CAOSP abstracts, Volume: 27, No.: 3, year: 1998
- Author(s): PISKUNOV, N.; STEMPELS, H.C.; RYABCHIKOVA, T.A.; MALANUSHENKO, V.;
SAVANOV, I.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso,
vol. 27, no. 3, p. 482-484.
- Date: 04/1998
- Title: Multi-element Doppler imaging of kappa Psc
- Keyword(s): STARS: CHEMICALLY PECULIAR, STARS: DOPPLER IMAGING, STARS:
INDIVIDUAL: KAPPA PSC
- Pages: 482 -- 484
Abstract:
kappa Psc (HD 220825) is a typical Chromium Ap star that happens to
have optimal parameters for Doppler imaging (DI). Its short rotational
period of less than 2 days, rotational velocity of approx. 40 km/s, and
a moderate inclination of the rotational axis put modest requirements on
spectroscopic observations. Anomalies of iron peak elements are clearly
present, but small enough to cause significant deviations from model
atmospheres with scaled solar abundances. We applied DI to kappa Psc once
before, determining the distribution of Cr. However, due to strong blending
of Fe, the image was based on two short (approx. 2 A) spectral intervals,
dominated by Cr lines. Since the first paper we obtained additional spectra
and developed a new code that allows to perform multi-element DI and thus to
use larger spectral interval(s). We demonstrate the abilities of the new code
and present new maps of Cr and Fe. A much larger time base allowed us to
improve the rotational period of kappa Psc as well.
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