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arXiv 2201.11131astro-ph.SR
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“长颈鹿”：在与${\sim}2~M_\odot$低巨星相互作用的双星中发现剥离红巨星

The "Giraffe": Discovery of a stripped red giant in an interacting binary with a ${\sim}2~M_\odot$ lower giant

T. Jayasinghe, Todd A. Thompson, C. S. Kochanek, K. Z. Stanek, D. M. Rowan, D. V. Martin, Kareem El-Badry, P. J. Vallely, J. T. Hinkle, D. Huber, H. Isaacson, J… 展开作者

T. Jayasinghe, Todd A. Thompson, C. S. Kochanek, K. Z. Stanek, D. M. Rowan, D. V. Martin, Kareem El-Badry, P. J. Vallely, J. T. Hinkle, D. Huber, H. Isaacson, J. Tayar, K. Auchettl, I. Ilyin, A. W. Howard, C. Badenes

备注：
Revised version of the paper following comments from the referee, submitted to MNRAS. arXiv admin note: text overlap with arXiv:2101.02212
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摘要：

我们报告了一个剥离巨星+低巨星双星2 M04123153 +6738486（2 M0412）的发现，在寻找非相互作用的紧凑型物星双星。2 M0412是一颗演化的（$T_{\rm eff, giant}\simeq4000$ K）、明亮的（$L_{\rm giant}\simeq150~L_\odot$）红巨星，位于$P=81.2$日双星中。2 M0412是一颗已知的变星，之前被归类为半规则变星。后续Keck/HIRES和LBT/PEPSI光谱的互相关函数显示具有隐含质量比$q=M_{\rm giant}/M_{\rm comp}\simeq0.20\pm0.01$的RV可变第二组分。ASAS-SN、ATLAS、TESS和ZTF光变曲线表明该巨星是一颗洛希叶填充椭球变星，倾角为$49.4^\circ{}\pm{0.3^{\circ}}$，质量为$M_{\rm giant}=0.38\pm0.01~ M_\odot$，距离为$\simeq3.7$ kpc。这颗巨星的质量表明它的外壳已经被剥离。红巨星分支下部的巨星伴星质量为$M_{\rm comp}=1.91\pm0.03~M_\odot$，其中有$T_{\rm eff, comp}\simeq5000$ K、$L_{\rm comp}\simeq60~L_\odot$和$R_{\rm comp}\simeq11~R_\odot$。我们还确定了一个轨道相位相关的，广泛的$\rm Hα$发射线，这可能表明正在进行的吸积从剥离红巨星到同伴。

英文摘要：

We report the discovery of a stripped giant + lower giant binary, 2M04123153+6738486 (2M0412), identified during a search for non-interacting compact object-star binaries. 2M0412 is an evolved ($T_{\rm eff, giant}\simeq4000$ K), luminous ($L_{\rm giant}\simeq150~L_\odot$) red giant in a circular $P=81.2$ day binary. 2M0412 is a known variable star previously classified as a semi-regular variable. The cross-correlation functions of follow-up Keck/HIRES and LBT/PEPSI spectra show an RV-variable second component with implied mass ratio $q=M_{\rm giant}/M_{\rm comp}\simeq0.20\pm0.01$. The ASAS-SN, ATLAS, TESS and ZTF light curves show that the giant is a Roche lobe filling ellipsoidal variable with an inclination of $49.4^\circ{}\pm{0.3^{\circ}}$, and a giant mass of $M_{\rm giant}=0.38\pm0.01~ M_\odot$ for a distance of $\simeq3.7$ kpc. The mass of the giant indicates that its envelope has been stripped. The giant companion on the lower red giant branch has a mass of $M_{\rm comp}=1.91\pm0.03~M_\odot$ with $T_{\rm eff, comp}\simeq5000$ K, $L_{\rm comp}\simeq60~L_\odot$ and $R_{\rm comp}\simeq11~R_\odot$. We also identify an orbital phase dependent, broad $\rm Hα$ emission line which could indicate ongoing accretion from the stripped red giant onto the companion.

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