Magnetic and Rotational Evolution of $ρ$ CrB from Asteroseismology with TESS
Travis S. Metcalfe, Jennifer L. van Saders, Sarbani Basu, Derek Buzasi, Jeremy J. Drake, Ricky Egeland, Daniel Huber, Steven H. Saar, Keivan G. Stassun, Warrick… 展开作者
Travis S. Metcalfe, Jennifer L. van Saders, Sarbani Basu, Derek Buzasi, Jeremy J. Drake, Ricky Egeland, Daniel Huber, Steven H. Saar, Keivan G. Stassun, Warrick H. Ball, Tiago L. Campante, Adam J. Finley, Oleg Kochukhov, Savita Mathur, Timo Reinhold, Victor See, Sallie Baliunas, Willie Soon
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11 pages of text including 6 figures and 2 tables. ApJ accepted
During the first half of main-sequence lifetimes, the evolution of rotation and magnetic activity in solar-type stars appears to be strongly coupled. Recent observations suggest that rotation rates evolve much more slowly beyond middle-age, while stellar activity continues to decline. We aim to characterize this mid-life transition by combining archival stellar activity data from the Mount Wilson Observatory with asteroseismology from the Transiting Exoplanet Survey Satellite (TESS). For two stars on opposite sides of the transition (88 Leo and $ρ$ CrB), we independently assess the mean activity levels and rotation periods previously reported in the literature. For the less active star ($ρ$ CrB), we detect solar-like oscillations from TESS photometry, and we obtain precise stellar properties from asteroseismic modeling. We derive updated X-ray luminosities for both stars to estimate their mass-loss rates, and we use previously published constraints on magnetic morphology to model the evolutionary change in magnetic braking torque. We then attempt to match the observations with rotational evolution models, assuming either standard spin-down or weakened magnetic braking. We conclude that the asteroseismic age of $ρ$ CrB is consistent with the expected evolution of its mean activity level, and that weakened braking models can more readily explain its relatively fast rotation rate. Future spectropolarimetric observations across a range of spectral types promise to further characterize the shift in magnetic morphology that apparently drives this mid-life transition in solar-type stars.
Investigating Gaia EDR3 parallax systematics using asteroseismology of Cool Giant Stars observed by Kepler, K2, and TESS I. Asteroseismic distances to 12,500 red-giant stars
Pulsating H-deficient WDs and pre-WDs observed with TESS: V. Discovery of two new DBV pulsators, WD J152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748
CHARA Interferometry and TESS Asteroseismology of the Core-Helium Burning Red Giant $κ$ Cyg
Sydney Institute for Astronomy, School of Physics, University of Sydney（悉尼大学物理学院天体物理研究所）；Institute for Astronomy, University of Hawai‘i（夏威夷大学天文研究所）；Sydney Informatics Hub, Core Research Facilities, University of Sydney（悉尼大学核心研究设施悉尼信息学中心）
Unveiling the properties of pulsating low-mass helium-core white dwarfs through TESS asteroseismology I. First results
Universidad Nacional de La Plata（拉普拉塔国立大学）；CONICET-UNLP（阿根廷国家科学研究委员会-拉普拉塔国立大学）；City University of New York Graduate Center（纽约市立大学研究生院）；KU Leuven（荷语鲁汶大学）；Queens College, City University of New York（纽约市立大学皇后学院）；Universitat Politècnica de Catalunya（加泰罗尼亚理工大学）；Boston University（波士顿大学）
Deep Learning Classification in Asteroseismology Using an Improved Neural Network: Results on 15000 Kepler Red Giants and Applications to K2 and TESS Data
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: I. Asteroseismology of the GW Vir stars RX J2117+3412, HS 2324+3944, NGC 6905, NGC 1501, NGC 2371, and K 1-16
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS VI. Asteroseismology of the GW Vir-type central star of the Planetary Nebula NGC 246
Tess asteroseismology of the known planet host star $λ^2$ Fornacis
凌日系外行星调查卫星（TESS）正在几乎整个天空中观测明亮的已知行星宿主恒星。这些恒星已经进行了广泛的地面观测，提供了大量的径向速度（RV）测量。在这项工作中，我们使用新的TESS光度观测的特点恒星$λ^2$天炉座，并在此之后更新的参数的轨道行星$λ^2$为b。我们测量了$λ^2$ For中的p模振荡频率，并结合非地震参数，使用恒星模型估计了恒星的基本性质。使用修订后的恒星属性和一个时间序列的档案RV数据从UCLES，HIRES和HARPS仪器跨越近20年，我们改装的轨道$λ^2$为b和搜索剩余的变异性的RV残差。我们发现$λ^2$ For的质量为$1.16\pm0.03$ M $_\odot$，半径为$1.63\pm0.04$ R $_\odot$，年龄为$6.3\pm0.9$ Gyr。该测量值和更新的RV测量值表明，对于$16.8^{+1.2}_{-1.3}$ M $_\oplus$的b，$λ^2$的质量小于文献估计值，即$\sim5$ M $_\oplus$。我们还检测到在RV测量的周期为33天，这可能是由于主机恒星的旋转。虽然先前文献对$λ^2$性质的估计是模糊的，但星震测量结果将这颗恒星牢牢地定位在亚巨星演化阶段的早期阶段。通常情况下，TESS只能提供短时间序列的光度数据，但通过使用星震学，仍然有可能对迄今为止只能从地面观察到的明亮恒星的性质提供严格的限制。这促使重新审查…
Asteroseismology of 35 Kepler and TESS $δ$ Scuti stars near the red edge of the instability strip. The limitations of $δ$ Scuti stars for dating open clusters
Global asteroseismology of 19,000 red giants in the TESS Continuous Viewing Zones
University of Sydney（悉尼大学）；University of Hawai‘i（夏威夷大学）；University of New South Wales（新南威尔士大学）；Massachusetts Institute of Technology（麻省理工学院）；National University of Singapore（新加坡国立大学）；Australian National University（澳大利亚国立大学）
Asteroseismology and interferometry of the F7V spectroscopic binary $χ$ Draconis A in the TESS CVZ
Aarhus University（奥胡斯大学）；University of Sydney（悉尼大学）；Macquarie University（麦考瑞大学）；Institute of Space Sciences (ICE, CSIC)（空间科学研究所（ICE，CSIC））；Institut d’Estudis Espacials de Catalunya (IEEC)（加泰罗尼亚空间研究学院）
Investigating Gaia EDR3 parallax systematics using asteroseismology of Cool Giant Stars observed by Kepler, K2, and TESS II. Deciphering Gaia parallax systematics using red clump stars
Pushing the Limit of Asteroseismic Detection for Cool Dwarfs using TESS and Deep Learning
University of Rochester（罗切斯特大学）；California Institute of Technology（加州理工学院）；University of Chicago（芝加哥大学）；Center for Astrophysics — Harvard & Smithsonian（哈佛与史密森尼天体物理中心）；Harvard University（哈佛大学）；Anton Pannekoek Institute, University of Amsterdam（阿姆斯特丹大学安东·潘内克研究所）；SRON（荷兰空间天文研究所）；Université de Moncton（蒙克顿大学）
The CubeSpec space mission. I. Asteroseismology of massive stars from time series optical spectroscopy: science requirements and target list prioritisation
上下文目前有一个从空间提供高节奏、高分辨率、时间序列光学光谱学的适当位置，可以通过使用低成本立方体卫星飞行任务来填补。欧空局领导的CubeSpec任务专门设计用于提供基于空间的低成本光谱学，具有特定的功能，可以针对特定的科学需求进行优化。CubeSpec卫星被批准为欧空局在轨演示器，其主要科学目标将侧重于获得高节奏、高分辨率的光学光谱数据，以促进脉动大质量恒星的星震学。目的。在这第一篇论文中，我们的目标是寻找脉动的大质量恒星适合的CubeSpec任务，特别是$β$ Cep星，这通常需要时间序列光谱，以确定其脉动模式的几何形状。方法.基于利用CubeSpec光谱仪的能力进行大质量恒星星震学所需的科学要求，我们将脉动的文献研究与最近的高节奏时间序列TESS光度学的分析相结合，对光谱类型介于O 9和B3之间的亮度大于V < 4等的恒星的变化进行分类。结果在90颗恒星，满足我们的星等和光谱类型的要求，我们确定23个有前途的$β$ Cep星与高振幅（非）径向脉动模式的频率低于7 d $^{-1}$。使用进一步的限制，预计旋转速度，脉动幅度和脉动模式的数量，我们设计了一个优先目标列表的CubeSpec任务根据其科学要求和潜在的目标为asteroseismology。完整的目标目录进一步提供了一个现代的TESS为基础的审查线轮廓和光度变化的明亮的O 9-B3恒星之间的属性。
