Abundances of 9 HB stars in NGC 6352 (Feltzing+, 2009)

Details Abundances of 9 HB stars in NGC 6352 (Feltzing+, 2009) Abundances of 9 HB stars in NGC 6352 (Feltzing+, 2009)

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ycat..34930913f&link_type=abstract

VizieR On-line Data Catalog: J/A+A/493/913. Originally published in: 2009A&A...493..913F

Computer Science

Clusters: Globular, Stars: Horizontal Branch, Abundances

Scientific paper

Metal-rich globular clusters provide important tracers of the formation of our Galaxy. Moreover, and not less important, they are very important calibrators for the derivation of properties of extra-galactic metal-rich stellar populations. Nonetheless, only a few of the metal-rich globular clusters in the Milky Way have been studied using high-resolution stellar spectra to derive elemental abundances. Additionally, Rosenberg et al. identified a small group of metal-rich globular clusters that appeared to be about 2 billion years younger than the bulk of the Milky Way globular clusters. However, it is unclear if like is compared with like in this dataset as we do not know the enhancement of alpha-elements in the clusters and the amount of alpha-elements is well known to influence the derivation of ages for globular clusters. We present a study of elemental abundances for alpha and iron-peak elements for nine HB stars in the metal-rich globular cluster NGC 6352. The elemental abundances are based on high-resolution, high signal-to-noise spectra obtained with the UVES spectrograph on VLT. The elemental abundances have been derived using standard LTE calculations and stellar parameters have been derived from the spectra themselves by requiring ionizational as well as excitational equilibrium. We find that NGC 6352 has [Fe/H]=-0.55, is enhanced in the alpha-elements to about +0.2dex for Ca, Si, and Ti relative to Fe. For the iron-peak elements we find solar values. Based on the spectroscopically derived stellar parameters we find that an E(B-V)=0.24 and (m-M).
(3 data files).

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