SIMBAD references

2014MNRAS.439.1829C - Mon. Not. R. Astron. Soc., 439, 1829-1854 (2014/April-1)

Extreme infrared variables from UKIDSS - I. A concentration in star-forming regions.

CONTRERAS PENA C., LUCAS P.W., FROEBRICH D., KUMAR M.S.N., GOLDSTEIN J., DREW J.E., ADAMSON A., DAVIS C.J., BARENTSEN G. and WRIGHT N.J.

Abstract (from CDS):

We present initial results of the first panoramic search for high-amplitude near-infrared variability in the Galactic plane. We analyse the widely separated two-epoch K-band photometry in the fifth and seventh data releases of the UKIDSS Galactic plane survey. We find 45 stars with ΔK > 1 mag, including two previously known OH/IR stars and a Nova. Even though the mid-plane is not yet included in the data set, we find the majority (66 per cent) of our sample to be within known star-forming regions (SFRs), with two large concentrations in the Serpens OB2 association (11 stars) and the Cygnus-X complex (12 stars). Sources in SFRs show spectral energy distributions that support classification as young stellar objects (YSOs). This indicates that YSOs dominate the Galactic population of high-amplitude infrared variable stars at low luminosities and therefore likely dominate the total high-amplitude population. Spectroscopic follow up of the DR5 sample shows at least four stars with clear characteristics of eruptive pre-main-sequence variables, two of which are deeply embedded. Our results support the recent concept of eruptive variability comprising a continuum of outburst events with different time-scales and luminosities, but triggered by a similar physical mechanism involving unsteady accretion. Also, we find what appears to be one of the most variable classical Be stars.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): stars: AGB and post-AGB - stars: low-mass - stars: pre-main-sequence - stars: protostars - stars: variables: T Tauri, Herbig Ae/Be - infrared: stars

Nomenclature: Table 1: [CLF2014] GPSVNN (Nos GPSV1-GPSV45).

Simbad objects: 67

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2021.09.19-09:28:07

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