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On the impact of central obscuration on the effectiveness of ground-based O/IR telescopes
A. V. Hakobyan

Abstract: Annular apertures are typical in modern reflective telescopes. They exhibit altered shapes of PSF and OTF if compared with perfect circular ones. As a consequence the optical power of such a telescope is also changed. This can be calculated with the use of cl

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Optical polarization study in the centaurus region: NGC 5662

Abstract: We present (BV RI) multicolor linear polarimetric data of 73 of the brightest stars in the open cluster NGC 5662. Our objective is to study the characteristics of the interstellar medium (ISM) towards it and in its the environment. NGC 5662 is polarimetricall

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Estimation of the star formation rate using Long-Gamma ray bursts observed by swift
M. Elías O. M. Martínez

Abstract: In this work we estimate the star formation rate (SFR) through 333 LongGRBs detected by Swift. This investigation is based on the empirical model proposed by Yüksel et al. (2008). Basically, the SFR is estimated using long-GRBs considering that they have a st

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Numerical simulation of the HH 30 astrophysical jet near its launch site

Abstract: We simulate the surface brightness of the HH 30 astrophysical jet near its launch site in the forbidden O I, N II, and S II doublets by post-processing gas dynamical simulations of densities and temperatures, using spectral line emission data from the astroph

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Variable stars in NGC 4147 revisited: RR Lirae stars new CCD VI photometry and physical parameters

Abstract: We have calculated the physical parameters of the RR Lyrae stars in the globular cluster NGC 4147 via the Fourier decomposition of their light curves, using new data and well-established semi-empirical calibrations and zero points. The mean metallicity and di

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AGB Candidates in the field of γ CAS1

Abstract: We report the spectroscopic and photometric monitoring of a sample of 530 candidate AGB stars in a 5 × 5 degrees field, selected from the IPHAS catalog; historic light curves were derived from Asiago IR plates taken in the years 1965 -1984. We found 10 Miras,

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𝛅 mus revisited1: Rectifying a 82 yr-old mistake
Dimitri Pourbaix Henri M. J. Boffin

Abstract: The red giant δ Muscae is known since 1919 to be a spectroscopic binary, and the first and only orbit was determined in 1936, claiming the period to be 847 days. This was discrepant with the Hipparcos determined astrometric orbit. Using the latest data availa

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Exact traveling wave solutions of KDV equation for daws in superthermal plasma
U. M. Abdelsalam M. S. Zobaer

Abstract: A propagation of fully nonlinear dust-acoustic waves (DAWs) in superthermal plasma is investigated. The plasma is described by the hydrodynamic dust fluid equations with superthermal electrons and ions, where both follow a kappa distribution. The reductive pe

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Kinematics of the galactic bubble RCW 120

Abstract: We studied the kinematics of the Galactic bubble RCW120 in the SIIλλ6717,6731 Å lines. We measured a LSR radial velocity ranging from ≈ −74 to ≈ −6 km s−1. We found evidence of expansion only in the northeast region of the nebula (from 20 to 30 km s−1). We fo

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On the orbital period of the cataclysmic variable V767 CYG

Abstract: We present a photometric and spectroscopic study that helps to constrain the orbital period of the system V767 Cyg for the first time. From the analysis of the V filter light curve besides of that for the radial velocity curve for different Balmer series line

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Determination of stellar atmospheric parameters for a sample of post-AGB stars
R. E. Molina

Abstract: We report for the first time the stellar atmospheric parameters for a a set of post-AGB stars classified by Suárez et al. (2006). The stellar spectra were obtained in the optical region, with low-resolution and have different spectral ranges. We select a samp

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KIMYA, a code for solving chemical reaction networks in astrophysics

Abstract: KIMYA is a new code for solving the system of differential equations describing the temporal behavior of a chemical network. This paper presents a simple and easy to implement numerical method and tests of its accuracy. KIMYA was designed for incorporating a

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A windswept cloud core adjacent to HH 2

Abstract: We analyze an Hα image of the HH 1/2 region of unprecedented depth. In this image, the outflows and other emission structures of this region are clearly seen. We focus on a description of the “hill’, which is an approximately circular feature directly to the

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Studying MID-Range planar orbits around Phobos

Abstract: The goal of the present paper is to search and study mid-range planar orbits for a spacecraft traveling near Phobos. The first step is to make a numerical search and classification of natural orbits based in the concept of “Quasi Satellite Orbits” (QSO). The

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The HI and H2-to-stellar mass correlations of late-and early-type galaxies and their consistency with the observational mass functions

Abstract: We compile and homogenize local galaxy samples with available information on morphology, and stellar, HI and/or H2 masses. After taking into account non gas detections, we determine the HIand H2-to-stellar mass relations and their 1σ scatter for lateand early

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Studying direct and indirect effects of impulses in powered aero-gravity-assist maneuvers around Venus

Abstract: The study of aero-gravity-assisted maneuvers around Venus is the focus of the present paper. These are maneuvers that combine the passage by the gravity field of the planet with an impulsive maneuver that is applied at the moment of the closest approach aroun

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