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- Title
Spectroscopic abundance analyses of the ³He stars HD 185330 and 3 Cen A.
- Authors
Kozo SADAKANE; Masayoshi NISHIMURA
- Abstract
Abundances of 21 elements in two ³He stars, HD 185330 and 3 Cen A, have been analysed relative to the well-studied sharp-lined B3 V star ι Her. Six elements (P, Ti, Mn, Fe, Ni, and Br) are over-abundant in these two peculiar stars, while six elements (C, O, Mg, Al, S, and Cl) are under-abundant. Absorption lines of the two rarely observed heavy elements Br II and Kr II are detected in both stars and these elements are both over-abundant. The centroid wavelengths of the Ca II infrared triplet lines in these stars are redshifted relative to those lines in ι Her and the presence of heavy isotopes of Ca (mass number 44-46) in these two stars is confirmed. In spite of these similarities, there are several remarkable differences in abundance pattern between these two stars. N is under-abundant in HD 185330, as in many Hg-Mn stars, while it is significantly over-abundant in 3 Cen A. P and Ga are both over-abundant in 3 Cen A, while only P is over-abundant and no trace of absorption line of Ga II can be found in HD 185330. Large over-abundances of Kr and Xe are found in both stars, while the abundance ratio Kr/Xe is significantly different between them (-1.4 dex in HD 185330 and +1.2 dex in 3 Cen A). Some physical explanations are needed to account for these qualitative differences.
- Subjects
STAR formation; ISOTOPES; WAVELENGTHS; PECULIAR stars; CHEMICALLY peculiar stars
- Publication
Publications of the Astronomical Society of Japan, 2018, Vol 70, Issue 3, p40-1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psy031