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J/MNRAS/465/3011   VVV high amplitude NIR variable stars (Contreras Pena+, 2017)

A population of eruptive variable protostars in VVV. Contreras Pena C., Lucas P.W., Minniti D., Kurtev R., Stimson W., Navarro Molina C., Borissova J., Kumar M.S.N., Thompson M.A., Gledhill T., Terzi R., Froebrich D., Caratti O Garatti A. <Mon. Not. R. Astron. Soc., 465, 3011-3038 (2017)> =2017MNRAS.465.3011C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence ; Protostars ; Infrared sources ; Stars, giant ; Photometry Keywords: stars: AGB and post-AGB - stars: low-mass - stars: pre-main-sequence - stars: protostars - stars: variables: T Tauri - Herbig Ae/Be - infrared: stars Abstract: We present the discovery of 816 high-amplitude infrared variable stars (ΔKs>1mag) in 119deg2 of the Galactic mid-plane covered by the VISTA Variables in the Via Lactea (VVV) survey. Almost all are new discoveries and about 50 per cent are young stellar objects (YSOs). This provides further evidence that YSOs are the commonest high-amplitude infrared variable stars in the Galactic plane. In the 2010-2014 time series of likely YSOs, we find that the amplitude of variability increases towards younger evolutionary classes (class I and flat-spectrum sources) except on short time-scales (<25d) where this trend is reversed. Dividing the likely YSOs by light-curve morphology, we find 106 with eruptive light curves, 45 dippers, 39 faders, 24 eclipsing binaries, 65 long-term periodic variables (P>100d) and 162 short-term variables. Eruptive YSOs and faders tend to have the highest amplitudes and eruptive systems have the reddest spectral energy distribution (SEDs). Follow-up spectroscopy in a companion paper verifies high accretion rates in the eruptive systems. Variable extinction is disfavoured by the two epochs of colour data. These discoveries increase the number of eruptive variable YSOs by a factor of at least 5, most being at earlier stages of evolution than the known FUor and EXor types. We find that eruptive variability is at least an order of magnitude more common in class I YSOs than class II YSOs. Typical outburst durations are 1-4yr, between those of EXors and FUors. They occur in 3-6 per cent of class I YSOs over a 4yr time span. Description: We present the single epoch ZYJHKs photometry obtained from VVV catalogues for 816 high-amplitude variables. We also present the amplitude of the Ks light curve of the objects derived from 2010-2015 photometry. For each object we also provide a provisional classification derived from the shape of the light curve. For objects found to be likely associated with SFRs we present an spectral index derived from the object's spectral energy distribution. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 166 816 Photometric parameters for 816 high amplitude near-infrared variables from VVV table1.dat 33 39562 Photometry of 816 high-amplitude variable stars
See also: II/337 : VISTA Variables in the Via Lactea Survey DR1 (Saito+, 2012) II/348 : VISTA Variables in the Via Lactea Survey DR2 (Minniti+, 2017) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Name Object identifier (VVVvNNN) 9- 32 A24 --- VVV VVV survey designation (VVV JHHMMSS.ss+DDMMSS.ss) 34- 35 I2 h RAh Right Ascension (J2000) 37- 38 I2 min RAm Right Ascension (J2000) 40- 44 F5.2 s RAs Right Ascension (J2000) 46 A1 --- DE- Declination sign (J2000) 47- 48 I2 deg DEd Declination (J2000) 50- 51 I2 arcmin DEm Declination (J2000) 53- 57 F5.2 arcsec DEs Declination (J2000) 59- 67 F9.5 deg GLON Galactic longitude 69- 76 F8.5 deg GLAT Galactic latitude 78- 82 F5.2 mag Zmag ?=-9.99 The Z band magnitude 84- 88 F5.2 mag e_Zmag ?=-9.99 Error in Zmag 90- 94 F5.2 mag Ymag ?=-9.99 The Y band magnitude 96-100 F5.2 mag e_Ymag ?=-9.99 Error in Ymag 102-106 F5.2 mag Jmag ?=-9.99 The J band magnitude 108-112 F5.2 mag e_Jmag ?=-9.99 Error in Jmag 114-118 F5.2 mag Hmag ?=-9.99 The H band magnitude 120-124 F5.2 mag e_Hmag ?=-9.99 Error in Hmag 126-130 F5.2 mag Ksmag The Ks band magnitude 132-136 F5.2 mag e_Ksmag Error in Ksmag 138-141 F4.2 mag DeltaKs Ks amplitude of the 2010-2015 light curve 143-147 F5.2 --- alphaClass ?=-9.99 The 2-23um spectral index parameter that relates to the evolutionary class of sources that appear to be associated with SFRs 149 A1 --- SFR [y/n] Whether the object is likely associated with SFRs or not 151-158 A8 --- Class The classification of the object from its light curve 160-166 F7.2 d Period ?=-999.99 The approximate period for variable stars where we are able to measure this parameter
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Name Object identifier (VVVvNNN) 9- 20 F12.7 d Epoch Epoch of observation, MJD-55200 21- 27 F7.3 mag Kmag The Ks magnitude 28- 33 F6.3 mag e_Kmag Error in Kmag
Acknowledgements: Carlos Contreras Pena, c.contreras(at)exeter.ac.uk
(End) Patricia Vannier [CDS] 21-Aug-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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