Abundance analysis of roAp stars. I. α Circini.

Details Abundance analysis of roAp stars. I. α Circini. Abundance analysis of roAp stars. I. α Circini.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308..886k&link_type=abstract

Astronomy and Astrophysics, v.308, p.886-894

Astronomy and Astrophysics

Astrophysics

42

Stars: Abundances, Stars: Chemically Peculiar, Stars: Magnetic Fields, Stars: {Alpha} Cir, Stars: Fundamental Parameters

Scientific paper

Based on high resolution, low noise spectroscopy in the spectral region from 4200A to 6700A we derived T_eff_=7900+/-200K, logg=4.2+/-0.15, vsin(i)=12.5(-0.5,+1.5)km/s, and elemental abundances for the rapidly oscillating (ro)Ap star αCir(HD128898, HR5463). We used the spectrum synthesis and the equivalent width technique and confirmed the presence of a magnetic field in αCir. The underabundance of C, N, and O, and the overabundances of rare-earth and some other heavy elements are comparable to other cool Ap-stars. The most important peculiarity is that of Co, which is almost as overabundant as Cr, the most overabundant iron peak element in cool Ap-stars.

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