Access to Astronomical Catalogues

← Click to display the menu
J/A+A/613/A65       Spectroscopic parameters of O-type stars    (Holgado+, 2018)

The IACOB project. V. Spectroscopic parameters of the O-type stars in the modern grid of standards for spectral classification. Holgado G., Simon-Diaz S., Barba R.H., Puls J., Herrero A., Castro N., Garcia M., Maiz Apellaniz J., Negueruela I., Sabin-Sanjulian C. <Astron. Astrophys. 613, A65 (2018)> =2018A&A...613A..65H (SIMBAD/NED BibCode)
ADC_Keywords: Stars, O ; Spectroscopy Keywords: stars: early-type - stars: fundamental parameters - techniques: spectroscopic - catalogs - Galaxy: general Abstract: The IACOB and OWN surveys are two ambitious complementary observational projects which have made available a large multi-epoch spectroscopic database of optical high resolution spectra of Galactic massive O-type stars. As a first step in the study of the full sample of (more than 350) O stars surveyed by the IACOB and OWN projects, we have performed the quantitative spectroscopic analysis of a subsample of 128 stars included in the modern grid of O-type standards for spectral classification. The sample comprises stars with spectral types in the range O3-O9.7 and covers all luminosity classes. We use the semi-automatized iacob-broad and iacob-gbat/fastwind tools to determine the complete set of spectroscopic parameters that can be obtained from the optical spectrum of O-type stars. A quality flag is assigned to the outcome of the iacob- gbat/fastwind analysis for each star, based on a visual evaluation of how the synthetic spectrum of the best fitting fastwind model reproduces the observed spectrum. We also benefit from the multi-epoch character of the IACOB and OWN surveys to perform a spectroscopic variability study of the complete sample, providing two different flags for each star accounting for spectroscopic binarity as well as variability of the main wind diagnostic lines. Description: Complete list of stars considered standards O-type stars for spectral classification. We performed an exhaustive search for spectra of these stars in modern high resolution spectroscopic databases. The spectrum with best quality, in terms of signal-to-noise ratio, was considered for the quantitative spectroscopic analysis and a multi-epoch characterization. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tabled1.dat 158 131 Complete list of stars considered in this work tabled2.dat 128 131 Spectroscopic parameters for the complete sample of stars
See also: III/252 : Pulkovo radial velocities for 35493 HIP stars (Gontcharov, 2006) III/254 : 2nd Cat. of Radial Velocities with Astrometric Data (Kharchenko+, 2007) Byte-by-byte Description of file: tabled1.dat
Bytes Format Units Label Explanations
1- 17 A17 --- Target Name of the star 21- 34 A14 --- OName Alternative name of the star 36- 39 A4 --- SpType Spectral type 41- 45 A5 --- LumClass Luminosity class 47- 49 I3 --- NOT Number of available spectra with NOT 51- 53 I3 --- Mercator Number of available spectra with Mercator 55- 56 I2 --- FEROS/MPI2.2 Number of available spectra with FEROS 58- 59 I2 --- CAFE Number of available spectra with CAFE 61- 97 A37 --- SpecUsed Spectra used in the analysis 99-106 F8.3 d JD ?=- Julian date (JD-2450000) 108-110 I3 --- S/Nc ?=0 Signal-to-noise of the continuum 112-129 A18 --- Line Line used for the broadening parameter 131-133 I3 --- S/Nl ?=- Signal-to-noise of the line 135-137 I3 0.1pm EW ?=- Equivalent width of the line (mÅ) 139-142 I4 km/s RV ?=- Radial velocity 144 I1 km/s e_RV ? rms uncertainty on RV 146-151 F6.1 km/s RVlit ?=- Radial velocity in literature 153-156 F4.1 km/s e_RVlit ? rms uncertainty on RVlit 157-158 A2 --- r_RVlit [* ] Reference for RVlit (1)
Note (1): References as follows: * = Values from Gontcharov et al. (2006AstL...32..759G, Cat. III/252) ** = Values from Kharchenko et al. (2007AN....328..889K, Cat. III/254)
Byte-by-byte Description of file: tabled2.dat
Bytes Format Units Label Explanations
1- 17 A17 --- Target Name of the star 18 A1 --- n_Target [a] Note (1) 20- 24 A5 --- SpType Spectral type 26- 36 A11 --- LumClass Luminosity class 38- 40 I3 km/s vsini ?=- Projected rotational velocity 42- 44 I3 km/s vmac ?=- Macroturbulent velocity 46 A1 --- l_Teff Limit flag on Teff 47- 50 F4.1 kK Teff ?=- Effective temperature 52- 54 F3.1 kK e_Teff ? rms uncertainty on Teff 56 A1 --- l_logg Limit flag on logg 57- 60 F4.2 [cm/s2] logg ?=- logarithm of the surface gravity 62- 65 F4.2 [cm/s2] e_logg ? rms uncertainty on logg 67 A1 --- l_loggt Limit flag on loggt 68- 71 F4.2 [cm/s2] loggt ?=- Gravity corrected from rotational effects (2) 73- 76 F4.2 [cm/s2] e_loggt ? rms uncertainty on loggt 78 A1 --- l_Y(He) Limit flag on Y(He) 79- 82 F4.2 [-] Y(He) ?=- Helium abundance 84- 87 F4.2 [-] e_Y(He) ? rms uncertainty on Y(He) 89 A1 --- l_vmic Limit flag on vmic 90- 93 F4.1 km/s vmic ?=- Microturbulence velocity or lower value of microturbulence velocity interval 96 I1 km/s e_vmic ? rms uncertainty on vmic 97 A1 --- --- [-] 98-101 F4.1 km/s Bvmic ? Upper value of microturbulence velocity interval 103 A1 --- l_logQ Limit flag on logQ 104-108 F5.1 --- logQ ?=- Wind-strength parameter 110-112 F3.1 --- e_logQ ? rms uncertainty on logQ 114-115 A2 --- Qual Quality flag (Q1-Q4) (3) 117-123 A7 --- Notes Multi-epoch notes (4) 125-128 A4 --- OWNNote OWN multi-epoch notes (4)
Note (1): Note as follows: a = For these three stars the luminosity class has changed from III to IV in the new GOSSS OB2500 v3.0 grid of standards (Maiz Apellaniz et al., 2016ApJS..224....4M) Note (2): gtrue=g+gcent, gcent~(Vrot*sini)2)/R* Note (3): Quality flag as follows: Q1 = acceptable fit with no major remarks, Q2 = HeII λ4686 appearing in the observed spectrum as an inverse P-Cygni profile or showing a double peak Q3 = Hα and HeII λ4686 not fitting at the same time Q4 = no HeI available to properly constrain the effective temperature of the star Note (4): Notes as follows: C = Constant LPV = Line profile variability WVa = Wind variable WVe = Wind variable MD0 = More Data needed, only 0 spectra available MD1 = More Data needed, only 1 spectra available MD2 = More Data needed, only 2 spectra available SB1 = single-line eclipsing binary SB2 = double-line eclipsing binary VAR = Variable VAR? = Variable ?
Acknowledgements: Gonzalo Holgado, gholgado(at)iac.es References: Simon-Diaz & Herrero, Paper I 2014A&A...562A.135S, Cat. J/A+A/562/A135 Simon-Diaz et al., Paper II 2014A&A...570L...6S Simon-Diaz et al., Paper III 2017A&A...597A..22S, Cat. J/A+A/597/A22 Godart et al., Paper IV 2017A&A...597A..23G
(End) Gonzalo Holgado [Univ. La Laguna], Patricia Vannier [CDS] 30-Nov-2017
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

catalogue service

© Université de Strasbourg/CNRS

    • Contact