Search Publications
Open clusters identifying by multi-scale density feature learning
Wang, Min; Shao, Zhengyi; Xiang, Yaobing +2 more
Open clusters (OCs) are important objects in exploring the structure and history of the Milky Way. Large amount of sky survey data can be used to detect OCs. However, analyzing these data manually has become a bottleneck of OC identification. This study proposes a multi-scale density feature learning (MSDFL), which includes the open cluster kernel…
Analysis of the Open Cluster NGC 2281
Terrell, Dirk; Gross, John; Cooney, Walter R., Jr.
B V observations of an approximately 68 ' × 48 ' field centered on the open cluster NGC 2281 and covering more than 400 nights from 2013 to 2018 are presented. The photometric observations were transformed to the standard system using standards from the American Association of Variable Star Observers Photometric All-sky Survey (APASS) DR10 and ana…
Spectroscopic Variability of the Compact Planetary Nebula Hb 12
Arkhipova, V. P.; Esipov, V. F.; Ikonnikova, N. P. +5 more
We present the results of our new low-resolution spectroscopic observations of the young compact planetary nebula Hb 12 performed in 2011-2020 with SAI MSU telescopes. We have measured the intensities of more than 50 nebular emission lines in the spectral range $λ$3687-9532, detected interstellar absorption features, and conducted a search for abs…
Multiwavelength search for and studies of active galaxies
Mickaelian, A. M.; Abrahamyan, H. V.; Paronyan, G. M. +4 more
We present surveys and related studies of active galaxies carried out at the NAS RA V.Ambartsumian Byurakan Astrophysical Observatory (BAO). This has been one of the main research subjects at BAO for many years since the mid-1950s, when Viktor Ambartsumian suggested the hypothesis of the activity of the galactic nuclei. A number of surveys of and …
Solar Wind Interaction with Earths Bow Shock
Lin, Naiguo; Lee, Ensang; Liu, Ying +3 more
Ionized gas kinematics of cluster AGN at z 0.8 with KMOS
Rosati, Piero; Nantais, Julie; Demarco, Ricardo +6 more
We present an integral field spectroscopy study of two active galactic nuclei (AGN) in the galaxy cluster RXJ0152-137 at z = 0.84. We have combined integrated and 3D spectra with HST images to perform a complete morpho-kinematical analysis of each galaxy. For G557, we detect narrow and broad H α and [N II] emission. The broad H α component is reds…
KIC 4762887: A near-contact binary or an ellipsoidal variable star?
Liu, Liang; Li, Xu-Zhi
KIC 4762887 is a variable star with a very small amplitude discovered by Kepler and show the EW-type light curve. We analyzed the light curve of KIC 4762887 by using the 2015 version of the Wilson-Devinney code. The results indicated that it is not a contact binary, maybe not even an eclipsing binary. We also modelled the light curve by the Fourie…
Confirmation of seven faint ATLAS variable star candidates
Thomas, N.; Guan, C.
A pilot survey conducted at the Lookout Observatory has confirmed seven faint (V ~ 13 to 17) variables in the region of Kepler-76b that were recently discovered by the Asteroid Terrestrial-Impact Last Alert System (ATLAS). The ATLAS survey identified 315,000 probably variables within its wide-field survey in 2018. The faintness (down to r ~ 18) an…
Jovian electrons at the Earth orbit and stationary structures in the solar wind
Kecskeméty, K.; Daibog, E. I.; Logachev, Yu I.
This work studies the influence of the structure of inner heliospheric magnetic field on the propagation of Jovian electrons from Jupiter to the Earth orbit. Beginning from 1974, 13-month variations of relativistic Jovian electron fluxes were recorded by spacecraft near the Earth. 22 synodic cycles are analysed. The best connection in each cycle w…
Exploiting night-time averaged spectra from PFS/MEX shortwave channel. Part 1: Temperature retrieval from the CO2ν3 band
Vandaele, Ann Carine; Daerden, Frank; Nardi, Luca +7 more
Nadir remote sensing of the night side of Mars is challenging, mainly due to the low signal-to-noise ratio of such observations. We show in a companion paper that the abundance of carbon monoxide (CO) during night can be retrieved from the observations of the Planetary Fourier Spectrometer (PFS). This requires, however, an accurate knowledge of th…