We present ionization structures of IC 2003, a planetary nebula with [WR] central star, using a 1-D dusty photo-ionization code: ”CLOUDY 17.03”. The photo-ionization model is constrained by archival UV emission line fluxes, ...
Gaia EDR3 and Gaia DR3 data of selected stars in the very young (1.5-million-year-old) open cluster NGC 6530 are presented. All the selected stars have very accurate Gaia DR3 distances. Most of the selected stars are very ...
First-time airglow observations of the nighttime thermospheric wind from an in-house developed
ground-based Fabry–Perot Interferometer are recorded from the Kolhapur location of India. This was
the first attempt to build ...
Dhanush, S. R; Subramaniam, A; Subramanian, S(American Astronomical Society, 2024-06-20)
The internal kinematics of the Large Magellanic Cloud (LMC) disk have been modeled by several studies using
different tracers with varying coverage, resulting in a range of parameters. Here, we model the LMC disk using
1705 ...
Archana Soam; Eswaraiah, Chakali; Seta, Amit; Dewangan, Lokesh; Maheswar, G(Indian Academy of Sciences, 2024-06)
Molecular clouds are prime locations to study the process of star formation. These clouds contain
filamentary structures and cores, which are crucial sites for the formation of young stars. The star-formation
process has ...
There is growing evidence from stellar kinematics and galactic chemical evolution suggesting that giant planets
(MP 0.3MJ) are relatively young compared to the most commonly occurring population of small planets
(MP < ...
We present the science case for the proposed Daksha high energy transients mission.
Daksha will comprise of two satellites covering the entire sky from 1 keV to > 1 MeV.
The primary objectives of the mission are to ...
Sebastian, Biny; Caproni, Anderson; Kharb, Preeti; Nayana, A. J; Ali, Arshi; Rubinur, K; O Dea, Christopher P; Baum, Stefi; Nandi, Sumana(Oxford University Press on behalf of Royal Astronomical Society, 2024-06)
Identifying methods to discover dual active galactic nucleus (AGN) has proven to be challenging. Several indirect tracers have been explored in the literature, including X/S-shaped radio morphologies and double-peaked (DP) ...
Differential rotation is one of the basic characteristics of the Sun, and it plays an important role in generating the
magnetic fields and its activities. We investigated rotation rate using chromospheric features such ...
Bane Kshitij, Suhas Trupti; Barve, Indrajit V; Gireesh, G. V. S; Kathiravan, C; Ramesh, R(American Astronomical Society, 2024-06)
Recently we had reported commissioning of a prototype for pulsar observations at low radio frequencies
(<100 MHz) using log-periodic dipole antennas in the Gauribidanur Radio Observatory (≈77°E, 14°N) near
Bangalore in ...
We explore the impact of interactions between coronal mass ejections (CMEs) – known as CME–CME interactions – on Earth using remote-sensing and in situ observations and estimate the amplification of the geo-effectiveness ...
Geomagnetic storms are severe aspects of Space Weather. They originate due to solar transient emissions such as coronal mass ejections (CMEs), whose energetic materials propagate in the Interplanetary medium and are coupled ...
Mandal, Amit Kumar; Woo, Jong-Hak; Wang, Shu; Rakshit, Suvendu; Cho, Hojin; Son, Donghoon; Stalin, C. S(2024-06-20)
We investigate the torus size–luminosity relation of Type 1 active galactic nuclei (AGNs) based on the reverberation-mapping analysis using the light curves of the optical continuum and the IR continuum obtained with the ...
Decayless kink oscillations are omnipresent in the solar atmosphere, and they are a viable candidate for coronal heating. Although there have been extensive studies of decayless oscillations in coronal loops with lengths ...
We present an optical photometric and spectroscopic analysis of the fast-declining hydrogen-rich Type II supernova (SN) 2019nyk.
The light curve properties of SN 2019nyk align well with those of other fast-declining Type ...
Das, Soham; Rao, Nanditha; Phanindra, D. V. S; Sridharan, R(Indian Academy of Sciences, 2024-06)
The cross-correlation of two-dimensional digital images is fundamental to solar adaptive optics
computations. It can be used in a simple tip-tilt correction system to identify the relative shift between consecutive images ...
Aravind, K; Venkataramani, Kumar; Ganesh, Shashikiran; Surya, Arun; Sivarani, T; Sahu, D. K; Unni, Athira; Bhardwaj, Anil(Oxford University Press on behalf of Royal Astronomical Society, 2024-05)
Observing the vibrational/rotational lines in a comet’s optical spectrum requires high-resolution spectroscopy, as they are
otherwise seen as a blended feature. To achieve this, we have obtained medium and high-resolution ...
We present measurements of seeing-induced crosstalk using spectropolarimetric observations of sunspots recorded simultaneously in the H α and Ca II 8662 Å lines with the Kodaikanal Tower Tunnel (KTT) telescope. The Kodaikanal ...
Haghighi, R. R; Chatterjee, S; Zarei, F; Jafari, A; Vani, V. C; Pishdad, P; Moshiri, Samira; Akondi, V(Elsevier, 2024-05)
Purpose: There has been a significant focus on the potential applications of nanoparticle suspensions in the past few decades particularly as targeted contrast agents for specific pathological conditions. However, the ...
Solar UV radiation influence the Earth’s climate and upper atmosphere. The UV emission from the Sun modulates with the sunspot cycle with an 11-year periodicity. The variations in UV, EUV, and X-rays emission are significant ...