M dwarf stars-the by-product of X-ray selected AGN candidates
  • 【摘要】

    X-ray loud M dwarfs are a major source of by-products (contamination)in the X-ray band of the multiwavelength quasar survey.As a by-product,the low dispersion spectra of 22 M dwarfs are obtained in wh... 展开>>X-ray loud M dwarfs are a major source of by-products (contamination)in the X-ray band of the multiwavelength quasar survey.As a by-product,the low dispersion spectra of 22 M dwarfs are obtained in which the spectra of 16 sources are taken for the first time.The spectral types and distances of the sample arc given based on spectral indices CaH2,CaH3,and TiOS.The parameter (ι)TiO/CaH is calculated to separate the different metallicity classes among dwarfs,subdwarfs and extreme subdwarfs.We also discuss the distributions in the diagrams of log( Lx/ Lbol),the ratio between X-ray and bolometric luminosity versus spectral type and infrared colors. 收起<<

  • 【作者】

  • 【作者单位】

    Department of Astronomy/Kitt Peak National Observatory/Max-Planck-Institute für Extraterrestrische Physik

  • 【刊期】

    天文和天体物理学研究 ISTIC SCI 2012年4期

  • 【关键词】

    spectroscopic-stars  X-rays  M dwarfs 

  • 【基金项目】

    The Scientific Research Foundation of Beijing Normal University and the National Natural Science Foundation of China The Open Project Program of the Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences