dc.contributor.author |
Lai, D. K |
|
dc.contributor.author |
Lee, Y. S |
|
dc.contributor.author |
Bolte, M |
|
dc.contributor.author |
Lucatello, S |
|
dc.contributor.author |
Beers, T. C |
|
dc.contributor.author |
Johnson, J. A |
|
dc.contributor.author |
Sivarani, T |
|
dc.contributor.author |
Rockosi, C. M |
|
dc.date.accessioned |
2011-09-07T11:51:56Z |
|
dc.date.available |
2011-09-07T11:51:56Z |
|
dc.date.issued |
2011-09-01 |
|
dc.identifier.citation |
The Astrophysical Journal, Vol. 738, No. 1, 51 |
en |
dc.identifier.uri |
http://hdl.handle.net/2248/5552 |
|
dc.description |
Open Access |
en |
dc.description.abstract |
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, lang[Fe/H]rang = –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. |
en |
dc.language.iso |
en |
en |
dc.publisher |
IOP Publishing |
en |
dc.relation.uri |
http://iopscience.iop.org/0004-637X/738/1/51/ |
en |
dc.rights |
© IOP Publishing |
en |
dc.subject |
Galaxies: abundances |
en |
dc.subject |
Galaxies: dwarf |
en |
dc.subject |
Galaxies: individual (Bootes I) |
en |
dc.subject |
Stars: abundances |
en |
dc.title |
The [Fe/H], [C/Fe], and [α/Fe] Distributions of the Boötes I Dwarf Spheroidal Galaxy |
en |
dc.type |
Article |
en |