63 citations · 139 across the 10 of their papers we have counts for
10 papers
A chemical signature from fast-rotating low-metallicity massive stars: ROA 276 in omega Centauri
David Yong, John E. Norris, Gary S. Da Costa +5
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 rati…
Optical Spectra of Candidate International Celestial Reference Frame (ICRF) Flat-Spectrum Radio Sources. III
O. Titov, T. Pursimo, H. M. Johnston +4
In extending our spectroscopic program, which targets sources drawn from the International Celestial Reference Frame (ICRF) Catalog, we have obtained spectra for about 160 compact…
Optical Spectra of Flat-Spectrum ICRF Radio Sources
Oleg Titov, Laura M. Stanford, Helen M. Johnston +5
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 ES…
Carbon in the Draco Dwarf Spheroidal Galaxy
Matthew D. Shetrone, Graeme H. Smith, Laura M. Stanford +2
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 spect…
Abundances of C, N, Sr and Ba on the red giant branch of omega Centauri
Laura M. Stanford, Gary S. Da Costa, John E. Norris
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…
Abundances on the Main Sequence of Omega Centauri
Laura M. Stanford, G. S. Da Costa, John E. Norris
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…