论文标题
BD+14 $^\ circ $ 3061：银河系中的发光黄色后星星
BD+14$^\circ$3061: A Luminous Yellow Post-AGB Star in the Galactic Halo
论文作者
论文摘要
我报告发现的发现是，9级银河系 - halo star bd+14 $^\ circ $ 3061是稀有的发光金属贫困的“黄色后AGB”星的成员。它的GAIA DR2视差意味着绝对幅度为$ M_V = -3.44 \ PM0.27 $，它是在逆行银河轨道上移动的非常高的恒星。 BD+14 $^\ Circ $ 3061是在银河球状簇中已知的六个黄色PAGB星的场类似物，它们的绝对幅度非常相似。这些物体是旧恒星种群的视觉上最亮的成员。它们显然狭窄的光度功能使它们有可能用作人口II标准蜡烛。 BD+14 $^\ CIRC的光谱 - 能量分布$ 3061耗资至$ 22 \，μ$ m，没有证据表明有偶性灰尘。恒星是低振幅半规则脉动变量，典型的周期为30-32天。一项径向速度研究表明，它是一个光谱二进制，周期为429.6天，使其类似于已知的二进制黄色PAGB恒星，例如HD 46703和BD+39 $^\ circ $ 4926。
I report the discovery that the 9th-magnitude Galactic-halo star BD+14$^\circ$3061 is a member of the rare class of luminous metal-poor "yellow post-AGB" stars. Its Gaia DR2 parallax implies an absolute magnitude of $M_V=-3.44\pm0.27$, and it is a very high-velocity star moving in a retrograde Galactic orbit. BD+14$^\circ$3061 is a field analog of the half-dozen yellow PAGB stars known in Galactic globular clusters, which have closely similar absolute magnitudes. These objects are the visually brightest members of old stellar populations; their apparently narrow luminosity function makes them potentially useful as Population II standard candles. The spectral-energy distribution of BD+14$^\circ$3061 out to $22\,μ$m shows no evidence for circumstellar dust. The star is a low-amplitude semi-regular pulsating variable, with typical periods of 30-32 days. A radial-velocity study suggests that it is a spectroscopic binary with a period of 429.6 days, making it similar to known binary yellow PAGB stars such as HD 46703 and BD+39$^\circ$4926.
