English

Bright 22 $\mu$m Excess Candidates from WISE All-Sky Catalog and Hipparcos Main Catalog

Solar and Stellar Astrophysics 2013-10-10 v1

Abstract

In this paper we present a catalog which includes 141 bright candidates (10.27\leq10.27 mag, V band) showing the infrared (IR) excess at 22 μ\mum. Of which, 38 stars are known IR excess stars or disk, 23 stars are double or multiple stars and 4 are Be stars. While the remaining more than 70 stars are identified as the 22 μ\mum excess candidates in our work. The criterion of selecting candidates is Ks[22]μmK_s-[22]_{\mu m}. All these candidates are selected from \emph{WISE} All-sky data cross-correlated with \emph{Hipparcos} Main Catalog and the likelihood-ratio technique is employed. Considering the effect of background, we introduce the \emph{IRAS} 100 μ\mum level to exclude the high background. We also estimated the coincidence probability of these sources. In addition, we presented the optical to mid-infrared SEDs and optical images of all the candidates, and gave the observed optical spectra of 6 stars with NAOC's 2.16-m telescope. To measure for the dust amount 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-solar planets, we cross-matched our catalog with known IR-excess stars having planets but none is matched. Finally, we give the fraction of stars showing IR-excess for different spectral type of main-sequence stars.

Keywords

Cite

@article{arxiv.1308.3848,
  title  = {Bright 22 $\mu$m Excess Candidates from WISE All-Sky Catalog and Hipparcos Main Catalog},
  author = {Chao-Jian Wu and Hong Wu and Man-I Lam and Ming Yang and Xiao-Qing Wen and Shuo Li and Tong-Jie Zhang and Liang Gao},
  journal= {arXiv preprint arXiv:1308.3848},
  year   = {2013}
}

Comments

45 pages, 16 figures, 4 tables. Accepted for publication in ApJS