Search Publications
Berkeley 76: An intermediate age open star cluster in Gaia Era
Bisht, D.; Rangwal, Geeta; Raj, A. +3 more
We studied the open star cluster Berkeley 76 using Gaia DR3 and 2MASS data sets. We obtained 314 most probable cluster members with a membership probability greater than 80%. We have found the cluster center as α = 106.67 ± 0.07 deg and δ=‑11.75±0.07 deg. The mean PMs of cluster members in right ascension and declination are ‑0.60±0.22 and 1.35 ± …
Evidence of a sub-solar star in a microlensing event toward the LMC
Nucita, A. A.; De Paolis, F.; Franco, A. +1 more
Gravitational microlensing is known to be an impressive tool for searching dark, small, and compact objects that are missed by the usual astronomical observations. In this paper, by analysing multiple images acquired by DECam, we present the detection and a complete description of the microlensing event LMC J05074558-65574990 which is most likely …
The first light curve analysis of twin binary system V1175 Cas using ground-based and TESS data
Alan, Neslihan
Eclipsing binary systems hold a central position within astrophysics in that the fundamental parameters of stars can be determined by direct observations. The simultaneous analyses of high-quality space observations, combined with ground-based photometric data, have allowed more sensitive detection of fundamental stellar parameters by multicolor p…
Asteroseismology of evolved stars in six star clusters observed by Kepler/K2
Chang, Heon-Young; Jo, Yun-A.
In this study, we have explored the frequency separations,
Pulsational and eclipsing nature of TIC 140736015
Gürol, B.; Zhou, A. -Y.
We present the discovery of
XMM-Newton's view of a RS CVn binary CF Tuc
Sriram, K.; Agrawal, Vivek K.; Lahiri, Deblina +1 more
Coronal emission exhibited by the chromospherically active binaries is important to understand the underlying mechanism. We report the X-ray spectral studies of an RS CVn source CF Tuc using XMM-Newton archival data. The light curve was found to be steady with no flaring activity and the source was in a quiescent X-ray emission state. The source s…
X-ray reprocessing: Through the eclipse spectra of low mass X-ray binaries with XMM-Newton
Paul, Biswajit; Aftab, Nafisa
Eclipsing X-ray binaries make an ideal condition to study reprocessed X-rays, as the X-rays detected during eclipse are purely reprocessed while the much brighter primary X-rays are blocked by the companion star. We carried out a comprehensive study of X-ray reprocessing with four eclipsing Low Mass X-ray Binary (LMXB) systems by comparing X-ray s…
Spectral study of the planetary nebula NGC 2452
Ali, A.; Snaid, S.; Alruhaili, A.
We provide a detailed study for the Galactic planetary nebula (PN) NGC 2452, which has long been suspected to be a member of the Galactic cluster NGC 2453. The present study uses integral field unit (IFU) spectroscopic observations of the PN to explore its physical conditions, chemical abundances, kinematical characteristics, and morphological fea…
Multi-wavelength photometric study of five contact binaries in the field of globular cluster M4
Brosch, Noah; Jagirdar, Rukmini; Devarapalli, Shanti Priya +4 more
Binary stars are believed to be key determinants in understanding globular cluster evolution. In this paper, we present the Multi-band photometric analyses of five variables in the nearest galactic globular cluster M4, from the observations of CASE, M4 Core Project with HST for four variables (V48, V49, V51, and V55) and the data collected from T4…
A and F spectral type runaway star candidates in the 30 Doradus region
Gebrehiwot, Yikdem Mengesha; Teklehaimanot, Berhe Tewelde
The relative proper motions of eight A-F type runaway candidate stars, from the eleven cataloged stars by Platais et al. (2018) in the 30 Doradus (30 Dor) region of the Large Magellanic Cloud (LMC), are investigated using Gaia DR3 data. We cross-matched the coordinates presented by the authors with Gaia DR3 coordinates, and we took only eight star…