The chemical abundance analysis of normal early A- and late B-type stars
arXiv:0906.5269 · doi:10.1051/0004-6361/200811561
Abstract
Modern spectroscopy of early-type stars often aims at studying complex physical phenomena. Comparatively less attention is paid to identifying and studying the "normal" A- and B-type stars and testing how the basic atomic parameters and standard spectral analysis allow one to fit the observations. We wish to stablish whether the chemical composition of the solar photosphere can be regarded as a reference for early A- and late B-type stars. We have obtained optical high-resolution, high signal-to-noise ratio spectra of three slowly rotating early-type stars (HD 145788, 21 Peg and pi Cet) that show no obvious sign of chemical peculiarity, and performed a very accurate LTE abundance analysis of up to 38 ions of 26 elements (for 21 Peg), using a vast amount of spectral lines visible in the spectral region covered by our spectra. We provide an exhaustive description of the abundance characteristics of the three analysed stars with a critical review of the line parameters used to derive the abundances. We compiled a table of atomic data for more than 1100 measured lines that may be used in the future as a reference. The abundances we obtained for He, C, Al, S, V, Cr, Mn, Fe, Ni, Sr, Y, and Zr are compatible with the solar ones derived with recent 3D radiative-hydrodynamical simulations of the solar photosphere. The abundances of the remaining studied elements show some degree of discrepancy compared to the solar photosphere. Those of N, Na, Mg, Si, Ca, Ti, and Nd may well be ascribed to non-LTE effects; for P, Cl, Sc and Co, non-LTE effects are totally unknown; O, Ne, Ar, and Ba show discrepancies that cannot be ascribed to non-LTE effects. The discrepancies obtained for O (in two stars) and Ne agree with very recent non-LTE abundance analysis of early B-type stars in the solar neighbourhood.
Accepted for publication on Astronomy and Astrophysics
References in corpus (15)
- A cosmic abundance standard: chemical homogeneity of the solar neighbourhood and the ISM dust-phase composition
- Improved Laboratory Transition Probabilities for Neutral Chromium and Re-determination of the Chromium Abundance for the Sun and Three Stars
- Neon Abundances in B-Stars of the Orion Association: Solving the Solar Model Problem?
- Chemically peculiar stars and their temperature calibration
- The effect of rotation on the abundances of the chemical elements of the A-type stars in the Praesepe cluster
- Late stages of the evolution of A-type stars on the main sequence: comparison between observed chemical abundances and diffusion models for 8 Am stars of the Praesepe cluster
- Rare-earth elements in the atmosphere of the magnetic chemically peculiar star HD 144897. New classification of the Nd III spectrum
- Carbon abundances of early B-type stars in the solar vicinity. Non-LTE line-formation for C II/III/IV and self-consistent atmospheric parameters
- Chemical stratification in the atmosphere of Ap star HD 133792. Regularized solution of the vertical inversion problem
- The neon content of nearby B-type stars and its implications for the solar model problem
- Quantitative spectroscopy of Deneb
- Argon Abundances in the Solar Neighborhood: Non-LTE Analysis of Orion Association B-type Stars
- The effect of rotation on the spectrum of Vega
- Spectrum synthesis for magnetic, chemically stratified stellar atmospheres
- Abundances of lithium, sodium, and potassium in Vega
Cited by in corpus (47)
- A high-resolution spectropolarimetric survey of Herbig Ae/Be stars - I. Observations and measurements
- Chemical abundances of magnetic and non-magnetic Herbig Ae/Be stars
- A detailed spectropolarimetric analysis of the planet hosting star WASP-12
- Spiral Arms in Disks: Planets or Gravitational Instability?
- Astrophysical tests of atomic data important for stellar Mg abundance determinations
- The GAPS Programme with HARPS-N at TNG XIX. Atmospheric Rossiter-McLaughlin effect and improved parameters of KELT-9b
- A NLTE line formation for neutral and singly-ionised titanium in model atmospheres of the reference A-K stars
- NLTE line formation for Mg\ione\ and Mg\ii\ in atmospheres of B-A-F-G-K stars
- An In-Depth Spectroscopic Analysis of the Blazhko Star RR Lyr. I. Characterisation of the star: abundance analysis and fundamental parameters
- Confronting uncertainties in stellar physics II. exploring differences in main-sequence stellar evolution tracks
- Are there tangled magnetic fields on HgMn stars?
- The accuracy of stellar atmospheric parameter determinations: a case study with HD 32115 and HD 37594
- Non-LTE line formation for Si I-II-III in A-B stars and the origin of Si II emission lines in iota Her
- Normal A0--A1 stars with low rotational velocities. I. Abundance determination and classification
- NLTE carbon abundance determination in selected A- and B-type stars and the interpretation of C\ione\ emission lines
- Solar System Abundances and Condensation Temperatures of the Halogens Fluorine, Chlorine, Bromine, and Iodine
- Two spotted and magnetic early B-type stars in the young open cluster NGC2264 discovered by MOST and ESPaDOnS
- A NLTE line formation for neutral and singly-ionised calcium in model atmospheres of B-F stars
- Chemical diversity among A-B stars with low rotational velocities: non-LTE abundance analysis
- A solar-type star polluted by calcium-rich supernova ejecta inside the supernova remnant RCW 86
- The first planet detected in the WTS: an inflated hot-Jupiter in a 3.35 day orbit around a late F-star
- A detailed spectroscopic analysis of the open cluster NGC 5460
- Magnetic Doppler imaging of the chemically peculiar star HD 125248
- Improved fundamental parameters and LTE abundances of the CoRoT solar-type pulsator HD49933
- gamma Doradus pulsation in two pre-main sequence stars discovered by CoRoT
- Lithium, Sodium, and Potassium Abundances in Sharp-Lined A-Type Stars
- Chemical composition of intermediate mass stars members of the M6 (NGC 6405) open cluster
- Metallicity dependence of turbulent pressure and macroturbulence in stellar envelopes
- High-resolution Spectroscopy and Spectropolarimetry of Selected Delta Scuti Pulsating Variables
- Photospheric carbon, nitrogen, and oxygen abundances of A-type main-sequence stars
- Rotation and spots in normal A and Am/Fm stars
- Regular frequency patterns in the young delta Scuti star HD 261711 observed by the CoRoT and MOST satellites
- The GAPS programme at TNG: TBD. Studies of atmospheric FeII winds in ultra-hot Jupiters KELT-9b and KELT-20b using HARPS-N spectrograph
- Neon Abundances of B-stars in the Solar Neighborhood
- Looking for a connection between the Am phenomenon and hybrid delta Sct - gamma Dor pulsation: a determination of the fundamental parameters and abundances of HD 114839 and BD +18 4914
- mu Eridani from MOST and from the ground: an orbit, the SPB component's fundamental parameters, and the SPB frequencies
- A spectroscopic study of the open cluster NGC 6250
- A probable pre-main sequence chemically peculiar star in the open cluster Stock 16
- A hot Jupiter transiting a mid-K dwarf found in the pre-OmegaCam Transit Survey
- On the Sodium versus Iron Correlation in Late B-Type Stars
- V772 Cas: an ellipsoidal HgMn star in an eclipsing binary
- The present-day cosmic phosphorus abundance
- BD+30549: young helium-weak silicon star in NGC 1333 star-forming region
- Are Am stars and hot-Jupiter planets related?
- NLTE atmospheric modelling of the ultra-hot Jupiter WASP-178b and comparison with UV and optical observations
- A Spectroscopic Study of Weak Metallic Emission Lines in a B3V Star iota Her
- A Spectroscopic Study of DD UMa: Ursa Major Group Member and Candidate for BRITE