Search for tidally driven abundance anomalies in Am stars

Details Search for tidally driven abundance anomalies in Am stars Search for tidally driven abundance anomalies in Am stars

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..224..749f&link_type=abstract

The A-Star Puzzle, held in Poprad, Slovakia, July 8-13, 2004. Edited by J. Zverko, J. Ziznovsky, S.J. Adelman, and W.W. Weiss,

Physics

3

Techniques: Spectroscopic, Stars: Abundances, Stars: Atmospheres, Binaries: Spectroscopic, Stars: Chemically Peculiar, Stars: Rotation.

Scientific paper

High S/N, high resolution CCD spectra of 10 Am binaries with different orbital elements, rotation and atmospheric parameters obtained with the 2-m telescope of NAO Rozhen (Bulgaria) were analyzed. We carried out preliminary abundance analyses of these stars and studied the possible dependences of abundance anomalies and [Ca/Fe] on their values of effective temperature, v sin i, orbital period, and eccentricity. There are weak trends of [Ca/Fe] increasing with v sin i and decreasing with eccentricity and orbital period. [Ca] seems to be increasing with effective temperature, and [Fe] decreasing with v sin i and increasing with eccentricity. However we need to study more stars to confirm and disentangle the possible trends.

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