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Study of blazar activity in 10 year Fermi-LAT data and implications for TeV neutrino expectations

Abstract: Blazars are the most active extragalactic gamma-ray sources. They show sporadic bursts of activity, lasting from hours to months. In this work we present a 10-year analysis of a sample of bright sources detected by Fermi-LAT (100 MeV 300 GeV). Using 2-week bi

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Velocity segregation in a clump-like outflow with a non-top hat velocity cross-section

Abstract: High velocity clumps joined to the outflow source by emission with a “Hubble law” ramp of linearly increasing radial velocity vs. distance are observed in some planetary nebulae and in some outflows in star formation regions. We propose a simple model in whi

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On the effects of solar radiation pressure on the deviation of asteroids

Abstract: In this work, we study the effects of solar radiation pressure (SRP) on the problem of changing the orbit of an asteroid to support planetary defense, scientific research, or exploitation of materials. This alternative considers a tethered reflective balloon

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Estimating the propagation of a uniformly accelerated jet

Abstract: We study the problem of a Herbig-Haro jet with a uniformly accelerating ejection velocity, travelling into a uniform environment. For the ejection density we consider two cases: a time-independent density, and a time-independent mass loss rate. For these two

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Location and stability of the triangular points in the triaxial elliptic restricted three-body problem
M. Radwan Nihad. S. Abd El Motelp

Abstract: The main goal of the present paper is to evaluate the perturbed locations and investigate the linear stability of the triangular points. We studied the problem in the elliptic restricted three body problem frame of work. The problem is generalized in the sen

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A study of the secular variation of the high-amplitude Delta Scuti star AD CMi

Abstract: We determine the nature of the Delta Scuti star AD CMi and its physical parameters from newly determined times of maximum light and other times from the literature, as well as from uvby − β photoelectric photometry.

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The challenges of modelling the activities occurring on eclipsing binaries V1130 Cyg and V461 Lyr
E. Yoldaş H. A. Dal

Abstract: We present the findings for the magnetic activities seen on V1130 Cyg and V461 Lyr. In the case of V1130 Cyg, the secondary component’s temperature was found to be 3891±50 K, while the mass ratio was computed as 0.689±0.001, and the orbital inclination as 90◦

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Chromospheric activity nature of KIC 6044064
E. Yoldaş

Abstract: This study presents results obtained from the data of KIC 6044064 (KOI 6652). KIC 6044064 was observed by the Kepler Mission for a total of 1384.254 days. 525 minima times were determined, 264 of which were primary minima and the rest were secondary minima. T

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The first detailed analysis on the astrophysical properties of the eccentric binary V990 Her

Abstract: We present accurate physical parameters of the eccentric binary system V990 Her which has an orbital period of P = 8.193315±0.000003 days using its photometric and spectroscopic data. The physical parameters of the components were derived as Teff1= 8000±200K,

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Study of an Intermediate age open cluster IC 1434 using ground-based imaging and Gaia DR2 astrometry
Y. H. M. Hendy D. Bisht

Abstract: We present a detailed photometric and kinematical analysis of the poorly studied open cluster IC 1434 using CCD VRI, APASS, and Gaia DR2 database for the first time. By determining the membership probability of stars we identify the 238 most probable members

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Star formation histories of brightest cluster galaxies with intermediate central ages
J. Umanzor M. L. Talavera

Abstract: This work is devoted to the study of the star formation histories (SFHs) of the brightest cluster galaxies (BCGs) with intermediate central ages (from 5 to 10Gyr), to confirm if BCGs with these ages represent different accretion histories or simply a stochast

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Mass ratios of long-period binary stars resolved in precision astrometry catalogs of two epochs
Valeri V. Makarov

Abstract: Mass ratios of widely separated, long-period, resolved binary stars can be directly estimated from the available data in major space astrometry catalogs, such as the ESA’s Hipparcos and Gaia mission results. The method is based on the universal principle of i

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Stability analysis of relativistic polytropes

Abstract: We study the relativistic self-gravitating, hydrostatic spheres with a polytropic equation of state, considering structures with the polytropic indices n = 1(0.5)3 and illustrate the results for the relativistic parameters σ = 0 − 0.75. We determine the criti

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A study of the SX Phe star BL Cam

Abstract: We determined the physical parameters of the SX Phe star BL Cam from newly available times of maximum light and other times from the literature, as well as from uvby − β photoelectric photometry. From our analysis we found that this star is a binary system. T

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Interpretation of optical and IR light curves for transitional disk candidates in NGC 2264 using the extincted stellar radiation and the emission of optically thin dust inside the hole

Abstract: In the stellar forming region NGC 2264 there are objects catalogued as hosting a transitional disk according to spectrum modeling. Four members of this set have optical and infrared light curves coming from the CoRoT and Spitzer telescopes. In this work, we t

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A survey on extensions of the pure gravity swing-by maneuver

Abstract: The present paper surveys the more recent techniques related to the swing-by maneuver, where a spacecraft changes its energy and angular momentum by passing close to celestial bodies. It is focused on the literature related to extensions of this maneuver, wit

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