2005A&A...430L..13S

Query : 2005A&A...430L..13S

2005A&A...430L..13S - Astronomy and Astrophysics, volume 430L13-16 (2005/1-4)

UVES observations of the Canis Major overdensity.

SBORDONE L., BONIFACIO P., MARCONI G., ZAGGIA S. and BUONANNO R.

Abstract (from CDS):

We present the first detailed chemical abundances for three giant stars which are candidate members of the Canis Major overdensity, obtained by using FLAMES-UVES at VLT. The stars, in the background of the open cluster NGC 2477, have radial velocities compatible with a membership to this structure. However, due to Galactic disc contamination, radial velocity by itself is unable to firmly establish membership. The metallicities span the range -0.5≲[Fe/H]≲+0.1. Assuming that at least one of the three stars is indeed a member of CMa implies that this structure has undergone a high level of chemical processing, comparable to that of the Galactic disc. The most metal-rich star of the sample, EIS 6631, displays several abundance ratios which are remarkably different from those of Galactic stars: [α/Fe]~-0.2, [Cu/Fe]~+0.25, [La/Fe]~+0.6, [Ce/Fe]~+0.8 and [Nd/Fe]~+0.6. These ratios make it likely that this star was formed in an external galaxy.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - stars: atmospheres - galaxies: abundances - galaxies: evolution - galaxies: dwarf

Nomenclature: Cl* NGC 2477 EIS NNNNN N=7 among (Nos 2812-31581).

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME MONOGEM SNR SNR 06 58 50 +13 55.9           ~ 124 0
2 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 203 1
3 Cl* NGC 2477 EIS 6631 * 07 51 36.1995987648 -38 31 10.515734616     16.35     ~ 1 0
4 Cl* NGC 2477 EIS 30077 * 07 51 41.0567191056 -38 38 39.103274256     16.51     ~ 1 0
5 NGC 2477 OpC 07 52 11.4 -38 32 47   6.64 5.8     ~ 314 0
6 Cl* NGC 2477 EIS 7873 * 07 52 37.1 -38 28 01     16.26     ~ 1 0
7 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
8 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
9 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
10 HD 175317 PM* 18 55 31.0053872592 -16 22 35.888206980   5.985 5.546     F5V 122 0
11 NAME Local Group GrG ~ ~           ~ 9325 0
12 Cl* NGC 2477 EIS 5429 * ~ ~           ~ 1 0
13 NAME CMa Region reg ~ ~           ~ 52 0
14 Cl* NGC 2477 EIS 31581 * ~ ~           ~ 1 0
15 Cl* NGC 2477 EIS 4383 * ~ ~           ~ 1 0
16 Cl* NGC 2477 EIS 2812 * ~ ~           ~ 1 0

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