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Surviving Tidal Tails Around the Milky Way Bulge Globular Cluster NGC 6355
Piatti, Andrés E.
We present results of the analysis of a set of images obtained in the field of the Milky Way bulge globular cluster NGC 6355 using the Dark Energy Camera, which is attached to the 4 m Blanco telescope of the Cerro-Tololo Interamerican Observatory. We dealt with a heavy differential absorption across the observed field, a crowded field star populat…
The impact of improved estimates of radio star astrometric models on the alignment of the Gaia bright reference frame to ICRF3
Lestrade, Jean-François; Xu, Ming H.; Anderson, James M. +12 more
Aims. We investigated the residual orientation offset and spin between the bright (G ≤ 13 mag) frame of the Gaia Early Data Release 3 (Gaia EDR3) and the third realization of the International Celestial Reference Frame (ICRF3). For this purpose, six rotation parameters (orientation offset and its time derivative, the spin), as well as corrections …
Bayesian characterization of the young open cluster NGC 6383 using HDBSCAN and Gaia DR3
Pulgar-Escobar, L. M.; Henríquez-Salgado, N. A.
This study focuses on determining the characteristics of the young open cluster NGC 6383. To achieve this, the HDBSCAN clustering algorithm is utilized to identify potential cluster members based on proper motions and parallaxes from Gaia Data Release 3. Various parameters of NGC 6383, such as tidal radius, core radius, distance through parallax a…
JWST Imaging of Edge-on Protoplanetary Disks. III. Drastic Morphological Transformation Across the Mid-infrared in Oph163131
Duchêne, Gaspard; Wolff, Schuyler G.; Perrin, Marshall D. +6 more
We present JWST broadband images of the highly inclined protoplanetary disk SSTc2d J163131.2-242627 (Oph163131) from 2.0 to 21 µm. The images show a remarkable evolution in disk structure with wavelength, quite different from previous JWST observations of other edge-on disks. At 2.0 and 4.4 µm, Oph163131 shows two scattering surfaces s…
X-Ray Spectroscopy of the Dwarf Nova Z Chamaeleontis in Quiescence and Outburst Using the XMM-Newton Observatory
Drake, Jeremy J.; Balman, Şölen; Godon, Patrick +1 more
We present X-ray spectroscopy of the SU UMa–type dwarf nova Z Chamaeleontis using the European Photon Imaging Camera and reflection grating spectrometer (RGS) instruments on board the XMM-Newton observatory. The quiescent system can be modeled by collisional equilibrium (CIE) or nonequilibrium plasma models, yielding a kT of 8.2–13.0 keV at a lumi…
Search for Stellar Companions of Exoplanet Host Stars with AstraLux/CAHA 2.2 m
Mugrauer, Markus; Buder, Sven; Ginski, Christian +3 more
Stellar multiplicity is a key aspect of exoplanet diversity, as the presence of more than one star in a planetary system can have both devastating and positive effects on its formation and evolution. In this paper, we present the results of a Lucky Imaging survey of 212 exoplanet host stars performed with AstraLux at the 2.2 m telescope of the Cen…
Star formation history of the post-collisional Cartwheel galaxy using AstroSat/UVIT FUV images
Gómez-González, V. M. A.; Mayya, Y. D.; Barway, Sudhanshu +1 more
We present the results obtained by analysing the new AstroSat Ultra-Violet Imaging Telescope (UVIT) far-ultraviolet (FUV) image of the collisional-ring galaxy Cartwheel. The FUV emission is principally associated with the star-forming outer ring, with no ultraviolet detection from the nucleus and inner ring. A few sources are detected in the regio…
Chandra X-ray analysis of Herbig Ae/Be stars
Mathew, Blesson; Manoj, P.; Kartha, Sreeja S. +4 more
Herbig Ae/Be (HAeBe) stars are intermediate-mass pre-main-sequence stars, characterized by infrared (IR) excess and emission lines. They are observed to emit X-rays, whose origin is a matter of discussion and not settled yet. X-ray emission is not expected in HAeBe stars, as they lack the subsurface convective zone. In this study, we retrieved obs…
TV Mon - post-mass transfer Algol-type binary with δ Scuti pulsations in primary component
Han, Zhanwen; Kovalev, Mikhail; Chen, Xuefei +4 more
We present a study of the detached eclipsing binary TV Mon using spectra from the LAMOST (Large Sky Area Multi-Object Fiber Spectroscopic Telescope) medium-resolution survey, ASAS-SN (All Sky Automated Survey for SuperNovae), and CoRoT (Convection, Rotation and planetary Transits) photometry. We apply multiple-epochs spectral fitting to derive rad…
A Spectroscopic and Interferometric Study of W Serpentis Stars. I. Circumbinary Outflow in the Interacting Binary W Serpentis
Gies, Douglas R.; Shepard, Katherine; Monnier, John D. +6 more
W Serpentis is an eclipsing binary system and the prototype of the Serpentid class of variable stars. These are interacting binaries experiencing intense mass transfer and mass loss. However, the identities and properties of both stars in W Ser remain a mystery. Here, we present an observational analysis of high-quality, visible-band spectroscopy …