GIANO-TNG spectroscopy of red supergiants in the young star cluster RSGC2

GIANO-TNG spectroscopy of red supergiants in the young star cluster RSGC2
复制标题

年轻星团 RSGC2 中红超巨星的 GIANO-TNG 光谱

DOI:
10.1051/0004-6361/201322586
复制
发表时间:
2013
影响因子:
6.5
通讯作者:
Origlia L
Origlia L
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Origlia L

文献摘要

参考文献

被引文献

相似文献

银河系的内盘有许多年轻的星星团,主要由红超巨星组成,这些星团被尘埃消光严重遮蔽,只能在红外波长处观察到。这些星系团是研究银河系内最近星星形成和化学富集历史的重要示踪物。方法在国家伽利略望远镜GIANO摄谱仪的技术调试和首次科学验证期间,我们获得了高分辨率的(50 000卢比)近-年轻盾牌座星系团RSGC 2中三颗红超巨星的红外光谱。结果利用GIANO的完整YJHK光谱覆盖,单次曝光,我们能够识别几十个原子和分子线适合化学丰度测定。通过光谱合成和谱线等效宽度测量,获得了Fe和V、Cr、Ni等铁峰元素的丰度,α(O、Mg、Si、Ca、Ti)和C、N、Na、Al、K、Sc等轻元素的丰度,以及Y、Sr等s过程元素的丰度。我们发现铁丰度在太阳和太阳尺度的[X/Fe]丰度模式的一半和三分之一之间,铁峰,α和大多数轻元素,与薄盘化学相一致。我们发现了[C/Fe]的耗尽和[N/Fe]的增强,与CN燃烧一致,以及低的12 C/13 C丰度比(9和11之间),需要额外的混合过程中的恒星内部在后主序星演化。最后,我们发现相对于太阳,[Sr/Fe]略有增加,[Y/Fe]略有减少(≤2倍)。
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.
DOI: 10.1051/0004-6361/200913373
发表时间: 2010-02
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
银河系中心 M 巨星的化学丰度:富含单一金属且低 [α/Fe] 的族群
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
球状球状星团的高分辨率红外光谱:Liller 1 和 NGC 6553
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
造父变星中的钡丰度
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