Search Publications

Analysis of photometric and spectroscopic variability of red supergiant Betelgeuse

Jadlovský, Daniel; Krtička, Jiří; Paunzen, Ernst +1 more

Betelgeuse is a pulsating red supergiant whose brightness is semi periodically variable and in February 2020 reached a historical minimum, the Great Dimming. The aims of this study are to characterize Betelgeuse's variability based on available archival data and to study possible causes of light variability. Many spectra, from ultraviolet and opti…

A constrained cosmological model in f(R ,L_m) gravity

Singh, J. K.; Shaily; Myrzakulov, Ratbay +1 more

In this article, we study the expanding nature of the universe in the context of f(R ,L_m) gravity theory, here R represents the Ricci scalar and L_m is the matter Lagrangian density. With a specific form of f(R ,L_m) , we obtain the field equations for flat FLRW metric. We parametrize the deceleration parameter in te…

Possible merger signatures of the bulges of non-dwarf galaxies in the core of the Coma Cluster

Hasan, S. N.; Poloji, Nagamani; Hasan, Priya

In this paper, we discuss a method to study virialised clusters of galaxies with no-interaction features, like tails and bridges, using diagnostics of bulge classification and their properties, namely Sérsic index (n) and the Kormendy relation. We study a sample of non-dwarf galaxies in the core of the Coma Cluster using HST/ACS data. We divided o…