HS 2134+0400—a new very metal-poor galaxy, a representative of the void population?
نویسندگان
چکیده
منابع مشابه
Observations of Very Metal-Poor Stars in the Galaxy
I report on recent results from observations of stars with metallicities [Fe/H] ≤ −2.0. These include a substantial new sample of objects with high-resolution observations obtained as part of a follow-up of the HK Survey, The Hamburg/ESO Survey, and the ongoing survey SEGUE: Sloan Extension for Galactic Understanding and Exploration. Perspectives on the next directions are also provided.
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We present new results from optical spectroscopy of the brightest Hii region in the dwarf irregular galaxy UKS1927–177 in Sagittarius (SagDIG). From high signal-to-noise spectra, reddening-corrected line flux ratios have been measured with typical uncertainties of a few percent, from which the oxygen abundance is rediscussed, and new abundance estimates are derived for N and Ne. The O abundance...
متن کاملMetal-Poor Globular Clusters and Galaxy Formation
We demonstrate a significant (> 5σ) correlation between the mean color of metalpoor globular cluster (GC) systems and parent galaxy luminosity. A Bayesian Markov Chain Monte Carlo method is introduced to find the mean color, and is easily generalizable to quantify multimodality in other astronomical datasets. We derive a GC color– galaxy luminosity relation of the form Z ∝ L. When combined with...
متن کاملDetection of WR stars in the metal – poor starburst galaxy
Wolf-Rayet stars (WR) have been detected in the NW region of the metal–poor starburst galaxy IZw 18. The integrated luminosity and FWHM of the bumps at 4650Å and 5808Å are consistent with the presence of a few individual stars of WC4 or WC5 type. Evolutionary synthesis models predict few WRs in this galaxy, but only of WN type. The presence of WC stars at such low metallicity could however be e...
متن کاملSulphur abundance in very metal-poor stars
We have obtained high-resolution high signal-to-noise spectra of the S i nearinfrared doublet at 8694 Å in eight metal-poor stars with metallicities in the range −0.6 ≤[Fe/H]≤ −3.0. Elemental sulphur abundances were derived for six targets and upper limits were set for two of the most metal-poor stars in the sample. The sulphur doublet at 8694.62 Å has been detected in three stars (HD19445, HD2...
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ژورنال
عنوان ژورنال: Astronomy Letters
سال: 2006
ISSN: 1063-7737,1562-6873
DOI: 10.1134/s1063773706040025