IPHAS和共生星。I.选择方法和首次发现
IPHAS and the symbiotic stars. I. Selection method and first discoveries
摘要：
共生星的研究对于理解相互作用双星系统中恒星演化的重要方面是必不可少的。然而，他们在银河系中观测到的人口却知之甚少，比预测的人口规模小一到三个数量级。IPHAS是对北银河系平面的INT测光Halalpha调查，使我们有机会在有限的星等范围内系统地、完整地搜索共生星，并发现大量新系统。提出了一种结合IPHAS和近红外（2MASS）色选择共生星候选星的方法。它使我们能够区分共生双星与正常恒星和银河系中大多数其他类型的阿尔法发射线恒星。唯一的例外是金牛座T星，但可以识别，因为它们集中在恒星形成区。使用这些选择标准，我们讨论了4338 IPHAS星的列表中的H α发射的分类。其中1500到2000颗可能是Be星。在剩下的天体中，有1183颗符合我们的光度限制，被认为是候选共生星。其中三个天体是IPHAS发现的第一批新的共生星，它们的光谱确认证明了调查和选择方法的潜力。
英文摘要：
The study of symbiotic stars is essential to understand important aspects of stellar evolution in interacting binaries. Their observed population in the Galaxy is however poorly known, and is one to three orders of magnitudes smaller than the predicted population size. IPHAS, the INT Photometric Halpha survey of the Northern Galactic plane, gives us the opportunity to make a systematic, complete search for symbiotic stars in a magnitude-limited volume, and discover a significant number of new systems. A method of selecting candidate symbiotic stars by combining IPHAS and near-IR (2MASS) colours is presented. It allows us to distinguish symbiotic binaries from normal stars and most of the other types of Halpha emission line stars in the Galaxy. The only exception are T Tauri stars, which can however be recognized because of their concentration in star forming regions. Using these selection criteria, we discuss the classification of a list of 4338 IPHAS stars with Halpha in emission. 1500 to 2000 of them are likely to be Be stars. Among the remaining objects, 1183 fulfill our photometric constraints to be considered candidate symbiotic stars. The spectroscopic confirmation of three of these objects, which are the first new symbiotic stars discovered by IPHAS, proves the potential of the survey and selection method.
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