IIA Institutional Repository: Recent submissions

  • Studies on Carbon-Enhanced Metal-Poor (CEMP) stars 
    Drisya, K (Indian Institute of Astrophysics, 2015-03)
    Chemical composition of metal-poor stars are crucial to develop an understanding of the nature of the earliest stars formed in the universe, the nucleosynthesis events associated with them, as well as, to redefine the ...
  • Scattering polarization with Paschen-Back effect as a tool to diagnose the magnetic structuring of the solar atmosphere 
    Sowmya, K (Indian Institute of Astrophysics, 2016-03)
    The Sun is a unique physical laboratory in which the various domains of physics inaccessible to laboratories on earth can be studied in great detail. Its proximity allows us to understand it in great depths. George Ellery ...
  • Exploration of the second solar spectrum through polarimetric studies 
    Supriya, H. D (Indian Institute of Astrophysics, 2016-03)
    The discovery of Zeeman effect opened a new window to observe the Sun. It enabled to understand the magnetic field which is one of the basic features that govern different physical processes on the Sun. These magnetic ...
  • Magnetoconvective flows and waves in the lower solar atmosphere 
    Sangeetha, C. R (Indian Institute of Astrophysics, 2017-01)
    Sun has complex magnetic features like sunspots, magnetic bright points, plages, network fields, filaments, etc. These complex magnetic features are found to be associated with various observed dynamical phenomenons like ...
  • On the coupling between lower and upper atmosphere of the Sun 
    Samanta, T (Indian Institute of Astrophysics, 2017-01)
    The thesis is focused on the study of the small-scale transients and waves as seen in the different layers of the solar atmosphere and the coupling between the different layers. The unique high resolution data obtained ...
  • Development of detectors for space missions and balloon flights 
    Ambily, S (Indian Institute of Astrophysics, 2018-11)
    We are developing compact astronomical payloads for ultraviolet (UV) observations from CubeSats and high altitude balloons. It is important to have a highly sensitive, low noise detector in the UV region where the ...
  • Abundance patterns of old open clusters as tracers of galactic chemical evolution 
    Reddy, A. B. S (Indian Institute of Astrophysics, 2014-06)
    We have initiated a program to explore the presence of chemical inhomogeneities in the Galactic disk using the open clusters (OCs) as ideal probes. We have obtained high S/N - ratio and high- dispersion echelle spectra ...
  • Study of stellar streams in the galaxy 
    Ramya, P (Indian Institute of Astrophysics, 2014-02)
    Our Galaxy, also called the Milky Way, is a spiral galaxy consisting of three major distinct components: bulge, disc and halo. They differ from each other in their structural as well as kinematical and chemical properties. ...
  • Study of sun-like G stars and their exoplanets 
    Gurumath, S. R (Vellore Institute of Technology and Indian Institute of Astrophysics, 2019-05)
    By employing exoplanetary physical and orbital characteristics, aim of this study is to understand the genesis, dynamics, chemical abundance and magnetic field structure of Sun-like G stars and relationship with their ...
  • Application of polarized line formation theory to the solar spectrum 
    Smitha, H. N (Indian Institute of Astrophysics, 2014-06)
    One of the primary causes for the occurrence of observed features on the Sun is its magnetic field. The traditional way of measuring the solar magnetic fields is through the Zeeman effect. Over the decades, as the precision ...
  • Study of lunar surface chemistry using swept charge devices 
    Athiray, P. S (Indian Institute of Astrophysics, 2015-05)
    The study of origin and evolution of the Moon have generated scientific curiosity for a long time. With the improved technology, with larger telescopes and better scientific instruments the lunar surface got revealed and ...
  • Precision controller for segmented mirror telescope actuator: control and tuning 
    Prasanna Deshmukh; Parihar, P. S (IEEE, 2016-03)
    The segmented mirror telescopes are built using small hexagonal mirrors positioned and aligned by the three actuators and six edge sensors per segment to maintain the shape of the primary mirror. The global loop controller ...
  • The Effect of Bulge Mass on Bar Pattern Speed in Disk Galaxies 
    Kataria, Sandeep Kumar; Mousumi Das (IOP Publishing, 2019-11)
    We present a study of the effect of bulge mass on the evolution of bar pattern speed in isolated disk galaxies using N -body simulations. Earlier studies have shown that disk stars at the inner resonances can transfer a ...
  • Concerning the Li-rich status of KIC 9821622: a Kepler field RGB star reported as a Li-rich giant 
    Raghubar Singh; Bharat Kumar, Y; Reddy, B. E; Aoki, W (Oxford University Press on behalf of the Royal Astronomical Society, 2020-01)
    Given the implications for the origin of Li enhancement in red giants, we have reviewed the Li-rich classification of KIC 9821622, the only bonafide red giant branch (RGB) giant with a He inert core to date, reported as a ...
  • Delving into the Historical Ca II K Archive from the Kodaikanal Observatory: The Potential of the Most Recent Digitized Series 
    Chatzistergos, Theodosios; Ermolli, Ilaria; Solanki, Sami K; Krivova, Natalie A; Banerjee, D; Jha, Bibhuti K; Chatterjee, Subhamoy (Springer, 2019-10)
    Full-disc Ca II K photographic observations of the Sun carry direct information as regards the evolution of solar-plage regions for more than a century and are therefore a unique dataset for solar-activity studies. For a ...
  • UVIT Open Cluster Study. II. Detection of Extremely Low Mass White Dwarfs and Post – Mass Transfer Binaries in M67 
    Jadhav, Vikrant V; Sindhu, N; Subramaniam, A (IOP Publishing, 2019-11)
    A detailed study of the UV-bright stars in the old open star cluster M67 is presented based on the far-UV observations using the Ultra Violet Imaging Telescope ( UVIT ) on ASTROSAT . The UV and UV – optical ...
  • The ALMaQUEST Survey: The Molecular Gas Main Sequence and the Origin of the Star-forming Main Sequence 
    Lin, Lihwai; Pan, Hsi-An; Ellison, Sara L; Belfiore, Francesco; Shi, Yong; Sánchez, Sebastián F; Hsieh, Bau-Ching; Rowlands, Kate; Ramya, S; Thorp, Mallory D; Li, Cheng; Maiolino, Roberto (IOP Publishing, 2019-10-20)
    The origin of the star-forming main sequence (SFMS; i.e., the relation between star formation rate and stellar mass, globally or on kpc scales) remains a hotly debated topic in galaxy evolution. Using the ALMA-MaNGA QUEnching ...
  • Solar polarization 7 
    Nagendra, K. N; Stenflo, J. O; Qu, Z. Q; Sampoorna, M (Astronomical Society of the Pacific, 2014-10)
    "This volume contains the proceedings of the 7th in a series of international solar polarization workshops that was initiated almost two decades ago. The aim of these workshops has been to explore the Sun and its magnetic ...
  • A catalogue of 108 extended planetary nebulae observed by GALEX 
    Pradhan, Ananta C; Panda, Swayamtrupta; Parthasarathy, M; Murthy, J; Ojha, Devendra K (Springer, 2019-10)
    We present the ultraviolet (UV) imaging observation of planetary nebulae (PNe) using archival data of Galaxy Evolution Explorer (GALEX). We found 358 PNe detected by GALEX in near-UV (NUV). We have compiled a catalogue of ...
  • GROWTH on S190425z: Searching Thousands of Square Degrees to Identify an Optical or Infrared Counterpart to a Binary Neutron Star Merger with the Zwicky Transient Facility and Palomar Gattini-IR 
    Coughlin, Michael W; Tomás Ahumada; Shreya Anand; Kishalay De; Hankins, Matthew J; Kasliwa, Mansi M; Singer, Leo P; Eric C. Bellm; Igor Andreoni; Bradley Cenko, S; Jeff Cooke; Copperwheat, Christopher M; Dugas, Alison M; Jencson, Jacob E; Perley, Daniel A; Po-Chieh Yu; Varun Bhalerao; Harsh Kumar; Bloom, Joshua S; Anupama, G. C; Ashley, Michael C. B; Ashot Bagdasaryan; Rahul Biswas; Buckley, David A. H; Burdge, Kevin B; Cook, David O; John Cromer; Virginia Cunningham; Antonino D ’ Aì; Dekany, Richard G; Alexandre Delacroix; Simone Dichiara; Duev, Dmitry A; Anirban Dutta; Michael Feeney; Sara Frederick; Pradip Gatkine; Shaon Ghosh; Goldstein, Daniel A; Zach Golkhou, V; Ariel Goobar; Graham, Matthew J; Hidekazu Hanayama; Takashi Horiuchi; Tiara Hung; Jha, Saurabh W; Kulkarni, Shrinivas R; Thomas Kupfer; Masci, Frank J; Paolo Mazzali; Moore, Anna M; Moses Mogotsi; Neill, James D; Chow-Choong Ngeow; Jorge Martínez-Palomera; Valentina La Parola; Pavana, M; Ofek, Eran O; Atharva Sunil Patil; Reed Riddle; Mickael Rigault; Ben Rusholme; Eugene Serabyn; Shupe, David L; Yashvi Sharma; Avinash Singh; Jesper Sollerman; Jamie Soon; Kai Staats; Kirsty Taggart; Hanjie Tan; Tony Travouillon; Eleonora Troja; Gaurav Waratkar; Yoichi Yatsu (IOP Publishing, 2019-11)
    The third observing run by LVC has brought the discovery of many compact binary coalescences. Following the detection of the fi rst binary neutron star merger in this run ( LIGO / Virgo S190425z ) , we performed ...

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