Extreme infrared variables from UKIDSS – II. An end-of-survey catalogue of eruptive YSOs and unusual stars

摘要: We present a catalogue of 618 high amplitude infrared variable stars (1 < DeltaK 5 mag) detected by the two widely separated epochs 2.2 um data in UKIDSS Galactic plane survey, from searches covering 1470 deg^2. Most were discovered search all fields at 30 l 230 deg. Sources include new dusty Mira variables, three CV candidates, blazar and peculiar source that may be an interacting binary system. However, c. 60 per cent are YSOs, based on spatial association with star forming regions distances ranging 300 pc to over 10 kpc. This confirms our initial result Contreras Pena et al.(Paper I) YSOs dominate sky disc. It is also supported recently published VVV results 295 350 The spectral energy distributions indicate class I or flat spectrum systems most cases, as sample. A large number associated Cygnus X complex other groups North America/Pelican nebula, Gemini OB1 molecular cloud, Rosette complex, Cone W51 region S86 S236 HII regions. YSO variability likely due variable/episodic accretion timescales years, albeit usually less extreme than classical FUors EXors. Luminosities 2010 WISE epoch range 0.1 Lsun 10^3 but only rarely exceed 10^2.5 Lsun.