J/A+A/564/A40 VFTS. O-type stellar content of 30 Dor (Walborn+, 2014)
The VLT-FLAMES Tarantula Survey. XIV. The O-type stellar content of 30 Doradus.
Walborn N.R., Sana H., Simon-Diaz S., Maiz Apellaniz J., Taylor W.D.,
Evans C.J., Markova N., Lennon D.J., de Koter A.
<Astron. Astrophys., 564, A40-40 (2014)>
=2014A&A...564A..40W 2014A&A...564A..40W
ADC_Keywords: Magellanic Clouds ; Stars, O ; MK spectral classification
Keywords: stars: early-type - stars: fundamental parameters - stars: massive -
galaxies: star clusters: individual: 30 Doradus - Magellanic Clouds
Abstract:
Detailed spectral classifications are presented for 352 O-B0 stars in
the VLT-FLAMES Tarantula Survey ESO Large Programme, of which 213
O-type are judged of sufficiently high quality for further
morphological analysis. Among them, six subcategories of special
interest are distinguished. (1) Several new examples of the earliest
spectral types O2-O3 have been found, while a previously known example
has been determined to belong to the nitrogen-rich ON2 class. (2) A
group of extremely rapidly rotating main-sequence objects has been
isolated, including the largest vsini values known, the spatial and
radial-velocity distributions of which suggest ejection from the two
principal ionizing clusters NGC 2070 and NGC 2060. (3) Several new
examples of the evolved, rapidly rotating Onfp class show similar
evidence, although at least some of them are spectroscopic binaries.
(4) No fewer than 48 members of the Vz category, hypothesized to be on
or near the zero-age main sequence, are found in this sample; in
contrast to the rapid rotators, they are strongly concentrated to the
ionizing clusters and a newly recognized region of current and recent
star formation to the north, supporting their interpretation as very
young objects, as do their relatively faint absolute magnitudes. (5) A
surprisingly large fraction of the main-sequence spectra belong to the
recently recognized V((fc)) class, with CIII emission lines of similar
strength to the usual NIII in V((f)) spectra, although a comparable
number of the latter are also present, as well as six objects with
very high-quality data but no trace of either emission feature,
presenting new challenges to physical interpretations. (6) Two mid-O
Vz and three late-O giant/supergiant spectra with morphologically
enhanced nitrogen lines have been detected. Absolute visual magnitudes
have been derived for each star with individual extinction laws, and
composite Hertzsprung-Russell diagrams provide evidence of the
multiple generations present in this field. Spectroscopic binaries,
resolved visual multiples, and possible associations with X-ray
sources are noted. Astrophysical and dynamical analyses of this unique
dataset underway will provide new insights into the evolution of
massive stars and starburst clusters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 176 213 AAA-rated spectral classifications and
supporting data for 213 VFTS O stars
tablea1.dat 211 139 BBB-rated spectral classifications and
supporting data for 139 VFTS O-B0 stars
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See also:
J/A+A/530/A108 : VLT-FLAMES Tarantula Survey (Evans+, 2011)
J/A+A/550/A107 : RV catalogue of O stars in 30 Doradus (Sana+, 2013)
J/A+A/550/A108 : DIB in VLT-FLAMES Tarantula Survey (van Loon+, 2012)
J/A+A/550/A109 : VLT-FLAMES Tarantula Survey: vsini measures (Dufton+ 2013)
J/A+A/558/A134 : VFTS. 30 Dor luminous stars (Doran+, 2013)
J/A+A/560/A29 : VFTS. O stars Vrot (Ramirez-Agudelo+, 2013)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- VFTS [12/892] VFTS number identifier
5- 38 A34 --- SpType Spectral type
41- 45 F5.2 mag Vmag ?=- V magnitude
47- 51 F5.2 mag B-V ?=- B-V colour index
53- 57 F5.2 mag VMAG ?=- Absolute V magnitude
59- 63 I5 K Teff ?=- Effective temperature
65- 70 E6.3 Lsun Lum ?=- Luminosity
72- 73 A2 --- HRD [012y ] HR diagram (HRD) status (1)
75- 83 A9 --- Mult Multiplicity code (G2)
85- 96 A12 --- AltID Altenative name(s) (G3)
98-176 A79 --- Com Comment
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Note (1): HRD column codes:
0 = not included in the HRDs (Sect. 4) because of no or uncertain luminosity
class, visual multiplicity, no photometry or poor SED fit (33 stars)
1 = and 2: included in the HRDs (180 stars)
2 = within 80pc projected of R136 (117 stars)
y = age≤2.5Myr per HRD (55 stars)
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- VFTS [17/887] VFTS number (1)
5- 44 A40 --- SpType Spectral type
47- 55 A9 --- Mult Multiplicity code (G2)
58- 69 A12 --- AltID Altenative name(s) (G3)
71-211 A141 --- Com Comment
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Note (1): 96/139 stars have multiplicity flags. The SB2 have been classified by
JMA with MGB. There are 10 B0 stars, of which one is a supergiant. The
"SiIV weak" spectra are further discussed in the text. Because of the very
steep spectral-type dependence of the luminosity criteria at the O-B0
boundary, HeII λ4686/HeI λ4713 of or near unity implies class II
at O9.7 but V-IV at B0; also, metallicity affects the sensitive
SiIII λ4552/HeII λ4541 spectral-type criterion, a value of or
near unity defining type O9.7.
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Global notes:
Note (G2): Multiplicity codes are:
SB = spectroscopic binary
SB1 = single lined
SB2 = double lined
l = large amplitude (>20km/s)
s = small amplitude (10-20km/s)
vs = very small amplitude (<10km/s)
SB? = stellar absorption displaced from nebular emission lines but no
radial-velocity variation measured
VMn = visual multiple of n components within 1.2" Medusa fiber, as
determined in HST/WFC3 image
NC = no WFC3 coverage
In table2, 140/213 stars have SB, VM, or both entries; moreover, multiples
with separations between about 5000AU and 1AU (or less than the latter with
unfavorable inclinations) would not, in general, be detected by either
technique, except that some SB? may be within that gap. On the other hand,
some SB? may instead have high velocities relative to the gas.
Note (G3): Alternate ID column sources:
ST1 = Schild & Testor (1992A&AS...92..729S 1992A&AS...92..729S), <[ST92] N-NNN> in Simbad
BI = Brunet et al. (1975A&AS...21..109B 1975A&AS...21..109B), in Simbad
T88 = Testor et al. (1988Msngr..54...43T 1988Msngr..54...43T), <[TLD88] NN> in Simbad
Mk = Melnick (1985A&A...153..235M 1985A&A...153..235M), <Cl* NGC 2070 Mel NNW> in Simbad
P = Parker (1993AJ....106..560P 1993AJ....106..560P)
R = Feast et al. (1960MNRAS.121..337F 1960MNRAS.121..337F)
Sk = Sanduleak (1970CoTol..89....1S 1970CoTol..89....1SA), <Sk -DD NNNA> in Simbad
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History:
From electronic version of the journal
References:
Evans et al., Paper I 2011A&A...530A.108E 2011A&A...530A.108E, Cat. J/A+A/530/108
Taylor et al., Paper II 2011A&A...530L..10T 2011A&A...530L..10T
Bestenlehner et al., Paper III 2011A&A...530L..14B 2011A&A...530L..14B
Bressert et al., Paper IV 2012A&A...542A..49B 2012A&A...542A..49B
Dunstall et al., Paper V 2012A&A...542A..50D 2012A&A...542A..50D
Henault-Brunet et al., Paper VI 2012A&A...545L...1H 2012A&A...545L...1H
Henault-Brunet et al., Paper VII 2012A&A...546A..73H 2012A&A...546A..73H
Sana et al. Paper VIII 2013A&A...550A.107S 2013A&A...550A.107S, Cat. J/A+A/550/A107
Van Loon et al. Paper IX 2013A&A...550A.108V 2013A&A...550A.108V, Cat. J/A+A/550/A108
Dufton et al., Paper X 2013A&A...550A.109D 2013A&A...550A.109D, Cat. J/A+A/550/A109
Doran et al., Paper XI 2013A&A...558A.134D 2013A&A...558A.134D, Cat. J/A+A/558/A134
Ramirez-Agudelo et al., Paper XII 2013A&A...560A..29R 2013A&A...560A..29R, Cat. J/A+A/560/A29
Sabin-Sanjulian et al., Paper XIII 2014A&A...564A..39S 2014A&A...564A..39S
Kalari et al., Paper XV 2014A&A...564L...7K 2014A&A...564L...7K
Maiz Apellaniz et al., Paper XVI 2014A&A...564A..63M 2014A&A...564A..63M
(End) Patricia Vannier [CDS] 04-Jun-2014