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J/A+A/466/277       VLT-FLAMES survey of massive stars          (Hunter+, 2007)

The VLT-FLAMES survey of massive stars: surface chemical compositions of B-type stars in the Magellanic Clouds. Hunter I., Dufton P.L., Smartt S.J., Ryans R.S.I., Evans C.J., Lennon D.J., Trundle C., Hubeny I., Lanz T. <Astron. Astrophys., 466, 277-300 (2007)> =2007A&A...466..277H
ADC_Keywords: Equivalent widths ; Stars, B-type ; Abundances Keywords: stars: early-type - stars: atmospheres - stars: abundances - Magellanic Clouds - Galaxies: abundances - open clusters and associations: individual: NGC 6611, N11 and NGC 346 Abstract: We present an analysis of high-resolution FLAMES spectra of approximately 50 early B-type stars in three young clusters at different metallicities, NGC 6611 in the Galaxy, N 11 in the Large Magellanic Cloud (LMC) and NGC 346 in the Small Magellanic Cloud (SMC). Using the TLUSTY non-LTE model atmospheres code, atmospheric parameters and photospheric abundances (C, N, O, Mg and Si) of each star have been determined. These results represent a significant improvement on the number of Magellanic Cloud B-type stars with detailed and homogeneous estimates of their atmospheric parameters and chemical compositions. The relationships between effective temperature and spectral type are discussed for all three metallicity regimes, with the effective temperature for a given spectral type increasing as one moves to a lower metallicity regime. Additionally the difficulties in estimating the microturbulent velocity and the anomalous values obtained, particularly in the lowest metallicity regime, are discussed. Our chemical composition estimates are compared with previous studies, both stellar and interstellar with, in general, encouraging agreement being found. Description: Files table3.dat, table4.dat and table5.dat contain the equivalent widths and abundances estimates of the observed metal lines for B-type stars in NGC 6611, N11 and NGC 346 respectively. The equivalent widths of the spectral lines have been measured using the line fitting program ELF in the spectral analysis package DIPSO (Howarth et al., 1994, Starlink User Note, No. 50.15). The nitrogen equivalent widths and abundances are upper limits for objects N11-037, N11-047, N11-101, NGC 346-029, NGC 346-039, NGC 346-040, NGC 346-043, NGC 346-044 and NGC 346-075. table6.dat contains details of the adopted atomic data for the absorption lines considered in this analysis. Model atoms are discussed in Lanz & Hubeny (2003ApJS..146..417L) and Allende Prieto et al. (2003ApJS..147..363A), see Dufton et al. (2005, Cat. J/A+A/434/1125) for further details. Note, the loggf values of the Si II lines at 4128 and 4131 angstroms have been updated to include improved atomic data (A. Korn, private communication). Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) (files) ---------------------------------------------------------- 18 18 48. -13 49 00 NGC 6611 = M 16 (table3) 04 57 16.2 -66 23 18 IC 2116 = LHA 120-N 11A (table4) 00 59 18.0 -72 10 48 NGC 346 = LHA 115-N 66A (table5) ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 37 49 Star positions table3.dat 37 285 Equivalent Width Measurements and line-by-line abundances for NGC6611 stars table4.dat 37 1710 Equivalent Width Measurements and line-by-line abundances for N11 stars table5.dat 37 798 Equivalent Width Measurements and line-by-line abundances for NGC346 stars table6.dat 32 70 Adopted atomic data for the absorption lines considered in this analysis
See also: J/A+A/437/467 : VLT-FLAMES survey of massive stars (Evans+, 2005) J/A+A/457/265 : VLT-FLAMES Survey of massive Stars (Dufton+, 2006) J/A+A/456/623 : VLT-FLAMES survey of massive stars (Evans+, 2006) Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 12 A12 --- VName Variable name 14- 15 I2 h RAh Right ascension (J2000) 17- 18 I2 min RAm Right ascension (J2000) 20- 24 F5.2 s RAs Right ascension (J2000) 26 A1 --- DE- Declination sign (J2000) 27- 28 I2 deg DEd Declination (J2000) 30- 31 I2 arcmin DEm Declination (J2000) 33- 37 F5.2 arcsec DEs Declination (J2000)
Byte-by-byte Description of file: table[345].dat
Bytes Format Units Label Explanations
1- 12 A12 --- VName Variable name (1) 14- 19 A6 --- Species Species of the element 21 A1 --- n_Species [B] B indicates a blend of lines 23- 28 F6.1 0.1nm lambda Rest wavelength of the spectral line 30- 32 I3 0.1pm EW ?=- Equivalent width 34- 37 F4.2 [Sun] Abund ?=- Abundance of species, in [X/H]
Note (1): Corresponding Simbad designations are: NGC 6611-NNN = Cl* NGC 6611 ESL NNN N11-NNN = [ELS2006] N11 ESL NNN NGC 346-NNN = Cl* NGC 346 ESL NNN
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Species Species of the element 8- 14 F7.2 0.1nm lambda Rest wavelength of the spectral line 16- 21 F6.3 [-] loggf Oscillator strength value 23- 32 A10 --- Blends Details of lines considered as blends
Acknowledgements: Ian Hunter, i.hunter(at)qub.ac.uk
(End) Ian Hunter [QUB, United Kingdom], Patricia Vannier [CDS] 10-May-2007
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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