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The overcontact binary SS arietis
Nelson, Robert H.
New radial velocity and photometric data for SS Ari have been obtained and analysed using the 2003 versions of the Wilson-Devinney code. Values for fundamental quantities have been obtained: M1 = 0.510 (15) M⊙, M2 = 1.521 (26) M⊙, R1 = 0.87 (2) R⊙, R2 = 1.42 (2) R⊙
HD 240121 - An ACV variable showing anti-phase variations of the B and V light curves
Paunzen, Ernst; Gröbel, Rainer; Hümmerich, Stefan +1 more
The variability of HD 240121 = BD+59 2602 was first suspected by Särg and Wramdemark (1970) and later confirmed by Gröbel R. (1992a,b). Because of the observed anti-phase variations of the B and V light curves, the latter author tentatively suggested an ACV type. Apart from its inclusion in the catalog of New Suspected Variables (NSV 25977), no fu…
V421 Pegasi: a detached eclipsing binary with a possible γ Doradus component
Akan, C.; Çakırlı, Ö.; Özdarcan, O.
We present spectroscopic and photometric study of V421 Peg. This eclipsing binary displays lines from both components that are well separated. This allowed us to classify the primary and secondary component as F(1 ± 0.5) V and F(2 ± 0.5) V, respectively. We use our radial velocity measurements together with Hipparcos and ASAS photometry and apply …
"Constant" eclipsing binary in the instability strip
Çakırlı, Ö.
The eclipsing binary OO Peg consist of two late-A type stars in circular orbit with a period of 2.985 days. I use the high-resolution spectroscopic and extensive light curves from the ASAS and Hipparcos survey to measure the physical properties of the system. Previous attempts to model the light and radial velocity curves of the system have met wi…
Analysis of light curves and apsidal motion of neglected southern eclipsing binary V399 Pup
Bulut, İ.; Çiçek, C.; Bulut, A.
In this study, the Hipparcos and ASAS light curves of the eclipsing binary V399 Pup have been analyzed using the Wilson-Devinney program. The light curve analyses have found that V399 Pup is a detached binary system with eccentric orbit. The apsidal motion parameters of the system have been obtained from the O-C curve analyses. The system has been…
NR Peg: A new highly active semi-detached binary
Erdem, A.; Oblak, E.; Kurpińska-Winiarska, M. +1 more
This paper presents the first analysis of spectroscopic and photometric observations of the eclipsing binary star NR Peg. ELODIE Hα observations indicate that the secondary component is a chromospherically active star; however, the spectral line profiles (especially of neutral metals) of NR Peg are very wide and have a complex structure with asymm…
First identification and absolute magnitudes of the red clump stars in the Solar neighbourhood for WISE
Bilir, S.; Ak, T.; Karaali, S. +4 more
We present the first determination of absolute magnitudes for the red clump (RC) stars with the Wide-field Infrared Survey Explorer (WISE). We used recently reduced parallaxes taken from the Hipparcos catalogue and identified 3889 RC stars with the WISE photometry in the Solar neighbourhood. Mode values estimated from the distributions of absolute…
Early-type W UMa contact binary system: New data on V535 Ara
Özkardeş, B.; Erdem, A.
This paper presents the results of spectroscopic and photometric observations of the early-type W UMa system V535 Ara. New high-resolution spectra were taken at the Mt. John University Observatory in 2007. Radial velocities and spectroscopic orbital elements of the system were determined by applying KOREL spectral disentangling. The resulting orbi…
A critical analysis of three near-infrared photometric methods of estimating distances to cataclysmic variables
Gariety, Michael J.; Ringwald, F. A.
A critical analysis of three methods of estimating distances to cataclysmic variables (CVs) is performed. These methods, by Ak et al., Beuermann, and Knigge, all use near-infrared ( JHK or Ks) magnitudes and the Barnes-Evans relation. We compare all three methods to distances measured by trigonometric parallax by Thorstensen, with Hubbl…
New eccentric eclipsing binary in triple system: SY Phe
Zasche, P.
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 variatio…