.34 -69 05 23.7   14.65 14.65   14.79 O4-5V((n))((fc)) 13 0
35 Cl* NGC 2070 SMB 268 * 05 38 32.830 -69 05 44.60   16.23 16.10   15.91 O6-7V((f))z 9 0
36 Cl* NGC 2070 MEL 59a SB* 05 38 33.3923398035 -69 04 38.332530075   14.37 14.40     O5.5V((n))((f))z 10 0
37 [P93] 473 * 05 38 35.7404005460 -69 08 19.742550432   16.33 16.12     O5V((n))((fc))z 8 0
38 Cl* NGC 2070 SMB 158 * 05 38 35.84 -69 05 34.8   15.49 15.40   15.44 O9:V(n) 14 0
39 Cl* NGC 2070 MH 17 * 05 38 39.3750 -69 06 06.312   14.63 14.59   13.92 O2V((f*))+OB 20 0
40 2MASS J05383950-6904383 * 05 38 39.5046403462 -69 04 38.703188795   15.38 15.46     O6:V((f))z 11 0
41 [P93] 712 * 05 38 39.5562809299 -69 07 05.362378419   16.65 16.39     O6Vz 9 0
42 Cl* NGC 2070 SMB 309 * 05 38 40.240 -69 05 30.78   16.5 16.38     O9V 8 0
43 Cl* NGC 2070 SMB 124 * 05 38 40.360 -69 05 43.76   15.21 15.07   15.00 O6-7V((n)) 11 0
44 2MASS J05384074-6908249 * 05 38 40.7229732227 -69 08 24.934774483 15.347 16.015 15.808   15.458 O6V((f))z 12 0
45 Cl* NGC 2070 SMB 213 * 05 38 40.86 -69 06 57.5   15.91 15.62   15.10 O6V((fc)) 12 0
46 IRSF J05384106-6906599 * 05 38 41.040 -69 06 59.90   17.15 16.73   16.13 O8V(n) 9 0
47 Cl* NGC 2070 MH 123 * 05 38 41.040 -69 06 16.71   17.07 16.74   17.53 O9V 10 0
48 Cl* NGC 2070 SMB 347 * 05 38 41.098 -69 06 35.01   16.64 16.45   16.10 O9.5V 11 0
49 Cl* NGC 2070 MEL 25 SB* 05 38 41.5495267078 -69 05 19.506347564   13.33 13.31   13.36 ON2V((n))((f*)) 24 0
50 Cl* NGC 2070 SMB 143 SB* 05 38 41.730 -69 06 28.06   15.4 15.28   15.05 O5V((n))((fc))z 12 0
51 VFTS 521 ** 05 38 42.0154 -69 07 04.979   15.51 15.34     O9V(n) 14 0
52 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1749 1
53 Cl* NGC 2070 SMB 295 * 05 38 42.820 -69 06 32.43   16.44 16.21   15.87 O6Vz 9 0
54 2MASS J05384305-6903447 * 05 38 43.0354520985 -69 03 44.875335682   16.06 15.99     O5V((fc))z 11 0
55 2MASS J05384358-6907516 * 05 38 43.5871898616 -69 07 51.928524330   16.86 16.51     O6.5Vz 10 0
56 [P93] 1077 * 05 38 43.600 -69 04 42.46   15.34 15.25     O5V((fc))z 7 0
57 Cl* NGC 2070 SMB 343 * 05 38 43.790 -69 05 38.70   16.65 16.61   16.72 O9.7V 10 0
58 Cl* NGC 2070 SMB 350 * 05 38 44.350 -69 06 40.73   16.64 16.59   16.57 O9.5V 14 0
59 IRSF J05384494-6907046 * 05 38 44.997 -69 07 04.21   17.04 16.64     O6V((fc))z 8 0
60 2MASS J05384509-6904157 * 05 38 45.095 -69 04 15.76   16.25 16.07     O4-5V((fc)) 11 0
61 Cl* NGC 2070 SMB 414 * 05 38 45.190 -69 05 37.43   16.99 16.83   17.71 O9.5V((n)) 9 0
62 2MASS J05384539-6902514 pA? 05 38 45.3898786434 -69 02 51.451734273 13.564 14.574 14.491 13.97 14.826 O4V((n))((fc))z 15 0
63 Cl* NGC 2070 SMB 318 * 05 38 45.690 -69 06 15.33   16.54 16.40   16.39 O9.5Vn 9 0
64 Cl* NGC 2070 SMB 175 ** 05 38 46.0657 -69 06 56.245   15.59 15.56   15.62 O8-9V(n) 12 0
65 Cl* NGC 2070 MH 986 * 05 38 46.287 -69 05 59.28   14.78 14.69   14.62 O5-6V((n))z 21 0
66 Cl* NGC 2070 MH 1003 * 05 38 46.900 -69 05 58.71   16.29 16.16   16.16 O8V(n) 11 0
67 NAME Walborn 2 ** 05 38 48.1018 -69 04 42.239   15.66 15.39     O2V((f*))z 27 0
68 [P93] 9034 * 05 38 48.4029397230 -68 59 49.922792322 14.379 15.246 15.339   15.591 O9.7V 10 0
69 VFTS 638 * 05 38 49.5107058118 -69 02 30.333558677   15.49 15.63     O8.5Vz 7 0
70 [P93] 10002 * 05 38 49.6308201243 -69 09 24.106294192   15.4 15.41     O9.7V 10 0
71 Cl* NGC 2070 SMB 239 SB* 05 38 50.620 -69 05 54.56   16.12 16.07   16.12 O9.5V 9 0
72 Cl* NGC 2070 SMB 224 * 05 38 51.8138512466 -69 05 46.961743631   15.95 15.92   15.96 O9.5Vnn 12 0
73 [P93] 1696 ** 05 38 54.730 -69 03 48.85   17.08 16.68     O9.5V 7 0
74 VFTS 679 * 05 38 54.850 -69 03 50.22   16.98 16.73     O9.5V 8 0
75 VFTS 704 * 05 38 58.700 -69 02 44.74   16.69 16.76     O9.2V(n) 7 0
76 [P93] 1838 * 05 38 58.7686820398 -69 05 23.987403884   15.91 15.77     O6-7Vnnz 10 0
77 VFTS 722 * 05 39 02.7923596478 -68 57 07.876127752   14.91 15.04     O7Vnnz 8 0
78 VFTS 724 * 05 39 02.950 -69 15 00.08   17.23 16.80     O7Vnnz 7 0
79 VFTS 746 * 05 39 07.3238549996 -69 07 46.080909172   15.5 15.38     O6Vnn 7 0
80 2MASS J05390900-6901291 * 05 39 08.9950080818 -69 01 29.330785394   16.47 16.32     O7-8Vnnz 9 0
81 SSTISAGEMC J053910.91-690613.2 * 05 39 10.9162873098 -69 06 13.739889801 14.314 15.101 15.011   14.676 O3Vn((f*)) 9 0
82 VFTS 761 * 05 39 12.7301601887 -68 58 47.421401248   15.22 15.35     O6.5V((n))((f))zNstr 8 0
83 VFTS 768 * 05 39 16.2307396624 -69 01 20.392031182   16.3 16.10     O8Vn 7 0
84 IRSF J05391675-6903276 * 05 39 16.872 -69 03 27.69   15.87 15.79     O7Vnn 7 0
85 VFTS 775 * 05 39 18.8728685419 -69 14 19.468148615   17.14 16.85     O9.2V 7 0
86 IRSF J05392077-6902118 * 05 39 20.782 -69 02 11.73   16.78 16.64     O9.5V 7 0
87 VFTS 797 * 05 39 30.6377599724 -69 09 26.351856484   14.73 14.68     O3.5V((n))((fc)) 7 0
88 VFTS 849 * 05 39 47.3672382974 -68 59 22.032043314   15.06 15.14     O7Vz 8 0
89 VFTS 892 * 05 40 25.9852558004 -69 07 58.149256187   15.74 15.69     O9V 7 0
90 Cl Trumpler 14 OpC 10 43 56 -59 33.0   5.70 5.5     ~ 432 0
91 NGC 3372 HII 10 44 19.0 -59 53 21           ~ 897 2

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2020.09.28-04:20:30

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