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arXiv 1609.04280astro-ph.SR
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CoRoT-GES协作。用星震学改进红巨星光谱表面重力和丰度

The CoRoT-GES Collaboration. Improving Red Giants spectroscopic surface gravity and abundances with asteroseismology

M. Valentini, C. Chiappini, A. Miglio, J. Montalbán, T. Rodrigues, B. Mosser, F. Anders

摘要:

如今,大型光谱巡天,如盖亚-ESO巡天(GES),为更好地研究银河系的形成和演化提供了独特的恒星数据库。必须高度重视导出的基本恒星性质的准确性:恒星参数的不确定性导致丰度、距离和年龄的不确定性。天文地震学在这方面具有关键作用:当地震信息与光谱分析得出的信息相结合时,可以获得关于红巨星距离、质量、灭绝和年龄的高度精确的限制。鉴于这一有希望的联合行动,我们开始了CoRoT-GES合作。本文介绍了GES在2011年12月至2014年7月期间观测到的1,111颗CoRoT星,这些恒星属于CoRoT场LRc01,指向银河系内盘。其中534颗星具有可靠的全球地震参数。通过结合地震信息和光谱学,我们得到了精确的恒星参数,年龄,运动学和轨道参数和详细的元素丰度的恒星样本。我们还表明,由于asteroseismology,我们能够获得更高的精度比可以实现的标准光谱手段。这个样本的CoRoT红巨人,跨越银河系中心距离从5到8千秒差距和广泛的年龄间隔(1 - 13 Gyrs),为我们提供了一个代表性的样本内盘人口。

英文摘要:

Nowadays large spectroscopic surveys, like the Gaia-ESO Survey (GES), provide unique stellar databases for better investigating the formation and evolution of our Galaxy. Great attention must be paid to the accuracy of the basic stellar properties derived: large uncertainties in stellar parameters lead to large uncertainties in abundances, distances and ages. Asteroseismology has a key role in this context: when seismic information is combined with information derived from spectroscopic analysis, highly precise constraints on distances, masses, extinction and ages of Red Giants can be obtained. In the light of this promising joint-action, we started the CoRoT-GES collaboration. We present a set of 1,111 CoRoT stars, observed by GES from December 2011 to July 2014, these stars belong to the CoRoT field LRc01, pointing at the inner Galactic Disk. Among these stars, 534 have reliable global seismic parameters. By combining seismic informations and spectroscopy, we derived precise stellar parameters, ages, kinematic and orbital parameters and detailed element abundances for this sample of stars. We also show that, thanks to asteroseismology, we are able to obtain a higher precision than what can be achieved by the standard spectroscopic means. This sample of CoRoT Red Giants, spanning Galactocentric distances from 5 to 8 kpc and a wide age interval (1-13 Gyrs), provides us a representative sample for the inner disk population.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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