J/A+A/496/841 VLT-FLAMES survey of massive stars (Hunter+, 2009)
The VLT-FLAMES survey of massive stars: constraints on stellar evolution from
the chemical compositions of rapidly rotating Galactic and Magellanic Cloud
B-type stars.
Hunter I., Brott I., Langer N., Lennon D.J., Dufton P.L., Howarth I.D.,
Ryans R.S.I., Trundle C., Evans C.J., De Koter A., Smartt S.J.
<Astron. Astrophys., 496, 841-853 (2009)>
=2009A&A...496..841H 2009A&A...496..841H
ADC_Keywords: Clusters, open ; Stars, early-type ; Abundances
Keywords: stars: early-type - stars: atmospheres - stars: rotation -
stars: abundances - stars: evolution - galaxies: Magellanic Clouds
Abstract:
We have previously analysed the spectra of 135 early B-type stars in
the Large Magellanic Cloud (LMC) and found several groups of stars
that have chemical compositions that conflict with the theory of
rotational mixing. Here we extend this study to Galactic and Small
Magellanic Cloud (SMC) metallicities.
We provide chemical compositions for ∼50 Galactic and ∼100 SMC early
B-type stars and compare these to the LMC results. These samples cover
a range of projected rotational velocities up to ∼300km/s and hence
are well suited to testing rotational mixing models. The surface
nitrogen abundances are utilised as a probe of the mixing process
since nitrogen is synthesized in the core of the stars and mixed to
the surface.
Description:
The majority of the data were obtained using the Fibre Large Array
Multi-Element Spectrograph (FLAMES) on the 8.2m European Southern
Observatory Very Large Telescope (ESO-VLT) at Paranal, Chile. These
data were supplemented by UVES and FEROS observations of the brighter
targets. Approximately 300 Galactic objects were observed and these
are associated with the clusters NGC 6611, NGC 3293 and NGC 4755.
The observations have been described in detail in Paper I (Evans
et al., 2005, Cat. J/A+A/437/467) and Paper II (Evans et al., 2006,
Cat. J/A+A/456/623).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 40 15158 Equivalent width measurements and derived abundances
for the metal lines observed in the spectra of
our sample stars
table2.dat 92 291 Atmospheric parameters, projected rotational
velocities and chemical compositions of the sample
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See also:
J/A+A/437/467 : VLT-FLAMES survey of massive stars (Evans+, 2005)
J/A+A/456/623 : VLT-FLAMES survey of massive stars (Evans+, 2006)
J/A+A/457/265 : VLT-FLAMES survey of massive stars (Dufton+, 2006)
J/A+A/466/277 : VLT-FLAMES survey of massive stars (Hunter+, 2007)
J/A+A/471/625 : VLT-FLAMES survey of massive stars (Trundle+, 2007)
J/A+A/479/541 : VLT-FLAMES survey of massive stars (Hunter+, 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Source name
15- 20 A6 --- El Element
22- 28 F7.2 0.1nm lambda Wavelength
30 A1 --- l_EW Limit flag on EW
31- 33 I3 0.1nm EW ?=- Equivalent width
36 A1 --- l_N Limit flag on N
37- 40 F4.2 ---- N ?=- Abundance
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Source name (1)
14- 18 I5 K Teff Effective temperature (2)
20- 23 F4.2 [cm/s2] logg Surface gravity (2)
25- 26 I2 km/s vt ?=- Microturbulent velocity (2)
28- 30 I3 km/s vsini Projected rotational velocity (2)
32- 35 F4.2 --- C ?=- Carbon abundance (log(H)=12) (3)
37- 40 F4.2 --- e_C ? rms uncertainty on C
42 I1 --- o_C ? Number of lines observed for C abundance
44 A1 --- l_N Limit flag on N abundance
45- 48 F4.2 --- N ?=- Nitrogen abundance (log(H)=12) (3)
50- 53 F4.2 --- e_N ? rms uncertainty on N
55 I1 --- o_N ? Number of lines observed for N abundance
57- 60 F4.2 --- O ?=- Oxygen abundance (log(H)=12) (3)
62- 65 F4.2 --- e_O ? rms uncertainty on O
67- 68 I2 --- o_O ? Number of lines observed for O abundance
70- 73 F4.2 --- Mg ?=- Magnesium abundance (log(H)=12) (3)
75- 78 F4.2 --- e_Mg ? rms uncertainty on Mg
80 I1 --- o_Mg ? Number of lines observed for Mg abundance
82- 85 F4.2 --- Si ?=- Silicon abundance (log(H)=12) (3)
87- 90 F4.2 --- e_Si ? rms uncertainty on Si
92 I1 --- o_Si ? Number of lines observed for Si abundance
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Note (1): Alternative stellar identifiers can be found in Papers I
(Cat. J/A+A/437/467) and II (Cat. J/A+A/456/623).
Note (2): The atmospheric parameters and rotational velocities are taken
from Papers III (Cat. J/A+A/457/265) and IV (Cat. J/A+A/466/277).
Note (3): Abundances are presented on the scale 12+log[X/H]. A correction
has been applied to the carbon abundances.
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History:
From electronic version of the journal
References:
Evans et al., Paper I 2005A&A...437..467E 2005A&A...437..467E, Cat. J/A+A/437/467
Evans et al., Paper II 2006A&A...456..623E 2006A&A...456..623E, Cat. J/A+A/456/623
Dufton et al., Paper III 2006A&A...457..265D 2006A&A...457..265D, Cat. J/A+A/457/265
Hunter et al., Paper IV 2007A&A...466..277H 2007A&A...466..277H, Cat. J/A+A/466/277
Trundel et al., Paper V 2007A&A...471..625T 2007A&A...471..625T, Cat. J/A+A/471/625
Hunter et al., Paper VI 2008A&A...479..541H 2008A&A...479..541H, Cat. J/A+A/479/541
(End) Patricia Vannier [CDS] 26-Apr-2009