Journal article

The UV Emission of Stars in the LAMOST Survey. I. Catalogs

Yu Bai, JiFeng Liu, James Wicker, Song Wang, JinCheng Guo, YuXiang Qin, Lin He, JianLing Wang, Yue Wu, YiQiao Dong, Yong Zhang, Yonghui Hou, Yuefei Wang, Zihuang Cao

The Astrophysical Journal Supplement Series | IOP PUBLISHING LTD | Published : 2018

Abstract

We present the ultraviolet magnitudes for over three million stars in the LAMOST survey, in which 2,202,116 stars are detected by GALEX. For 889,235 undetected stars, we develop a method to estimate their upper limit magnitudes. The distribution of (FUV - NUV) shows that the color declines with increasing effective temperature for stars hotter than 7000 K in our sample, while the trend disappears for the cooler stars due to upper atmosphere emission from the regions higher than their photospheres. For stars with valid stellar parameters, we calculate the UV excesses with synthetic model spectra, and find that the (FUV - NUV) versus can be fitted with a linear relation and late-type dwarfs te..

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University of Melbourne Researchers

Grants

Awarded by National Program on Key Research and Development Project


Awarded by National Natural Science Foundation of China (NSFC)


Awarded by NASA


Awarded by NASA Office of Space Science


Funding Acknowledgements

We are grateful to Krzysztof Findeisen, Beate Stelzer, and Murthy Jayant for valuable discussions. This work was supported by the National Program on Key Research and Development Project (Grant No. 2016YFA0400804), the National Natural Science Foundation of China (NSFC) through grants NSFC-11603038/11333004/11425313/11403056, and the National Astronomical Observatories, Chinese Academy of Sciences (NAOC) under the Young Researcher Grant. Y.W. acknowledges the fund supplied by the Guangdong Provincial Engineering Technology Research Center for Data Science. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts.The Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) is a National Major Scientific Project that was built by the Chinese Academy of Sciences, funded by the National Development and Reform Commission, and operated and managed by the National Astronomical Observatories, Chinese Academy of Sciences.Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III web site is. http://www.sdss3.org/.SDSS-III is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS-III Collaboration including the University of Arizona, the Brazilian Participation Group, Brookhaven National Laboratory, University of Cambridge, Carnegie Mellon University, University of Florida, the French Participation Group, the German Participation Group, Harvard University, the Instituto de Astrofisica de Canarias, the Michigan State/Notre Dame/JINA Participation Group, Johns Hopkins University, Lawrence Berkeley National Laboratory, Max Planck Institute for Astrophysics, Max Planck Institute for Extraterrestrial Physics, New Mexico State University, New York University, The Ohio State University, Pennsylvania State University, University of Portsmouth, Princeton University, the Spanish Participation Group, University of Tokyo, University of Utah, Vanderbilt University, University of Virginia, University of Washington, and Yale University.