Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasj...50..509t&link_type=abstract
Publications of the Astronomical Society of Japan, v.50, p.509-517.
Astronomy and Astrophysics
Astronomy
16
Clusters: Open (Hyades), Lithium Chasm, Stars: Abundances (O, N), Stars: Atmospheres, Stars: F Dwarfs
Scientific paper
The abundances of oxygen and nitrogen were investigated for eleven Hyades F type main-sequence stars, based on the line-profile of O I (+Fe I) 8446 and the equivalent-widths of N I 8629/8683, in order to examine whether any conspicuous abundance deficiency exists for O and N at T_eff ~ 6700 K similar to that observed for Li, since its possibility was suggested by the diffusion interpretation of this ``Li-chasm''. It turned out, however, that the abundances appear to be nearly independent of T_eff (and v_e sin i ) for both O and N, without showing any apparent dip larger than ~ 0.2 dex (for O) or ~ 0.3 dex (for N), being consistent with the results of García-Lopez et al.'s (1993, AAA 58.114.068) study for oxygen. This may indicate that the diffusion process alone is probably not responsible for the origin of the Li-gap. Regarding the averaged O and N abundances in these Hyades F stars, a moderate N-excess by ~ 0.3 dex relative to the Sun was suggested (though not definite), with oxygen being nearly normal.
Kawanomoto Satoshi
Sadakane Kozo
Takada-Hidai Masahide
Takeda Yoichi
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