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. =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 20deg^2^ 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: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 K_S_ 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) -------------------------------------------------------------------------------- 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. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 ({Delta}i_90_) 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 K_S_ 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) -------------------------------------------------------------------------------- Note (1): * = may suffer from 1-d aliases and thus the variability is not confirmed in this study. -------------------------------------------------------------------------------- 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 = {alpha}^2^ Canum Venaticorum variables; BY = BY Draconis-type variables; CEP = Cepheid variables; DCEP = {delta} Cephei-type variables; DSCT = {delta} Scuti-type variables; EA = Algol-type eclipsing binaries; EB = {beta} Lyrae-type eclipsing binaries; EC = Contact eclipsing binaries; ED = Detached eclipsing binaries; EW = W Ursae Majoris-type eclipsing binaries; ELL = Rotating ellipsoidal variables; GD = {gamma} 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 -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-Aug-2015