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Deeply comprehensive astrometric, photometric, and kinematic studies of the three OCSN open clusters with Gaia DR3
Elsanhoury, W. H.; Çınar, D. C.; Haroon, A. A. +1 more
In this study, we considered the optical wavelength of Gaia Data Release 3 (DR3) to analyze poorly studied three newly open star clusters, namely OCSN 203, OCSN 213, and OCSN 244 clusters with ASTECA code. Here, we identified 227, 200, and 551 candidates with highly probable (
High-resolution spectroscopy of the variable hot post-AGB star LS 4331 (IRAS 17381‑1616)
Hubrig, Swetlana; Parthasarathy, Mudumba; Sarkar, Geetanjali +2 more
An analysis of the high-resolution (
A summary of instruments proposed for observing pulsating variables from the Mt. Abu Observatory
Ganesh, Shashikiran; Prajapati, Prachi; Mishra, Anwesh Kumar +3 more
Pulsating variables play a significant role in shaping modern astronomy. Presently it is an exciting era in observational study of variable stars owing to surveys like OGLE and TESS. The vast number of sources being discovered by these surveys is also creating opportunities for 1–2-m class telescopes to provide follow-up observations to characteri…
Stellar substructures in the Galactic disc and halo: Properties, origins, and evolution
Deepak
Spatial, kinematic, and orbital properties, along with ages and chemical compositions of the thin disc, thick disc, and various stellar substructures in the halo, are studied based on data from the LAMOST and Gaia surveys. The star formation in the Galactic thin and thick disc, with peak metallicities of ‑ 0.20 and ‑ 0.45 dex, is found to have pea…
Luminosity dependent cyclotron line in Swift J1626.6‑5156
Paul, Biswajit; Tobrej, Mohammed; Rai, Binay +3 more
We studied the timing and spectral properties of the Be/X-ray pulsar Swift J1626.6‑5156 using the NICER observations of its 2021 outburst. The most important observation is the positive correlation of the centroid energy of the fundamental cyclotron line with the luminosity. This observation agrees with the usual positive correlation of the centro…
Markov Chain Monte Carlo optimization applied to double stars from Miller & Pitman research
Budding, Edwin; Rhodes, Michael D.; Banks, Timothy +1 more
Model orbits have been fitted to 27 physical double stars listed in a 1922 catalog. A Markov Chain Monte Carlo technique was applied to estimate best-fitting values and associated uncertainties for the orbital parameters. Dynamical masses were calculated using parallaxes from the Hipparcos mission and are presented in this paper with the estimates…
Searching for wide binary stars with non-coeval components in the northern sky
Malkov, Oleg; Kniazev, Alexey; Gorda, Stanislav
We have spectroscopically studied the last six stars in the northern sky from our preliminary list of candidates for wide non-coeval pairs, and we have found no evidence of non-coevality. Thus, considering our previous research, which found one such binary system, we confirm that our preliminary estimate of the fraction of binaries in the solar ne…
Possibilities of identifying members from Milky Way satellite galaxies using unsupervised machine learning algorithms
Sivarani, Thirupathi; Divakar, Devika K.; Doddamani, Vijayakumar H. +1 more
A detailed study of stellar populations in Milky Way (MW) satellite galaxies remains an observational challenge due to their faintness and fewer spectroscopically confirmed member stars. We use unsupervised machine learning methods to identify new members for nine nearby MW satellite galaxies using Gaia data release-3 (Gaia DR3) astrometry, the Da…
Protoplanetary disks around young stellar and substellar objects in the σ
Paul, K. T.; Jose, Jessy; Damian, Belinda +1 more
Understanding the evolution and dissipation of protoplanetary disks are crucial in star and planet formation studies. We report the protoplanetary disk population in the nearby young
Star-forming site RAFGL 5085: Is a perfect candidate of hub-filament system?
Dewangan, L. K.; Pandey, Rakesh; Sharma, Saurabh +4 more
To investigate the star-formation process, we present a multi-wavelength study of a massive star-forming site RAFGL 5085, which has been associated with the molecular outflow, HII region and near-infrared cluster. The continuum images at 12, 250, 350 and 500