2011A&A...527A..43Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST18:42:25

2011A&A...527A..43Z - Astronomy and Astrophysics, volume 527A, 43-43 (2011/3-1)

V456 Ophiuchi and V490 Cygni: systems with the shortest apsidal-motion periods.

ZASCHE P. and WOLF M.

Abstract (from CDS):

Our main aim is the first detailed analysis of the two eclipsing binaries V456 Oph and V490 Cyg. The system V456 Oph has been studied both photometrically via an analysis of its light curve observed by the INTEGRAL/OMC and by the period analysis of all available times of minima. V490 Cyg has been studied by means of a period analysis only. Many new times of minima for both systems have recently been observed and derived. This allows us for the first time to study in detail the processes that affect both binaries. The main result is the discovery that both systems have eccentric orbits. For V456 Oph we deal with the eccentric eclipsing binary system with the shortest orbital period known (about 1.016 day), while the apsidal motion period is about 23 years. V490 Cyg represents the eclipsing system with the shortest apsidal motion period (about 18.8 years only). The two components of V456 Oph are probably of spectral type F. We compare and discuss the V456 Oph results from the light curve and the period analysis, but a more detailed spectroscopy is needed to confirm the physical parameters of the components more precisely.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - stars: individual: V456 Oph - stars: individual: V490 Cyg - stars: fundamental parameters

Simbad objects: 6

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Number of rows : 6

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* V381 Cas bL* 00 32 51.6072075016 +49 19 39.328310508   10.11 10.22 10.255   B 39 0
2 V* GL Car Al* 11 14 39.8365120843 -60 39 36.365270733 9.09 10.02 9.74 9.86   B3:V 82 0
3 V* U Oph Al* 17 16 31.7132736201 +01 12 37.996480495   5.941 5.921     B3V 360 1
4 V* V456 Oph Al* 18 43 05.8235241210 +08 50 23.299425516   10.38 10.08     A2 23 0
5 V* V490 Cyg bL* 20 09 57.0085691480 +31 22 11.752846701           F8 18 0
6 V* V478 Cyg Al* 20 19 38.7475966004 +38 20 09.193010946   9.16 8.767     B0Vp 173 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-18:42:25

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