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Multicolor Photometry and Peculiarities of the Spectrum for the post-AGB Candidate AU Vulpeculae (IRAS 20160+2734)
Esipov, V. F.; Ikonnikova, N. P.; Tatarnikov, A. M. +7 more
We present the results of a UBVRcIc and JHKLM photometric monitoring campaign conducted in 2016-2020, low-resolution spectroscopy, and an analysis of the ASAS-3 and ASAS-SN photometric data for the semiregular variable and post-AGB candidate AU Vul (IRAS 20160+2734). The star is shown to experience quasi-periodic brightness oscillations with a var…
Orbits and Individual Masses of Some Visual Binaries
Elsanhoury, W. H.; Elkholy, E. A.; Nouh, M. I.
The orbits of visual binary systems still attract the interest of many working groups in astronomy. These orbits are the most important and reliable sources of stellar masses. In the present paper, we computed the orbits and dynamical masses of some visual binaries using an independent code. We used the Kowalsky method to compute the geometrical e…
BVRcIc Observations, Third-body Orbital Study, and Analysis of the UV Leo-type, Pre-W UMA Binary V642 Virginis
Zasche, Petr; Wolf, Marek; Kučáková, Hana +6 more
V642 Vir is a polar spotted, well-detached, UV Leo-type, low-mass, pre-WUMa (T1 ∼ 4250K, ∼K6V) eclipsing binary. It was observed in 2020 April, May, and June at the Dark Sky Observatory in North Carolina, USA with the 0.81 m reflector of Appalachian State University. A total of 88 timings were used in our 22-year period study which included 12 Tra…
MLS120126:042313+212951—A New Eclipsing Cataclysmic Variable in the Period Gap
Kolbin, A. I.; Aitov, V. N.; Kotov, S. S. +2 more
We have analyzed our photometric and spectroscopic observations of the new eclipsing cataclysmic variable MLS120126:042313+212951. We have found the system's orbital period $P=0.1034329$ day (${≈}2.48$ h) corresponding to the gap $2\lesssim P\lesssim 3$ h in the distribution of cataclysmic variables. A Doppler tomogram in the H$β$ line demonstrate…
On the origin of runaway binaries: the case of the HMXB 4U 2206+54/BD +53 2790
Neuhäuser, R.; Mugrauer, M.; Stoyanov, K. A. +7 more
We present most probable place and time of the origin of the runaway high-mass X-ray binary 4U 2206+54 based on its Gaia EDR3 astrometric parameters and our new systemic radial velocity. We studied the trace back motion of the system and propose that it originated in the subgroup of the Cepheus OB1 association (Age~4-10 Myr) with its brightest sta…
Impactite dykes in impact crater central uplifts: Insights from Negril crater, Mars
Tornabene, Livio L.; Osinski, Gordon R.; Pilles, Eric A.
Negril crater is a 52 km complex crater located north of Syrtis Major, Mars. The central uplift of Negril crater is remarkably well-exposed and contains one of the best examples of dykes associated with a Martian crater. This study aims to characterize the dykes within the central uplift and determine if they are impactite dykes that formed as a p…
Orbits of Visual Double Stars from P. Couteau's Catalogue Determined with Gaia DR2 and Gaia EDR3 Data
Kisser, A. E.; Krechet, V. G.
The orbits of ten stars discovered by P. Couteau have been determined for the first time: COU 99, 357, 610, 850, 1346, 1531, 1642, 1752, 1845, and 2459. For two of them (COU 850 and 1752) an arc of more than half a revolution is covered by observations; the orbits of the remaining stars have been determined from short arcs ($5^{\circ}{-}50^{\circ}…
Photometric Determination of the Distance to the RR Lyrae Star YZ Capricorni
Lester, J.; Joignant, R.; Meier, M.
The RR Lyrae YZ Cap was observed using photometric methods to determine its pulsation period and distance. Light curves in the Bessell B and V and SDSS i' and z' filters were used to determine the period, which was found to be 0.274 ± 0.003 day. The distances calculated using a luminosity-metallicity (V filter) and period-luminosity-metallicity re…
Chronos - take the pulse of our galactic neighbourhood
Famaey, Benoit; Katz, David; Haywood, Misha +15 more
Understanding our Galaxy's structure, formation, and evolution will, over the next decades, continue to benefit from the wonderful large survey by Gaia, for astrometric, kinematic, and spectroscopic characterization, and by large spectroscopic surveys for chemical characterization. The weak link for full exploitation of these data is age character…
Investigating the Physical Properties and Fragmentation of the AFGL 333-Ridge
Wang, Jun-Jie; Xu, Jin-Long; Liang, Xiaolian
We present multiwavelength data to investigate the physical properties and fragmentation of AFGL 333-Ridge. A statistical analysis of velocity dispersion indicates that turbulence is the dominant motion in the ridge. However, the linear mass density (1124.0 M ⊙/pc) of AFGL 333-Ridge far exceeds its critical value of 406.5 M ⊙…