Since the dawn of the new millennium, there has been a revived interest in the concept of extra dimensions. In this scenario all the standard model matter and gauge fields are confined to the 4 dimensions and only gravity can escape to higher dimensions of the universe. This idea can be tested using table-top experiments, collider experiments, astrophysical or cosmological observations. The mai...

Context. It is debated whether the Milky Way bulge has the characteristics of a classical bulge sooner than those of a pseudobulge. Detailed abundance studies of bulge stars is a key to investigate the origin, history, and classification of the bulge. These studies can give constraints on the star-formation history, initial mass-function, and trace differences in stellar populations. Not many s...

Aluminum and other metal abundances were determined in 21 red giants in the globular clusters NGC 6752 and M80 as part of a larger study to determine whether the aluminum distribution on the red giant branch is related to the second parameter effect that causes clusters of similar metallicity to display different horizontal branch morphologies. The observations were obtained of the Al I lines n...

Five fields located close to the center of the globular cluster NGC 104=47 Tuc were surveyed in a search for variable stars. We present V -band light curves for 42 variables. This sample includes 13 RR Lyr stars – 12 of them belong to the Small Magellanic Cloud (SMC) and 1 is a background object from the galactic halo. Twelve eclipsing binaries were identified – 9 contact systems and 3 detached...

We present a study on the detailed elemental abundances of newly identified bright very metal-poor stars with detection lithium, initially observed as part SDSS/MARVELS pre-survey. These were selected for high-resolution spectroscopic follow-up HESP-GOMPA survey. In this work, we discuss Li detected several in survey, which include main-sequence stars, subgiants, and red giants. Different class...

The NASA Kepler mission is designed to find planets through transits. Accurate and precise radii of the detected planets depend on knowing the radius of the host star accurately, which is difficult unless the temperature and luminosity of the star are known precisely. Kepler, however, has an asteroseismology programme that will provide seismic variables that can characterise stellar radii easil...

Some fine structures can nowadays be identified in the high-quality colour-magnitude diagrams (CMD) of Local Group galaxies. The clump of red giants, for instance, may present a significant colour spread, and extensions to both brighter and fainter luminosities. Such features are predicted by population synthesis models which consider stars in the complete relevant ranges of ages and metallicit...

Abstract We present the kinematic and chemical profiles of red giant stars observed by Apache Point Observatory Galactic Evolution Experiment (APOGEE)-2 survey in direction Jhelum stellar stream, a Milky Way substructure located inner halo at distance from Sun ≈13 kpc. From six APOGEE-2 pointings, we isolate with log( g ) < 3.5, leaving sample 289 stars. this giants, identified seven that ar...