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arXiv 1102.2231astro-ph.SR
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探测疏散星团:开普勒对NGC 6791和NGC 6819性质的星震约束

Sounding open clusters: asteroseismic constraints from Kepler on the properties of NGC 6791 and NGC 6819

Sarbani Basu, Frank Grundahl, Dennis Stello, Thomas Kallinger, Saskia Hekker, Benoit Mosser, Rafael A. Garcia, Savita Mathur, Karsten Brogaard, Hans Bruntt, Wil… 展开作者

Sarbani Basu, Frank Grundahl, Dennis Stello, Thomas Kallinger, Saskia Hekker, Benoit Mosser, Rafael A. Garcia, Savita Mathur, Karsten Brogaard, Hans Bruntt, William J. Chaplin, Ning Gai Yvonne Elsworth, Lisa Esch, Jerome Ballot, Timothy R. Bedding, Michael Gruberbauer, Daniel Huber, Andrea Miglio, Mutlu Yildiz, Hans Kjeldsen, Joergen Christensen-Dalsgaard, Ronald L. Gilliland, Michael M. Fanelli, Khadeejah A. Ibrahim, Jeffrey C. Smith

摘要:

我们提出的一些性质的疏散星团NGC 6791和NGC 6819来自美国宇航局的开普勒任务获得的asteroseismic数据的初步结果。除了估计这些星团红巨星分支上恒星的质量、半径和log g外,我们还估计了到星团的距离和它们的年龄。我们对NGC 6791的距离模的模型无关估计是(m-M)_0= 13.11 \pm 0.06。我们发现NGC 6819的(m-M)_0= 11.85 \pm 0.05。NGC 6791红巨星分支上恒星的平均质量为1.20 \pm 0.01 M太阳,而NGC 6819的平均质量为1.68 \pm 0.03 M太阳。应该注意的是,我们没有涵盖整个红巨星分支的数据,实际质量会略低。我们已经确定了这些集群的年龄依赖模型的估计。我们发现NGC 6791的年龄在6.8到8.6 Gyr之间,然而,大多数模型给出的年龄都在7 Gyr左右。我们得到的年龄在2和2.4 Gyr之间的NGC 6819。

英文摘要:

We present initial results on some of the properties of open clusters NGC 6791 and NGC 6819 derived from asteroseismic data obtained by NASA's Kepler mission. In addition to estimating the mass, radius and log g of stars on the red-giant branch of these clusters, we estimate the distance to the clusters and their ages. Our model-independent estimate of the distance modulus of NGC 6791 is (m-M)_0= 13.11\pm 0.06. We find (m-M)_0= 11.85\pm 0.05 for NGC 6819. The average mass of stars on the red-giant branch of NGC 6791 is 1.20 \pm 0.01 M_sun, while that of NGC 6819 is 1.68\pm 0.03M_sun. It should be noted that we do not have data that cover the entire red-giant branch and the actual mass will be somewhat lower. We have determined model-dependent estimates of ages of these clusters. We find ages between 6.8 and 8.6 Gyr for NGC 6791, however, most sets of models give ages around 7Gyr. We obtain ages between 2 and 2.4 Gyr for NGC 6819.

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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