SIMBAD references

2003ApJ...592.1173P - Astrophys. J., 592, 1173-1185 (2003/August-1)

Detailed analysis of nearby bulgelike dwarf stars. III. α-Element and heavy-element abundances.


Abstract (from CDS):

The present sample of nearby bulgelike dwarf stars has kinematics and metallicities characteristic of a probable inner disk or bulge origin. Ages derived by using isochrones give 10-11 Gyr for these stars, and metallicities are in the range -0.80≤[Fe/H]≤+0.40. We calculate stellar parameters from spectroscopic data, and chemical abundances of Mg, Si, Ca, Ti, La, Ba, Y, Zr, and Eu are derived by using spectrum synthesis. We found that [α-elements/Fe] show different patterns, depending on the element. Si/Fe, Ca/Fe, and Ti/Fe ratios decline smoothly for increasing metallicities and essentially follow the disk pattern. O and Mg, products of massive supernovae, and also the r-process element Eu are overabundant relative to disk stars, showing a steeper decline for metallicities [Fe/H]>-0.3 dex, and [s-elements/Fe] roughly track the solar values, with no apparent trend with metallicity for [Fe/H]<0, showing subsolar values for the metal rich stars. Both kinematical and chemical properties of the bulgelike stars indicate a distinct identity of this population when compared with disk stars.

Abstract Copyright:

Journal keyword(s): Galaxy: Bulge - Galaxy: Evolution - Stars: Abundances - Stars: Late-Type

CDS comments: table 1 col. (2) : designation bNN not used in SIMBAD

Simbad objects: 37

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