arXiv 2111.093522021-11-17astro-ph.SR

用TESS发现两颗新的roAp星

Two New roAp Stars Discovered with TESS

Rahul Jayaraman, Donald W. Kurtz, Gerald Handler, Saul Rappaport, George Ricker

备注：: 4 pages, 1 figure, accepted for publication in RNAAS
DOI：: 10.3847/2515-5172/ac3a8a

摘要：

本文介绍了在TESS测光数据中发现的两颗新的快速振荡Ap（roAp）星，TIC 198781841和TIC 229960986。TIC 198781841的周期图在166.506 d $^{-1}$（1.93 mHz）处有一个大峰，在163.412 d $^{-1}$（1.89 mHz）和169.600 d $^{-1}$（1.96 mHz）处有两个附近的峰。这些对应于三个独立的高泛音压力模式，具有交替的偶数和奇数$\ell$值。TIC 229960986具有中心在191.641 d $^{-1}$（2.218 mHz）的高频三重峰，边带在191.164 d $^{-1}$（2.213 mHz）和192.119 d $^{-1}$（2.224 mHz）。这种脉动似乎是一个旋转分裂偶极模式，边带振幅显着大于中央峰值，因此，两个脉动极点被视为在旋转周期。我们的光度鉴定两个新的roAp星强调了TESS的显着能力，以确定高频embryos没有光谱观测。

英文摘要：

We present two new rapidly oscillating Ap (roAp) stars, TIC 198781841 and TIC 229960986, discovered in TESS photometric data. The periodogram of TIC 198781841 has a large peak at 166.506 d$^{-1}$ (1.93 mHz), with two nearby peaks at 163.412 d$^{-1}$ (1.89 mHz) and 169.600 d$^{-1}$ (1.96 mHz). These correspond to three independent high-overtone pressure modes, with alternating even and odd $\ell$ values. TIC 229960986 has a high-frequency triplet centered at 191.641 d$^{-1}$ (2.218 mHz), with sidebands at 191.164 d$^{-1}$ (2.213 mHz) and 192.119 d$^{-1}$ (2.224 mHz). This pulsation appears to be a rotationally split dipole mode, with sideband amplitudes significantly larger than that of the central peak; hence, both pulsation poles are seen over the rotation cycle. Our photometric identification of two new roAp stars underscores the remarkable ability of TESS to identify high-frequency pulsators without spectroscopic observations.

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英文摘要：

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