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Title: BRIGHT 22 μm EXCESS CANDIDATES FROM THE WISE ALL-SKY CATALOG AND THE HIPPARCOS MAIN CATALOG

In this paper, we present a catalog that includes 141 bright candidates (≤10.27 mag, V band) showing an excess of infrared (IR) at 22 μm. Of these 141 candidates, 38 stars are known IR-excess stars or disks, 23 stars are double or multiple stars, and 4 are Be stars while the remaining more than 70 stars are identified as 22 μm excess candidates in our work. The criterion for selecting candidates is K{sub s} – [22]{sub μm}. All these candidates are selected from the Wide-field Infrared Survey Explorer all-sky data cross-correlated with the Hipparcos main catalog and the likelihood-ratio technique is employed. Considering the effect of background, we introduce the IRAS 100 μm level to exclude the high background. We also estimate the coincidence probability of these sources. In addition, we present the optical to mid-IR spectral energy distributions and optical images for all the candidates, and give the observed optical spectra of six stars with the National Astronomical Observatories, Chinese Academy of Sciences' 2.16 m telescope. To measure for the amount of dust around each star, the fractional luminosity is also provided. We also test whether our method of selecting IR-excess stars can be used to search for extra-solarmore » planets; we cross-match our catalog with known IR-excess stars with planets but found no matches. Finally, we give the fraction of stars showing excess IR for different spectral types of main-sequence stars.« less
Authors:
; ; ; ;  [1] ;  [2] ;  [3] ;  [4]
  1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
  2. Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
  3. Department of Astronomy, Peking University, Beijing 100871 (China)
  4. Department of Astronomy, Beijing Normal University, Beijing 100875 (China)
Publication Date:
OSTI Identifier:
22273318
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal, Supplement Series; Journal Volume: 208; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; COSMIC DUST; ENERGY SPECTRA; INFRARED SPECTRA; INFRARED SURVEYS; INTERMEDIATE INFRARED RADIATION; LUMINOSITY; MAIN SEQUENCE STARS; PLANETS; PROBABILITY; PROTOPLANETS; TELESCOPES