SOLAR-LIKE OSCILLATIONS IN LOW-LUMINOSITY RED GIANTS: FIRST RESULTS FROM KEPLER

SOLAR-LIKE OSCILLATIONS IN LOW-LUMINOSITY RED GIANTS: FIRST RESULTS FROM KEPLER
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低光度红巨星中的类太阳振荡:开普勒的第一个结果

DOI:
10.1088/2041-8205/713/2/l176
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发表时间:
2010
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Bedding T
Bedding T
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--
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--
作者:
Bedding T

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从开普勒使命科学运行的前34天开始,我们使用时间序列测光测量了红巨星中的类太阳振荡。光变曲线,在30分钟的采样中获得,揭示了G和K巨星的大样本中的明显振荡,从红色团块到巨型分支的底部延伸的光度。我们证实了振荡的大分离(Δν)和最大功率的频率(ν max)之间的强相关性。我们聚焦于50颗低光度恒星(Vmax> 100 μHz,L = 30 L返)的样本,这些恒星具有高信噪比,并显示出明确的类太阳振荡特征。这些都是燃烧H壳层的恒星,它们的振荡对于测试恒星演化模型和限制本地盘中星星的形成速率应该是有价值的。我们使用一种新的技术,通过缩放它们的频率来比较单个échelle图上的恒星,并找到对应于径向和非径向振荡的定义明确的脊,包括角度l= 3的模式的明确证据。通过测量l= 0和l= 2之间的微小间隔,我们可以绘制出δν 02与Δν的CD图。l= 1的恒星与相邻的l= 0模的中点之间的小间距δν 01是负的,与太阳和太阳型恒星相反。l= 1的脊明显变宽,我们将其归因于混合模式,证实了低光度巨星的理论预测。总的来说,这些结果证明了开普勒数据在红巨星星震学方面的巨大潜力。
We have measured solar-like oscillations in red giants using time-series photometry from the first 34 days of science operations of the Kepler Mission. The light curves, obtained with 30 minute sampling, reveal clear oscillations in a large sample of G and K giants, extending in luminosity from the red clump down to the bottom of the giant branch. We confirm a strong correlation between the large separation of the oscillations (Δν) and the frequency of maximum power (ν max). We focus on a sample of 50 low-luminosity stars (ν max> 100 μHz, L≲ 30 L☉) having high signal-to-noise ratios and showing the unambiguous signature of solar-like oscillations. These are H-shell-burning stars, whose oscillations should be valuable for testing models of stellar evolution and for constraining the star formation rate in the local disk. We use a new technique to compare stars on a single échelle diagram by scaling their frequencies and find well-defined ridges corresponding to radial and non-radial oscillations, including clear evidence for modes with angular degree l= 3. Measuring the small separation between l= 0 and l= 2 allows us to plot the so-called CD diagram of δν 02 versus Δν. The small separation δν 01 of l= 1 from the midpoint of adjacent l= 0 modes is negative, contrary to the Sun and solar-type stars. The ridge for l= 1 is notably broadened, which we attribute to mixed modes, confirming theoretical predictions for low-luminosity giants. Overall, the results demonstrate the tremendous potential of Kepler data for asteroseismology of red giants.
DOI: 10.1088/2041-8205/713/2/l187
发表时间: 2010-01
期刊: The Astrophysical Journal Letters
影响因子: --
作者:
S. Hekker;J. Debosscher;D. Huber;M. Hidas;J. De Ridder;C. Aerts;D. Stello;T. Bedding;R. Gilliland;J. Christensen-Dalsgaard;T. Brown;H. Kjeldsen;W. Borucki;D. Koch;J. Jenkins;H. Van Winckel;P. Beck;J. Blomme;J. Southworth;A. Pigulski;W. Chaplin;Y. Elsworth;I. Stevens;S. Dreizler;D. Kurtz;C. Maceroni;D. Cardini;A. Derekas;M. Suran
通讯作者: S. Hekker;J. Debosscher;D. Huber;M. Hidas;J. De Ridder;C. Aerts;D. Stello;T. Bedding;R. Gilliland;J. Christensen-Dalsgaard;T. Brown;H. Kjeldsen;W. Borucki;D. Koch;J. Jenkins;H. Van Winckel;P. Beck;J. Blomme;J. Southworth;A. Pigulski;W. Chaplin;Y. Elsworth;I. Stevens;S. Dreizler;D. Kurtz;C. Maceroni;D. Cardini;A. Derekas;M. Suran
DOI: --
发表时间: 2000-11
期刊: arXiv: Astrophysics
影响因子: --
作者:
H. Kjeldsen;T. Bedding
通讯作者: H. Kjeldsen;T. Bedding
对 Χ Hydrae 的脉动幅度进行建模
DOI: --
发表时间: 2002
期刊:
影响因子: --
作者:
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DOI: 10.1111/j.1365-2966.2007.11585.x
发表时间: 2007-02
影响因子: 4.8
作者:
D. Stello;D. Stello;D. Stello;H. Bruntt;H. Bruntt;H. Bruntt;H. Kjeldsen;T. Bedding;T. Arentoft;T. Arentoft;R. Gilliland;J. Nuspl;S.-L. Kim;Y. B. Kang;J. Koo;J. Lee;C. Sterken;C.‐U. Lee;H. R. Jensen;A. Jacob;R. Szabó;R. Szabó;S. Frandsen;Z. Csubry;Z. Dind;M. Bouzid;T. Dall;L. Kiss
通讯作者: D. Stello;D. Stello;D. Stello;H. Bruntt;H. Bruntt;H. Bruntt;H. Kjeldsen;T. Bedding;T. Arentoft;T. Arentoft;R. Gilliland;J. Nuspl;S.-L. Kim;Y. B. Kang;J. Koo;J. Lee;C. Sterken;C.‐U. Lee;H. R. Jensen;A. Jacob;R. Szabó;R. Szabó;S. Frandsen;Z. Csubry;Z. Dind;M. Bouzid;T. Dall;L. Kiss
DOI: 10.1553/cia160s74
发表时间: 2009-10
期刊: arXiv: Solar and Stellar Astrophysics
影响因子: --
作者:
D. Huber;D. Stello;T. Bedding;W. Chaplin;T. Arentoft;P. Quirion;H. Kjeldsen
通讯作者: D. Huber;D. Stello;T. Bedding;W. Chaplin;T. Arentoft;P. Quirion;H. Kjeldsen