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J/A+A/541/A15 Abundances of M22 subgiants (Marino+, 2012)
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Beginning of ReadMe :J/A+A/541/A15 Abundances of M22 subgiants (Marino+, 2012)
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The double sub-giant branch of NGC 6656 (M22): a chemical characterization.
Marino A.F., Milone A.P., Sneden C., Bergemann M., Kraft R.P.,
Wallerstein G., Cassisi S., Aparicio A., Asplund M., Bedin R.L., Hilker M.,
Lind K., Momany Y., Piotto G., Roederer I.U., Stetson P.B., Zoccali M.
<Astron. Astrophys., 541, A15 (2012)>
=2012A&A...541A..15M
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ADC_Keywords: Clusters, globular ; Stars, giant ; Abundances
Keywords: techniques: spectroscopic - stars: abundances - stars: Population II -
globular clusters: individual: NGC 6656
Abstract:
We present an abundance analysis of 101 subgiant branch (SGB) stars in
the globular cluster M22. Using low-resolution FLAMES/GIRAFFE spectra
we have determined abundances of the neutron-capture strontium and
barium and the light element carbon. With these data we explore
relationships between the observed SGB photometric split in this
cluster and two stellar groups characterized by different contents of
iron, slow neutron-capture process (s-process) elements, and the
alpha element calcium, which we previously discovered in M22's
red-giant stars.
Description:
Ground-based observations were used to analyze the CMD over a wide
spatial field in the B and V bands and to estimate the atmospheric
parameters of the spectroscopic targets. In addition, we used
ground-based U images available for a smaller field, and images taken
with the Advanced Camera for Surveys onboard the HST (ACS/HST) in the
F606W and F814W bands to make our study of the double SGB extend from
the ultraviolet to the infrared spectral regions.
The HST ACS/WFC images were obtained under program GO-10775 (PI
Sarajedini).