共查询到20条相似文献，搜索用时 31 毫秒
1.
In this study we present photometric observations of the eclipsing binary KR Cyg made in 1999 and 2000. The observations of
the eclipsing binary KR Cyg have been carried out in B, V and R colours at the Ege University Observatory. A new seasonal
light curves are presented. New times of minima and ephemerides are given. Based on a statistical analysis of the times of
minima obtained by photoelectric photometry, the orbital period of the system is found to be constant. The photometric mass
ratio of the system is well determined. The corresponding light curves were analyzed by the Wilson-Devinney code.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
2.
D. Baade H. W. Duerbeck M. T. Karimie A. Yamasaki 《Astrophysics and Space Science》1982,88(1):197-204
UBV observations of the short-period eclipsing binary BW Eri are reported and analyzed. The photometric parameters are determined. BW Eri is a detached or semidetached system. 相似文献
3.
Two-colour photoelectric observations of the eclipsing binary AT Pegasi have been carried out at the Ege University Observatory. The light curves were analyzed with the methods of Wood and Wilson-Devinney. It is found that the period of the system is decreasing. The system was found to be an Algol type semi-detached binary. The absolute elements of the system are also deduced. 相似文献
4.
297UBV observations of the Algol type eclipsing binary Y Hyi are presented and analyzed by a synthetic light curve technique. The system is semi-detached and shows complete eclipses.Based on observations collected at the European Southern Observatory, La Silla, Chile. 相似文献
5.
UBV observations of the short-period eclipsing binary BV Eri are reported and analyzed. The radial velocity curve is given. The system shows a light curve distortion, making an analysis difficult. The secondary fills its critical Roche lobe. The system seems to be in an interesting evolutionary. 相似文献
6.
Photoelectric observations of the eclipsing binary GO Cyg have been carried out inB andV colours at the Ege University Observatory. The corresponding light curves were analyzed by the method of Wilson-Devinney. The system was found to be a reverse Algol semi-detached binary. The absolute elements of the system are also deduced. 相似文献
7.
St. Raetz M. Va&#x;ko M. Mugrauer T.O.B. Schmidt T. Roell T. Eisenbeiss M. M. Hohle A. Koeltzsch Ch. Ginski C. Marka M. Moualla N. Tetzlaff Ch. Broeg R. Neuhuser 《Astronomische Nachrichten》2009,330(5):504-510
We report on observations of the eclipsing binary 2MASS 19090585+4911585 with the 25 cm auxiliary telescope of the University Observatory Jena. We show that a nearby brighter star (2MASS 19090783+4912085) was previously misclassified as the eclipsing binary and find 2MASS 19090585+4911585 to be the true source of variation. We present photometric analysis of VRI light curves. The system is an overcontact binary of W UMa type with an orbital period of (0.288374 ± 0.000010) d (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
8.
Summary The bright massive object η Orionis is at the same time a totally eclipsing system, a spectroscopic triple system, a speckle
triple system and a visual binary. These circumstances offer an exceptional opportunity for determining the physical parameters
of massive stars. Our observations show that the published elements are wrong. We present a new determination of several parameters
of the multiple system and propose new visual observations.
Based on observations collected with the Swiss Telescope at the European Southern Observatory, La Silla, Chile. 相似文献
9.
The eclipsing binary system AI Dra reveals changes of its orbital period. These variations could be described as a result
of orbiting the eclipsing pair around a common center of mass with two unseen companions with the periods about 18 and 43 years
together with a steady period increase. Fourteen new minima observations were carried out by the authors. 相似文献
10.
PhotoelectricUBV differential observations of the eclipsing binary SVS 2086 are presented. The system shows a W UMa-type light curve, with an amplitude of 0.5 inV light; the period seems to be longer than previously believed. 相似文献
11.
D. Chochol T. Pribulla M. Vaňko P. Mayer M. Wolf P. G. Niarchos K. D. Gazeas V. N. Manimanis L. Brát M. Zejda 《Astrophysics and Space Science》2006,304(1-4):93-96
Orbital period changes of the eclipsing binaries GO Cyg and GW Cep are explained by the light-time effect for the first time. New minima of the eclipsing binary AR Aur improve the predicted light-time orbit. The light-time orbit with the quadratic ephemeris of the binary matches the new observations of V505 Sgr better than the linear one. As the light-time effect fits in corresponding O − C diagrams of all four systems have been reaching extreme values, the observations of minima times in forthcoming years are highly desirable. 相似文献
12.
NSVS?07826147 and NSVS?04818255 were suspected as possible eclipsing sdB binary systems by Kelley and Shaw. In order to investigate the short period eclipsing sdB binaries, we have listed them as our observing targets and began to monitor it from March 2009. Till now, we have obtained four complete CCD light curves and 16 high precise times of light minimum of NSVS?07826147. All light curves show strong reflection and a very narrow eclipse, which implies that NSVS?07826147 should be a new short period eclipsing sdB binary. For the system NSVS?04818255, no eclipse character was found in the light curves according to our observations. However, we found that a star near NSVS?04818255 is a close binary system with a period of about 0.32498 days. Up to now, only seven short period eclipsing sdB binary systems have been found, including NSVS?07826147. With the new precise epochs obtained by us, the new period of this system is derived as 0.16177046(5) days, which can be used to predict the epochs of light minimum. Furthermore, the light curves of NSVS?07826147 are analyzed using the Wilson–Van Hamme code and the testing photometric solutions are presented and discussed. 相似文献
13.
Astrophysics - We present International Ultraviolet Explorer (IUE) observations of the luminous, non- eclipsing, double lined spectroscopic binary system UX Ari over the period 1978-1996. Three... 相似文献
14.
U, B, V photoelectric observations of the eclipsing binary system DX Aqr, secured in 1981, have been presented. Present results, when compared with earlier ones (cf. Srivastava and Sinha, 1985), suggest that the features of the system are changing. Some new features are reported. 相似文献
15.
We present new photoelectric observations of the eclipsing binary system AB Cas, together with an analysis of the light curves.
Using the available times of light minimum reported in the literature together with our own minima, period changes are monitored,
and the possible third-body parameters are obtained. The absolute properties of the system and the delta-Scuti behavior of
the primary are also discussed. 相似文献
16.
本文给出了首次食双星V375 Cas的BV两色光电测光资料和新的历元,并用Wilson-Devinney综合光变曲线方法取得测光解。结果表明:V375 Cas是一个类似RZ Dra的早型半相接双星系统,小质量子星充满了临界等位面,而大质量子星几乎充满了临界等位面,此星对于了解早型密近双星的演化是很有意义的。 相似文献
17.
Zhang Rong-Xian Zhang Ji-tong Li Qi-sheng Zhai Di-sheng 《Chinese Astronomy and Astrophysics》1986,10(4):265-271
Some 604 photoelectric BV observations of the eclipsing binary V375 Cas were obtained at Beijing Observatory from August to November 1982. Photometric solution was carried out using the Wilson-Devinney program for the BV light curves. The system is found to be a semidetached binary in which the less massive component fills its Roche lobe and the more massive component nearly does so. It is very similar to RZ Dra. This very interesting system is important for the understanding of the evolution of close binaries. 相似文献
18.
We present a photometric analysis of the eclipsing binary systemGSC4832.400 based on 732 photometric observations obtained on sixteen clear nights during 1999–2000 in the V-Johnson and yb-Strömgren filters. The observed times of the minima yielded a linear ephemeris showing that the system has a constant period of 0.313150 ± 0.000002days. The light curve corresponds to a circular orbit for the system and clearly shows that GSC4832.400 has the defining characteristics of a W UMa-type eclipsing binary. It also shows a small O'Connell effect, which could be due to the presence of a hot spot in the primary star. A preliminary photometric solution based on the assumption of an over contact systemsatis factorily reproduced the observed light curve. 相似文献
19.
Esat Hamzaoğlu 《Astrophysics and Space Science》1981,77(1):221-233
Spectroscopic observations of the white-dwarf eclipsing binary V471 Tauri are reported. The behaviour of the H and K emission lines of Caii are investigated relative to the photoelectric observations, and the existence of a probable correlation between minimum emission line strength and the maximum wave position within the migrating wave is demonstrated. 相似文献
20.
Photoelectric observations inB andV of the eclipsing binary U Pegasi, made during 1980 with the 48 in. reflector of the National Observatory of Athens, are presented and discussed. The light curve seems to have remained constant since 1958 while the period of the system continues to decrease. 相似文献