Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..910p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 3, p. 910-918
Astronomy and Astrophysics
Astrophysics
10
Abundance, Astronomical Maps, Binary Stars, Helium, Peculiar Stars, Silicon, Variability, Line Spectra, Orbital Elements, Spectrum Analysis, Stellar Magnetic Fields, Stellar Rotation
Scientific paper
ET And is a silicon star with a rotation period of 1.62 days and the visible component of a binary system with an orbital period of 48.3 days. We present abundance maps for silicon and helium, based on OHP-AURELIE spectra, and demostrate that silicon and helium are concentrated in a belt-like structure along the magnetic equator. Surface regions with a silicon overabundance are correlated with helium and underabundance. In the framework of diffusion theory, this pattern implies that a magnetic field configuration of ET And which favors the elevation of Si, simultaneously causes He to sink. In addition, we comment on the significance of Doppler mapping of Cp stars for a correct abundance determination and on implications to pulsation mode identifications. We discuss our upper limit for short time-scale radial velocity variations of 1.4 km/s, which contrast to 4 km/s, as was claimed in the literature with a period of 4.8 hours.
Kuschnig Rainer
Piskunov Nicolai
Ryabchikova Tanya A.
Weiss Walter
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