2015AJ....149...50O

Query : 2015AJ....149...50O

2015AJ....149...50O - Astron. J., 149, 50 (2015/February-0)

Difference image analysis of defocused observations with CSTAR.

OELKERS R.J., MACRI L.M., WANG L., ASHLEY M.C.B., CUI X., FENG L.-L., GONG X., LAWRENCE J.S., QIANG L., LUONG-VAN D., PENNYPACKER C.R., YANG H., YUAN X., YORK D.G., ZHOU X. and ZHU Z.

Abstract (from CDS):

The Chinese Small Telescope ARray carried out high-cadence time-series observations of 27 square degrees centered on the South Celestial Pole during the Antarctic winter seasons of 2008-2010. Aperture photometry of the 2008 and 2010 i-band images resulted in the discovery of over 200 variable stars. Yearly servicing left the array defocused for the 2009 winter season, during which the system also suffered from intermittent frosting and power failures. Despite these technical issues, nearly 800,000 useful images were obtained using g, r, and clear filters. We developed a combination of difference imaging and aperture photometry to compensate for the highly crowded, blended, and defocused frames. We present details of this approach, which may be useful for the analysis of time-series data from other small-aperture telescopes regardless of their image quality. Using this approach, we were able to recover 68 previously known variables and detected variability in 37 additional objects. We also have determined the observing statistics for Dome A during the 2009 winter season; we find the extinction due to clouds to be less than 0.1 and 0.4 mag for 40% and 63% of the dark time, respectively.

Abstract Copyright: ∼

Journal keyword(s): methods: data analysis - stars: variables: general

VizieR on-line data: <Available at CDS (J/AJ/149/50): table4.dat>

Simbad objects: 106

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Number of rows : 106
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 224697 V* 00 00 50.8881898488 -88 19 41.929306248   9.75 9.39     A4III 7 0
2 TYC 9498-800-1 EB* 00 01 17.1713824776 -87 44 02.807947140   13.51 12.06 12.31   ~ 4 0
3 [WMK2011] CSTAR 119488 Ir* 00 08 43.7421207336 -88 13 47.941789188           ~ 3 0
4 GSC2.3 S0SI000391 V* 00 15 15.1702658400 -88 23 35.112458472           ~ 1 0
5 TYC 9502-41-1 V* 00 20 19.4058982416 -89 48 37.985209020   12.56 10.75     ~ 2 0
6 GSC2.3 S0SI000292 V* 00 23 46.2551387088 -88 08 02.568025284           ~ 1 0
7 TYC 9502-198-1 V* 00 31 15.9027392112 -88 55 18.009689376   11.72 11.24     ~ 4 0
8 GSC2.3 S0SJ000041 V* 00 37 50.2156964328 -88 37 30.859394988           ~ 1 0
9 TYC 9502-380-1 V* 00 47 27.1015116648 -88 23 31.017524424   12.66 12.22     ~ 1 0
10 2MASS J00524246-8917319 EB* 00 52 42.5009493744 -89 17 32.128406196           ~ 6 0
11 [WMK2011] CSTAR 87501 dS* 01 23 02.4020319960 -89 17 09.080027124           ~ 4 0
12 TYC 9502-373-1 SB* 01 51 34.3753430976 -88 33 27.101059632   13.23 12.03     ~ 3 0
13 GSC2.3 S0SI000373 V* 01 53 26.7172772256 -88 20 58.179886692           ~ 1 0
14 UCAC2 8595 V* 01 55 46.5868246584 -88 14 41.434066644   15.20 14.49 14.50   ~ 1 0
15 TYC 9503-171-1 V* 02 12 56.0386216272 -88 13 52.433014260   12.97 11.09     ~ 3 0
16 TYC 9503-78-1 V* 02 41 54.0872474808 -88 26 02.843030400   11.92 11.19     ~ 3 0
17 GSC2.3 S0SI000269 LP? 02 42 27.8541656856 -88 04 22.145316060           ~ 4 0
18 V* SU Oct Mi* 03 00 34.7388265608 -88 03 00.104970240   13.98 12.39 12.16   ~ 6 0
19 HD 29474 SB* 03 29 39.5727763296 -88 14 47.728609980   8.95 8.28     K0/2III+F 17 0
20 ASASSN-V J042021.53-882511.6 dS* 04 20 12.9388049688 -88 25 03.148325508           ~ 5 0
21 V* CR Oct LP* 04 49 02.5606776024 -88 16 16.151648592   8.94 7.21     M2III 22 0
22 TYC 9504-81-1 V* 05 15 49.7153223552 -88 17 51.554700312   13.03 11.44     ~ 3 0
23 CD-87 32 gD* 05 47 07.9532709288 -87 51 00.127339776   10.64 10.22     F0 6 0
24 GSC2.3 S0SG000328 V* 05 52 17.1575698272 -89 00 35.860492188           ~ 3 0
25 2MASS J06284195-8802416 EB* 06 28 41.7669611568 -88 02 41.571841236           ~ 4 0
26 ASAS J064047-8815.4 EB* 06 40 47.0274435888 -88 15 21.159299700   12.63 12.26     ~ 11 0
27 PPM 788670 Ir* 06 49 52.2870167040 -89 21 58.344852060     10.6     ~ 3 0
28 GSC2.3 S3YA000502 V* 07 01 37.4272494984 -88 17 02.591503404           ~ 2 0
29 HD 75261 V* 07 23 35.3403047688 -88 51 06.911819064   8.54 8.49     B9V 13 0
30 SV* BV 1040 EB* 07 43 52.8412551792 -89 07 36.954451884   12.4   12.90   ~ 8 0
31 TYC 9505-167-1 Ir* 07 54 37.9756555056 -89 15 40.938245604   12.57 11.22     ~ 3 0
32 GSC2.3 S3Y8000195 V* 08 12 33.1912929648 -89 02 14.882951688           ~ 1 0
33 GSC2.3 S3YB000128 V* 08 39 18.0149053608 -88 13 55.938245088           ~ 1 0
34 UCAC2 17303 EB* 08 39 41.0262316752 -87 39 01.785433932   13.52 12.73 12.53   ~ 3 0
35 2MASS J08402733-8847003 EB* 08 40 27.2510140536 -88 47 00.140382564           ~ 5 0
36 ASAS J084613-8833.7 EB* 08 46 10.9986964176 -88 33 42.777503532           K4 33 0
37 GSC2.3 S3YB000199 V* 08 53 44.4265304328 -88 26 32.900667000           ~ 2 0
38 GSC2.3 S3YB000143 V* 08 57 30.1661795208 -88 18 29.595676068           ~ 1 0
39 TYC 9518-443-1 EB* 09 03 59.1362955984 -88 33 07.526462868   12.19 11.72     ~ 8 0
40 TYC 9514-461-1 V* 09 24 51.2211399936 -88 00 09.683871624   12.98 12.09     ~ 1 0
41 [WMK2011] CSTAR 32007 RR* 09 29 39.1948409568 -88 30 06.306598980           ~ 4 0
42 GSC2.3 S3Y8000251 V* 09 35 49.9161531384 -89 19 28.583259744           ~ 1 0
43 CPD-88 97 SB* 10 01 18.8001936192 -88 44 36.786080616   11.50 10.52     ~ 4 0
44 TYC 9519-37-1 El* 10 01 21.5469241632 -88 13 30.911702880   12.30 12.58     ~ 4 0
45 HD 92277 ** 10 04 40.2921993300 -88 40 25.542122003   9.49 9.10     F0IV/V 16 0
46 TYC 9515-907-1 V* 10 25 53.9972377752 -87 53 40.934278608   13.74 11.69     ~ 3 0
47 HD 98795 V* 11 08 19.7986900128 -88 21 00.964931364   9.61 8.44     K1/2III/IV 13 0
48 [WMK2011] CSTAR 26640 LP? 11 17 00.4998289176 -88 35 36.390534576   13.05 11.74     ~ 5 0
49 HD 100053 V* 11 20 31.8784101000 -88 14 59.947724040   10.15 8.56     M3/4III 6 0
50 CPD-87 187 V* 11 52 50.8933931880 -88 23 28.947701184   12.35 10.37     ~ 2 0
51 TYC 9520-448-1 V* 12 12 56.3770768248 -88 34 11.569859976   12.12 11.27     ~ 4 0
52 TYC 9516-461-1 EB* 12 21 36.2392602888 -88 00 14.447928204   12.34 12.12     ~ 6 0
53 [WMK2011] CSTAR 39541 V* 12 36 22.7732665488 -89 04 03.204867432           ~ 3 0
54 GSC2.3 S742000480 V* 12 46 24.4747324224 -88 14 42.124820244           ~ 1 0
55 HD 111644 EB* 13 01 58.3365245160 -87 39 56.283251184   9.89 9.30 9.66   F8V 10 1
56 GSC2.3 S742000553 V* 13 12 14.8078177896 -88 20 34.619727984           ~ 1 0
57 2MASS J13234810-8816047 EB* 13 23 48.2210175768 -88 16 04.803088692           ~ 5 0
58 TYC 9516-215-1 V* 13 28 28.7878911984 -87 53 09.299173308   13.03 11.46     ~ 2 0
59 GSC2.3 S742026828 V* 13 34 47.76 -88 21 15.8           ~ 1 0
60 TYC 9520-360-1 V* 13 50 03.6736424112 -88 46 13.144430964   11.78 11.07     ~ 4 0
61 2MASS J13531738-8854152 EB* 13 53 17.2776428448 -88 54 15.229040076           ~ 5 0
62 GSC2.3 S742000399 V* 14 11 07.9244357856 -88 03 32.806043136           ~ 1 0
63 GSC2.3 S743000364 V* 14 14 10.5828964584 -88 45 41.265953820           ~ 1 0
64 V* Y Oct RR* 14 29 04.4639089632 -88 38 43.685447136   12.98 12.04 12.43   ~ 31 1
65 V* BQ Oct S* 14 35 29.6632443792 -89 46 18.176026080   8.524 6.848     S5,1 45 0
66 HD 123912 V* 14 50 46.8437693736 -88 19 40.425290256   11.02 9.53     K2 6 0
67 HD 124927 EB* 14 59 51.9518522208 -88 22 35.920148628   10.12 8.82     K2(III) 6 0
68 GSC2.3 S743000136 V* 15 01 17.5088946360 -88 13 44.467085640           ~ 1 0
69 GSC2.3 S741000043 V* 15 32 36.4114826544 -88 07 43.419040140           ~ 1 0
70 [WMK2011] CSTAR 36526 LP? 15 35 00.5839177800 -88 16 12.772118928   16.174   14.307   ~ 5 0
71 HD 133348 SB* 15 44 44.2026136200 -87 46 35.419651608   9.60 8.79     G6V 23 0
72 UCAC2 12446 EB* 15 59 17.4072030936 -88 00 42.977465712   15.71 14.86 14.71   ~ 3 0
73 GSC2.3 S740000411 V* 16 02 15.8977820088 -89 19 14.698648236           ~ 1 0
74 TYC 9534-22-1 V* 17 05 15.8233683768 -89 51 43.910172540   12.77 11.49     ~ 3 0
75 GSC2.3 S743000500 V* 17 08 55.2909335496 -88 44 32.782855596           ~ 1 0
76 TYC 9534-390-1 V* 17 15 45.5738634936 -89 00 42.804315000   10.99 10.77     ~ 3 0
77 TYC 9534-335-1 dS* 17 36 45.8370165120 -88 14 10.643041860   11.61 11.20     ~ 3 0
78 [WMK2011] CSTAR 64944 V* 17 51 13.5505892592 -88 09 49.005256824           ~ 3 0
79 GSC2.3 S741000378 LP? 17 59 01.2457884576 -88 01 33.188620620           ~ 4 0
80 TYC 9535-134-1 V* 18 08 15.0003544032 -88 18 02.830542876   11.75 11.10     ~ 3 0
81 TYC 9535-283-1 V* 18 22 33.3821511816 -89 36 22.943941200   12.50 12.41     ~ 3 0
82 V* RW Oct RR* 18 29 04.7062207224 -88 32 32.143031412           ~ 8 0
83 CPD-88 148 EB* 18 30 58.0343986752 -88 43 17.477248620   10.60 10.12     F5 8 0
84 GSC2.3 SA9U000442 V* 18 35 32.31 -88 33 47.9           ~ 1 0
85 GSC2.3 SA9V000058 V* 18 41 53.0298750456 -88 46 11.507596680           ~ 1 0
86 2MASS J18583595-8812554 SB* 18 58 36.1794062712 -88 12 55.366142256           ~ 4 0
87 CPD-87 275 Ir* 19 02 33.9883393728 -87 35 30.283961748   10.91 9.64     K0 5 0
88 TYC 9535-147-1 El* 19 17 52.7371505712 -88 51 11.100564648   13.01 12.39     ~ 5 0
89 GSC2.3 SA9U000336 LP? 19 27 57.9966331656 -88 13 26.206814532           ~ 4 0
90 HD 156092 V* 19 48 56.9566693248 -89 07 14.304638712   11.05 10.92     A 8 0
91 2MASS J19502673-8744506 EB* 19 50 26.6453069376 -87 44 50.685305676           ~ 4 0
92 GSC2.3 SA9S000107 V* 19 55 17.2617136656 -89 18 10.381628052           ~ 1 0
93 TYC 9532-729-1 EB* 20 28 29.6796094680 -87 46 16.479143364   12.91 12.27     ~ 6 0
94 GSC2.3 SA9U000449 V* 20 35 13.4183877264 -88 07 56.260205976           ~ 1 0
95 GSC2.3 SA9U000450 V* 20 41 01.5289341888 -88 08 14.524513656           ~ 1 0
96 2MASS J20573329-8903503 EB* 20 57 33.1917408192 -89 03 50.317563024           ~ 4 0
97 GSC2.3 SA9V000172 V* 21 10 19.6898424192 -88 27 33.798408840           ~ 1 0
98 TYC 9536-174-1 V* 21 14 23.9402150040 -88 56 01.935823128   12.49 11.82     ~ 1 0
99 V* RS Oct RR* 21 47 16.9032860328 -87 39 06.418931724     12.34     ~ 31 0
100 [WMK2011] CSTAR 93873 LP? 22 17 45.7742207088 -89 01 38.006500080           ~ 5 0
101 HD 199624 gD* 22 23 40.7552325168 -88 53 42.967592088   10.19 9.71     A5 8 0
102 * B Oct dS* 22 45 30.2217747720 -88 49 05.861410716   6.85 6.57     F0IV/V 46 0
103 [WMK2011] CSTAR 121369 V* 23 15 36.0803702184 -88 07 33.639153888           ~ 3 0
104 GSC2.3 SA9T000182 V* 23 16 46.4648849040 -87 54 16.272860184           ~ 2 0
105 SV* HV 8921 RR* 23 35 15.3076508160 -89 27 51.560687412   14.4       ~ 8 0
106 NAME SCP reg ~ ~           ~ 113 0

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