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arXiv 2407.05075astro-ph.SRastro-ph.IM
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通过TESS观测揭示七颗大振幅Delta Sct恒星的脉动特征

Signature of high-amplitude pulsations in seven Delta Sct stars via TESS observations

Fatemeh Vasigh, Elham Ziaali, Hossein Safari

AI总结:

本研究利用TESS数据分析七颗振幅大于0.3星等的HADS恒星,识别其单、双及三径向脉动模式,并结合176颗恒星建立金属丰度标度关系。

摘要:

大振幅Delta Sct(HADS)恒星的规则脉动行为为研究恒星内部提供了更大机会。我们分析了TESS新近观测到的七颗峰峰值振幅超过0.3星等的HADS恒星。研究发现,TIC374753270、TIC710783和TIC187386415以基频径向模式脉动;此外,TIC130474019和TIC160120432呈现双径向模式。另一方面,TIC148357344和TIC 278119167表现出三模式行为。分析表明,这七颗恒星在赫罗图中靠近(内部)不稳定带的红边。这七个目标的基频模式遵循Delta Sct恒星的周光(PL)关系。然而,TIC278119167略微偏离基频PL关系。双模式和三模式HADS恒星(TIC130474019、TIC160120432、TIC148357344和TIC278119167)与周期比范围(基频与一阶和二阶泛音之比)一致。利用176颗HADS恒星的信息(Netzel和Smolec),我们发现金属丰度([Fe/H])与质量(M)、光度(L)、有效温度(Teff)和基频周期(P0)之间存在标度关系([Fe/H] ~log((M**7.95±0.15)(L**-1.83±0.11)(P0**0.79±0.14)(Teff**0.047±0.02)))。我们估计这七颗新识别HADS恒星的金属丰度范围为-0.62至0.37 dex。

英文摘要:

The regular behavior of the pulsations of high-amplitude Delta Sct (HADS) stars gives a greater chance to investigate the interiors of stars. We analyzed seven HADS stars showing peak-to-peak amplitudes of more than 0.3 mag that were newly observed by TESS. We obtained that TIC374753270, TIC710783, and TIC187386415 pulsate in fundamental radial mode, also, TIC130474019 and TIC160120432 show double radial modes. On the other hand, TIC148357344 and TIC 278119167 demonstrate triple-mode behavior. Our analysis shows that these seven stars are close to the red edge of the (inside) instability strip in the Hertzsprung Russell diagram. The fundamental mode of these seven targets follows the period-luminosity (PL) relation for Delta Sct stars. However, TIC278119167 deviates slightly from the fundamental PL relation. The double-mode and triple-mode HADS stars (TIC130474019, TIC160120432, TIC148357344, and TIC278119167) are in agreement with the period ratio ranges (fundamental to first and second overtones). Using the information of 176 HADS stars (Netzel and Smolec), we find a scaling relation ([Fe/H] ~log((M**7.95+-0.15)(L**-1.83+-0.11)(P0**0.79+-0.14)(Teff**0.047+-0.02))) between the metallicity ([Fe/H]) and mass (M), luminosity (L), effective temperature (Teff), and the fundamental period (P0). We estimate the metallicity of the seven newly identified HADS stars ranging from -0.62 to 0.37 dex.

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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