Project VeSElkA: Abundance analysis of chemical species in HD41076 and HD148330

Abstract

A new semi-automatic approach is employed to carry out the abundance analysis of high-resolution spectra of HD41076 and HD148330 obtained recently with the spectropolarimetre ESPaDOnS at the CFHT. This approach allows to prepare in a semi-automatic mode the input data for the modified ZEEMAN2 code and to analyse several hundreds of line profiles in sequence during a single run. It also provides more information on abundance distribution for each chemical element at the deeper atmospheric layers. Our analysis of the Balmer profiles observed in the spectra of HD41076 and HD148330 has resulted in the estimates of their effective temperature, gravity, metallicity and radial velocity. The respective models of stellar atmosphere have been calculated with the code PHOENIX and used to carry out abundance analysis employing the modified ZEEMAN2 code. The analysis shows a deficit of the C, N, F, Mg, Ca, Ti, V, Cu, Y, Mo, Sm and Gd, and overabundance of Cr, Mn, Fe, Co, Ni, Sr, Zr, Ba, Ce, Nd and Dy in the stellar atmosphere of HD41076. In the atmosphere of HD148330, the C, N and Mo appear to be underabundant, while the Ne, Na, Al, Si, P, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Sr, Y, Zr, Ba, Ce, Pr, Nd, Sm, Eu, Gd and Dy are overabundant. We also have found signatures of vertical abundance stratification of Fe, Ti, Cr and Mn in HD41076, and of Fe, Ti, V, Cr, Mn, Y, Zr, Ce, Nd, Sm and Gd in HD148330.

15 pages, 7 figures, 8 tables, accepted for publication in MNRAS

References in corpus (11)

• The elemental composition of the Sun II. The iron group elements Sc to Ni
• The elemental composition of the Sun I. The intermediate mass elements Na to Ca
• The elemental composition of the Sun III. The heavy elements Cu to Th
• Searching for links between magnetic fields and stellar evolution III. Measurement of magnetic fields in open cluster Ap stars with ESPaDOnS
• A Map of Dust Reddening to 4.5 kpc from Pan-STARRS1
• Chemically peculiar stars and their temperature calibration
• Isotopic anomaly and stratification of Ca in magnetic Ap stars
• 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
• Spectral analysis and abundances of the post-HB star HD 76431

Cited by in corpus (3)

• The 10.5 year rotation period of the strongly magnetic rapidly oscillating Ap star HD 166473
• Rotational and pulsational variability in the TESS light curve of HD27463
• Analysis of eight magnetic chemically peculiar stars with rotational modulation