These are not the Stars You are Looking for: On the Detection of X-Ray Emission from HD 143352
These are not the Stars You are Looking for: On the Detection of X-Ray Emission from HD 143352
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DOI：
10.3847/2515-5172/abf046
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
S. Graber;R. Montez
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作者：
S. Graber;R. Montez
作为对金牛座RV型变星X射线发射研究的一部分，我们意外地探测到了距离最近的金牛座RV型变星HD 143352的X射线。在0.2 - 2.0 keV能段探测到了X射线，且大部分计数在0.5 - 1.0 keV能段被探测到。该辐射与温度为10⁶ K的等离子体相符，且X射线光度$L_X\sim2\times10^{28} \text{ erg s}^{-1}$。这将是第二颗被探测到有X射线发射的金牛座RV型变星。然而，在通过光谱能量分布估算出温度（$T_{\text{eff}}\sim6000 \text{ K}$）和热光度（$L_{\text{bol}}\sim4L_{\odot}$）之后，我们确定HD 143352位于主序星阶段。这些恒星参数表明HD 143352既不是金牛座RV型变星，也不是渐近巨星分支后星或超巨星，而是一颗早F型主序星。从HD 143352探测到的X射线辐射与日冕状辐射相符，$L_X/L_{\text{bol}}\sim10^{-6}$。
As part of a search for X-ray emission from RV Tau variable stars, we discovered a serendipitous X-ray detection of the closest RV Tau variable star, HD 143352. X-rays were detected in the 0.2–2.0 keV energy band, with most counts detected in the 0.5–1.0 keV band. The emission is consistent with a 106 K plasma and L X ∼ 2 × 1028 erg s−1. This would be the second RV Tau star detected in X-ray emission. However, after estimating the temperature (T eff ∼ 6000 K) and bolometric luminosity (L bol ∼ 4L ⊙) from the spectral energy distribution, we place HD 143352 on the main sequence. These stellar parameters suggest HD 143352 is neither an RV Tau variable nor a post-asymptotic giant branch star nor a super giant, but rather an early F-type main sequence star. The X-ray emission detected from HD 143352 is consistent with coronal-like emission with L X/L bol ∼ 10−6.