The Ital-FLAMES survey of the Sagittarius dwarf spheroidal galaxy - I. Chemical abundances of bright RGB stars

被引：0

作者：

Monaco, L

Bellazzini, M

Bonifacio, P

Ferraro, FR

Marconi, G

Pancino, E

Sbordone, L

Zaggia, S

机构：

[1] Ist Nazl Astrofis, Osservatorio Astron Trieste, I-34131 Trieste, Italy

[2] Ist Nazl Astrofis, Osservatorio Astron Bologna, I-40127 Bologna, Italy

[3] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy

[4] European So Observ, Santiago 19, Chile

[5] Ist Nazl Astrofis, Osservatorio Astron Roma, I-00040 Rome, Italy

[6] Univ Roma Tor Vergata, Rome, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2005年 / 441卷 / 01期

关键词：

stars : atmospheres; Galaxy : abundances; galaxies : evolution; galaxies : dwarf; galaxies : individual : Sgr dSph;

D O I：

10.1051/0004-6361:20053333

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present iron and a element (Mg, Ca, Ti) abundances for a sample of 15 Red Giant Branch stars belonging to the main body of the Sagittarius dwarf Spheroidal galaxy. Abundances have been obtained from spectra collected using the high resolution spectrograph FLAMES-UVES mounted at the VLT. Stars of our sample have a mean metallicity of [Fe/H] = - 0.41 +/- 0.20 with a metal-poor tail extending to [Fe/H] = - 1.52. The alpha element abundance ratios are slightly subsolar for metallicities higher than [Fe/H] greater than or similar to - 1, suggesting a slow star formation rate. The [alpha/Fe] of stars having [Fe/H] < - 1 are compatible to what observed in Milky Way stars of comparable metallicity.

引用

页码：141 / U37

页数：18

共 26 条

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