Issue |
Astron. Astrophys. Suppl. Ser.
Volume 119, Number 2, October II 1996
|
|
---|---|---|
Page(s) | 321 - 328 | |
DOI | https://doi.org/10.1051/aas:1996248 | |
Published online | 15 October 1996 |
Spectroscopic analysis of 31 Aquilae
Astronomical Observatory, Odessa State University, Odessa 270014, Ukraine
Received:
12
June
1995
Accepted:
21
March
1996
31 Aquilae is the only evolved star for which SMR status was
confirmed by Taylor (1991). For this reason, a new
determination of the atmospheric parameters and chemical
composition of 31 Aql has been made. The observational material
consists of high-dispersion coudé echelle spectra obtained
with a CCD detector and the 1-m telescope of the Special
Observatory of the Russian Academy of Sciences. The new value
of [Fe/H] obtained here is +0.32 dex. This is close to
the upper limit of [Fe/H] for dwarf stars belonging to the thin
disk of the Galaxy. The value of the Li abundance
A(Li)
= 1.35. The value [
] obtained here is
dex.
Within the errors, solar values of [element/Fe] are obtained for
Na, Y, Zr, Ba, La, Ce, Pr, and Nd. The age of 31 Aql and its
location in the Galaxy are estimated, and a careful analysis of
abundance determination errors is carried out. 31 Aql is found
to be in the evolutionary stage in which the convective envelope
begins to extend.
Key words: stars: abundances / stars: evolution / stars: 31 Aql
© European Southern Observatory (ESO), 1996