Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasj...49..367t&link_type=abstract
Publications of the Astronomical Society of Japan, v.49, p.367-382.
Astronomy and Astrophysics
Astronomy
22
Clusters: Open (Hyades), Line Profiles, Stars: Abundances, Stars: Metallic-Line, Stars: Rotation
Scientific paper
An extensive profile-fitting analysis of the OI 7771--5 triplet (along with the nearby FeI line) was carried out for thirty-one A-type stars, eighteen of them belonging to the Hyades group, in order to clarify the key factor which plays the decisive role in the appearance of abundance anomalies of metallic-line stars (Am), by examining whether any meaningful relation exists between the microturbulence (xi ), the oxygen abundance (log epsilon_O ), the iron abundance (log epsilon_Fe ), the projected rotational velocity (v_esin i), and the stellar atmospheric parameters. It was clearly found based on the Hyades results that the abundance of O/Fe, both being good indicators of the Am phenomenon, because of the negative/positive correlation with the metallicity estimated from colors, progressively increases/decreases (i.e., toward the direction of disappearance of anomaly) with an increase in v_esin i as well as with a decrease in log g. It was thus concluded that the most important driver of the Am phenomenon, producing a significant deficiency/excess of O/Fe, is the rotational velocity which appears to be responsible for not only the triggering, but also the extent of the peculiarity. Meanwhile, the observed log g-dependence of the abundance e anomalies is considered to be nothing but superficial, which may be interpreted as being due to the correlation between log g and v_esin i, i.e., rotation-induced lowering of the effective gravity.
Sadakane Kozo
Takeda Yoichi
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