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Browsing IIAP Publications by Title

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  • REST: A Java Package for Crafting Realistic Cosmic Dust Particles 
    Halder, Prithish (IOP Publishing, 2022-11)
    The overall understanding of cosmic dust particles is mainly inferred from the different Earth-based measurements of interplanetary dust particles and space missions such as Giotto, Stardust, and Rosetta. The results from ...
  • Results from a revisit to the K2V bright points 
    Sivaraman, K. R; Gupta, S. S; Livingston, W. C; Damé, L; Kalkofen, W; Keller, C. U; Smartt, R; Hasan, S. S (European Southern Observatory, 2000-11)
    We have used pairs of temporally simultaneous CaII K-line spectroheliograms and magnetic area scans to search for spatial correlation between the CaII K2V bright points in the interior of the network and corresponding ...
  • Results from a spectroscopic survey in the CoRoT fields. I. Search for chromospherically active stars 
    Medhi, B. J; Messina, S; Parihar, P. S; Pagano, I; Muneer, S; Duorah, K (EDP Sciences, 2007-07)
    Aims.In this paper we report the results of the spectroscopic survey we carried out to detect chromospheric activity of late-type stars in the fields of view of the CoRoT space mission. Methods.We give an accurate MK ...
  • Results from Kodaikanal Synoptic Observations 
    Sivaraman, K. R (Indian Academy of Sciences, 2000-12)
    The synoptic observations of Kodaikanal form one of the longest unbroken solar data from the beginning of the 20th century to the present day, and consists of the white light and monochromatic images of the sun. In this ...
  • Results from the worldwide coma morphology campaign for comet ISON (C/2012 S1) 
    Samarasinha, N. H; Mueller, B. E. A; Knight, M. M; Farnham, T. L; Briol, J; Brosch, N; Caruso, J; Gao, X; Gomez, E; Lister, T; Hergenrother, C; Hoban, S; Prouty, R; Holloway, M; Howes, N; Guido, E; Hui, M. T; Jones, J. H; Penland, T. B; Thomas, S. R; Wyrosdick, J; Kiselev, N; Ivanova, A. V; Kaye, T (Elsevier B.V, 2015-12-01)
    We present the results of a global coma morphology campaign for comet C/2012 S1 (ISON), which was organized to involve both professional and amateur observers. In response to the campaign, many hundreds of images, from ...
  • Results of prominence obervations 
    Evershed, John; Evershed, M. A (Kodaikanal Observatory, Kodaikanal, 1917)
  • Results of the October 24, 1995 Solar Eclipse Balloon Experiments from Thumba 
    Appu, K. S; Santhikumar, K. S; Padmanabha Pillai, R; Narayanan, V; Chandrasekharan, C. K (Indian Institute of Astrophysics, Bangalore, 1997)
    Nine high-altitude meteorological radiosonde balloon ascents were conducted from Thumba and Trivandrum during 23rd - 25th October, 1995 to study the partial solar eclipse induced variations of the temperature and winds in ...
  • Return Meridional Flow in the Convection Zone from Latitudinal Motions of Umbrae of Sunspot Groups 
    Sivaraman, K. R; Sivaraman, H; Gupta, S. S; Howard, R. F (Springer, 2010-10)
    We have derived the velocities of meridional flows by measuring the latitudinal motions (or drifts) of umbrae of spot groups classified into three categories of area: 0 – 5 μ, 5 – 10 μ, and >10 μ (μ area in millionths of ...
  • Revealing the nature of star forming blue early-type galaxies at low redshift 
    George, K; Zingade, K (EDP Sciences, 2015-11)
    Context. Star forming early-type galaxies with blue optical colours at low redshift can be used to test our current understanding of galaxy formation and evolution. Aims. We want to reveal the fuel and triggering mechanism ...
  • Reverberation mapping of the Seyfert 1.5 galaxy H 0507+164 
    Jeyakumar, S; Stalin, C. S; Coziol, R (Instituto de Astronomia, UNAM, 2011-10)
    Light curves of the continuum at 5100 °A and Hβ line are obtained from spectroscopic monitoring observations of the Seyfert 1.5 galaxy H 0507+164. The mass of the black hole is calculated based on cross-correlation ...
  • Reversals in Bz component of interplanetary magnetic field and equatorial zonal electric field 
    Sastri, J. H (Elsevier, 1988-08)
    Sudden northward turnings of the Bz (North-South) component of the interplanetary magnetic field, IMF, are sometimes associated with anomalous reversals in the equatorial East-West electric field. The electric field reversal ...
  • A Revised Calibration of the M-V-W(O I 7774) Relationship using Hipparcos Data: Its Application to Cepheids and Evolved Stars 
    Ferro, A. A; Giridhar, S; Arellano, E. R (Instituto de Astronomía, Universidad Nacional Autónoma de México, 2003-04)
    A new calibration of the MV-W(O I 7774) relationship has been calculated using better reddening and distance estimates for a sample of 27 calibrator stars of spectral types A to G, based on accurate parallaxes and proper ...
  • Revised Surface Abundances of R Coronae Borealis Stars 
    Pandey, G; Hema, B. P; Reddy, A. B. S. (IOP Publishing, 2021-11-01)
    Surface abundances of 14 (11 majority class and three minority class) R Coronae Borealis stars (RCBs) along with the final-flash object, V4334 Sgr (Sakurai’s object) are revised based on their carbon abundances measured ...
  • Revisit of the classic Wilson effect 
    Bagare, S. P (Springer, 2010)
    We have examined theWilson effect in 580 epochs of sunspots observed at the Kodaikanal Observatory. Only unipolar spots that are well isolated from opposite polarity spots or pores (49%) exhibit the classic Wilson effect. ...
  • Revisiting the Dust Torus Size–Luminosity Relation Based on a Uniform Reverberation-mapping Analysis 
    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 ...
  • Revisiting the Transit Timing Variations in the TrES-3 and Qatar-1 Systems with TESS Data 
    Mannaday, Vineet Kumar; Thakur, Parijat; Southworth, John; Jiang, Ing-Guey; Sahu, D. K; Mancini, L; Vanko, M; Kundra, Emil; Gajdos, Pavol; A-thano, Napaporn; Sariya, Devesh P; Yeh, Li-Chin; Griv, Evgeny; Mkrtichian, David; Shlyapnikov, Aleksey (American Astronomical Society, 2022-11-01)
    We present and analyze 58 transit light curves of TrES-3b and 98 transit light curves of Qatar-1b, observed by the Transiting Exoplanet Survey Satellite, plus two transit light curves of Qatar-1b, observed by us, using a ...
  • Revisiting the variable star population in NGC 6229 and the structure of the horizontal branch 
    Arellano Ferro, A; Mancera Pina, P. E; Bramich, D. M; Giridhar, S; Ahumada, J. A; Kains, N; Kuppuswamy, K (Oxford University Press on behalf of the Royal Astronomical Society, 2015-09-01)
    We report an analysis of new V and I CCD time series photometry of the distant globular cluster NGC 6229. The principal aims were to explore the field of the cluster in search of new variables, and to Fourier decompose the ...
  • Revisiting the ‘cis-effect’ in 1,2-difluoro derivatives of ethylene and diazene using ab initio multireference methods 
    Banerjee, Debi; Ghosh, Anirban; Chattopadhyay, Sudip; Ghosh, Pradipta; Chaudhuri, R. K (Taylor & Francis, 2014-12)
    The relative stabilities of cis- and trans- isomers of 1,2-difluoroethylene and 1,2 difluorodiazene have been studied via the state-specific multireference coupled cluster (SS-MRCC) method and its perturbative counterpart ...
  • Rib Waveguide polarizer in GaAs/AlGaAs 
    Gupta, V. L; Sharma, E. K; Tripathi, K. N; Srivastava, G. P (Indian Institute of Astrophysics, Bangalore, 1991)
    Metal clad wave guides have an extremely large differential attenuation of TE and TM states of polarization and can be used to design efficient intergrated polarizers. Described here is a AlGaAs rib wave guide polarizer ...
  • Rigid Indian plate: Constraints from GPS measurements 
    Mahesh, P; Catherine, J. K; Gahalaut, V. K; Kundu, B; Ambikapathy, A; Bansal, A; Premkishore, L; Narsaiah, M; Ghavri, S; Chadha, R. K; Choudhary, P; Singh, D. K; Singh, S. K; Kumar, S; Nagarajan, B; Bhatt, B. C; Tiwari, R. P; Kumar, A; Kumar, A; Bhu, H; Kalita, S (Elsevier, 2012-11)
    We analyze GPS data from 26 sites located on the Indian plate and along its boundary. The large spatial coverage of the Indian plate by these sites and longer data duration helped us in refining the earlier estimates of ...

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