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γ Dor: A pulsating component of KIC 8043961 in a stellar triple system

Abstract: We present new findings about KIC 8043961. We find the effective temperatures of the components as 6900±200 K for the primary, and 6598±200 K for the secondary, while the logarithm of the surface gravities are found to be 4.06 cm s−2 and 3.77 cm s−2, respecti

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A search for pulsation in twenty-one white dwarfs

Abstract: Well-defined astrophysical constraints of white dwarfs (WDs), such as on the presence or absence of pulsational variability, are very much needed to refine and develop current models. Because these stars are rather faint and variability periods are mostly bel

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The influence of the mass distribution of stellar objects on their gravitational fields

Abstract: We study the influence of the mass randomness of astronomical objects on the distribution function of their gravitational fields. Based on purely theoretical arguments and on a comparison with extensive data collected from observations and numerical simulatio

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Infrared transitions of diatomic molecules and the telluric lines

Abstract: We present a simple model, as a pedagogical exercise, in order to obtain infrared transition energies for heteronuclear diatomic molecules, based on rotational and vibrational Hamiltonians. Our calculations allow us to identify CO absorption lines that are pr

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First photometric investigation of two eclipsing binary systems CRTS J213033.6+213159 and 1SWASP J212454.61+203030.8

Abstract: The multicolour CCD light curves of the eclipsing binary systems CRTS J213033.6+213159 and 1SWASP J212454.61+203030.8 are presented for the first time, the observations are analyzed using the latest version of the Wilson-Devinney code. Both the systems are fo

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The ADF and the t2 formalism in H II regions based on the upper mass limit of the IMF for the MW

Abstract: We study in depth the abundance discrepancy problem in H II regions, this time from a different perspective than the usual one: by studying the effect of the upper mass limit (Mup) of the initial mass function (IMF) on the O, C, and He predicted by chemical e

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An astrometric and photometric study of the intermediate-age open cluster NGC 2158 and its eclipsing binary NBN201578

Abstract: We present a photometric and astrometric analysis of the NGC 2158 cluster using Gaia DR2 and 2MASS data. The cluster age, color excess, intrinsic distance modulus and distance are calculated to be t = 2.240 ± 0.260Gyr, E(B − V ) =0.420±0.050mag, (m−M)⊙=1

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Photometric study of three short period variable stars

Abstract: We have obtained uvby−β photoelectric photometry with the 0.84 m telescope at the San Pedro Mártir Observatory, México, for the stars HD 115520, HD 220735 and HD 26738. The first two had been previously determined to be variables whereas the last one is being

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Dynamics around an asteroid modeled as a mass tripole

Abstract: The orbital dynamics of a spacecraft orbiting around irregular small celestial bodies is a challenging problem. Difficulties to model the gravity field of these bodies arise from the poor knowledge of the exact shape as observed from the Earth. In order to un

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Analysis of a short periodic pulsator: SX phoenicis star XX Cyg

Abstract: Photometric observations were made of the SX Phoenicis star XX Cyg between September and October 2019, using the 1.88-m Kottamia reflector telescope in Egypt. We used 340 CCD observations with blue-visible-red (BVR) filters to derive light curves. In addition

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Thirteen years of weather statistics at San Pedro Mártir Observatory

Abstract: We present weather statistics for thirteen years of data gathered with the meteorological stations at Observatorio Astronómico Nacional in the Sierra San Pedro Mártir (OAN-SPM) over the period 2007-2019. These weather stations include sensors that measure var

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Four new γ Doradus variables in eclipsing binaries: revised pulsation period relations
O. Özdarcan Ö. Çakirli

Abstract: We present photometric light curve modelling of four Kepler eclipsing binaries KIC2720354, KIC10063044, KIC11724091 and KIC8565912. The modelling results show that KIC10063044 is a semi-detached eclipsing binary, while the other systems are detached eclipsing

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