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Refined fundamental parameters of Canopus from combined near-IR interferometry and spectral energy distribution
Millour, F.; Zorec, J.; Domiciano de Souza, A. +3 more
Context. Canopus, the brightest and closest yellow supergiant to our Solar System, offers a unique laboratory for understanding the physics of evolved massive stars.
Aims: We aim at quantitatively exploring a large space of fundamental parameters of Canopus based on the combined analysis of its spectral energy distribution (SED) and optical-I…
Study of Galactic structure using UVIT/AstroSat star counts
Pradhan, Ananta C.; Ghosh, S. K.; Piridi, Sonika +3 more
The structure of our Galaxy has been studied from ultraviolet (UV) star counts obtained with the Ultra-Violet Imaging Telescope (UVIT) on board the AstroSat satellite, in Far-UV (FUV) and Near-UV (NUV) bands. The F154W (BaF2) and N263M (NUVB4) filters were used in the FUV and NUV bands, respectively. The point sources are separated from…
D Multi-Resolution Mapping of Mars Using Casp-Go on HRSC, Crism, Ctx and Hirise
Conway, S. J.; Tao, Y.; Muller, J. -P. +1 more
Automated large-scale retrieval of stereo photogrammetric DTMs of Mars fall into three categories: use of COTS software such as BAE-SOCET®; private software such as the DLR-VICAR software suite and open source solutions such as the NASA Ames Stereo Pipeline (ASP). We describe here a novel open source system developed on the back of ASP kno…
Exploiting night-time averaged spectra from PFS/MEX shortwave channel. Part 2: Near-surface CO retrievals
Vandaele, Ann Carine; Daerden, Frank; Nardi, Luca +7 more
Because of its important role in the Martian carbon cycle, carbon monoxide (CO) has been the subject of many measurements from ground and from space. Daytime measurements have been mostly exploited to measure the CO abundance because of their good signal-to-noise ratio, but night-time observations have not been documented yet. We demonstrate here …
Revisiting the X-ray emission of the asynchronous polar V1432 Aql
Qian, Sheng-Bang; Zhu, Li-Ying; Wang, Qi-Shan
As the only eclipsing asynchronous polar, V1432 Aql provides an excellent laboratory to study the interaction between the accreted matter and the magnetic field. Here, we report an analysis of the X-ray data from the contemporaneous NuSTAR and Swift-XRT observations. The X-ray data present a profile with a low-intensity state for almost half an or…
Signatures of large-scale cold fronts in the optically-selected merging cluster HSC J085024+001536
Oguri, Masamune; Fujimoto, Ryuichi; Okabe, Nobuhiro +5 more
We represent a joint X-ray, weak-lensing, and optical analysis of the optically-selected merging cluster, HSC J085024+001536, from the Subaru HSC-SSP survey. Both the member galaxy density and the weak-lensing mass map show that the cluster is composed of south-east and north-west components. The two-dimensional weak-lensing analysis shows that th…
Research on the HIP 18856 binary system
Mitrofanova, Arina; Dyachenko, Vladimir; Beskakotov, Anatoly +5 more
The results of a study on the binary HIP 18856 and construction of its orbit are presented. New observational data were obtained at the BTA of SAO RAS in 2007-2019. Earlier, Cvetković et al. constructed the orbit for this system. However, it is based on six measurements, which cover a small part of the orbit. The positional parameters of the ESA a…
L199, A new variable star in M13
Violat-Bordonau, F.
During a routine study of the variable stars of Messier 13 (NGC 6205 = Cl 1639+365) we have discovered the variability of L199 (TYC 2588-1386-2), a red giant star member of the cluster: using the photometric data - in V band - obtained in the 2019 and 2020 campaigns we have verified its variability. Data from the Zwicky Transient Facility (ZTF) an…
Observations of the Bright Star in the Globular Cluster 47 Tucanae (NGC 104)
Benjamin, R. A.; Dupree, A.; Miller Bertolami, M. M. +3 more
The Bright Star in the globular cluster 47 Tucanae (NGC 104) is a post-asymptotic giant branch (post-AGB) star of spectral type B8 III. The ultraviolet spectra of late-B stars exhibit myriad absorption features, many due to species unobservable from the ground. The Bright Star thus represents a unique window into the chemistry of 47 Tuc. We have a…
UBVRI observations of the flickering of the dwarf nova RX And
Zamanov, R. K.; Nikolov, G.; Georgieva, A. T.
We report observations of the flickering variability of the dwarf nova RX And in five bands (UBVRI) on two nights. On 25 October 2019 the brightness of the star was B≈ 13.8 mag, the amplitude of the flickering was 0.47 mag, and we estimate for the flickering source temperature Tfl = 10700 ± 400 K, and radius Rfl =0.046 ± 0.00…