2013AJ....145...60Y


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST03:01:53

2013AJ....145...60Y - Astron. J., 145, 60 (2013/March-0)

Photometric studies of three neglected short-period contact binaries GN Bootis, BL Leonis, and V1918 Cygni.

YANG Y.-G., QIAN S.-B. and DAI H.-F.

Abstract (from CDS):

We present new photometry for three short-period contact binaries, GN Boo, BL Leo, and V1918 Cyg, observed from 2008 December to 2012 April using several small telescopes in China. Photometric models were deduced from new observations using the updated Wilson-Devinney Code. The results show that GN Boo and BL Leo are W-type contact binaries, while V1918 Cyg is an A-type one. The mass ratios and fill-out factors are q = 0.320(± 0.002) and f = 5.8(± 0.1)% for GN Boo, q = 0.476(± 0.005) and f = 21.3(± 1.1)% for BL Leo, q = 0.264(± 0.002), and f = 49.7(± 0.7)% for V1918 Cyg, respectively. From the (O - C) curves, it is discovered that the orbital periods of three binaries have varied in a complicated way, i.e., cyclic oscillation for GN Boo, long-term period decrease for BL Leo, and both for V1918 Cyg. The cyclic variations for GN Boo and V1918 Cyg may probably be attributed to the magnetic activity of the primary component or light-time effect due to the third body. Meanwhile, the secular period decreases for BL Leo and V1918 Cyg may result from mass transfer from the primary to the secondary, accompanying the mass and angular momentum loss from the central system. Finally, GN Boo, BL Leo, and V1918 Cyg will evolve into deep contact binaries. Additionally, a statistical study of 37 contact binaries with decreasing periods is given. We obtained the relations of q - f and q - dln P/dt, and preliminarily determined the mass loss rate of dln M/dt from the binary system.

Abstract Copyright:

Journal keyword(s): binaries: close - binaries: eclipsing - stars: individual (GN Boo, BL Leo, V1918 Cyg)

VizieR on-line data: <Available at CDS (J/AJ/145/60): table1.dat table2a.dat table2b.dat table3.dat table4.dat table5.dat table6.dat table7.dat refs.dat>

Simbad objects: 45

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Number of rows : 45

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* CW Cas EB* 00 45 52.7049598333 +63 05 08.453600159   12.10 11.31     G8V 93 0
2 V* BS Cas EB* 01 21 38.5728258517 +59 10 26.971967229   12.34 11.84     A-F 48 0
3 V* SS Ari EB* 02 04 18.4070835062 +24 00 02.292158581   11.00 10.15     G0 103 0
4 V* VZ Tri EB* 02 21 29.8549488660 +31 58 46.172862687   12.91 12.26     ~ 15 0
5 V* AH Tau EB* 03 47 11.9661572429 +25 06 59.376879495   11.59 11.07 11.09   G1p 74 0
6 V* AO Cam EB* 04 28 13.6470237835 +53 02 44.465212969   11.23 10.51     G0V 87 0
7 V* IK Per bL* 04 29 27.4559757386 +42 03 10.588508212   12.17 11.49     A2 50 0
8 V* V781 Tau WU* 05 50 13.1257943382 +26 57 43.362139205   9.28 8.67   7.976 G0 93 0
9 V* V396 Mon WU* 06 38 36.4832788006 +03 36 17.153067811           ~ 50 0
10 V* FG Gem Al* 06 47 49.6576112728 +16 51 47.687343529   12.70 12.37 12.21   G2V 36 0
11 V* V524 Mon WU* 06 59 01.1912380994 +02 12 51.490158702           ~ 28 1
12 V* EH Cnc EB* 08 26 18.3528738101 +20 52 49.727863442     12.30 11.845   ~ 39 0
13 V* XY LMi EB* 10 34 12.3397993409 +32 08 51.689702888   11.78 11.20     ~ 21 0
14 V* AP Leo WU* 11 05 05.0210506008 +05 09 06.407478312   10.07 9.57   8.849 F8V 110 0
15 V* BM UMa EB* 11 11 20.4771435569 +46 25 47.237595074     14.03 14.02   K0V 54 0
16 V* TV Mus WU* 11 39 57.7650431238 -64 48 59.218089690   11.48 10.75   9.712 F2 63 0
17 GSC 01985-00975 * 11 45 18.4244789511 +24 46 05.065838471     13.7 14.02   ~ 2 0
18 V* BL Leo EB* 11 45 38.3936325660 +24 46 50.747795434     13.51     ~ 29 0
19 BD+25 2413 * 11 45 54.2413587546 +24 49 16.334188123   11.26 9.91     M0 1 0
20 V* CC Com WU* 12 12 06.0377635998 +22 31 58.684494436   13.09 11.42   10.085 K4/5V 195 0
21 V* RW Com EB* 12 33 00.2841958714 +26 42 58.362399221   12.33 11.682 10.929   G8e 143 0
22 V* DF CVn EB* 12 43 37.2401015890 +38 44 15.626945790   11.89 11.032 10.808   ~ 37 0
23 V* BI CVn EB* 13 03 16.4093211549 +36 37 00.645296050   10.99 10.31     F9V 78 0
24 V* EI CVn EB* 14 02 05.5579458138 +34 02 40.038113389   13.00 12.21     K5 27 0
25 V* VW Boo EB* 14 17 26.0324383137 +12 34 03.449790911   11.33 10.55   9.777 G5 98 0
26 V* HH Boo EB* 14 21 44.0750923555 +46 41 59.352365882   11.80 11.021 10.869   G5III 25 0
27 V* GR Vir WU* 14 45 20.2633088053 -06 44 04.130465519   8.54 8.00   7.34 G2/3V 121 0
28 V* GN Boo EB* 14 50 07.7680600318 +29 38 58.539539256   12.04 11.12     ~ 38 0
29 TYC 2022-287-1 * 14 50 31.4832303088 +29 35 18.965743397   12.00 11.65     ~ 2 0
30 TYC 2022-219-1 * 14 50 47.2235185779 +29 42 48.183698354   12.39 11.97     ~ 3 0
31 V* FT Lup bL* 14 59 52.6999181970 -42 58 59.101589341   10.27 9.82     F0V 55 0
32 V* TY Boo EB* 15 00 46.9394774048 +35 07 54.743547575   12.03 11.39 11.38   G3+G7 121 0
33 V* TZ Boo EB* 15 08 09.1344964536 +39 58 12.864002715   10.60       G2Vn 189 0
34 V* AU Ser WU* 15 56 49.4688123911 +22 16 01.590194012   11.76 11.04 10.93   G4V 93 0
35 V* V502 Oph WU* 16 41 20.8609964438 +00 30 27.383882425   9.15 8.50   7.865 G2V+F9V 173 0
36 TYC 3555-1923-1 * 19 25 51.8824461674 +52 23 06.748891613   12.55 12.08     F0III-IV 2 0
37 V* V1918 Cyg EB* 19 26 08.6645183768 +52 26 47.591022496   11.34 10.76     ~ 30 0
38 GSC 03555-01771 * 19 29 27.0464089876 +52 03 31.897201819   13.43 12.50 12.32   G5 2 0
39 V* V417 Aql EB* 19 35 24.1195541620 +05 50 17.659050699   11.23 10.63     G0V+F9V 110 0
40 V* LT Pav WU* 19 48 36.0999246919 -71 01 33.737682876           F9-G0 15 0
41 V* VW Cep EB* 20 37 21.6248469581 +75 36 01.889162699   8.13   7.0   G8V+K0V 523 0
42 V* V1073 Cyg WU* 21 25 00.3572317438 +33 41 14.937113872   8.78 8.38     A1VpSi: 127 0
43 V* BX Peg EB* 21 38 49.3905754055 +26 41 34.205957391     10.890     G4.5 126 0
44 V* BE Cep EB* 22 41 20.8001593915 +58 36 31.131808940   12.94 12.05     ~ 42 0
45 V* U Peg WU* 23 57 58.4767547238 +15 57 10.083936262   10.26 9.63   8.970 G2V 235 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-03:01:53

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