UV radiation from stars -- SED templates

1. UV radiation from stars -- SED templates Yuxiang Qin Supervisor: Jifeng Liu @ XiaMen University 2nd Aug. 2014

2. Contents • Background • Data origin • Data selection • Sample analysis • SED Templates • FUV data • Conclusion & Future work

3. Background

4. Background • IUE • UVBLUE

5. Data origin • SDSS DR10 (~1 million) SpecObjAll, PhotoObjAll, SSPP, SegueTargetAll, ProperMotions, ApogeeVisit… • LAMOST DR1&DR2 (~3 million) Main catalogs • GALEX GR6 plus 7 (~300 million) • Photoobjall, visitphotoobjall …

6. Data selection • influence from the luminous neighbors • explicit spectral type • Sufficient signal-noise ratio (S/N) • Outliers

7. Sample analysis

8. Sample analysis

9. Sample analysis

10. SED Templates

11. FUV data

12. Conclusion & Future work • Catalog, spectra, photometry in seven bands • UV radiation from the late-type stars, chromospherical activity, NUV 100 times, FUV 100 million times (probably higher) • More data • FUV Detection Threshold -> better SED templates -> Sun? • Searching for black holes • UV upturn • X-ray ?

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15. END Thanks for your listening!