BIS天体的光谱特性和光变
Spectral Properties and Variability of BIS objects
摘要：
通过分析和解释新获得的和文献数据，我们澄清了调查不足的IRAS点源的性质，被归类为晚型星，属于Byurakan IRAS ~星表。从95颗恒星的中分辨率光谱中，我们对47个光谱类型进行了强有力的修正，并对31个源进行了新的分类。9颗星为G型或K型，4颗为N型碳星，其余为M型星。从文献和新的光度观测，我们研究了它们的变化行为。对于常规变量，我们确定了距离，绝对星等和质量损失率。对于其他恒星，我们估计的距离在1.3到10~kpc之间，中位数为2.8~kpc，表明BIS星大多属于晕族。
英文摘要：
Through the analysis and interpretation of newly obtained and of literature data we have clarified the nature of poorly investigated IRAS point sources classified as late type stars, belonging to the Byurakan IRAS ~Stars catalog. From medium resolution spectroscopyof 95 stars we have strongly revised 47 spectral types and newly classified 31 sources. Nine stars are of G or K types, four are N carbon stars in the Asymptotic Giant Branch, the others being M type stars. From literature and new photometric observations we have studied their variability behaviour. For the regular variables we determined distances, absolute magnitudes and mass loss rates. For the other stars we estimated the distances, ranging between 1.3 and 10~kpc with a median of 2.8~kpc from the galactic plane, indicating that BIS stars mostly belong to the halo population.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
