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Chemical Abundances of OB Stars with High Projected Rotational Velocities
Simone Daflon, Katia Cunha, Keith Butler +1
Elemental abundances of carbon, nitrogen, oxygen, magnesium, aluminum, and silicon are presented for a sample of twelve rapidly rotating OB star (v sin i > 60 km s^-1) members of t…
The Stellar Parameters and Evolutionary State of the Primary in the d'-Symbiotic System StH\alpha190
Verne V. Smith, Claudio B. Pereira, Katia Cunha
We report on a high-resolution, spectroscopic stellar parameter and abundance analysis of a d' symbiotic star: the yellow component of StH\alpha190. This star has recently been dis…
Nucleosynthesis and mixing on the Asymptotic Giant Branch. III. Predicted and observed s-process abundances
M. Busso, R. Gallino, D. L. Lambert +2
We present the results of s-process nucleosynthesis calculations for AGB stars of different metallicities and initial masses. The computations were based on previously published st…
The Observed Trend of Boron and Oxygen in Field Stars of the Disk
Verne V. Smith, Katia Cunha, Jeremy R. King
Oxygen abundances are derived in a sample of 13 field F and G dwarfs and subgiants with metallicities in the range of -0.75 < [Fe/H] < +0.15. This is the same sample of stars for w…
The Abundance Distribution in the Extrasolar-Planet Host Star HD19994
Verne V. Smith, Katia Cunha, Daniela Lazzaro
Abundances of 22 elements have been determined from a high-resolution, high signal-to-noise spectrum of HD19994, a star recently announced as harboring an extrasolar planet. A deta…