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J/A+A/539/A143   Nearby B-stars stellar parameters and abundances (Nieva+, 2012)

Present-day cosmic abundances. A comprehensive study of nearby early B-type stars and implications for stellar and Galactic evolution, and interstellar dust models. Nieva M.F., Przybilla N. <Astron. Astrophys. 539, A143 (2012)> =2012A&A...539A.143N
ADC_Keywords: Stars, B-type ; Stars, nearby ; Abundances ; Effective temperatures ; Stars, distances Keywords: stars: abundances - stars: early-type - stars: fundamental parameters - stars: evolution - ISM: abundances - Galaxy: evolution Abstract: Early B-type stars are ideal indicators for present-day cosmic abundances since they preserve their pristine abundances and typically do not migrate far beyond their birth environments over their short lifetimes, in contrast to older stars like the Sun. They are also unaffected by depletion onto dust grains, unlike the cold/warm interstellar medium (ISM) or HII regions. A carefully selected sample of early B-type stars in OB associations and the field within the solar neighbourhood is studied comprehensively. Quantitative spectroscopy is used to characterise their atmospheric properties in a self-consistent way. Present-day abundances for the astrophysically most interesting chemical elements are derived in order to investigate whether a present-day cosmic abundance standard can be established. Description: Stellar parameters and elemental abundances for a sample of 20 sharp-lined early B-type stars in the solar vicinity are presented. High-resolution and high-S/N FOCES, FEROS and ELODIE spectra were investigated using sophisticated non-LTE modelling and a comprehensive analysis methodology. Independent indicators like multiple ionization equilibria, the Stark-broadened hydrogen Balmer line profiles and large numbers of helium and metal lines were reproduced simultaneously. Precise and accurate data on effective temperatures, surface gravities, microturbulent, macroturbulent and projected rotational velocities, color excesses, intrinsic V magnitudes, evolutionary masses, spectroscopic distances and distances from Hipparcos parallaxes, and elemental abundances for carbon, nitrogen, oxygen, neon, magnesium, silicon and iron are summarised in the tables. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table5.dat 98 20 Stellar parameters for the sample stars table6.dat 109 20 Metal abundances for the sample stars
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Sequential number 4- 11 A8 --- Name Object name 14- 18 I5 K Teff Effective temperature 20- 22 I3 K e_Teff Mean error on effective temperature 25- 28 F4.2 [cm/s2] logg Surface gravity 30- 33 F4.2 [cm/s2] e_logg Mean error on surface gravity 36 I1 km/s xi Microturbulent velocity 38 I1 km/s e_xi Mean error on microturbulent velocity 41- 42 I2 km/s vsini Projected rotational velocity 44 I1 km/s e_vsini Mean error on projected rotational velocity 47- 48 I2 km/s zeta ? radial-tangential macroturbulent velocity 50 I1 km/s e_zeta ? Mean error on macroturbulent velocity 53- 56 F4.2 mag E(B-V) Colour excess 58- 61 F4.2 mag e_E(B-V) Mean error on colour excess 64- 67 F4.2 mag Vmag0 Intrinsic magnitude (apparent) in V filter 69- 72 F4.2 mag e_Vmag0 Mean error on intrinsic V magnitude 75- 78 F4.1 solMass Mevol Evolutionary Mass 80- 82 F3.1 solMass e_Mevol Mean error on evolutionary mass 85- 87 I3 pc dists Spectroscopic distance 89- 90 I2 pc e_dists Mean error on spectroscopic distances 93- 95 I3 pc distH ? Hipparcos distance 97- 98 I2 pc e_distH ? Mean error on Hipparcos distance
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Sequential number 4- 11 A8 --- Name Object name 14- 17 F4.2 [---] C Carbon abundance (1) 19- 22 F4.2 [---] e_C Mean error on C abundance 24- 25 I2 --- o_C Number of lines analysed for C abundance 28- 31 F4.2 [---] N Nitrogen abundance (1) 33- 36 F4.2 [---] e_N Mean error on N abundance 38- 39 I2 --- o_N Number of lines analysed for N abundance 42- 45 F4.2 [---] O Oxygen abundance (1) 47- 50 F4.2 [---] e_O Mean error on O abundance 52- 53 I2 --- o_O Number of lines analysed for O abundance 56- 59 F4.2 [---] Ne Neon abundance (1) 61- 64 F4.2 [---] e_Ne Mean error on Ne abundance 66- 67 I2 --- o_Ne Number of lines analysed for Ne abundance 70- 73 F4.2 [---] Mg Magnesium abundance (1) 75- 78 F4.2 [---] e_Mg ? Mean error on Mg abundance 80- 81 I2 --- o_Mg Number of lines analysed for Mg abundance 84- 87 F4.2 [---] Si Silicon abundance (1) 89- 92 F4.2 [---] e_Si Mean error on Si abundance 94- 95 I2 --- o_Si ? Number of lines analysed for Si abundance 98-101 F4.2 [---] Fe Iron abundance (1) 103-106 F4.2 [---] e_Fe Mean error on Fe abundance 108-109 I2 --- o_Fe Number of lines analysed for Fe abundance
Note (1): Abundances are presented on the scale 12+log[X/H].
Acknowledgements: Maria-Fernanda Nieva, nieva(at)
(End) N. Przybilla [Univ. Erlangen-Nuremberg], P. Vannier [CDS] 23-Jan-2012
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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