2018PASP..130g4201L


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.29CET22:12:21

2018PASP..130g4201L - Publ. Astron. Soc. Pac., 130, part no 7, 4201-74201 (2018/July-0)

Photometric study of Two totally eclipsing contact binaries: V789 Her and V1007 Cas.

LI K., XIA Q.-Q., HU S.-M., GUO D.-F. and CHEN X.

Abstract (from CDS):

Two sets of V and Rc light curves of V789 Her and one complete set of BVRcIc light curves of V1007 Cas were observed and presented. By analyzing all these light curves together with the Sloan g'i' light curves observed by Kjurkchieva et al., we determined that both systems are W-subtype contact binaries and that V789 Her is a medium contact system, while V1007 Cas is a shallow contact system. Because the two binaries show totally eclipsing primary minima, the photometric results are reliable. In addition, the light curves of the two systems are asymmetric, requiring a dark spot on the primary or the secondary component in the modeling. By compiling all available times of minimum light including literatures, SuperWASP archive and ours, we analyzed the orbital period variations. We derived that the O - C diagram of V789 Her displays a periodic oscillation whose period and amplitude are 29.2 years and 0.0179 days and the period of V1007 Cas exhibits a continuous decrease at dP/dt = -1.78(±0.09) x 10–7 days yr–1. The cyclic period modulation of V789 Her is probably attributed to the light travel time effect via a tertiary companion with very small mass. The continuous period decrease of V1007 Cas may result from the mass transfer between the two components. However, we cannot rule out the possibility of angular momentum loss because V1007 Cas shows strong magnetic activity. By analyzing the evolutionary status of the components of the two systems, we determined that they exhibit typical characteristics of other W-subtype contact binaries.

Abstract Copyright: © 2018. The Astronomical Society of the Pacific. All rights reserved.

Journal keyword(s):

Simbad objects: 22

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Number of rows : 22

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* V1007 Cas EB* 00 08 03.3037469398 +51 08 02.881668470   13.4 11.997     ~ 14 0
2 TYC 3258-158-1 * 00 08 20.3590893039 +51 05 23.915483886   12.37 12.68     ~ 1 0
3 TYC 3258-962-1 * 00 08 21.6195500010 +51 07 07.899695581   13.00 12.57     ~ 1 0
4 2MASS J00164102-0009251 WU* 00 16 41.0250279708 -00 09 25.255256101           M0V 27 0
5 V* V523 Cas EB* 00 40 06.2678868929 +50 14 15.516158313       10.405   K4V 151 0
6 V* BS Cas EB* 01 21 38.5728258517 +59 10 26.971967229   12.34 11.84     A-F 48 0
7 V* V1107 Cas EB* 01 23 14.5926027854 +61 34 52.875446669   13.76 12.88 12.92 11.98 ~ 16 0
8 V* EP And EB* 01 42 29.3381398172 +44 45 42.455589306   11.81 11.40     F8V 56 0
9 V* V396 Mon WU* 06 38 36.4832788006 +03 36 17.153067811           ~ 50 0
10 V* KV Gem EB* 06 47 12.5755212331 +15 43 34.084796523     12.161     ~ 47 0
11 V* AD Cnc EB* 08 46 20.1002033642 +10 20 07.363744039   13.80 13.06     K0V 82 0
12 V* BM UMa EB* 11 11 20.4771435569 +46 25 47.237595074     14.03 14.02   K0V 55 0
13 V* LO Com EB* 12 32 04.9080489849 +26 22 47.825680655   14.0 13.29 12.5   ~ 38 0
14 V* MR Com EB* 13 14 24.1775983520 +27 11 32.085533351   13.31 12.36     ~ 27 0
15 V* IK Boo EB* 14 08 46.2091893305 +29 29 07.943885673   12.23 11.63 11.50   ~ 10 0
16 V* GN Boo EB* 14 50 07.7680600318 +29 38 58.539539256   12.04 11.12     ~ 38 0
17 GSC 03080-01094 * 17 05 39.19 +42 31 37.2           ~ 2 0
18 V* V789 Her EB* 17 05 41.4395119521 +42 30 44.712047252   14.9 14.47     ~ 17 0
19 GSC 03080-01169 * 17 05 50.6064 +42 33 26.676   14.3       ~ 1 0
20 V* V2284 Cyg EB* 19 29 55.0281271906 +48 55 00.187157645   12.6 13.135   12.345 G0.5V 39 0
21 V* V417 Aql EB* 19 35 24.1195541620 +05 50 17.659050699   11.23 10.63     G0V+F9V 111 0
22 V* BX Peg EB* 21 38 49.3905754055 +26 41 34.205957391     10.890     G4.5 126 0

    Equat.    Gal    SGal    Ecl

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2020.10.29-22:12:21

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