2011ApJ...738...51L

Query : 2011ApJ...738...51L

2011ApJ...738...51L - Astrophys. J., 738, 51 (2011/September-1)

The [Fe/H], [C/Fe], and [α/Fe] distributions of the Bootes I dwarf spheroidal galaxy.

LAI D.K., LEE Y.S., BOLTE M., LUCATELLO S., BEERS T.C., JOHNSON J.A., SIVARANI T. and ROCKOSI C.M.

Abstract (from CDS):

We present the results of a low-resolution spectral abundance study of 25 stars in the Boötes I dwarf spheroidal (dSph) galaxy. The data were obtained with the low resolution imaging spectrometer instrument at Keck Observatory and allow us to measure [Fe/H], [C/Fe], and [α/Fe] for each star. We find both a large spread in metallicity (2.1 dex in [Fe/H]) as well as a low average metallicity in this system, <[Fe/H]> = -2.59, matching previous estimates. This sample includes a newly discovered extremely metal-poor star, with [Fe/H] = -3.8, that is one of the most metal-poor stars yet found in a dSph. We compare the metallicity distribution function of Boötes I to analytic chemical evolution models. While the metallicity distribution function of Boötes I is best fit by an Extra Gas chemical evolution model, leaky-box models also provide reasonable fits. We also find that the [α/Fe] distribution and the carbon-enhanced metal-poor fraction of our sample (12%) are reasonable matches to Galactic halo star samples in the same metallicity range, indicating that at these low metallicities, systems like the Boötes I ultra-faint dSph could have been contributors to the Galactic halo.

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Journal keyword(s): galaxies: abundances - galaxies: dwarf - galaxies: individual: Bootes I - stars: abundances

Simbad objects: 50

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Number of rows : 50
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1359 4
2 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 465 1
3 SDSS J135944.27+143241.2 * 13 59 44.2673311032 +14 32 41.279825400           ~ 3 0
4 SDSS J135944.95+143230.1 * 13 59 44.9496075096 +14 32 30.151665744           ~ 4 0
5 SDSS J135947.06+142852.5 * 13 59 47.067 +14 28 52.56           ~ 4 0
6 SDSS J135948.34+143203.5 * 13 59 48.3349369896 +14 32 03.618231180           ~ 5 0
7 2MASS J13595066+1429120 * 13 59 50.6308758504 +14 29 11.144310324           ~ 4 0
8 SDSS J135950.75+143114.2 * 13 59 50.753 +14 31 14.21           ~ 4 0
9 SDSS J135951.08+143049.8 * 13 59 51.076 +14 30 49.82           ~ 4 0
10 SDSS J135952.33+143245.6 * 13 59 52.3286239680 +14 32 45.681344376           ~ 4 0
11 SDSS J135957.85+142802.5 * 13 59 57.8477533968 +14 28 02.556579900           ~ 6 0
12 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 437 0
13 SDSS J140002.29+142653.4 * 14 00 02.288 +14 26 53.42           ~ 4 0
14 [HWB2008] 34 * 14 00 03.0708825720 +14 30 23.641561692           ~ 6 0
15 SDSS J140003.32+142851.4 * 14 00 03.3286109544 +14 28 51.496221468           ~ 6 0
16 SDSS J140005.33+143023.3 * 14 00 05.3327571744 +14 30 23.392504800           ~ 6 0
17 SDSS J140005.61+142618.8 * 14 00 05.6112063432 +14 26 18.871409652           ~ 3 0
18 2MASS J14000985+1428228 * 14 00 09.8519784912 +14 28 22.997618256           ~ 13 0
19 AP J14001049+1431454 RB? 14 00 10.4860038864 +14 31 45.523177176           ~ 17 0
20 SDSS J140011.53+142556.0 * 14 00 11.5323033696 +14 25 56.081630244           ~ 4 0
21 SDSS J140012.92+143311.7 RB? 14 00 12.9168376512 +14 33 11.785262436           ~ 6 0
22 SDSS J140021.84+142553.3 * 14 00 21.8405803944 +14 25 53.397005304           ~ 4 0
23 SDSS J140022.44+143326.9 * 14 00 22.4421383688 +14 33 26.944408764           ~ 5 0
24 SDSS J140023.33+142608.0 * 14 00 23.337 +14 26 07.99           ~ 4 0
25 SDSS J140023.38+143245.2 * 14 00 23.380 +14 32 45.25           ~ 4 0
26 2MASS J14002582+1426073 RB? 14 00 25.8319555968 +14 26 07.618237800           ~ 13 0
27 SDSS J140027.28+143219.5 * 14 00 27.2857964448 +14 32 19.576785912           ~ 4 0
28 SDSS J140033.07+142959.7 * 14 00 33.0728313624 +14 29 59.702771436           ~ 5 0
29 NGC 5904 293 RG* 15 18 20.7268892784 +02 06 41.472317880   14.8800 13.8662   12.7346 ~ 33 0
30 NGC 5904 501 RG* 15 18 30.4935229440 +02 07 00.547230432   14.4800 13.2900   12.0993 ~ 24 0
31 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1978 0
32 NGC 5904 612 RG* 15 18 34.0127761416 +02 07 15.869136540   14.8600 13.7900   12.6586 ~ 26 0
33 NGC 5904 653 RG* 15 18 35.3133819792 +02 07 40.104335604   14.5100 13.3600   12.1848 ~ 34 0
34 NGC 5904 731 RG* 15 18 37.8171133944 +02 07 02.488561032   14.8500 13.8200   12.6774 ~ 25 0
35 NGC 5904 774 RG* 15 18 39.5468841048 +02 07 23.833088472   14.3900 13.2200   12.0244 ~ 23 0
36 2MASS J15184052+0207337 RG* 15 18 40.5233923296 +02 07 33.780842256   14.4700 13.3300   12.1487 ~ 20 0
37 2MASS J15184298+0207314 RG* 15 18 42.9880459704 +02 07 31.470224916   13.9500 12.4400   10.9986 ~ 27 0
38 NGC 5904 872 RG* 15 18 45.5149016664 +02 07 20.244223884   14.355 13.104 12.923 11.8441 ~ 24 0
39 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 578 3
40 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2116 0
41 NGC 7078 64 RG* 21 29 42.959 +12 09 53.41   16.11 15.25     ~ 29 0
42 NGC 7078 144 RG* 21 29 49.7866647864 +12 11 05.792758584   14.40 13.06     ~ 64 0
43 NGC 7078 169 RG* 21 29 50.8243628688 +12 11 30.124425696   14.21 13.21   12.03 ~ 32 0
44 NGC 7078 255 RG* 21 29 53.1138013056 +12 12 31.075871364   14.816 13.766 13.415   ~ 37 0
45 NGC 7078 341 RG* 21 29 54.9258244080 +12 13 22.484816292   13.72 12.54   11.22 ~ 55 0
46 NGC 7078 431 RG* 21 29 56.1807152208 +12 12 33.705816948   13.83 12.73   11.51 ~ 43 0
47 NGC 7078 553 RG* 21 29 58.0128111312 +12 14 26.049470604   15.76 14.87     ~ 35 0
48 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3140 0
49 NGC 7078 875 RG* 21 30 03.1684811400 +12 13 28.694109072   14.61 13.78   12.74 ~ 32 0
50 NAME Local Group GrG ~ ~           ~ 8391 0

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