Wu Hong1; Wu Chaojian2; Cao Chen3; Wolf Sebastian4; Hu Jingyao1
Source Publicationresearchinastronomyandastrophysics
AbstractWe present the optical to mid-infrared SEDs of 11 debris disk candidates from Spitzer SWIRE fields. All the candidates are selected from SWIRE 24 μm sources matched with both the SDSS star catalog and the 2MASS point source catalog. They show an excess in the mid-infrared at 24 μm (Ks-24vega 〉 0.44), indicating the presence of a circumstellar dust disk. The observed optical spectra show that they are all late-type main-sequence stars covering the spectral types of FGKM. Their fractional luminosities are well above 5× 10-5, even up to the high fractional luminosity of 1×10-3. The high galactic latitudes of SWIRE fields indicate that most of these candidates could belong to the oldest stars in the thick disk. Our results indicate that high fractional luminosity debris disks could exist in old solar-like star systems, though they are still quite rare. Their discovery at high galactic latitudes also provides an exellent opportunity for further study of the properties and evolution of debris disks in regions of the Galaxy with low densities of ISM, called ISM poor environments.
Document Type期刊论文
2.Department of Astronomy,Beijing Normal University
3.Institute of Space Science and Physics,Shandong University at Weihai
4.Max Planck Institute for Astronomy
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wu Hong,Wu Chaojian,Cao Chen,et al. thedebrisdiskcandidateseleven24mexcessstarsinthespitzerswirefields[J]. researchinastronomyandastrophysics,2012,012(005):513.
APA Wu Hong,Wu Chaojian,Cao Chen,Wolf Sebastian,&Hu Jingyao.(2012).thedebrisdiskcandidateseleven24mexcessstarsinthespitzerswirefields.researchinastronomyandastrophysics,012(005),513.
MLA Wu Hong,et al."thedebrisdiskcandidateseleven24mexcessstarsinthespitzerswirefields".researchinastronomyandastrophysics 012.005(2012):513.
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