HDE 344787，比北极星更有趣的北极星星座
HDE 344787, the Polaris Analogue that is Even More Interesting than Polaris
摘要：
在过去五年中收集的积极光度观测，过去120年的档案数据，1984年的径向速度观测，以及最近通过专业-业余合作进行的监测表明，9等F9 Ib超巨星HDE 344787是一个振幅极小的双模造父变星。它显示出与奇异的造父变星北极星非常相似，但更为极端的特性，包括快速增加的周期和振幅减小的正弦光变化，这表明脉动稳定性可能早在2045年就出现了。与北极星不同的是，HDE 344787在5.4和3.8天的周期内显示正弦光变化，对应于典型的基本模式和泛音脉动。但它可能与北极星类似，有助于定义造父变星的一小群，这些变星显示出与第一次穿越不稳定带一致的特征。2010年更新了对这颗引人注目的恒星的观测。
英文摘要：
A collection of active photometric observations over the last half decade, archival data from the past 120 years, radial velocity observations from 1984, and recent monitoring through a pro-am collaboration reveal that the 9th magnitude F9 Ib supergiant HDE 344787 is a double-mode Cepheid variable of extremely small amplitude. It displays remarkably similar, but much more extreme, properties to the exotic Cepheid Polaris, including a rapidly-increasing period and sinusoidal light variations of decreasing amplitude suggesting that pulsational stability may occur as early as 2045. Unlike Polaris, HDE 344787 displays sinusoidal light variations at periods of both 5.4 and 3.8 days, corresponding to canonical fundamental mode and overtone pulsation. But it may be similar to Polaris in helping to define a small subgroup of Cepheids that display characteristics consistent with a first crossing of the instability strip. An update of 2010 observations of this remarkable star is presented.
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