A new method for the inversion of atmospheric parameters of A/Am stars

  title={A new method for the inversion of atmospheric parameters of A/Am stars},
  author={Marwan Gebran and W. Farah and F. Paletou and Richard Monier and Victor Watson},
  journal={arXiv: Instrumentation and Methods for Astrophysics},
We present an automated procedure that derives simultaneously the effective temperature $T_{eff}$, the surface gravity logg, the metallicity [Fe/H], and the equatorial projected rotational velocity vsini for "normal" A and Am stars. The procedure is based on the principal component analysis inversion method of Paletou et al. (2015a). A sample of 322 high resolution spectra of F0-B9 stars, retrieved from the Polarbase, SOPHIE, and ELODIE databases, were used to test this technique with real data… Expand

Figures and Tables from this paper

Pushing Automated Abundance Derivations into the Cool Dwarf Regime: A Test Using Three G and Two K Stars in Praesepe
We present the results of an abundance analysis of three G and two K dwarfs in the Praesepe open cluster based on high-resolution, moderate signal-to-noise-ratio spectra obtained with the ARC 3.5-mExpand
HR 8844: a new transition object between the Am stars and the HgMn stars ?
While monitoring a sample of apparently slowly rotating superficially normal early A stars, we have discovered that HR 8844 (A0 V), is actually a new Chemically Peculiar star. We have first comparedExpand
A and F stars as probes of outer Galactic disc kinematics
Previous studies of the rotation law in the outer Galactic disc have mainly used gas tracers or clump giants. Here, we explore A and F stars as alternatives: these provide a much denser sampling inExpand
Photometric detection of internal gravity waves in upper main-sequence stars
Context. Main sequence stars with a convective core are predicted to stochastically excite internal gravity waves (IGWs), which effectively transport angular momentum throughout the stellar interiorExpand
Magnetic fields of chemically peculiar and related stars. III. Main results of 2016 and analysis of closest perspectives
We have analyzed more than 90 papers in the area “Magnetic fields and physical parameters of chemically peculiar and related stars,” published mainly in 2016. The main results of the period underExpand
Rotation and spots in normal A and Am/Fm stars
Frequency analysis of long-term ultra-precise photometry can lead to precise values of rotation frequencies of rotating stars with “hump and spike” features in their periodograms. Using theseExpand
Two eclipsing binaries in the USco association have recently yielded precise values of masses and radii for four low-mass members of the association. Standard evolution models would require theseExpand
A revisit to the enigmatic variable star 21 Comae
The magnetic chemically peculiar (Ap/CP2) star 21 Com has been extensively studied in the past, albeit with widely differing and sometimes contradictory results, in particular concerning theExpand
The Kinematics of the Outer Galactic Disk from A and F Stars
The kinematics of stars in the outer Galactic disk is poorly known. In addition to constraining the Galactic potential, knowledge of the motions of stars throughout the disk facilitates studies ofExpand
The co-existence of hot and cold gas in debris discs
Context. Debris discs have often been described as gas-poor discs as the gas-to-dust ratio is expected to be considerably lower than in primordial, protoplanetary discs. However, recent observationsExpand


Estimation of stellar atmospheric parameters from SDSS/SEGUE spectra
We present techniques for the estimation of stellar atmospheric parameters ( T eff , $\log~g$, [Fe/H]) for stars from the SDSS/SEGUE survey. The atmospheric parameters are derived from the observedExpand
Stellar parametrization from Gaia RVS spectra
Among the myriad of data collected by the ESA Gaia satellite, about 150 million spectra will be delivered by the Radial Velocity Spectrometer (RVS) for stars as faint as G_RVS~16. A specific stellarExpand
Chemical composition of A and F dwarf members of the Coma Berenices open cluster
Aims. Abundances of 18 chemical elements have been derived for 11 A (normal and Am) and 11 F dwarfs members of the Coma Berenices open cluster in order to set constraints on evolutionary modelsExpand
Stellar characterization of CoRoT/Exoplanet fields with MATISSE
The homogeneous spectroscopic determination of the stellar parameters is a mandatory step for transit detections from space. Knowledge of which population the planet hosting stars belong to placesExpand
New grids of ATLAS9 atmospheres I: Influence of convection treatments on model structure and on observable quantities
Received ; accepted Abstract. We present several new sets of grids of model stellar atmospheres computed with modified versions of the ATLAS9 code. Each individual set consists of several grids ofExpand
The Evolution of AmFm Stars, Abundance Anomalies, and Turbulent Transport
Stellar evolution models of stars of 1.45-3.0 M☉ have been calculated, including the atomic diffusion of metals and radiative accelerations for all species in the OPAL opacities. As the abundancesExpand
Abundances in HD 27411 and the helium problem in Am stars
We analyse a high-resolution spectrum of the A3m star HD 27411. We compare abundances derived from atlas9 model atmospheres with those using the more computationally intensive atlas12 code. We foundExpand
Chemical composition of A and F dwarfs members of the Hyades open cluster
Aims. Abundances of 15 chemical elements have been derived for 28 F and 16 A stars members of the Hyades open cluster in order to set constraints on self-consistent evolutionary models that includeExpand
Abundances of the elements He to Ni in the atmosphere of Sirius A
Context. The abundances of elements in the atmosphere of an individual star provide a very broad range of extremely important information about the formation and evolution history of that star.Expand
Can Sodium Abundances of A-Type Stars Be Reliably Determined from Na I 5890/5896 Lines?
An extensive non-LTE abundance analysis based on Na I 5890/5896 doublet lines was carried out for a large unbiased sample of ~120 A-type main-sequence stars (including 23 Hyades stars) covering aExpand