标题： 猎户座分子云中极低光度年轻恒星天体的近红外光谱 显示英文标题

标题： Near-Infrared Spectroscopy of Very Low-Luminosity Young Stellar Objects in the Taurus Molecular Cloud

摘要： 我们对猎户座云2中的23个非常低光度的年轻恒星天体（YSO）候选体及其5个伴星进行了近红外光谱观测，猎户座云2是金牛座分子云最密集的部分之一。通过Br伽玛特征确认了12个天体为YSOs。YSOs和伴星的有效温度通过2.26微米特征、2.21微米特征以及H2O带强度来估计。我们测光和光谱观测的详细比较与赫罗图上的演化轨迹表明，一些天体可能是非常低质量的YSOs。 显示英文摘要

摘要： We have carried out near-infrared spectroscopic observations of 23 very low-luminosity young stellar object (YSO) candidates and 5 their companions in Heiles Cloud 2, one of the densest parts of the Taurus molecular cloud. Twelve objects were confirmed as YSOs by Br gamma feature. The effective temperatures of the YSOs and of the companions are estimated from the 2.26 micron feature, the 2.21 micron feature, and the H2O band strengths. Detailed comparisons of our photometric and spectroscopic observations with evolutionary tracks on the HR diagram suggest some objects to be very low-mass YSOs.