2008A&A...477..615S


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.25CEST03:09:04

2008A&A...477..615S - Astronomy and Astrophysics, volume 477, 615-620 (2008/1-2)

Rapid apsidal motion in eccentric eclipsing binaries: OX Cassiopeia, PV Cassiopeia, and CO Lacertae.

SVARICEK P., WOLF M., CLARET A., KOTKOVA L., BRAT L., SMELCER L. and ZEJDA M.

Abstract (from CDS):

Double-lined eclipsing binaries are a traditional tool to test the capability of the stellar evolutionary models. If such binaries show apsidal motion, it is also possible to check, in addition to their absolute dimensions, some aspects of their internal structure. In order to perform this additional test, we monitored the times of a minimum of three eclipsing binaries with accurate absolute dimensions. Approximately thirty new precise times of minimum light recorded with CCD photometers were obtained for three early-type eccentric-orbit eclipsing binaries OX Cas (P=2.49d, e=0.041), PV Cas (1.75d, 0.032), and CO Lac (1.54d, 0.029). O-C diagrams were analyzed by the Lacy's method using all reliable timings found in the literature, and the elements of apsidal motion were improved. On the other hand, stellar models computed for the precise observed masses of the three systems were used as theoretical tools to compare with the observed shift in the periastron position. We confirm very short periods of apsidal motion of approximately 38.2, 91.0, and 43.4 years for OX Cas, PV Cas, and CO Lac, respectively. The relativistic effects are negligible, being up to 6% of the total apsidal motion rate in all systems. The corresponding observed apsidal motion rates are in good agreement with the theoretical predictions, except for the case of PV Cas, whose components seem to be more mass concentrated than the models predict.

Abstract Copyright:

Journal keyword(s): stars: binaries: eclipsing - stars: individual: OX Cas - stars: individual: PV Cas - stars: individual: CO Lac - stars: fundamental parameters - stars: early-type

Simbad objects: 9

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Number of rows : 9

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 BD-17 6862 PM* 00 01 25.8393264009 -16 56 54.387315847 13.478 12.29 10.62 10.370 9.026 K7.0V 37 0
2 HD 240 * 00 07 11.7575316901 -02 42 54.405471164   10.02 8.86     K0/1II/III 3 0
3 NGC 381 OpC 01 08 19.9 +61 35 02     9.3     ~ 50 0
4 V* OX Cas Al* 01 09 00.0987902761 +61 28 14.837498256 9.71 10.18 9.9     B6+G0 88 0
5 V* GL Car Al* 11 14 39.8365120843 -60 39 36.365270733 9.09 10.02 9.74 9.86   B3:V 82 0
6 V* U Oph Al* 17 16 31.7132736201 +01 12 37.996480495   5.941 5.921     B3V 360 1
7 V* V478 Cyg Al* 20 19 38.7475966004 +38 20 09.193010946   9.16 8.767     B0Vp 173 0
8 V* CO Lac Al* 22 46 30.0012980808 +56 49 31.634058719   10.46 10.40     B9V 106 0
9 V* PV Cas Al* 23 10 02.5753027388 +59 12 06.146578124   9.98 9.86     B6V 141 0

    Equat.    Gal    SGal    Ecl

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2020.09.25-03:09:04

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