标题： 光谱能量分布对于盘和晕M型矮星 显示英文标题

标题： Spectral Energy Distributions for Disk and Halo M--Dwarfs

摘要： 我们获得了42个晕星和盘星的红外（1到2.5微米）光谱，其光谱类型为M1到M6.5。 这些数据与Allard & Hauschildt最新模型大气生成的合成光谱进行了比较。 确定了样本的光球参数金属量、有效温度和半径。 我们发现观测结果与理论有很好的一致性，除了由于金属氢化物和水的分子数据不完整导致的已知问题。 金属贫乏的M亚矮星在本情况下由于氧化物辐射率来源的重要性较低，因此与模型匹配良好。 样本的衍生有效温度范围从3600K到2600K；在这些温度下，颗粒形成和消光在光球中并不显著。 衍生的金属量范围从太阳金属量到十分之一太阳金属量。 半径和有效温度的推导结果与低质量恒星的最新模型一致。 显示英文摘要

摘要： We have obtained infrared (1 to 2.5 micron) spectroscopy for 42 halo and disk dwarfs with spectral type M1 to M6.5. These data are compared to synthetic spectra generated by the latest model atmospheres of Allard & Hauschildt. Photospheric parameters metallicity, effective temperature and radius are determined for the sample. We find good agreement between observation and theory except for known problems due to incomplete molecular data for metal hydrides and water. The metal-poor M subdwarfs are well matched by the models as oxide opacity sources are less important in this case. The derived effective temperatures for the sample range from 3600K to 2600K; at these temperatures grain formation and extinction are not significant in the photosphere. The derived metallicities range from solar to one-tenth solar. The radii and effective temperatures derived agree well with recent models of low mass stars.