J/MNRAS/472/2990 Catalogue of eruptive YSOs and unusual stars (Lucas+, 2017)
Extreme infrared variables from UKIDSS.
II. An end-of-survey catalogue of eruptive YSOs and unusual stars.
Lucas P.W., Smith L.C., Contreras Pena C., Froebrich D., Drew J.E.,
Kumar M.S.N., Borissova J., Minniti D., Kurtev R., Monguio M.
<Mon. Not. R. Astron. Soc., 472, 2990-3020 (2017)>
=2017MNRAS.472.2990L 2017MNRAS.472.2990L (SIMBAD/NED BibCode)
ADC_Keywords: Infrared sources ; YSOs ; Stars, variable ; Photometry, infrared ;
Photometry, millimetric/submm
Keywords: stars: AGB and post-AGB - novae, cataclysmic variables -
stars: protostars - stars: variables: T Tauri, Herbig Ae/Be -
galaxies: active
Abstract:
We present a catalogue of 618 high-amplitude infrared variable stars
(1<ΔK<5mag) detected by the two widely separated epochs of
2.2µm data in the UKIDSS Galactic plane survey, from searches
covering ∼1470deg2. 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 objects (YSOs), based on spatial association with
star-forming regions at distances ranging from 300pc to over 10kpc.
This confirms our initial result in Contreras Pena et al.
(2014MNRAS.439.1829C 2014MNRAS.439.1829C, 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 103L☉ but
only rarely exceed 102.5L☉.
Description:
We have searched the UGPS two-epoch data set for highly variable stars
across some 1470deg2 of the Galactic plane and compiled a catalogue
of 618 sources with amplitudes >1mag in K, nearly all of which are
new discoveries. About 60 per cent of these sources are YSOs,
based on spatial association with SFRs at distance ranging from
∼300pc to 10kpc or more, identified using either the SIMBAD data
base or inspection of the WISE three colour images. YSO luminosities
(determined mainly from WISE data taken in 2010) range from 0.1 to
103L☉, though only rarely exceeding 102.5L☉.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 646 618 Catalogue of 618 high-amplitude IR variable
stars from UGPS
table3.dat 98 18 New pre-MS clusters associated with individual
variable stars
refs.dat 109 187 References
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Running number, in RA order
5- 28 A24 --- UGPS UGPS coordinate-based source designation
30- 74 A45 --- OName Other Name
76- 83 F8.4 deg RAdeg Rigth ascension (J2000)
85- 92 F8.4 deg DEdeg Declination (J2000)
94-101 F8.4 deg GLON Galactic longitude
103-110 F8.4 deg GLAT Galactic latitude
112-118 F7.4 mag Jmag ?=- UKIDSS GPS J magnitude
120-126 F7.5 mag e_Jmag ?=- UKIDSS GPS J magnitude error
128-134 F7.4 mag Hmag ?=- UKIDSS GPS H magnitude
136-142 F7.5 mag e_Hmag ?=- UKIDSS GPS H magnitude error
144-150 F7.4 mag Kcmag ?=- UKIDSS GPS Kc
(K filter, contemporaneous with J and H)
152-158 F7.5 mag e_Kcmag ?=- UKIDSS GPS Kc (K filter,
contemporaneous with J and H) error
160-166 F7.4 mag Komag ?=- UKIDSS GPS Ko
(K filter, measured at a different epoch)
168-174 F7.5 mag e_Komag ?=- UKIDSS GPS Ko (K filter,
measured at a different epoch) error
176 A1 --- EpKc [abc] Kc epoch indicator (a, b or c for 1st,
2nd or 3rd in time order)
177 A1 --- n_EpKc [*] Note on EpKc (1)
178-188 F11.5 d MJDa ?=- Modified Julian dates of epoch a
190-200 F11.5 d MJDb ?=- Modified Julian dates of epoch b
202 I1 --- SatFlagJ [0/1] Saturation warning flag for J (2)
203 I1 --- SatFlagH [0/1] Saturation warning flag for H (2)
204 I1 --- SatFlagKc [0/1] Saturation warning flag for Kc (2)
205 I1 --- SatFlagKo [0/1] Saturation warning flag for Ko (2)
207-208 A2 --- BadFlag [Kc Ko] Bad pixel flag (3)
210-216 F7.5 mag AmpK UKIDSS GPS two epoch amplitude in K
218-224 F7.5 mag AmpKall Amplitude in K (Kmax-Kmin) include 2MASS Ks
data where available
226-246 A21 --- Type Type, likely type of astronomical object
248-251 F4.1 kpc Dist ?=- Distance
253-260 A8 --- r_Dist Reference for Dist
262-473 A212 --- Assoc Information about the source or its location
475-490 A16 --- r_Assoc Reference for association
492-505 A14 --- Group Spatial Group (4)
507-514 F8.5 --- alpha ?=- 2 to 22 micron spectral index,
d(log(λFλ))/d(log(λ))
516-519 A4 --- SEDclass Spectral index-based YSO class
521-527 F7.4 mag rmag ?=- IPHAS or VPHAS+ r mag
529-535 F7.4 mag imag ?=- IPHAS or VPHAS+ i mag
537-541 F5.2 mag Hamag ?=- IPHAS or VPHAS+ Halpha mag
543-547 I5 d MJD ?=- IPHAS or VPHAS+ modified Julian Date
549-554 F6.3 mag J2mag ?=- 2MASS J magnitude
556-561 F6.3 mag H2mag ?=- 2MASS H magnitude
563-568 F6.3 mag Ks2mag ?=- 2MASS Ks magnitude
570-575 F6.3 mag W1mag ?=- WISE W1 magnitude
577-582 F6.3 mag W2mag ?=- WISE W2 magnitude
584-590 F7.3 mag W3mag ?=- WISE W3 magnitude
592-597 F6.3 mag W4mag ?=- WISE W4 magnitude
599-602 F4.2 mag 24mag ?=- MIPS 24um magnitude
604-612 F9.6 mag I1mag ?=- Spitzer/IRAC 3.6um magnitude
614-622 F9.6 mag I2mag ?=- Spitzer/IRAC 4.5um magnitude
624-629 F6.3 mag I3mag ?=- Spitzer/IRAC 5.8um magnitude
631-636 F6.3 mag I4mag ?=- Spitzer/IRAC 8.0um magnitude
638-646 F9.6 mJy F70 ?=- PACS 70 microns flux
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Note (1): Table B1: K fluxes where JHK photometry were taken at a third epoch
-------------------------------------------------------------------
Number Ka Kb Kc MJDobs a MJDobs b MJDobs c
-------------------------------------------------------------------
243 11.98 13.36 12.96 53638.24097 55776.41255 53503.58199
244 15.78 17.22 16.24 53638.24097 55776.41255 53503.58199
572 16.11 14.61 15.42 53915.50097 56208.25244 55463.36109
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Note (2): Saturation warning flag ad follows:
0 = ok
1 = warning
Note (3): indicates if Kc or Ko has a possible bad pixel, though all catalogue
members are bona fide high amplitude variables
Note (4): indicates membership of any group of highly variable YSOs in a
well-studied star forming region
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Cluster [1/18] Cluster sequential number
4- 6 I3 --- Source Source number
8- 14 F7.3 deg RAdeg Right ascension (J2000)
16- 21 F6.3 deg DEdeg Declination (J2000)
23- 25 F3.1 kpc Dist ? Distance
27- 98 A72 --- Com Comment
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Ref Reference code
5- 23 A19 --- BibCode BibCode
25- 63 A39 --- Aut Author's name
65-109 A45 --- Com Comments
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History:
From electronic version of the journal
References:
Contreras Pena et al., Paper I 2014MNRAS.439.1829C 2014MNRAS.439.1829C
(End) Patricia Vannier [CDS] 22-Feb-2023