University of Hertfordshire

From the same journal

From the same journal

By the same authors

Documents

  • P. W. Lucas
  • L. C. Smith
  • C. Contreras Pena
  • Dirk D. Froebrich
  • Janet E. Drew
  • M. S. N. Kumar
  • J. Borissova
  • D. Minniti
  • R. Kurtev
  • M. Monguio
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Original languageEnglish
Article numberstx2058
Pages (from-to)2990-3020
Number of pages31
JournalMonthly Notices of the Royal Astronomical Society
Volume472
Issue3
Early online date22 Aug 2017
DOIs
Publication statusPublished - 11 Dec 2017

Abstract

We present a catalogue of 618 high-amplitude infrared variable stars (1 < ΔK < 5 mag) detected by the two widely separated epochs of 2.2 μm data in the UKIDSS Galactic plane survey, from searches covering ∼1470 deg2. Most were discovered by a search of all fields at 30 < l < 230°. Sources include new dusty Mira variables, three new cataclysmic variable candidates, a blazar and a peculiar source that may be an interacting binary system. However, ∼60 per cent are young stellar obbjects (YSOs), based on spatial association with star-forming regions at distances ranging from 300 pc to over 10 kpc. This confirms our initial result in Contreras Peña et al. (Paper I) that YSOs dominate the high-amplitude infrared variable sky in the Galactic disc. It is also supported by recently published VISTA Variables in the Via Lactea (VVV) results at 295 < l < 350°. The spectral energy distributions of the YSOs indicate class I or flat-spectrum systems in most cases, as in the VVV sample. A large number of variable YSOs are associated with the Cygnus X complex and other groups are associated with the North America/Pelican nebula, the Gemini OB1 molecular cloud, the Rosette complex, the Cone nebula, the W51 star-forming region and the S86 and S236 H II regions. Most of the YSO variability is likely due to variable/episodic accretion on time-scales of years, albeit usually less extreme than classical FUors and EXors. Luminosities at the 2010 Wide-field Infrared Survey Explorer epoch range from ∼0.1 to 103 L⊙ but only rarely exceed 102.5 L⊙.

Notes

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. The data table for the 618 variable stars (Table 1) is available at http://star.herts.ac.uk/~pwl/Lucas/papers/ in FITS and ascii format

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