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arXiv 2401.07413astro-ph.SR
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利用TESS 10分钟全帧图像在狭窄的Gaia颜色范围内识别850颗delta Scuti脉动星

Identifying 850 delta Scuti pulsators in a narrow Gaia colour range with TESS 10-minute full-frame images

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);School of Physics, University of New South Wales(新南威尔士大学物理学院);UNSW Data Science Hub, University of New South Wales(新南威尔士大学数据科学中心);Institute for Astronomy, University of Hawai‘i(夏威夷大学天体物理研究所);Centre for Astrophysics, University of Southern Queensland(南昆士兰大学天体物理学中心)

Amelie K. Read, Timothy R. Bedding, Prasad Mani, Benjamin T. Montet, Courtney Crawford, Daniel R. Hey, Yaguang Li, Simon J. Murphy, May Gade Pedersen, Joachim Kruger

AI总结:

利用TESS 10分钟图像在Gaia颜色范围内识别850颗delta Scuti星,发现高频脉动模式并确认TESS和Gaia在研究脉动星方面的有效性。

摘要:

我们利用TESS 10分钟全帧图像(第27至55扇区)研究了一组1708颗距离太阳500光年内、位于delta Scuti不稳定性带中心的狭窄颜色范围(0.29 < BP-RP < 0.31)的恒星。基于傅里叶幅度谱,我们识别出848颗delta Scuti星,以及47颗食双星或接接触双星。一些delta Scuti星的最强脉动模式落在基本径向模的周期-光度关系上,但许多对应于频率大约高一倍的高阶谐波。许多低光度delta Scuti星显示出一系列具有非常规则间隔的高频模式。我们样本中显示delta Scuti脉动的恒星比例约为70%(G<8),与开普勒的结果一致。然而,对于更暗的恒星,比例降至约45%,我们发现单个TESS扇区的数据只能检测到大约G=9的恒星中约50 ppm的最低振幅delta Scuti脉动。最后,我们发现了四颗新的高频delta Scuti星,具有非常规则的模式图案,并在lambda Mus中检测到脉动,使其成为天空中第四亮的delta Scuti星(G=3.63)。总体而言,这些结果证实了TESS和Gaia在研究脉动星方面的强大能力。

英文摘要:

We use TESS 10-minute Full Frame Images (Sectors 27-55) to study a sample of 1708 stars within 500 pc of the Sun that lie in a narrow colour range in the centre of the delta Scuti instability strip (0.29 < BP-RP < 0.31). Based on the Fourier amplitude spectra, we identify 848 delta Scuti stars, as well as 47 eclipsing or contact binaries. The strongest pulsation modes of some delta Scuti stars fall on the period-luminosity relation of the fundamental radial mode but many correspond to overtones that are approximately a factor of two higher in frequency. Many of the low-luminosity delta Scuti stars show a series of high-frequency modes with very regular spacings. The fraction of stars in our sample that show delta Scuti pulsations is about 70% for the brightest stars (G<8), consistent with results from Kepler. However, the fraction drops to about 45% for fainter stars and we find that a single sector of TESS data only detects the lowest-amplitude delta Scuti pulsations (around 50 ppm) in stars down to about G=9. Finally, we have found four new high-frequency delta Scuti stars with very regular mode patterns, and have detected pulsations in lambda Mus that make it the fourth-brightest delta Scuti in the sky (G=3.63). Overall, these results confirm the power of TESS and Gaia for studying pulsating stars.

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