Chemical Evolution of the Galactic Bulge as Derived from High-Resolution Infrared Spectroscopy of K and M Red Giants

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dc.creatorCunha, Katia
dc.creatorSmith, Verne V.
dc.date2006-07-17
dc.date.accessioned2026-07-07T10:39:36Z
dc.date.available2026-07-07T10:39:36Z
dc.descriptionWe present chemical abundances in K and M red-giant members of the Galactic bulge derived from high-resolution infrared spectra obtained with the Phoenix spectrograph on Gemini-South. The elements studied are carbon, nitrogen, oxygen, sodium, titanium, and iron. The evolution of C and N abundances in the studied red-giants show that their oxygen abundances represent the original values with which the stars were born. Oxygen is a superior element for probing the timescale of bulge chemical enrichment via [O/Fe] versus [Fe/H]. The [O/Fe]-[Fe/H] relation in the bulge does not follow the disk relation, with [O/Fe] values falling above those of the disk. Titanium also behaves similarly to oxygen with respect to iron. Based on these elevated values of [O/Fe] and [Ti/Fe] extending to large Fe abundances, it is suggested that the bulge underwent a more rapid chemical enrichment than the halo. In addition, there are declines in both [O/Fe] and [Ti/Fe] in those bulge targets with the largest Fe abundances, signifying another source affecting chemical evolution: perhaps Supernovae of Type Ia. Sodium abundances increase dramatically in the bulge with increasing metallicity, possibly reflecting the metallicity dependant yields from supernovae of Type II, although Na contamination from H-burning in intermediate mass stars cannot be ruled out.
dc.descriptionApJ in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0607393
dc.identifierhttp://arxiv.org/abs/astro-ph/0607393
dc.identifierAstrophys.J.651:491-501,2006
dc.identifierdoi:10.1086/507673
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181087
dc.subjectAstrophysics
dc.titleChemical Evolution of the Galactic Bulge as Derived from High-Resolution Infrared Spectroscopy of K and M Red Giants
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