GIANO-TNG spectroscopy of red supergiants in the young star cluster RSGC2
GIANO-TNG spectroscopy of red supergiants in the young star cluster RSGC2
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年轻星团 RSGC2 中红超巨星的 GIANO-TNG 光谱
DOI:
10.1051/0004-6361/201322586
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发表时间:
2013
影响因子:
6.5
通讯作者:
Origlia L
中科院分区:
文献类型:
--
作者:
Origlia L
AimsThe inner disk of the Galaxy has a number of young star clusters dominated by red supergiants that are heavily obscured by dust extinction and observable only at infrared wavelengths. These clusters are important tracers of the recent star formation and chemical enrichment history in the inner Galaxy.MethodsDuring the technical commissioning and as a first science verification of the GIANO spectrograph at the Telescopio NazionaleGalileo, we secured high-resolution (R≃ 50 000) near-infrared spectra of three red supergiants in the young Scutum cluster RSGC2.ResultsTaking advantage of the full YJHK spectral coverage of GIANO in a single exposure, we were able to identify several tens of atomic and molecular lines suitable for chemical abundance determinations. By means of spectral synthesis and line equivalent width measurements, we obtained abundances of Fe and other iron-peak elements such as V, Cr, Ni, of alpha (O, Mg, Si, Ca and Ti) and other light elements (C, N, Na, Al, K, Sc), and of some s-process elements (Y, Sr). We found iron abundances between half and one third solar and solar-scaled [X/Fe] abundance patterns of iron-peak, alpha and most of the light elements, consistent with a thin-disk chemistry. We found a depletion of [C/Fe] and enhancement of [N/Fe], consistent with CN burning, and low12C/13C abundance ratios (between 9 and 11), requiring extra-mixing processes in the stellar interiors during the post-main-sequence evolution. Finally, we found a slight [Sr/Fe] enhancement and a slight [Y/Fe] depletion (by a factor of ≤2), with respect to solar.
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影响因子:
6.5
作者:
I. Negueruela;C. Gonzalez-Fernandez;A. Marco;J. Clark;S. Martínez-Núñez
通讯作者:
I. Negueruela;C. Gonzalez-Fernandez;A. Marco;J. Clark;S. Martínez-Núñez
DOI:
10.1051/0004-6361/201424486
发表时间:
2014
期刊:
arXiv: Astrophysics of Galaxies
影响因子:
--
作者:
N. Ryde;M. Schultheis
通讯作者:
M. Schultheis
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
Katia Cunha;K. Sellgren;V. Smith;Solange V. Ramírez;Robert D. Blum;D. Terndrup
通讯作者:
D. Terndrup
DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
L. Origlia;R. Rich;S. Castro
通讯作者:
S. Castro
DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
S. Andrievsky;J. Lépine;S. Korotin;R. E. Luck;V. Kovtyukh;W. J. Maciel
通讯作者:
W. J. Maciel