2008ApJ...689L.113N

Query : 2008ApJ...689L.113N

2008ApJ...689L.113N - Astrophys. J., 689, L113-L116 (2008/December-3)

The abundance spread in the Bootes I dwarf spheroidal galaxy.

NORRIS J.E., GILMORE G., WYSE R.F.G., WILKINSON M.I., BELOKUROV V., EVANS N.W. and ZUCKER D.B.

Abstract (from CDS):

We present medium-resolution spectra of 16 radial velocity red-giant members of the low-luminosity Boötes I dwarf spheroidal (dSph) galaxy that have sufficient S/N for abundance determination, based on the strength of the Ca II K line. Assuming [Ca/Fe] ∼ 0.3, the abundance range in the sample is Δ[Fe/H] ∼ 1.7 dex, with one star having [Fe/H] = -3.4. The dispersion is σ([Fe/H]) = 0.45±0.08–similar to those of the Galaxy's more luminous dSph systems and ω Centauri. This suggests that the large mass (≳107 M☉) normally assumed to foster self-enrichment and the production of chemical abundance spreads was provided by the nonbaryonic material in Boötes I.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Abundances - Galaxies: Dwarf - galaxies: individual (Bo"otes I)

Nomenclature: Table 1: [NGW2008] NNNN N=16 among (Nos 7-1137).

Errata: erratum vol. 695, p. 217 (2009)

Simbad objects: 25

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Number of rows : 25
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 HD 2796 Pe* 00 31 16.9147531152 -16 47 40.790991624 9.58 9.28 8.50 8.14 8.67 Fw 203 0
2 CD-38 245 Pe* 00 46 36.1954514592 -37 39 33.555030480   12.733 11.929 13.39 10.996 KIIvw 233 0
3 HE 0305-5442 Pe* 03 06 29.5014981984 -54 30 32.498486568   14.44 13.70 13.212 12.715 KIIvw 79 0
4 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
5 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
6 2MASS J13583380+1421083 RB? 13 58 33.8132852928 +14 21 08.488847052           ~ 30 0
7 [NGW2008] 1069 RB? 13 58 53.2227562800 +14 06 57.852868932           ~ 4 0
8 [NGW2008] 980 RB? 13 59 12.6811477896 +13 42 55.710720072           ~ 11 0
9 2MASS J13593551+1420237 RB? 13 59 35.5221237984 +14 20 23.717473116           ~ 12 0
10 [NGW2008] 8 RB? 13 59 38.6128632696 +14 19 15.897945216           ~ 4 0
11 2MASS J13594880+1419430 RB? 13 59 48.8035332144 +14 19 42.902306436           ~ 12 0
12 [NGW2008] 130 RB? 13 59 48.9735940008 +14 30 06.215943348           ~ 11 0
13 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
14 2MASS J14000107+1436515 RB? 14 00 01.0701105384 +14 36 51.510832956           ~ 13 0
15 2MASS J14001049+1431454 RB? 14 00 10.4860038864 +14 31 45.523177176           ~ 20 0
16 2MASS J14001174+1425013 RB? 14 00 11.7235211064 +14 25 01.409650068           ~ 15 0
17 2MASS J14001456+1435527 RB? 14 00 14.5619559384 +14 35 52.725428304           ~ 19 0
18 [NGW2008] 78 RB? 14 00 14.7319069272 +14 13 13.932639984           ~ 4 0
19 [NGW2008] 34 RB? 14 00 21.1071162504 +14 17 27.953122020           ~ 4 0
20 2MASS J14002582+1426073 RB? 14 00 25.8319555968 +14 26 07.618237800           ~ 16 0
21 2MASS J14003150+1434034 RB? 14 00 31.5041705280 +14 34 03.572360688           ~ 18 0
22 2MASS J14003651+1439272 RB? 14 00 36.5169418536 +14 39 27.331581456           ~ 13 0
23 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
24 BD-18 5550 Pe* 19 58 49.7371417608 -18 12 11.140126164 10.18 10.03 9.35 9.04 8.74 CEMP-no 185 0
25 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0

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