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

Lucas, P. W. and Smith, L. C. and Contreras Peña, C. and Froebrich, Dirk and Drew, J. E. and Kumar, M. S. N. and Borissova, J. and Minniti, D. and Kurtev, R. and Monguió, M. (2017) Extreme infrared variables from UKIDSS – II. An end-of-survey catalogue of eruptive YSOs and unusual stars. Monthly Notices of the Royal Astronomical Society, 472 (3). pp. 2990-3020. ISSN 0035-8711. (doi:https://doi.org/10.1093/mnras/stx2058) (Full text available)

PDF - Author's Accepted Manuscript
Download (2MB) Preview
[img]
Preview
Official URL
https://doi.org/10.1093/mnras/stx2058

Abstract

We present a catalogue of 618 high amplitude infrared variable stars (1 < DeltaK < 5 mag) detected by the two widely separated epochs of 2.2 um data in the UKIDSS Galactic plane survey, from searches covering 1470 deg^2. Most were discovered by a search of all fields at 30 < l < 230 deg. Sources include new dusty Mira variables, three new CV candidates, a blazar and a peculiar source that may be an interacting binary system. However, c. 60 per cent are 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 Pena et al.(Paper I) that YSOs dominate the high amplitude infrared variable sky in the Galactic disc. It is also supported by recently published VVV results at 295 < l < 350 deg. 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 HII regions. Most of the YSO variability is likely due to variable/episodic accretion on timescales of years, albeit usually less extreme than classical FUors and EXors. Luminosities at the 2010 WISE epoch range from c. 0.1 Lsun to 10^3 Lsun but only rarely exceed 10^2.5 Lsun.

Item Type: Article
Uncontrolled keywords: Astrophysics - Solar and Stellar Astrophysics
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Dirk Froebrich
Date Deposited: 06 Oct 2017 11:32 UTC
Last Modified: 06 Oct 2017 11:32 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/63866 (The current URI for this page, for reference purposes)
  • Depositors only (login required):

Downloads

Downloads per month over past year