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Fundamental parameters of barium and CH stars from asteroseismic analysis: HD 33409, HD 20084 and HD 66812
Goswami, Aruna; Sonamben, Mayani
Asteroseismic analysis of stars using space mission data, such as the transiting exoplanet survey satellite (TESS) allows us to derive accurate fundamental parameters of stars. Barium and CH stars are believed to be in binary systems with a now invisible white dwarf companion. Knowledge of accurate fundamental parameters of these stars is essentia…
Pulsars in AstroSat-CZTI: detection in sub-MeV bands and estimation of spectral index from hardness ratios
Bhalerao, Varun; Bhattacharya, Dipankar; Anumarlapudi, Akash +1 more
The Cadmium Zinc Telluride Imager (CZTI) onboard AstroSat, an open detector above
Mass function of understudied open clusters NGC 2254 and Mayer 2
Kowshik, Krishna Kumar; Sujatha, S.; Komala, S. +1 more
The results of the CCD photometric UBVRI observations of the open clusters NGC 2254 and Mayer 2 are presented in this article. These clusters were observed using the 2-metre Himalayan Chandra Telescope at Hanle, India. NGC 2254 is located in the direction of Monoceros constellation at a distance of 2.57 ± 0.2 kpc and Mayer 2 is located in the dire…
Hard X-ray polarimetry—an overview of the method, science drivers, and recent findings
Chattopadhyay, Tanmoy
The last decade has seen a leapfrog in the interest of X-ray polarimetry with a number of new polarization measurements in hard X-rays from AstroSat, POLAR, GAP, and PoGO+. The measurements provide some interesting insights into various astrophysical phenomena such as coronal geometry and disk–jet connection in black hole X-ray binaries, hard X-ra…
UOCS. IV. Discovery of diverse hot companions to blue stragglers in the old open cluster King 2
Jadhav, Vikrant V.; Subramaniam, Annapurni; Pandey, Sindhu +1 more
King 2, one of the oldest clusters in the Milky Way, with an age of
The central region of the enigmatic Malin 1
Saha, Kanak; Barway, Sudhanshu; Dhiwar, Suraj +2 more
Malin 1, being a class of giant low surface galaxies, continues to surprise us even today. The HST/F814W observation has shown that the central region of Malin 1 is more like a normal SB0/a galaxy, while the rest of the disk has the characteristic of a low surface brightness system. The AstroSat/UVIT observations suggest scattered recent star form…
Characteristics of the open star cluster Kronberger 60 using Gaia DR2
Tadross, A. L.; Hendy, Y. H.
The estimation of the main parameters of star clusters is a very important target in astrophysical studies. Many of the open clusters listed in known catalogs have insufficient astrometric parameters. Improving the observations and analysis methods proved that some of them are asterisms and not true clusters. The most important aspect of using the…
UVIT study of UV bright stars in the globular cluster NGC 4147
Pradhan, Ananta C.; Mohapatra, Abhisek; Kumar, Ranjan +4 more
We present far ultraviolet (FUV) observations of globular cluster NGC 4147 using three FUV filters, BaF
Photometric and kinematical analysis of Koposov 12 and Koposov 43 open clusters
Elsanhoury, W. H.
We present a photometric and kinematical analysis of two poorly studied open clusters, Koposov 12 (FSR 802) and Koposov 43 (FSR 848), by using cross-matched data from PPMXL and Gaia DR2 catalogs. We used astrometric parameters to identify 285 and 310 cluster members for Koposov 12 and Koposov 43, respectively. Using the extracted member candidates…
Science with the AstroSat Soft X-ray telescope: An overview
Dewangan, Gulab C.; Singh, Kulinder Pal; Bhattacharyya, Sudip +6 more
The Soft X-ray Telescope (SXT) aboard the AstroSat satellite is the first Indian X-ray telescope in space. It is a modest size X-ray telescope with a charge coupled device (CCD) camera in the focal plane, which provides X-ray images in the