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Discovery of the variable optical counterpart of the redback pulsar PSR J2055+1545
Kennedy, Mark R.; Turchetta, Marco; Sen, Bidisha +5 more
We present the discovery of the variable optical counterpart to PSR J2055
A pristine view of galactic globular clusters and their peripheries: Omega Centauri
Kuzma, P. B.; Ishigaki, M. N.
The central regions of the globular cluster Omega Centauri (
Cataclysmic variables from Sloan Digital Sky Survey - V (2020-2023) identified using machine learning
Thorstensen, John R.; Anderson, Scott F.; Brownstein, Joel R. +16 more
SDSS-V is carrying out a dedicated survey for white dwarfs, single and in binaries, and we report the analysis of the spectroscopy of 504 cataclysmic variables (CVs) and CV candidates obtained during the first 34 months of observations of SDSS-V. We developed a convolutional neural network (CNN) to aid with the identification of CV candidates amon…
Vertical kinematics of the young Galactic clusters
Elmegreen, Bruce; Alfaro, Emilio J.; Sánchez-Gil, M. Carmen
The young disc vertical phase is paramount in our understanding of Galaxy evolution. Analysing the vertical kinematics at different Galactic regions provides important information about the space-time variations of the Galactic potential. The vertical phase snail shell structure identified in Gaia Data Release 2 includes a wide age range. However,…
A first glimpse at the MeerKAT DEEP2 field at S-band
Camilo, F.; Kramer, M.; Menten, K. +15 more
We present the first wide-field extragalactic continuum catalogue with the MeerKAT S-band (2.5 GHz), of the radio-selected DEEP2 field. The combined image over the S1 (1.96-2.84 GHz) and S4 (2.62-3.50 GHz) sub-bands has an angular resolution of 6.8 arcsec
Hemispheric asymmetry of coronal bright point's number and area over solar cycles 23-24
Karachik, Nina V.; Minenko, Ekaterina P.
Temporal variations in the number and area of coronal bright points (CBPs) were studied separately in the Northern and Southern hemispheres over more than two solar cycles (years 1996-2022). Hemispheric asymmetry was identified in both the total number and area of CBPs, with differences reaching up to 15 per cent. Statistical analysis using Studen…
Spectral analysis of ultraluminous X-ray pulsars with models of X-ray pulsars
Paul, Biswajit; Sharma, Rahul; Kumar, Manish +1 more
A fraction of the ultraluminous X-ray (ULX) sources are known to be accreting neutron stars as they show coherent X-ray pulsations with pulse periods ranging from
Exploring the empirical instability strip for γ Dor-type stars in eclipsing binaries
Çakırlı, Ö.; Bilir, S.; Özdarcan, O. +1 more
This research paper has light-curve modelling, spectroscopy, and detailed asteroseismic studies for five detached eclipsing binaries with a
A statistical and multiwavelength photometric approach to investigate a young embedded open star cluster: NGC 6193
Medhi, Biman J.; Sheikh, A. H.; Deka, Simanta
We present a statistical and multiwavelength photometric study of the young open cluster NGC 6193. To determine cluster membership, we used an unsupervised ensemble-based machine-learning approach and identified 246 cluster members with a search radius of 30 arcmin using
A search for close binary systems in the SALT survey of hydrogen-deficient stars using TESS
Dorsch, M.; Jeffery, C. S.; Snowdon, E. J. +1 more
The TESS periodograms of the SALT survey catalogue of hydrogen-deficient stars were searched for evidence of short-period variability. Periodic light-curve variations were identified in 16 stars out of 153 catalogue objects, of which 10 were false positives. From the remaining 6 identified variables, Ton S 415 is a known close binary system and th…