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Quasar catalogue for the astrometric calibration of the forthcoming ILMT survey
Mathew, Blesson; Stalin, C. S.; Surdej, Jean +3 more
Quasars are ideal targets to use for astrometric calibration of large scale astronomical surveys as they have negligible proper motion and parallax. The forthcoming 4-m International Liquid Mirror Telescope (ILMT) will survey the sky that covers a width of about 27
The horizontal branch morphology of the globular cluster NGC 1261 using AstroSat
Rao, N. Kameswara; Subramaniam, Annapurni; Rani, Sharmila +2 more
We present the results obtained from the UV photometry of the globular cluster NGC 1261 using far-UV (FUV) and near-UV (NUV) images acquired with the Ultraviolet Imaging Telescope (UVIT) on-board the AstroSat satellite. We utilized the UVIT data combined with HST, GAIA, and ground-based optical photometric data to construct the different UV colour…
Characteristics of SEPs during solar cycles 21–24
Kumar, Raj; Pande, Bimal; Pande, Seema +1 more
The study of the solar energetic particle events (SEPs) and their association with solar flares and other activities are very crucial to understand the space weather. Keeping this in view, here we present the study of SEPs (intensity
A search for variable stars in the four open star clusters
Bisht, D.; Rangwal, Geeta; Yadav, R. K. S. +3 more
We present a CCD photometric survey for the search of variable stars in four open clusters namely Berkeley 69, King 5, King 7 and Berkeley 20. The time series observations were carried out for 1 and/or 2 nights for each of the clusters in the year 1998, which have led to identify nineteen variable stars in these clusters. Out of these 19 variable …
[Rb/Zr] ratio in Ba stars as a diagnostic of the companion AGB stellar mass
Shejeelammal, J.; Goswami, Aruna
Understanding nucleosynthesis in and evolution of asymptotic giant branch (AGB) stars is of primary importance as these stars are the main producers of some of the key elements in the Universe. They are the predominant sites for slow-neutron-capture nucleosynthesis (s-process). The exact physical conditions and nucleosynthetic processes occurring …
Gamma-ray emitting narrow-line Seyfert 1 galaxies: Past, present, and future
Paliya, Vaidehi S.
This article reviews our current understanding about
CCD U B V ( R I ) KC
Oralhan, İnci Akkaya; Michel, Raúl; Karataş, Yüksel +3 more
The open clusters NGC 2323 and NGC 2539 have been analysed using CCD
Relation between solar flares and halo coronal mass ejections
Sankarasubramanian, K.; Rao, V. Koteswara; Gopal, K. Rama +2 more
Solar flares and coronal mass ejections (CMEs) are two very important active events from Sun. Inspite of several theoretical and statistical analyses, the relation between solar flares and CMEs is so far not well established, and strong opinions and arguments still continue. Statistical approaches use a lot of data available from many measurements…
Identifying Li-rich giants from low-resolution spectroscopic survey
Zhao, Gang; Kumar, Yerra Bharat; Reddy, Bacham Eswar
In this paper we discuss our choice of a large unbiased sample used for the survey of red giant branch stars for finding Li-rich K giants, and the method used for identifying Li-rich candidates using low-resolution spectra. The sample has 2000 giants within a mass range of 0.8 to
Stellar parameters of the two binary systems: HIP 14075 and HIP 14230
Al-Wardat, Mashhoor A.; Pathan, J. M.; Masda, Suhail G.
We present the stellar parameters of the individual components of the two old close binary systems HIP 14075 and HIP 14230 using synthetic photometric analysis. These parameters are accurately calculated based on the best match between the synthetic photometric results within three different photometric systems with the observed photometry of the …