Project VeSElkA: Analysis of Balmer line profiles in slowly rotating chemically peculiar stars

Abstract

We present results for the estimation of gravity, effective temperature, and radial velocity of poorly studied chemically peculiar stars recently observed with the spectropolarimeter Echelle SpectroPolarimetric Device for Observations of Stars at the Canada-France-Hawaii Telescope in the frame of the Vertical Stratification of Element Abundances project. The effective temperature and surface gravity values are determined for the very first time for four of the stars from our sample (HD23878, HD83373, HD95608, and HD164584). Grids of stellar atmosphere models with the corresponding fluxes have been calculated using version 15 of the PHOENIX code for effective temperatures in the range of 5000-15,000 K, for the logarithm of surface gravities in the range of 3.0-4.5 and for the metallicities from -1.0 to +1.5. We used these fluxes to fit the Balmer line profiles employing the code FITSB2 that produces estimates of the effective temperature, gravity, and radial velocity for each star. When possible, our results are compared to those previously published. The physical characteristics of 16 program stars are discussed with the future aim to study the abundance anomalies of chemical species and the possible vertical abundance stratification in their stellar atmosphere.

14 pages, 4 figures, 2 tables, accepted for publication in The Astronomical Journal

References in corpus (8)

• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• Weak magnetic fields in Ap/Bp stars: Evidence for a dipole field lower limit and a tentative interpretation of the magnetic dichotomy
• Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters
• Isotopic anomaly and stratification of Ca in magnetic Ap stars
• Abundances determined using Si II and Si III in B-type stars: evidence for stratification
• Search for vertical stratification of metals in atmospheres of blue horizontal-branch stars
• Vertical abundance stratification in the blue horizontal branch star HD135485
• Recovery of the global magnetic field configuration of 78 Virginis from Stokes IQUV line profiles

Cited by in corpus (8)

• Relativistic redshift of the star S0-2 orbiting the Galactic center supermassive black hole
• MOBSTER -- VI. The crucial influence of rotation on the radio magnetospheres of hot stars
• The anomalous atmospheric structure of the strongly magnetic Ap star HD166473
• Project VeSElkA: results of abundance analysis for HD53929 and HD63975
• Project VeSElkA: Abundance analysis of chemical species in HD41076 and HD148330
• Analysis of eight magnetic chemically peculiar stars with rotational modulation
• Rotational and pulsational variability in the TESS light curve of HD27463
• Project VeSElkA: Search for vertical stratification of element abundances in HD157087