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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⊙
The two eccentric eclipsing binaries in multiple systems: V539 Arae and V335 Serpentis
Wolf, M.; Zejda, M.; Mašek, M. +4 more
We present new results of our long-term observational project to analyze the variations of the orbital period for early-type eccentric eclipsing binaries. Altogether 77 new mid-eclipse times were measured or derived for two eclipsing binaries, namely V539 Ara and V335 Ser. Based on current O - C diagrams, we found in both systems that times of min…
First TESS light curve solution and orbital period analysis of V567 And
Öztürk, Oğuz
The photometric light curve of V567 And observed by the Transiting Exoplanet Survey Satellite (TESS) was solved for the first time in this study. According to the final model parameters, it was concluded that the system is a semi-detached eclipsing binary star system. The mass and radius values of the primary and secondary components were estimate…
XMM-Newton and Swift observations of the Seyfert 1 AGN NGC 5940
Adegoke, Oluwashina K.
Probing the physics of the accretion flow around active galactic nuclei (AGN) is crucial to understanding their emission mechanisms as well as being able to constrain the geometrical and variability properties of the different regions around them. The soft X-ray excess – usually observed below
The mass profile of NGC 3377 from a Bayesian approach
Caso, Juan P.
The mass profile for the moderately bright elliptical NGC 3377 is studied through a spherical Jeans analysis, combined with a Bayesian approach. The prior distributions are generated from dark matter simulations and observational constraints. The observational data set consist of Gemini/Gemini Multi-Object Spectrograph long-slit observations align…
Dynamical Architecture of the HD 107148 Planetary System
Trifonov, Trifon; Stock, Stephan; Henning, Thomas +15 more
We present an independent Doppler validation and dynamical orbital analysis of the two-planet system HD 107148, which was recently announced in Rosenthal et al. Our detailed analyses are based on literature HIRES data and newly obtained HARPS and CARMENES radial-velocity (RV) measurements as part of our survey in search for additional planets arou…
Seasonal Variations of Chemical Species and Haze in Titan's Upper Atmosphere
Fan, Siteng; Zhao, Daniel; Li, Cheng +3 more
Seasonal variation is significant in Titan's atmosphere owing to the large change of solar insolation resulting from Titan's 26.7° axial tilt relative to the plane of Saturn's orbit. Here we present an investigation of hydrocarbon and nitrile species in Titan's upper atmosphere at 400-1200 km, which includes the mesosphere and the lower thermosphe…
Oymaklardaki Yıldızların Fiziksel Özellikleri Üzerine: Yukarı Akrep Örneği
BAKIŞ, Volkan
Yıldız oymakları ve açık kümeler gibi yıldız topluluklarındaki üye yıldızların fiziksel parametrelerine ulaşmak bizi topluluğa ait temel fiziksel parametrelere (örn. yaş, başlangıç kütle fonksiyonu) götürür. Bu parametreler de galaksimizin dinamiğini anlamamız açısından gereklidir. Bu çalışmada yıldızların fiziksel özelliklerine (sıcaklık, yarıçap…
A dynamical evolution study of the open clusters: Berkeley 10, Berkeley 81, Berkeley 89 and Ruprecht 135
Çakmak, Hikmet; Karataş, Yüksel
By utilizing Gaia EDR3 photometric/astrometric data, we studied the dynamical evolution from the obtained astrophysical, structural and dynamical parameters of the open clusters (OCs), Berkeley 10 (Be 10), Berkeley 81 (Be 81), Berkeley 89 (Be 89), and Ruprecht 135 (Ru 135). The Gaia EDR3 photometric distances from the isochrone fitting method are …
BFS 10: a nascent bipolar H II region in a filamentary molecular cloud
Kerton, C. R.; Larose, Nicholas
We present a study of the compact blister H II region BFS 10 and its highly filamentary molecular cloud. We utilize 12CO observations from the Five College Radio Astronomy Observatory to determine the distance, size, mass, and velocity structure of the molecular cloud. Infrared observations obtained from the UKIRT Infrared Deep Sky Surv…