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First photometric investigation of two short-period eclipsing binaries ASAS J105115-6032.1 and GDS J1056047-604149
Sarotsakulchai, Thawicharat; Soonthornthum, Boonrucksar; Liu, Nian-Ping +1 more
ASAS J105115-6032.1 (hereafter ASAS J1051) and GDS J1056047-604149 (hereafter GDS J1056) are two short-period contact binaries close to each other in the Antarctica sky area. By analyzing the light curves from AST3-1, the first photometric solutions are presented using the Wilson-Devinney (W-D) method. It is detected that both systems are W-type c…
Hot white dwarf candidates from the IGAPS-GALEX cross-match
Raddi, R.; Sabin, L.; Gómez-Muñoz, M. A. +1 more
White dwarf (WD) stars are often associated with the central stars of planetary nebulae (CSPNe) on their way to the cooling track. A large number of WD star candidates have been identified; thanks to optical large-scale surveys such as Gaia DR2 and EDR3. However, hot-WD/CSPNe stars are quite elusive in optical bands due to their high temperatures …
Abundances of disk and bulge giants from high-resolution optical spectra. V. Molybdenum: The p-process element
Ryde, N.; Rich, R. M.; Jönsson, H. +2 more
Aims: In this work, we aim to make a differential comparison of the neutron-capture and p-process element molybdenum (Mo) in the stellar populations in the local disk(s) and the bulge, focusing on minimising possible systematic effects in the analysis.
Methods: The stellar sample consists of 45 bulge and 291 local disk K-giants observed …
Simulation of Water Vapor Photodissociation during Dust Storm Season on Mars
Medvedev, A. S.; Rodin, A. V.; Shaposhnikov, D. S.
Within the framework of this work, using a three-dimensional numerical model of the general circulation of the Martian atmosphere MAOAM (Martian Atmosphere: Observation and Modeling), also known as MPI-MGCM (Max Planck Institute Martian General Circulation Model), we simulated the planet's hydrological cycle during the 28 and 34 Martian years (MY2…
Improvements to Pan-STARRS1 Astrometry. II. Corrections for Differential Chromatic Refraction
White, Richard L.; Shiao, Bernie; Lubow, Stephen H.
In a previous paper, we applied the Gaia DR2 catalog to improve the astrometric accuracy of about 1.7 billion objects in Pan-STARRS1 Data Release 2 (PS1 DR2). We report here on further improvements made by utilizing Gaia EDR3 and correcting for the effects of differential chromatic refraction (DCR) in decl. We extend the correction algorithm in Pa…
Detection of a Superluminous Spiral Galaxy in the Heart of a Massive Galaxy Cluster
Lovisari, Lorenzo; Ogle, Patrick; Jones, Christine +5 more
It is well established that brightest cluster galaxies (BCGs), residing in the centers of galaxy clusters, are typically massive and quenched galaxies with cD or elliptical morphology. An optical survey suggested that an exotic galaxy population, superluminous spiral and lenticular galaxies, could be the BCGs of some galaxy clusters. Because the c…
Suzaku observations of Fe K-shell lines in the supernova remnant W 51 C and hard X-ray sources in the proximity
Fujita, Yutaka; Nobukawa, Masayoshi; Nobukawa, Kumiko K. +2 more
In this paper, we investigate the Fe K-shell lines in the supernova remnant W 51 C and hard X-ray sources in the proximity. We measure the intensities of the Fe I Kα and Fe XXV Heα lines at 6.40 and 6.68 keV, respectively, and find that the intensity of the 6.68 keV line is consistent with the background level expected from previous studies, while…
Recent Formation of a Spiral Disk Hosting Progenitor Globular Clusters at the Center of the Perseus Brightest Cluster Galaxy. I. Spiral Disk
Ohyama, Youichi; Lim, Jeremy; Yeung, Michael C. H.
We address the nature and origin of a spiral disk at the center of NGC 1275, the giant elliptical galaxy at the center of the Perseus cluster, that spans a radius of ~5 kpc. By comparing stellar absorption lines measured in long-slit optical spectra with synthetic spectra for single stellar populations, we find that fitting of these lines requires…
An investigation into the spectral parameters of ultra-low-frequency (ULF) waves in the polar caps and magnetotail
Nosikova, Nataliya Sergeevna; Yagova, Nadezda Viktorovna; Baddeley, Lisa Jane +2 more
The present case study is focused on fluctuations at ∼ 1.5 mHz observed on open field lines in both of the polar caps in ground-based geomagnetic data and in the electron concentration in the Northern Hemisphere ionosphere. Coherent pulsations with a relatively narrow narrowband-like spectra and a higher fraction of transversal components in the t…
Estimation of the Mass of the Very Massive Galaxy Cluster SRGe CL2305.2-2248 from Strong Lensing
Bikmaev, I. F.; Gilfanov, M. R.; Khamitov, I. M. +10 more
SRGe CL2305.2-2248 (SPT-CL J2305-2248, ACT-CL J2305.1-2248) is one of the most massive galaxy clusters at high redshifts ($z∼eq 0.76$) and is of great interest for cosmology. Deep images have been obtained at the Russian-Turkish 1.5-m telescope (RTT-150) for an optical identification of this cluster. In combination with the open Hubble Space Teles…