Temperature, gravity, and bolometric correction scales for non-supergiant OB stars
@article{Nieva2012TemperatureGA, title={Temperature, gravity, and bolometric correction scales for non-supergiant OB stars}, author={M. Fernanda Nieva}, journal={Astronomy and Astrophysics}, year={2012}, volume={550}, pages={1-14} }
Context. Precise and accurate determinations of the atmospheric parameters effective temperature and surface gravity are mandatory to derive reliable chemical abundances in OB stars. Furthermore, fundamental parameters like distances, masses, radii, luminosities can also be derived from the temperature and gravity of the stars. Aims. Atmospheric parameters recently determined at high precision with several independent spectroscopic indicators in non-local thermodynamic equilibrium, with typical…
Figures and Tables from this paper
43 Citations
Temperature and gravity scales in hot stars
- Physics, Chemistry
- 2013
Precise determinations of effective temperatures and surface gravities are mandatory to derive not only reliable chemical abundances, but also parameters like distances, masses, radii and…
Fundamental properties of nearby single early B-type stars
- Physics
- 2014
Fundamental parameters of a sample of 26 apparently slowly-rotating single early B-type stars in the solar neighbourhood are presented and compared to high-precision data from detached eclipsing…
THE AGES OF EARLY-TYPE STARS: STRÖMGREN PHOTOMETRIC METHODS CALIBRATED, VALIDATED, TESTED, AND APPLIED TO HOSTS AND PROSPECTIVE HOSTS OF DIRECTLY IMAGED EXOPLANETS
- Geology, Physics
- 2015
Age determination is undertaken for nearby early type (BAF) stars, which constitute attractive targets for high-contrast debris disk and planet imaging surveys. Our analysis sequence consists of…
Quantitative spectroscopy of OB stars: from dwarfs to supergiants
- Physics, Geology
- 2013
We discuss recent progress made in the spectral modelling of OB stars from the main sequence to evolved phases as BA-type supergiants. Non-LTE line-formation computations can now reproduce observed…
The spectroscopic Hertzsprung-Russell diagram of Galactic massive stars
- Physics
- 2014
The distribution of stars in the Hertzsprung-Russell diagram narrates their evolutionary history and directly assesses their properties. Placing stars in this diagram however requires the knowledge…
Hot stars and cosmic abundances
- Physics
- 2013
Hot massive stars are ideal indicators for present-day cosmic abundances. We review results from a non-LTE study of a larger sample of early B-type stars in the solar neighbourhood by Nieva &…
Hot stars observed by XMM-Newton
- PhysicsAstronomy & Astrophysics
- 2018
We perform a survey of Oe and Be stars in the X-ray range. To this aim, we cross-correlated XMM-Newton and Chandra catalogs of X-ray sources with a list of Be stars, finding 84 matches in total. Of…
B stars seen at high resolution by XMM-Newton
- Physics
- 2017
We report on the properties of 11 early B stars observed with gratings on board XMM-Newton and Chandra, thereby doubling the number of B stars analysed at high resolution. The spectra typically…
Oxygen abundance determination of B-type stars with the O i 7771–5 Å lines
- Physics
- 2016
Oxygen abundances of 34 B-type stars in the effective temperature range of Teff~10000-28000K with diversified rotational velocities (vesini~ 0-250km/s) were determined from the OI triplet lines at…
Critical study of the distribution of rotational velocities of Be stars. I. Deconvolution methods, effects due to gravity darkening, macroturbulence, and binarity
- Physics
- 2016
Context. Among intermediate-mass and massive stars, Be stars are the fastest rotators in the main sequence (MS) and, as such, these stars are a cornerstone to validate models of structure and…
References
SHOWING 1-10 OF 41 REFERENCES
Atmospheric parameter determination for massive stars via non-LTE spectrum analysis
- Physics
- 2010
We describe a self-consistent spectrum analysis technique employing non-LTE line formation, which allows precise atmospheric parameters of massive stars to be derived: 1σ -uncertainties as low as …
A new calibration of stellar parameters of Galactic O stars
- Physics
- 2005
We present new calibrations of stellar parameters of O stars at solar metallicity taking non-LTE, wind, and line-blanketing effects into account. Gravities and absolute visual magnitudes are derived…
Quantitative spectroscopy of Galactic BA-type supergiants I. Atmospheric parameters ,
- Physics
- 2012
Context. BA-type supergiants show a high potential as versatile indicators for modern astronomy. This paper constitutes the first in a series that aims at a systematic spectroscopic study of Galactic…
The Lyman-Continuum Fluxes and Stellar Parameters of O and Early B-Type Stars
- Physics
- 1996
Using the results of the most recent stellar atmosphere models applied to a sample of hot stars, we construct calibrations of effective temperature (T(sub eff)), and gravity (log(sub g)) with a…
The chemical composition of the Orion star forming region - I. Homogeneity of O and Si abundances in B-type stars
- Physics, Geology
- 2010
Context. Recent accurate abundance analyses of B-type main sequence stars in the solar vicinity has shown that abundances derived from these stellar objects are more homogeneous and metal-rich than…
Model atmospheres for G, F, A, B, and O stars
- Physics
- 1979
A grid of LTE model atmospheres is presented for effective temperatures ranging from 5500 to 50,000 K, for gravities from the main sequence down to the radiation pressure limit, for abundances solar,…
Present-day cosmic abundances - A comprehensive study of nearby early B-type stars and implications for stellar and Galactic evolution and interstellar dust models
- Physics
- 2012
Aims. A carefully selected sample of early B-type stars in OB associations and the field within the solar neighbourhood is studi ed comprehensively. Present-day abundances for the astrophysically…
Surface abundances of light elements for a large sample of early B-type stars – II. Basic parameters of 107 stars
- Physics
- 2002
Effective temperatures T e f f , surface gravities log g and interstellar extinctions A v are found for 107 B stars. Distances d of the stars, which are based on the derived T e f f , log g and A v…
Neon Abundances in B Stars of the Orion Association: Solving the Solar Model Problem?
- Physics
- 2006
We report on non-LTE Ne abundances for a sample of B-type stellar members of the Orion association. The abundances were derived by means of non-LTE fully metal-blanketed model atmospheres and…
Carbon abundances of early B-type stars in the solar vicinity. Non-LTE line-formation for C II/III/I
- Physics
- 2008
Context. Precise determinations of the chemical composition in early B-type stars constitute fundamental observational constraints on stellar and galactochemical evolution. Carbon, in particular, is…