J/ApJS/218/20 Photometric variability search in the CSTAR field (Wang+, 2015)
Photometric variability in the CSTAR field: results from the 2008 data set.
Wang S., Zhang H., Zhou X., Zhou J.-L., Fu J.-N., Yang M., Liu H., Xie J.,
Wang L., Wang L., Wittenmyer R.A., Ashley M.C.B., Feng L.-L., Gong X.,
Lawrence J.S., Liu Q., Luong-Van D.M., Ma J., Peng X., Storey J.W.V.,
Wu Z., Yan J., Yang H., Yang J., Yuan X., Zhang T., Zhang X., Zhu Z.,
Zou H.
<Astrophys. J. Suppl. Ser., 218, 20 (2015)>
=2015ApJS..218...20W 2015ApJS..218...20W
ADC_Keywords: Stars, variable ; Photometry, infrared ;
Cross identifications ; X-ray sources
Keywords: binaries: eclipsing; catalogs; methods: data analysis;
stars: variables: general; surveys; techniques: photometric
Abstract:
The Chinese Small Telescope Array (CSTAR) is the first telescope
facility built at Dome A, Antarctica. During the 2008 observing
season, the installation provided long-baseline and high-cadence
photometric observations in the i-band for 18145 targets within
20deg2 CSTAR field around the South Celestial Pole for the purpose
of monitoring the astronomical observing quality of Dome A and
detecting various types of photometric variability. Using sensitive
and robust detection methods, we discover 274 potential variables from
this data set, 83 of which are new discoveries. We characterize most
of them, providing the periods, amplitudes, and classes of
variability.
Description:
Chinese Small Telescope Array (CSTAR), controlled from the PLATO
autonomous observatory, consists of four fixed co-aligned 14.5cm
(effective aperture of 10cm) telescopes, each with a different optical
filter in SDSS bands: r, g, i, and open.
CSTAR, the first photometric telescope to enter operation at Dome A,
was successfully deployed in 2008 January and operated for the
subsequent four winters until it was retrieved in 2012 to be
repurposed. The data set analyzed in this work was collected from 2008
March 4 to August 8. In this observing season, about 1728hr
observations provided some 0.3million i-band frames for 18145 stars
with exposure times of 20s or 30s. A detailed description of the CSTAR
observations in 2008 is given in Zhou et al. (2010, J/PASP/122/347).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 140 191 Catalog of recovered variables from the previous
study in the CSTAR field
table2.dat 139 83 Catalog of newly discovered variables in the
CSTAR field
table3.dat 119 33 Missed variables during our variability search
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
I/317 : The PPMXL Catalog (Roeser+ 2010)
J/AJ/146/139 : 2010 photometry of variable stars from Dome A (Wang+, 2013)
J/AJ/142/155 : Variable stars photometry from Dome A (Wang+, 2011)
J/AJ/141/166 : HATNet variability survey of K and M dwarfs (Hartman+, 2011)
J/PASP/122/347 : Chinese Small Telescope ARray (CSTAR) (Zhou+, 2010)
J/MNRAS/385/1749 : UNSW catalog of Variable Stars (Christiansen+, 2008)
J/MNRAS/381/851 : SuperWASP-North exoplanet candidates (Clarkson+, 2007)
J/MNRAS/379/816 : SuperWASP-North extrasolar planet candidates (Street+, 2007)
J/A+A/467/785 : SuperWASP/ROSAT periodic variable stars (Norton+, 2007)
http://explore.china-vo.org/ : Chinese astronomical data center home page
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- CSTAR The CSTAR identifier (JHHMMSS.ss+DDMMSS.s) (G1)
21- 36 A16 --- 2MASS 2MASS identifier (HHMMSSss+DDMMSSs; J2000)
38- 43 F6.3 mag imag [6.3/14.8] Median i band magnitude
45- 51 F7.4 d Per [0.02/88.4]? Period of variability (G2)
53 A1 --- f_Per [*] Improved period (1)
55- 59 F5.3 mag Amp [0.003/0.96] Variability amplitude
61- 67 F7.4 d T0 ? Julian Date of brightness minimum; JD-2454500
69- 74 F6.3 mag Jmag [2.6/14.1] 2MASS J band magnitude
76- 81 F6.3 mag Hmag [1.7/13.9] 2MASS H band magnitude
83- 88 F6.3 mag Ksmag [1.4/13.7] 2MASS KS band magnitude
90- 96 F7.2 mas/yr pmRA [-115/85] Proper motion along Right Ascension;
from PPMXL (Cat. I/317)
98-103 F6.1 mas/yr pmDE [-121/254] Proper motion along Declination;
from PPMXL (Cat. I/317)
105-108 I4 K Teff [2085/9396]? CDS/VizieR Effective temperature
110-117 A8 --- SpT VizieR MK spectral type
119-134 A16 --- 1RXS ROSAT identifier (JHHMMSS.s+DDMMSS)
136-139 A4 --- Type Type of variability (G3)
140 A1 --- f_Type Improved variability type (2)
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Note (1):
* = one of 7 known variables with an improved period.
Note (2):
* = Improved classifications are given for 120 known variables in the
CSTAR field based on their stellar information (color, proper motion,
effective temperature, luminosity class, spectral type, and X-ray
activity), as well as the noteworthy features (shape, period, and
amplitude) of their light curves; Such cases are marked with asterisks.
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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- 19 A19 --- CSTAR The CSTAR identifier (JHHMMSS.ss+DDMMSS.s) (G1)
21 A1 --- f_CSTAR [*] Non-confirmed variability (1)
23- 38 A16 --- 2MASS 2MASS identifier (HHMMSSss+DDMMSSs; J2000)
40- 44 F5.2 mag imag [8.3/14.8] Median i band magnitude
46- 52 F7.4 d Per [0.1/43.7]? Period of variability (G2)
54- 57 F4.2 mag di90 [0.03/1.3]? The 90% confidence interval
of light curve (Δi90)
59- 66 F8.4 d T0 ? Julian Date of brightness minimum; JD-2454500
68- 73 F6.3 mag Jmag [5.5/13.4] 2MASS J band magnitude
75- 80 F6.3 mag Hmag [3.9/13.1] 2MASS H band magnitude
82- 87 F6.3 mag Ksmag [2.8/13.1] 2MASS KS band magnitude
89- 94 F6.2 mas/yr pmRA [-52/29.6] Proper motion along Right Ascension;
from PPMXL (Cat. I/317)
96-101 F6.2 mas/yr pmDE [-87/38.2] Proper motion along Declination;
from PPMXL (Cat. I/317)
103-106 I4 K Teff [4188/8174]? CDS/VizieR Effective temperature
108-114 A7 --- SpT VizieR MK spectral type
116-119 A4 --- Type Type of variability (G3)
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Note (1):
* = may suffer from 1-d aliases and thus the variability is not
confirmed in this study.
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Globale notes:
Note (G1): Objects are listed in order of increasing right ascension.
Note (G2): Only for periodic variables.
Note (G3): The variable types are:
ACV = α2 Canum Venaticorum variables;
BY = BY Draconis-type variables;
CEP = Cepheid variables;
DCEP = δ Cephei-type variables;
DSCT = δ Scuti-type variables;
EA = Algol-type eclipsing binaries;
EB = β Lyrae-type eclipsing binaries;
EC = Contact eclipsing binaries;
ED = Detached eclipsing binaries;
EW = W Ursae Majoris-type eclipsing binaries;
ELL = Rotating ellipsoidal variables;
GD = γ Doradus variables;
IR = Irregular variables;
MP = Multi-periodic variables;
RL = RR Lyrae-type variables;
SP = Spotted variables that are not classified into a particular class;
TR = Transit-like events
U = Unclassified variables
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-Aug-2015