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of 31
pro vyhledávání: '"Stanford, Laura"'
Autor:
Yong, David, Norris, John E., Da Costa, Gary S., Stanford, Laura M., Karakas, Amanda I., Shingles, Luke J., Hirschi, Raphael, Pignatari, Marco
We present a chemical abundance analysis of a metal-poor star, ROA 276, in the stellar system omega Centauri. We confirm that this star has an unusually high [Sr/Ba] abundance ratio. Additionally, ROA 276 exhibits remarkably high abundance ratios, [X
Externí odkaz:
http://arxiv.org/abs/1702.07087
Autor:
Titov, Oleg, Stanford, Laura M., Johnston, Helen M., Pursimo, Tapio, Hunstead, Richard W., Jauncey, David L., Maslennikov, K., Boldycheva, A.
Continuing our program of spectroscopic observations of ICRF sources, we present redshifts for 120 quasars and radio galaxies. Data were obtained with five telescopes: the 3.58m ESO New Technology Telescope (NTT), the two 8.2m Gemini telescopes, the
Externí odkaz:
http://arxiv.org/abs/1305.3017
Autor:
Shetrone, Matthew D., Smith, Graeme H., Stanford, Laura M., Siegel, Michael H., Bond, Howard E.
Publikováno v:
AJ 2013
Measurements of [C/Fe], [Ca/H], and [Fe/H] have been derived from Keck I LRISb spectra of 35 giants in the Draco dwarf spheroidal galaxy. The iron abundances are derived by a spectrum synthesis modeling of the wavelength region from 4850 to 5375 A, w
Externí odkaz:
http://arxiv.org/abs/1303.3211
Abundances relative to iron for carbon, nitrogen, strontium and barium are presented for 33 stars on the red giant branch of the globular cluster omega Centauri. They are based on intermediate-resolution spectroscopic data covering the blue spectral
Externí odkaz:
http://arxiv.org/abs/1003.4661
Abundance ratios of carbon, nitrogen and strontium relative to iron, calculated using spectrum synthesis techniques, are given for a sample of main sequence and turnoff stars that belong to the globular cluster omega Centauri. The variations of carbo
Externí odkaz:
http://arxiv.org/abs/0708.0096
Publikováno v:
Astrophys.J.653:L117-L120,2006
Abundance ratios relative to iron for carbon, nitrogen, strontium and barium are presented for a metal-rich main sequence star ([Fe/H]=--0.74) in the globular cluster omega Centauri. This star, designated 2015448, shows depleted carbon and solar nitr
Externí odkaz:
http://arxiv.org/abs/astro-ph/0611509
Using the 2dF multi-fibre instrument on the AAT, moderate resolution spectra have been obtained for a large sample of stars on the main sequence and at the turnoff in the unusual globular cluster omega Centauri. We investigate the behaviour of CH, CN
Externí odkaz:
http://arxiv.org/abs/astro-ph/0507162
Although globular clusters are generally chemically homogeneous, substantial abundance variations are sometimes seen even among unevolved main sequence stars, especially for the CNO group of elements. Multi-object intermediate-dispersion spectroscopi
Externí odkaz:
http://arxiv.org/abs/astro-ph/0210324
Akademický článek
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Publikováno v:
Provenance & Annotation of Data & Processes (9783319405926); 2016, p122-133, 12p
