Search Publications
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
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…
U B V I
Akkaya Oralhan, İnci
Fundamental astrophysical parameters have been derived for Berkeley 55 (Be 55) open cluster based on the UBVI charge-coupled device (CCD) photometric data observed using a AZT-22 1.5 m telescope at Maidanak Astronomical Observatory (MAO) in Uzbekistan. The mean reddening is obtained as
Observations of bright stars with AstroSat soft X-ray telescope
Singh, K. P.; Dewangan, G. C.; Bhattacharyya, S. +5 more
We present observations of four bright stars observed with the AstroSat Soft X-ray Telescope (SXT). Visible light from bright stars like these can leak through the very thin filter in front of the CCD in the focal plane CCD camera of the SXT and thus making the extraction of X-ray events difficult. Here, we show how to extract the X-ray events wit…
UOCS. V. UV study of the old open cluster NGC 188 using AstroSat
Sahu, Snehalata; Subramaniam, Annapurni; Pandey, Sindhu +3 more
We present the UV photometry of the old open cluster NGC188 obtained using images acquired with Ultraviolet Imaging Telescope (UVIT) on board the AstroSat satellite, in two far-UV (FUV) and one near-UV (NUV) filters. UVIT data is utilised in combination with optical photometric data to construct the optical and UV colour-magnitude diagrams (CMDs).…
Observations of AR Sco with Chandra and AstroSat soft X-ray telescope
Singh, K. P.; Buckley, D. A. H.; Rana, V. +6 more
We present our AstroSat soft X-ray observations of a compact binary system, AR Sco, and analysis of its X-ray observations with Chandra that were taken only about a week before the AstroSat observations. An analysis of the soft X-ray (0.3–2.0 keV) data limits the modulation of the spin, orbital, or beat periods to less than 0.03 counts s
Study of Galactic structure using UVIT/AstroSat star counts
Pradhan, Ananta C.; Ghosh, S. K.; Piridi, Sonika +3 more
The structure of our Galaxy has been studied from ultraviolet (UV) star counts obtained with the Ultra-Violet Imaging Telescope (UVIT) on board the AstroSat satellite, in Far-UV (FUV) and Near-UV (NUV) bands. The F154W (BaF2) and N263M (NUVB4) filters were used in the FUV and NUV bands, respectively. The point sources are separated from…
UVIT observation of Milky Way satellite galaxy Reticulum II
Thirupathi, Sivarani; Divakar, Devika K.; Doddamani, Vijayakumar H.
We present the UV photometry of one of the Ultra-Faint Dwarf (UFD) Milky Way (MW) satellite galaxies, Reticulum II, using images acquired with the Ultra-Violet Imaging Telescope (UVIT) onboard AstroSat. Reticulum II is a dark matter dominated, one of the most metal-poor and old (13.5 Gyr) satellite galaxies. High resolution spectroscopy of red gia…