2012AJ....144..149C

Query : 2012AJ....144..149C

2012AJ....144..149C - Astron. J., 144, 149 (2012/November-0)

A holistic view of the W UMa type TY Boo.

CHRISTOPOULOU P.-E., PAPAGEORGIOU A., VASILEIADIS T. and TSANTILAS S.

Abstract (from CDS):

New CCD four-color light curves of TY Boo made on eight nights over 2010-2011 were analyzed in comparison with historical light curves obtained from 1969 through 2011. The light curves could all be represented by a unique geometry and by wavelength consistent phototometric parameters of a two-spot model on either stellar component. It is confirmed that TY Boo is a shallow W-type contact binary system with a degree of contact factor of f = 7.6% (±0.8). A period investigation based on all available data shows a long-term decrease (dP/dt = -3.65x10–8 days/yr) and an oscillation (P3= 58.9 yr, A = 0.0254 days). Without ruling out the presence of a tertiary companion, the weight of evidence points to an active cyclic magnetic activity that causes spot formation rather than an unseen companion. Mass transfer between the components and angular momentum loss are also considered as possible mechanisms.

Abstract Copyright: ∼

Journal keyword(s): binaries: close - binaries: eclipsing - stars: individual: TY Boo

VizieR on-line data: <Available at CDS (J/AJ/144/149): table2.dat table4.dat refs.dat>

CDS comments: Table 9: CCom is a misprint for CC Com and LC Del is a misprint for LS Del.

Simbad objects: 39

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Number of rows : 39
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 V* V523 Cas SB* 00 40 06.2679105096 +50 14 15.518292216   11.698 10.62 9.969 9.388 K4V 174 0
2 V* GW Cep EB* 01 45 58.6227384192 +80 04 55.327969128   11.72 11.21 11.025 10.656 G3 69 0
3 HD 17613B SB* 02 49 52.2905822256 +08 56 17.240792568   10.12 8.821 9.44 8.138 F8V 47 0
4 V* UX Eri SB* 03 09 52.7437496400 -06 53 33.511004988   11.61 10.97 10.128 9.8 F9V 109 0
5 V* AH Tau EB* 03 47 11.9661390480 +25 06 59.375707992   11.59 11.07 11.09 10.436 G1p 83 0
6 V* AO Cam SB* 04 28 13.6471014456 +53 02 44.463885216   11.23 10.51 9.071 8.674 G0V 105 0
7 V* RZ Tau SB* 04 36 37.6613713272 +18 45 17.792668224   10.79 10.19 9.706 9.318 F5 157 0
8 V* V402 Aur SB* 05 02 14.7412938168 +31 15 49.292827020 9.480 9.350 8.910     F0 67 0
9 V* V396 Mon EB* 06 38 36.4832406072 +03 36 17.152913808   13.175 12.60 12.231 11.871 ~ 62 0
10 V* AD Cnc EB* 08 46 20.1002153904 +10 20 07.362523896   13.80 13.06     K0V 98 0
11 Cl* NGC 2682 SAND 1282 SB* 08 51 37.8473566296 +11 50 57.092451072 13.964 13.89 13.333   12.634 F7V 181 0
12 V* AA UMa SB* 09 46 59.2849171056 +45 45 56.388568680   11.527 11.71 10.516 10.185 G0 89 0
13 V* AM Leo SB* 11 02 10.8846331272 +09 53 42.657520560   9.86 9.33 8.895 8.417 F5V 200 0
14 V* AP Leo SB* 11 05 05.0213426040 +05 09 06.404796468   10.07 9.57 8.971 8.849 F8V 130 0
15 V* AG Vir SB* 12 01 03.5040338736 +13 00 30.005824428   8.78 8.52     A5V 173 0
16 V* CC Com SB* 12 12 06.0378799056 +22 31 58.682832024   13.09 11.42 10.543 10.085 K4/5V 228 0
17 V* DD Com EB* 12 28 46.2477452160 +21 43 33.351821472     14.60     G5-G6: 50 0
18 V* RW Com SB* 12 33 00.2840199504 +26 42 58.361790816   12.33 11.682 10.929 9.977 G8e 169 0
19 V* RZ Com SB* 12 35 05.0595351864 +23 20 14.027775864   11.09 10.57 10.082 9.77 G0Vn 202 0
20 HD 119931A EB* 13 46 06.7580872776 +05 06 56.197473948   8.44 7.82     F8V 177 0
21 HD 119931 ** 13 46 06.7604502 +05 06 56.161493   8.92 8.54 8.03   G0 176 0
22 V* AR Boo EB* 13 48 10.3997464104 +24 55 27.046249824     12.86     G9+K1 73 0
23 V* TU Boo EB* 14 04 58.0474207248 +30 00 01.588156992   12.22 11.61 11.422 11.063 G3 84 0
24 V* VW Boo SB* 14 17 26.0324550672 +12 34 03.446878260   11.33 10.55 10.054 9.777 G5V 117 0
25 V* AC Boo EB* 14 56 28.3364345040 +46 21 44.069135868   10.74 10.23 9.641 9.296 F8Vn 137 0
26 GSC 02568-00991 PM* 15 00 42.5997726072 +35 05 16.859185872     11.67     ~ 7 0
27 V* TY Boo EB* 15 00 46.9394379816 +35 07 54.742318356   12.03 11.39 10.398 10.006 G3+G7 139 0
28 TYC 2568-997-1 * 15 00 53.6777926224 +35 02 59.761238928   11.96 11.59     ~ 5 0
29 V* TZ Boo SB* 15 08 09.1351483800 +39 58 12.863284788   11.033 10.41 10.04 9.671 G2Vn 221 0
30 V* OU Ser SB* 15 22 43.4747590291 +16 15 40.733742473   8.84 8.266 7.8 7.494 G1 99 0
31 V* V842 Her SB* 16 06 02.2124477136 +50 11 13.104375288   10.523 9.979 9.488 9.163 G2 89 0
32 V* V2357 Oph SB* 16 57 16.7622100968 +10 59 51.395498736   11.38 10.48 10.25 9.879 G5V 57 0
33 V* V728 Her EB* 17 18 04.2960486792 +41 50 38.707746684   11.25 10.61 10.658 10.416 F0 93 0
34 V* GM Dra SB* 17 20 21.8832019536 +57 58 27.057071532   9.30 8.77     F8 70 0
35 V* V566 Oph SB* 17 56 52.4103516432 +04 59 15.326210328   8.03 7.58     F5V 262 0
36 V* LS Del SB* 20 57 10.2862100664 +19 38 59.247220704   9.178 8.722 8.3 8.054 F5/8V 79 0
37 V* BX Peg EB* 21 38 49.3910800824 +26 41 34.213405092     10.890     G4.5 142 0
38 V* WZ Cep EB* 23 22 24.1931441496 +72 54 56.834312652   11.97 11.48 11.024 10.638 F5 75 0
39 V* U Peg SB* 23 57 58.4766636672 +15 57 10.087001640   10.26 9.63 8.871 8.970 G2V 252 0

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