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Optical design of Coatli: A diffraction-limited visible imager with fast guiding and active optics correction

Abstract: We present the optical design of COATLI, a two channel visible imager for a comercial 50 cm robotic telescope. COATLI will deliver diffraction-limited images (approximately 0.3 arcsec FWHM) in the riz bands, inside a 4.2 arcmin field, and seeing limited image

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The variable star population in the globular cluster NGC 6934

Abstract: We report an analysis of new V and I CCD time-series photometry of the globular cluster NGC 6934. Through the Fourier decomposition of the RR Lyrae light curves the mean values of Fe/H and the distance of the cluster were estimated; we found: Fe/HUV ES=−1.48±

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KIC 9451096: Magnetic activity, flares and differential rotation
O. Özdarcan E. Yoldaş H. A. Dal

Abstract: We present a spectroscopic and photometric analysis of KIC9451096. The combined spectroscopic and photometric modelling shows that the system is a detached eclipsing binary in a circular orbit and composed of F5V + K2V components. Subtracting the best-fitting

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A comparison of the radio and optical time-evolution of HH 1 and 2

Abstract: We present a comparison between the time-evolution over the past ≈ 20 years of the radio continuum and Hα emission of HH 1 and 2. We find that the radio continuum and the Hα emission of both objects show very similar trends, with HH 1 becoming fainter and HH

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Testing the planet-metallicity correlation in M-Dwarfs with gemini gnirs spectra

Abstract: While the planet-metallicity correlation for FGK main-sequence stars hosting giant planets is well established, it is less clear for M-dwarf stars. We determine stellar parameters and metallicities for 16 M-dwarf stars, 11 of which host planets, with near-inf

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A study of the long term behavior of the SX PHE star KZ HYA1

Abstract: From the newly determined times of maximum light of the SX Phe star KZ Hya and others from the literature, as well as from uvby − β photoelectric photometry, we determined the nature of this star and its physical parameters.

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Emission line galaxies behind the planetary nebula IC 5148: Potential for a serendipity survey with archival data

Abstract: During the start of a survey program using FORS2 long slit spectroscopy on planetary nebulae (PN) and their haloes, we serendipitously discovered six background emission line galaxies (ELG) with redshifts of z = 0.2057, 0.3137, 0.37281, 0.4939, 0.7424 and 0.8

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A numerical-analytical approach based on canonical transformations for computing optimal low-thrust transfers

Abstract: A numerical-analytical procedure based on infinitesimal canonical transformations is developed for computing optimal time-fixed low-thrust limited power transfers (no rendezvous) between coplanar orbits with small eccentricities in an inverse-square force fie

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Unveiling the hot molecular core in the ultracompact H II region with extended emission G12.21-0.10

Abstract: We present a multiwavelength study of the cometary H II region G12.21-0.10 using the VLA and OVRO. Both radio continuum (0.3, 0.7, 2 and 3.6 cm) and spectral lines of H41α, 13CS(2−1) & (1−0), and NH3(2,2) & (4,4) observations are included. We find two 3 mm co

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Retrograde and direct powered aero-gravity-assist trajectories around Mars

Abstract: A Gravity-Assist maneuver is used to reduce fuel consumption and/or trip times in interplanetary missions. It is based in a close approach of a spacecraft to a celestial body. Missions like Voyager and Ulysses used this concept. The present paper performs a s

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A new orbit for comet C/1865 B1 (Great southern comet of 1865)
Richard L. Branham Jr.

Abstract: Comet C/1865 B1 (Great southern comet of 1865), observed only in the southern hemisphere, is one of a large number of comets with parabolic orbits. Given that there are 202 observations in right ascension and 165 in declination it proves possible to calculat

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Incompressible wind accretion
Emilio Tejeda

Abstract: We present a simple, analytic model of an incompressible fluid accreting onto a moving gravitating object. This solution allows us to probe the highly subsonic regime of wind accretion. Moreover, it corresponds to the Newtonian limit of a previously known re

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In situ orbit extraction from live, high precision collisions simulations of systems formed by cold collapse
H. Noriega-Mendoza L. A. Aguilar

Abstract: We performed high precision, N -body simulations of the cold collapse of initially spherical, collisionless systems using the gyrfalcon code of Dehnen (2000). The collapses produce very prolate spheroidal configurations. After the collapse, the systems are si

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The time-dependent wavelet spectrum of HH 1 and 2

Abstract: We have calculated the wavelet spectra of four epochs (spanning ≈ 20 yr) of Hα and S II HST images of HH 1 and 2. From these spectra we calculated the distribution functions of the (angular) radii of the emission structures. We found that the size distributio

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High astrometric precision in the calculation of the coordinates of orbiters in the GEO ring

Abstract: We present an astrometric method for the calculation of the positions of orbiters in the GEO ring with a high precision, through a rigorous astrometric treatment of observations with a 1-m class telescope, which are part of the CIDA survey of the GEO ring. We

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SDSS IV - Manga properties of AGN Host Galaxies

Abstract: We present the characterization of the main properties of a sample of 98 AGN host galaxies, both type-II and type-I, in comparison with those of ≈2700 non-active galaxies observed by the MaNGA survey. We found that AGN hosts are morphologically early-type or

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Is HH 47 Slowing down?

Abstract: We have used three epochs of red S II and Hα Hubble Space Telescope (HST) archival images of HH 47 to determine the proper motion velocities of the knots along the jet. With the three available epochs we compute two sets of proper motions (one using the first

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Evolution of extragalactic radio sources and quasar/Galaxy unification

Abstract: We use a large sample of radio sources to investigate the effects of evolution, luminosity selection and radio source orientation in explaining the apparent deviation of observed angular size redshift (θ−z) relation of extragalactic radio sources (EGRSs) from

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