DETAILED CHEMICAL ABUNDANCES OF GLOBULAR CLUSTERS IN LOCAL GROUP DWARF GALAXIES

被引:15
作者
Colucci, J. E. [1 ]
Bernstein, R. A. [1 ]
McWilliam, A. [2 ]
机构
[1] Univ Calif Santa Cruz, UCO Lick Observ, Dept Astron & Astrophys, 1156 High St, Santa Cruz, CA 95064 USA
[2] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA
来源
CRAL-2010: A UNIVERSE OF DWARF GALAXIES | 2011年 / 48卷
关键词
LARGE-MAGELLANIC-CLOUD; HIGH-RESOLUTION; SPECTROSCOPY; NGC-147;
D O I
10.1051/eas/1148064
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present detailed chemical abundances of Fe, Ca and Ba for 17 globular clusters (GCs) in 5 Local Group dwarf galaxies: NGC 205, NGC 6822, WLM, the SMC and LMC. These abundances are part of a larger sample of over 20 individual elements measured in GCs in these galaxies using a new analysis method for high resolution, integrated light spectra. Our analysis also provides age and stellar population constraints. The existence of GCs in dwarf galaxies with a range of ages implies that there were episodes of rapid star formation (SF) throughout the history of these galaxies; the abundance ratios of these clusters suggest that the duration of these burst varied considerably from galaxy to galaxy. We find evolution of Fe, Ca, and Ba with age in the LMC, SMC, and NGC 6822 that is consistent with extended, lower-efficiency SF between bursts, with an increasing contribution of low-metallicity AGB ejecta at late times. Our sample of GCs in NGC 205 and WLM are predominantly old and metal-poor with high [Ca/Fe] ratios, implying that the early history of these galaxies was marked by consistently high SF rates.
引用
收藏
页码:275 / +
页数:2
相关论文
共 11 条
  • [1] Bernstein R.A., 2010, APJ UNPUB
  • [2] Colucci J.E., 2010, APJ UNPUB
  • [3] M31 GLOBULAR CLUSTER ABUNDANCES FROM HIGH-RESOLUTION, INTEGRATED-LIGHT SPECTROSCOPY
    Colucci, Janet E.
    Bernstein, Rebecca A.
    Cameron, Scott
    McWilliam, Andrew
    Cohen, Judith G.
    [J]. ASTROPHYSICAL JOURNAL, 2009, 704 (01) : 385 - 414
  • [4] THE GLOBULAR-CLUSTERS OF THE DWARF ELLIPTICAL GALAXIES NGC-147, NGC-185, AND NGC-205. I. ABUNDANCES
    DACOSTA, GS
    MOULD, JR
    [J]. ASTROPHYSICAL JOURNAL, 1988, 334 (01) : 159 - 174
  • [5] Globular cluster abundances from high-resolution integrated-light spectra. I. 47 Tuc
    McWilliam, Andrew
    Bernstein, Rebecca A.
    [J]. ASTROPHYSICAL JOURNAL, 2008, 684 (01) : 326 - 347
  • [6] The chemical composition of red giant stars in four intermediate-age clusters of the large magellanic cloud
    Mucciarelli, Alessio
    Carretta, Eugenio
    Origlia, Livia
    Ferraro, Francesco R.
    [J]. ASTRONOMICAL JOURNAL, 2008, 136 (01) : 375 - 388
  • [7] CHEMICAL COMPOSITION OF THE OLD GLOBULAR CLUSTERS NGC 1786, NGC 2210, AND NGC 2257 IN THE LARGE MAGELLANIC CLOUD
    Mucciarelli, Alessio
    Origlia, Livia
    Ferraro, Francesco R.
    [J]. ASTROPHYSICAL JOURNAL, 2010, 717 (01) : 277 - 288
  • [8] Chemical abundances in LMC stellar populations - I. The inner disk sample
    Pompeia, L.
    Hill, V.
    Spite, M.
    Cole, A.
    Primas, F.
    Romaniello, M.
    Pasquini, L.
    Cioni, M. -R.
    Hane, T. Smecker
    [J]. ASTRONOMY & ASTROPHYSICS, 2008, 480 (02) : 379 - U37
  • [9] Ages, metallicities and [α/Fe] ratios of globular clusters in NGC 147, 185 and 205
    Sharina, M. E.
    Afanasiev, V. L.
    Puzia, T. H.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2006, 372 (03) : 1259 - 1274
  • [10] Stellar chemical signatures and hierarchical galaxy formation
    Venn, KA
    Irwin, M
    Shetrone, MD
    Tout, CA
    Hill, V
    Tolstoy, E
    [J]. ASTRONOMICAL JOURNAL, 2004, 128 (03) : 1177 - 1195