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KR Persei, a Mid-F Eclipsing Binary with a One-day Period
Fekel, Francis C.; Muterspaugh, Matthew W.; Sowell, James R. +5 more
KR Per is a partially eclipsing binary with an orbital period of 0.9960798 days, very close to one sidereal day, making it difficult to obtain extensive phase coverage in a reasonable amount of time. We used the Wilson-Devinney program to determine its orbital elements and stellar absolute dimensions from recently acquired radial velocities and di…
Comparison of photometric results between the Serbian and Bulgarian telescopes and activities in line with Gaia Alerts (Gaia-FUN-TO)
Damljanović, Goran; Cvetković, Zorica; Pavlović, Rade +5 more
We established the cooperation "Serbian-Bulgarian mini-network telescopes" in 2013, as well as two SANU-BAN joint research projects ("Observations of ICRF radio-sources visible in optical domain" during 2014-2016, and "Study of ICRF radio-sources and fast variable astronomical objects" for the period 2017-2019). Here, some main results of that coo…
Gaia DR3 and Some Results of Serbian-Bulgarian Cooperation
Damljanović, Goran
The Faint Optical Counterparts Catalog at 19.4 < r < 22 mag from Herschel-ATLAS SDP Field
Wu, Hong; Zhu, Yi-Nan; Zhou, Zhi-Min +2 more
We carry out a spectroscopic survey with Hectospec mounted on the 6.5 m Multiple Mirror Telescope to obtain redshifts of optical counterparts of the Herschel-ATLAS sources in the science demonstration phase field. Our work concerns counterparts with a magnitude range at $19.4\lt {r}_{\mathrm{SDSS}}\lt 22$ mag. The observation covers two $\sim 1\ {…
Neural network based identification of energy conversion regions and bursty bulk flows in Cluster data
Marghitu, Octav; Constantinescu, Vlad
Neural networks (NN) provide a powerful pattern recognition tool, that can be used to search large amounts of data for certain types of 'events'. Our specific goal is to make use of NN in order to identify events in time series, in particular energy conversion regions (ECRs) and bursty bulk flows (BBFs) observed by the Cluster spacecraft in the ma…
HD 121620: A Previously Unreported Variable Star with Unusual Properties
Axelsen, R. A.
During a study of the delta Scuti star V1393 Centauri by digital single lens reflex photometry, it was found that two of the chosen comparison stars were variable. This paper reports the subsequent investigation of one of them, HD 121620, which revealed irregular light variations of 0.8 magnitude in V within a time frame of approximately 24 hours.…
Pinnacles on the surface of the comet 67P/Churyumov-Gerasimenko: regional distribution and morphology
Keller, H. U.; Hviid, S. F.; Mall, U. +3 more
Pinnacles are local topographic promontories of different shapes considered to be formed due to uneven surface erosion. In the case of comets, areal changes in the degree of erosion could be related to inhomogeneities of the nucleus. However, the amount of the solar radiation and the thermal gradient is different across the orbit for geomorphologi…
Analysis of HAT-P-23 b, Qatar-1 b, WASP-2 b, and WASP-33 b with an Optimized EXOplanet Transit Interpretation Code (Abstract)
Nair, S.; Varghese, J.; Tock, K. +1 more
(Abstract only) The ability for citizen scientists to analyze image data and search for exoplanets using images from small telescopes has the potential to greatly accelerate the search for exoplanets. Recent work on the Exoplanet Transit Interpretation Code (EXOTIC) enables the generation of high-quality light curves of exoplanet transits given su…
Simple model of the wave pattern in the atmosphere of a slow rotating planet due to surface irregularities
Vigh, Carlos; Cirilo-Lombardo, Diego; Mayochi, Mariano +1 more
Recent observations show a persistent pattern on Venus surface, interpreted as a stationary wave due to the interaction of the prevailing winds with the orography of the planet. In this work we use an idealized model of the phenomenon that allows for a fully analytical solution applied to a slow rotating planet with idealized obstacles. We use Ven…
On possibility using photometry of Landolt fields for determination of stellar parameters and interstellar reddening
Pakhomov, Yu. V.; Stepina, Yu. A.
The paper analyzes the possibility of determination of stellar parameters and interstellar reddening based on UBVRIJHK photometry of secondary standards of the Landolt field S98. It is shown that the accuracy of photometric measurements should be 0.010 - 0.015 m or better and, at least 0.02 m , if a measured parallax is available.