Chemical Abundances in 12 Red Giants of the Large Magellanic Cloud from High-Resolution Infrared Spectroscopy | Zendy

Verne V. Smith | Zendy; Kenneth H. Hinkle | Zendy; Kátia Cunha | Zendy; B. Plez | Zendy; David L. Lambert | Zendy; C. A. Pilachowski | Zendy; B. Barbuy | Zendy; J. Meléndez | Zendy; S. Balachandran | Zendy; M. S. Bessell | Zendy; D. Geisler | Zendy; J. E. Hesser | Zendy; Cláudia Winge | Zendy

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Chemical Abundances in 12 Red Giants of the Large Magellanic Cloud from High-Resolution Infrared Spectroscopy

Author(s) -

Verne V. Smith,

Kenneth H. Hinkle,

Kátia Cunha,

B. Plez,

David L. Lambert,

C. A. Pilachowski,

B. Barbuy,

J. Meléndez,

S. Balachandran,

M. S. Bessell,

D. Geisler,

J. E. Hesser,

Cláudia Winge

Publication year - 2002

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/344482

Subject(s) - astrophysics , physics , metallicity , large magellanic cloud , red giant , red giant branch , astronomy , galaxy , stars

High-resolution infrared spectra (R=50,000) have been obtained for twelvered-giant members of the LMC with the Gemini South 8.3-meter telescope plusPhoenix spectrometer. Quantitative chemical abundances of carbon-12, carbon-13,nitrogen-14, and oxygen-16 were derived from molecular lines of CO, CN, and OH,while sodium, scandium, titanium, and iron abundances were derived from neutralatomic lines. The LMC giants have masses from about 1 to 4 solar masses andspan a metallicity range from [Fe/H]= -1.1 to -0.3. The program red giants allshow evidence of first dredge-up mixing, with low 12C/13C ratios, and low 12Ccorrelated with high 14N abundances. Comparisons of the oxygen-to-iron ratiosin the LMC and the Galaxy indicate that the trend of [O/Fe] versus [Fe/H] inthe LMC falls about 0.2 dex below the Galactic trend. Such an offset can bemodeled as due to an overall lower rate of supernovae per unit mass in the LMCrelative to the Galaxy, as well as a slightly lower ratio of supernovae of typeII to supernovae of type Ia.Comment: 25 pages, 6 tables, 10 figures. "In press" in The Astronomical Journal (scheduled for December 2002

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