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J/A+A/601/A79     VLTS. Properties of O dwarf in 30 Dor (Sabin-Sanjulian+, 2017)

The VLT-FLAMES Tarantula Survey. XXVI: Properties of the O-dwarf population in 30 Doradus. Sabin-Sanjulian C., Simon-Diaz S., Herrero A., Puls J., Schneider F.R.N., Evans C.J., Garcia M., Najarro F., Brott I., Castro N., Crowther P.A., de Koter A., de Mink S.E., Grafener G., Grin N.J., Holgado G., Langer N., Lennon D.J., Maiz Apellaniz J., Ramirez-Agudelo O.H., Sana H., Taylor W.D., Vink J.S., Walborn N.R. <Astron. Astrophys. 601, A79 (2017)> =2017A&A...601A..79S (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Stars, O ; Stars, dwarfs ; Rotational velocities ; Effective temperatures Keywords: Magellanic Clouds - stars: atmospheres - stars: early-type - stars: fundamental parameters - stars: massive Abstract: The VLT-FLAMES Tarantula Survey has observed hundreds of O-type stars in the 30 Doradus region of the Large Magellanic Cloud (LMC). We study the properties of 105 apparently single O-type dwarfs. To determine stellar and wind parameters, we used the IACOB-GBAT package, an automatic procedure based on a large grid of atmospheric models calculated with the FASTWIND code. In addition to classical techniques, we applied the Bayesian BONNSAI tool to estimate evolutionary masses. We provide a new calibration of effective temperature vs. spectral type for O-type dwarfs in the LMC, based on our homogeneous analysis of the largest sample of such objects to date and including all spectral subtypes. Good agreement with previous results is found, although the sampling at the earliest subtypes could be improved. Rotation rates and helium abundances are studied in an evolutionary context. We find that most of the rapid rotators (vsini higher than 300km/s) in our sample have masses below 25 MSun and intermediate rotation-corrected gravities (loggc between 3.9 and 4.1). Such rapid rotators are scarce at higher gravities (i.e. younger ages) and absent at lower gravities (larger ages). This is not expected from theoretical evolutionary models, and does not appear to be due to a selection bias in our sample. We compare the estimated evolutionary and spectroscopic masses, finding a trend that the former is higher for masses below 20M. This can be explained as a consequence of limiting our sample to the O-type stars, and we see no compelling evidence for a systematic mass discrepancy. For most of the stars in the sample we were unable to estimate the wind-strength parameter (hence mass-loss rates) reliably, particularly for objects with luminosity lower than logL/L about 5.1. Ultraviolet spectroscopy is needed to undertake a detailed investigation of the wind properties of these dwarfs. Description: Results from the quantitative spectroscopic analysis of 105 O-type dwarfs belonging to the 30 Doradus region in the LMC are presented. Stellar and wind parameters, as well as stellar radii, luminosities and masses are given. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 88 85 Stellar and wind parameters for stars analyzed with HHe diagnostics tablea2.dat 64 20 *First estimates of stellar and wind parameters for stars analyzed with HHeN diagnostics tableb1.dat 107 85 Radii, luminosities and masses for stars analyzed with HHe diagnostics tableb2.dat 84 20 First estimates of radii, luminosities and masses for stars analyzed with HHeN diagnostics
Note on tablea2.dat: Y(He) was fixed to 0.10±0.02.
See also: J/A+A/530/A108 : VLT-FLAMES Tarantula Survey (Evans+, 2011) J/A+A/550/A107 : VLTS. RV catalogue of O stars in 30 Doradus (Sana+, 2013) J/A+A/550/A108 : DIB in VLT-FLAMES Tarantula Survey (van Loon+, 2013) J/A+A/550/A109 : VLTS: vsini measures (Dufton+ 2013) J/A+A/558/A134 : VLTS. 30 Dor luminous stars (Doran+, 2013) J/A+A/560/A29 : O-stars in VLT-FLAMES Tarantula Survey (Ramirez-Agudelo+ 2013) J/A+A/564/A39 : VLTS. OVz stars in 30 Dor (Sabin-Sanjulian+, 2014) J/A+A/564/A40 : VFTS. O-type stellar content of 30 Dor (Walborn+, 2014) J/A+A/564/L7 : VLT-FLAMES Tarantula Survey: VFTS 822 (Kalari+, 2014) J/A+A/575/A70 : VFTS. B-type supergiants (McEvoy+, 2015) J/A+A/580/A93 : VLTS. B stars multiplicity (Dunstall+, 2015) Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- VFTS VLT-FLAMES Tarantula Survey identifier (2011A&A...530A.108E) 5- 21 A17 --- SpType Spectral classification 23- 25 I3 km/s vsini Projected rotational velocity 27- 31 I5 K Teff Effective temperature 33- 36 I4 K e_Teff Mean error on effective temperature 38- 41 F4.2 [cm/s2] logg Surface gravity 43 A1 --- n_logg [*] Note on logg (1) 45- 48 F4.2 [cm/s2] loggc ? Rotation-corrected gravity (G1) 50- 53 F4.2 [cm/s2] e_loggc Mean error on gravity (minimum of 0.10) 55 A1 --- l_Y(He) Limit flag on Y(He) 57- 60 F4.2 --- Y(He) Helium abundance N(He)/N(H) (error=0.02) 62 A1 --- l_logQ Limit flag on logQ 64- 68 F5.1 --- logQ Wind-strength parameter (2) 70- 72 F3.1 --- e_logQ ? Mean error on logQ 74 A1 --- l_logDmom Limit flag on logDmom 76- 79 F4.1 --- logDmom ? Wind momentum (error=0.4) 81- 88 A8 --- Comm Comments regarding possible binarity or multiplicity (G2)
Note (1): * for stars with too high gravity (larger than 4.2 dex). Note (2): Q=(dM/dt)/(vinfR*)^3/2, where dM/dt is the mass-loss rate and vinf the terminal wind velocity and R the stellar radius.
Byte-by-byte Description of file: tablea2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- VFTS VLT-FLAMES Tarantula Survey identifier (2011A&A...530A.108E) 5- 22 A18 --- SpType Spectral classification 24- 26 I3 km/s vsini Projected rotational velocity 28- 32 I5 K Teff Effective temperature (adopted error of 1500K) 34- 37 F4.2 [cm/s2] logg Surface gravity (adopted error of 0.1) 39- 42 F4.2 [cm/s2] loggc Rotation-corrected gravity (G1) 44 A1 --- l_logQ Limit flag on logQ 46- 50 F5.1 --- logQ Wind-strength parameter (adopted error of 0.20) 52 A1 --- l_logDmom Limit flag on logDmom 54- 57 F4.1 --- logDmom Wind momentum (error=0.4) 59- 64 A6 --- Comm Comments regarding possible binarity or multiplicity (G2)
Byte-by-byte Description of file: tableb1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- VFTS VLT-FLAMES Tarantula Survey identifier (2011A&A...530A.108E) 5- 21 A17 --- SpType Spectral classification 23- 27 I5 K Teff Effective temperature 29- 32 F4.2 [cm/s2] loggc ? Rotation-corrected gravity (G1) 34- 38 F5.2 mag VMag ? Absolute magnitude in V (G3) 40- 44 F5.2 Rsun R ? Stellar radius 46- 49 F4.2 Rsun e_R ? Mean error in R 51- 54 F4.2 [Lsun] logL ? Stellar luminosity 56- 59 F4.2 [Lsun] e_logL ? Mean error in logL 61- 64 F4.1 Msun Msp ? Spectroscopic mass 66- 69 F4.1 Msun e_Msp ? Mean error in Msp 71- 74 F4.1 Msun Mev(GT) ? Evolutionary mass from Kiel diagram 76- 79 F4.1 Msun e_Mev(GT) ? Mean error on Mev(GT) 81- 84 F4.1 Msun Mev(LT) ? Evolutionary mass from HR diagram 86- 89 F4.1 Msun e_Mev(LT) ? Mean error on Mev(LT) 91- 94 F4.1 Msun Mev(B) ? Evolutionary mass from BONNSAI (Schneider et al., 2014A&A...570A..66S) 96- 98 F3.1 Msun e_Mev(B) ? Mean error in Mev(B) 100-107 A8 --- Comm Comments regarding possible binarity or multiplicity (G2)
Byte-by-byte Description of file: tableb2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- VFTS VLT-FLAMES Tarantula Survey identifier (2011A&A...530A.108E) 5- 22 A18 --- SpType Spectral classification 24- 28 I5 K Teff Effective temperature 30- 33 F4.2 [cm/s2] loggc Rotation-corrected gravity (G1) 35- 39 F5.2 mag VMag Absolute magnitude in V (G3) 41- 45 F5.2 Rsun R Stellar radius 47- 50 F4.2 [Lsun] logL Stellar luminosity 52- 56 F5.1 Msun Msp Spectroscopic mass 58 A1 --- l_Mev(GT) ? Limit flag on Mev(GT) 60- 62 I3 Msun Mev(GT) Evolutionary mass from Kiel diagram 64- 66 I3 Msun Mev(LT) Evolutionary mass from HR diagram 68- 72 F5.1 Msun Mev(B) Evolutionary mass from BONNSAI ( Schneider et al., 2014A&A...570A..66S) 74- 77 F4.1 Msun e_Mev(B) Mean error in Mev(B) 79- 84 A6 --- Comm Comments regarding possible binarity or multiplicity (G2)
Global notes: Note (G1): loggc=log[g+(vsini)2/R], with R the stellar radius. See Herrero et al. (1992A&A...261..209H) and Repolust et al. (2004A&A...415..349R). Note (G2): Relevant comments from Table 1 in Walborn et al., 2014A&A...564A..40W. Note (G3): Absolute magnitudes in the V-band from Maiz Apellaniz et al. (2014A&A...564A..63M)
Acknowledgements: Carolina Sabin-Sanjulian, cssj(at)dfuls.cl References: Evans et al., Paper I 2011A&A...530A.108E, Cat. J/A+A/530/108 Taylor et al., Paper II 2011A&A...530L..10T Bestenlehner et al., Paper III 2011A&A...530L..14B Bressert et al., Paper IV 2012A&A...542A..49B Dunstall et al., Paper V 2012A&A...542A..50D Henault-Brunet et al., Paper VI 2012A&A...545L...1H Henault-Brunet et al., Paper VII 2012A&A...546A..73H Sana et al., Paper VIII 2013A&A...550A.107S, Cat. J/A+A/550/A107 van Loon et al., Paper IX 2013A&A...550A.108V, Cat. J/A+A/550/A108 Dufton et al., Paper X 2013A&A...550A.109D, Cat. J/A+A/550/A109 Doran et al., Paper XI 2013A&A...558A.134D, Cat. J/A+A/558/A134 Ramirez-Agudelo et al., Paper XII 2013A&A...560A..29R, Cat. J/A+A/560/A29 Sabin-Sanjulian et al., Paper XIII 2014A&A...564A..39S, Cat. J/A+A/564/A39 Walborn et al., Paper XIV 2014A&A...564A..40W, Cat. J/A+A/564/A40 Kalari et al., Paper XV 2014A&A...564L...7K, Cat. J/A+A/564/L7 Maiz Apellaniz et al., Paper XVI 2014A&A...564A..63M Bestenlehner et al., Paper XVII 2014A&A...570A..38B Evans et al., Paper XVIII 2015A&A...574A..13E McEvoy et al., Paper XIX 2015A&A...575A..70M, Cat. J/A+A/575/A70 Clark et al., Paper XX 2015A&A...579A.131C Ramirez-Agudelo et al., Paper XXI 2015A&A...580A..92R Dunstall et al., Paper XXII 2015A&A...580A..93D, Cat. J/A+A/580/A93 Howarth et al., Paper XXIII 2015A&A...582A..73H
(End) C. Sabin-Sanjulian [ULS, Chile] , Patricia Vannier [CDS] 13-Mar-2017
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