共查询到20条相似文献，搜索用时 31 毫秒
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2.
Necdet Güdür 《Astrophysics and Space Science》1978,57(1):17-39
The detached eclipsing binary system AG Per was observed at Ege University Observatory on 12 nights from December 1974 to December 1975. Approximately 460 observations were obtained in each yellow and blue. AG Per has long been known to have an apsidal motion and eccentricities. New apsidal motion parameters based on the author's observations and all of the other minima are given. Solutions for its orbital elements were carried out using three different procedures: the Kitamura method, Wood triaxial ellipsoid model and Kopal's Fourier analysis method in the frequency-domain. By use of the available spectroscopic data for AG Per, the observational apsidal motion constant has been calculated. 相似文献
3.
Basing on recent and old photoelectric times of minimum, a new slightly longer period of the apsidal motion for an eclipsing binary PV Cas has been obtained. A difference between observed and theoretical periods of the apsidal motion estimated on the base of Claret and Gimenez models growed up to 30 years is found. 相似文献
4.
ö.L. Değirmenci 《Astrophysics and Space Science》1997,253(2):237-252
Photoelectric observations of the eclipsing binary IQ Persei have been carried out in B and V colours at Ege University Observatory.
The corresponding light curves were analyzed by synthesis techniques. The absolute physical parameters and apsidal motion
period (122 yr) of the system were obtained. The results have been compared with theoretical evolutionary models which include
both mass loss and convective overshooting. Theoretical evolutionary tracks of the component stars indicate an age of 1.3
× 108 years and an apsidal motion constant of 0.0040 which is greater than its observed value by only about 5%. The A7 secondary
of the eclipsing pair is still close to the zero-age main sequence but B7 primary is about halfway through its main sequence
life-time.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
5.
B and V photometry of the eccentric eclipsing binary DI Her is reported, with the aim of contributing to a more accurate determination
of the timings required for the ongoing apsidal motion studies. The resulting apsidal motion rate is close to the one reported
earlier by Khodykin and Volkov (1989), Guinan, Marshal and Maloney (IBVS 4101), and Yildiz et al. (2000).
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
6.
The aim of the present paper is to analyze the light variation as well as the period changes of the eclipsing binary RZ Cas. New photometric elements are computed using the frequency-domain method. The possibility of the light-time effect and the apsidal motion is discussed. 相似文献
7.
Multi-colourWBVR photoelectric observations of the eclipsing binaries IT Cas, CO Cep, and AI Hya were carried out. The photometric elements and the absolute parameters of the orbits and components were obtained. The valuation of the angular rate of the apsidal motion of AI Hya based on the comparison of our observations with the previous photoelectric light curve of this system was derived. 相似文献
8.
Several new times of minimum light recorded with photoelectric or CCD means have been gathered for the eccentric eclipsing
binary V889 Aql (P = 11.1 days, e = 0.37). Its O–C diagram is presented, and improved elements of the apsidal motion and the light-time effect (LITE) are given. We found a
long apsidal motion period of about 24 400 ± 2400 years and a period of the third body of about 52 ± 2 years. 相似文献
9.
BP Vulpeculae is a bright eclipsing binary system showing apsidal motion. It was found in an earlier study that it shows retrograde apsidal motion which contradicts theory. In this paper we present the first BV light curve of the system and its light curve solution as well as seven new times of the minima from the years 1959–1963. This way we could expanded the baseline of the investigation to five decades. Based on this longer baseline we concluded that the apsidal motion is prograde agreeing with the theoretical expectations and its period is about 365 years and the determined internal structure constant is close to the theoretically expected one. 相似文献
10.
Photometric observations of the eccentric eclipsing binary V1143 Cyg were performed during Aug.–Sep. 2000 and July 2002, in
Johnson B and V bands. The analysis of both light curves was made separately using the 1998 version of Wilson’s LC code. In order to find
a new observed rate of apsidal motion, we followed the procedure described by Guinan and Maloney (1985). A new observed rate
of apsidal motion of 3∘.72/100 yr was computed, which is close to the one reported earlier by Khaliullin (1983), Gimenez and Margrave (1985), and
Burns et al. (1996). 相似文献
11.
Photometric observation of the eccentric eclipsing binary V459 Cas (e = 0.0244) was performed to find a new rate of apsidal motion. Also the advance of the periastron is calculated theoretically by taking into account the Newtonian (classical) and general-relativistic effects according to physical and orbital parameters of the system. A new observed rate of apsidal motion of 19∘.8/100 yr is computed which is not in agreement with the one reported earlier. Meanwhile a theoretical value of 2∘.64/100 yr is obtained which is 7.49 times smaller than the observed one. 相似文献
12.
İ. Bulut 《New Astronomy》2009,14(7):604-606
The apsidal motion analysis of the eccentric eclipsing binaries: V397 Cep, V493 Car and BW Aqr have been presented. The method described by Lacy (1992) [Lacy, C.H S., 1992. AJ 104, 2213] has been used for the apsidal motion analysis. The apsidal motion periods have been found to be 174.2 ± 1.4, 277.3 ± 21.3 and 7195 ± 174 years for V397 Cep, V493 Car and BW Aqr, respectively. 相似文献
13.
Multi-colourWBVR photoelectric observations of the eclipsing binary OX Cas were carried out. The photometric elements, absolute parameters and the angular rate of the apsidal motion (
= 9.1 deg yr–1 were obtained. The apsidal parameterk
2 derived for this system is by 15–25% smaller than the theoretical parameterk
2. 相似文献
14.
Alvaro Giménez 《Experimental Astronomy》1994,5(1-2):91-97
The observation of apsidal motions in eclipsing binaries is a very rewarding area of research which requires only moderate or small telescopes equipped with a photoelectric photometer. Important contributions can be made to the study of stellar internal structure through these observations, as well as the verification of the theory of general relativity using the equations of orbital motion. The main objectives of such an observational effort are described, together with a list of candidate binary systems. An appeal to photometrists with small telescopes around the world is made to observe these eccentric and well-detached eclipsing binaries. 相似文献
15.
P. Zasche 《New Astronomy》2012,17(8):687-690
Analyzing available photometry from Hipparcos, ASAS, Pi of the sky and Super WASP, we found that the system SY Phe is a detached eclipsing binary with similar components and orbital period about 5.27089 days. It has a slightly eccentric orbit, however the apsidal motion is probably very slow. The system undergoes an additional photometric variation on longer time scales superimposed on the eclipsing light curve. It also contains one distant component, hence the third light was also considered. 相似文献
16.
M. Wolf L. Šmelcer H. Kučáková T. Hynek K. Onderková P. Svoboda M. Chrastina 《New Astronomy》2010,15(6):530-532
V381 Cas is a relatively bright and early-type eclipsing binary system. Several new times of its eclipses were measured as part of our long-term observational project of eccentric eclipsing binaries. Based on a current O–C diagram solution, we found for the first time that its orbit is slightly eccentric (e = 0.025) and shows a very rapid apsidal advance with short period of about 20 years only. The relativistic and third body effects are negligible, being about 3% of the total apsidal motion rate. 相似文献
17.
Marek Wolf P. G. Niarchos K. D. Gazeas V. N. Manimanis Lenka Kotková Anton Paschke Miloslav Zejda 《Astrophysics and Space Science》2006,304(1-4):181-183
Seven new precise times of minimum light have been gathered for the triple eccentric eclipsing binary YY Sgr (P = 2d.63, e = 0.16). Its O--C diagram is presented and improved elements of the apsidal motion and the light-time effect are given. We found a new short period of the third body of about 18.5 years in an eccentric orbit (e
3 ≃ 0.4). 相似文献
18.
V. S. Kozyreva 《Astrophysics and Space Science》1990,165(1):1-7
Multi-colourWBVR photoelectric observations of the eclipsing binary HP Aur were carried out. The photometric elements, the absolute parameters and the apsidal motion angular rate of HP Aur based on the comparison of our observations and the observations Meinunger (1980) obtained were presented. The derived value of
is almost three times smaller than that predicted theoretically. 相似文献
19.
William Tobin 《Experimental Astronomy》1994,5(1-2):67-74
This paper reviews recent progress in CCD photometry of eclipsing binary systems in the crowded fields of the Magellanic Clouds. Some preliminary findings are given. The interesting eccentric system HV2274 is noted as important for follow-up studies, particularly concerning its apsidal motion. Some further developments are anticipated. 相似文献