IIA Institutional Repository: Recent submissions

  • Measurements of seeing-induced crosstalk in tip–tilt corrected solar polarimetry 
    Mathur, Harsh; Nagaraju, K; Pruthvi, Hemanth; Sagayanathan, K (Optica Publishing Group, 2024-05-20)
    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 ...
  • Effect of aspect ratio on the x-ray attenuation of nanoparticles: A theoretical study 
    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 ...
  • Comparison between variations in solar UV radiation and sunspot parameters with Mg II daily index as a proxy 
    Chandrika, G; Ravindra, B; Doddamani, Vijay Kumar (Elsevier B.V, 2024-05)
    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 ...
  • Distribution and recovery phase of geomagnetic storms during solar cycles 23 and 24 
    Mishra, Wageesh; Sahani, Preity Sukla; Khuntia, Soumyaranjan; Chakrabarty, Dibyendu (Oxford University Press on behalf of Royal Astronomical Society, 2024-05)
    Coronal mass ejections (CMEs) and Stream Interaction Regions (SIRs) are the main drivers of intense geomagnetic storms. We study the distribution of geomagnetic storms associated with different drivers during solar cycles ...
  • A comparative study of star-forming dwarf galaxies using the UVIT 
    Amrutha, S; Mousumi Das; Yadav, Jyoti (Oxford University Press on behalf of Royal Astronomical Society, 2024-05)
    We present a far-ultraviolet (FUV) study of 16 star-forming dwarf galaxies (SFDGs) using the Ultra Violet Imaging Telescope. Morphologically, SFDGs are classified as dwarf spirals, dwarf irregulars, and blue compact dwarfs ...
  • Analysis of BMR Tilt from AutoTAB Catalog: Hinting toward the Thin Flux Tube Model? 
    Sreedevi, Anu; Jha, Bibhuti K; Karak, Bidya Binay; Banerjee, D (American Astronomical Society, 2024-05-01)
    One of the intriguing mechanisms of the Sun is the formation of bipolar magnetic regions (BMRs) in the solar convection zone (CZ), which are observed as regions of concentrated magnetic fields of opposite polarity on ...
  • Mining the GALAH Data. I. Study of Five Super Lithium-rich Metal-poor Giants 
    Susmitha, A; Mallick, Anohita; Reddy, B. E (American Astronomical Society, 2024-05-01)
    The presence of a large amount of Li in giants is still a mystery. Most of the super Li-rich (SLR) giants reported in recent studies are in the solar metallicity regime. Here, we study the five metal-poor SLRs from the ...
  • Multiwavelength Observations of Multiple Eruptions of the Recurrent Nova M31N 2008-12a 
    Basu, Judhajeet; Pavana, M; Anupama, G. C; Barway, Sudhanshu; Singh, Kulinder Pal; Swain, Vishwajeet; Srivastav, Shubham; Kumar, Harsh; Bhalerao, Varun; Sonith, L. S; Selvakumar, G (American Astronomical Society, 2024-05-01)
    We report the optical, UV, and soft X-ray observations of the 2017–2022 eruptions of the recurrent nova M31N 2008-12a. We find a cusp feature in the r¢- and i¢-band light curves close to the peak, which could be related ...
  • Exploring NGC 2345: A Comprehensive Study of a Young Open Cluster through Photometric and Kinematic Analysis 
    Belwal, Kuldeep; Bisht, D; Bisht, Mohit Singh; Rangwal, Geeta; Raj, Ashish; Dattatrey, Arvind K; Yadav, R. K. S; Bhatt, B. C (American Astronomical Society, 2024-05-01)
    We conducted a photometric and kinematic analysis of the young open cluster NGC 2345 using CCD UBV data from 2 m Himalayan Chandra Telescope, Gaia Data Release 3, Two Micron All-Sky Survey, and the Photometric All-Sky ...
  • 125 Years Under the Sun: A Chronicle of the Kodaikanal Solar Observatory 
    Rajaguru, S. P; Ravindra, B (Indian Institute of Astrophysics, 2024-04)
  • Resource Information and Management on Hydra 
    Parwage, Anish (Indian Institute of Astrophysics, 2015)
    TORQUE-3.0.2 with Maui-3.3.1 is used as Resource Manager for HYDRA and performs job scheduling in cluster environment. It looks into the resource requirement for a job and provides the requested resources for the job to ...
  • A stellar photo-polarimeter 
    Raveendran, A. V; Srinivasulu, G; Muneer, S; Mekkaden, M. V; Jayavel, N; Somashekar, M. R; Sagayanathan, K; Ramamoorthy, S; Rosario, M. J; Jayakumar, K (Indian Institute of Astrophysics, 2015)
    A new astronomical photo-polarimeter that can measure linear polarization of point sources simultaneously in three spectral bands was designed and built in the Institute. The polarimeter has a Calcite beam-displacement ...
  • Solar Soft X-ray Irradiance Variability III: Magnetic Field Variations of Coronal X-ray Features 
    Kariyappa, R; Adithya, H. N; Masuda, Satoshi; Kusano, Kanya; Imada, Shinsuke; Zender, Joe; Dame, Luc; DeLuca, Edward; Weber, Mark; Matsumoto, Takuma (Springer Nature B.V., 2024-04)
    The magnetic field changes the radiative output of the Sun and is the main source for all the solar surface features. To study the role of the underlying photospheric magnetic field in relation to emission features observed ...
  • Spectroscopic Investigation of Nebular Gas (SING): instrument design, assembly and calibration 
    Bharat Chandra, P; Binukumar, G; Shubham Jankiram, Ghatul; Jain, Shubhangi; Sriram, S; Mahesh Babu, S; Mohan, Rekhesh; Safonova, M; Murthy, J; Sachkov, Mikhail (Springer Nature, 2024-06)
    The Spectroscopic Investigation of Nebular Gas (SING) is a near-ultraviolet (NUV) low-resolution spectrograph payload designed to operate in the NUV range, 1400 Å – 2700 Å, from a stable space platform. SING telescope ...
  • Minkowski functionals for composite smooth random fields 
    Pravabati, C; Fazlu, Rahman (American Physical Society, 2024-04-15)
    Minkowski functionals quantify the morphology of smooth random fields. They are widely used to probe statistical properties of cosmological fields. Analytic formulas for ensemble expectations of Minkowski functionals are ...
  • Indigenous Development Software for the 90” Mirror coating plant, VBO 
    Arumugam, V (Indian Institute of Astrophysics, 2024-05-29)
    A Telescope is an instrument that aids in the observation of stellar and celestial objects. Mirrors are an important subsystem in the Telescope. Over a period, due to weathering effects, reflection efficiency of the mirrors ...
  • NTP Server and Weather Monitor for Kodaikanal Solar Observatory 
    Anand, M. N (Indian Institute of Astrophysics, 2024-05-29)
    We perceive time as a passage of events, a marker of change. In astronomy and astrophysics, we study events occurring over a short time (order of seconds) to long-term (a few years) variability. Accurate time stamping is ...
  • Forty Hypervelocity Stars from Gaia DR3 
    Parthasarathy, M (American Astronomical Society, 2024-04)
    Forty hypervelocity stars (HVS) are detected from a search for HVS in Gaia DR3 data whose G magnitudes are less than 17.0 and radial velocities are more +400 km s‑1. The Gaia DR3 astrophysical parameters and spectra indicate ...
  • A Selection of 23 Bright Hypervelocity Gaia DR3 Stars 
    Parthasarathy, M (American Astronomical Society, 2024-03)
    From the Gaia DR3 data twenty three bright hypervelocity stars that have Tycho catalogue numbers are presented. All these stars are of high galactic latitude and some may be galactic halo stars. All of them have accurate ...
  • A chemodynamical analysis of bright metal-poor stars from the HESP-GOMPA survey – indications of a non-prevailing site for light r-process elements 
    Bandyopadhyay, A; Beers, Timothy C; Ezzeddine, Rana; Sivarani, T; Nayak, Prasanta K; Pandey, Jeewan C; Saraf, Pallavi; Susmitha, A (Oxford University Press on behalf of Royal Astronomical Society, 2024-04)
    We present a comprehensive analysis of the detailed chemical abundances for a sample of 11 metal-poor, very metal-poor, and extremely metal-poor stars ([Fe/H] = −1.65 to [Fe/H] = −3.0) as part of the HESP-GOMPA (Galactic ...

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