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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Recurrence feature of some of the great magnetic storms recorded at Kodaikanal (1949-1951) 
    Sivaramakrishnan, M. V (The India Meteorological Department, 1952-07)
  • Recurrence tendency of geomagnetic activity during the current sunspot minimum 
    Naqvi, Ali. M; Bhargava, B. N (Manager of Publications Civil Lines Delhi, 1954-12)
    Geomagnetic Activity during the three year period June 1950-June 1953, has been analysed and found to consist mainly of two very long sequences of recurrent (27-day period) moderate geomagnetic storms. During the three ...
  • The recurrent nova class of objects 
    Anupama, G. C (Astronomical Society of the Pacific, 2008)
    Recurrent novae (RNe) form a small, but heterogeneous class of cataclysmic variables that have more than one recorded outburst. There are ten known members of this class, with six short period binaries similar to classical ...
  • The recurrent novae and their relation with classical novae 
    Anupama, G. C (American Institute of Physics, 2002)
    Recurrent novae (RNe) are a subclass of cataclysmic variables classified based on recorded observations of more than one nova outburst. They form a small, but heterogeneous group of objects, with 10 known members, that ...
  • Recurrent novae at quiescence: systems with giant secondaries 
    Anupama, G. C; Mikołajewska, J (European Southern Observatory, 1999-04)
    Spectroscopic and photometric behaviour of the class of recurrent novae with giant secondaries (T Coronae Borealis, RS Ophiuchi, V3890 Sagittarii and V745 Scorpii) at quiescence are presented in this study. The hot component ...
  • Recurrent novae: Single degenerate progenitors of Type Ia supernovae 
    Anupama, G. C; Pavana, M (Springer, 2020-12)
    Type Ia supernovae are the result of explosive thermonuclear burning in CO white dwarfs. The progenitors of the Ia supernovae are white dwarfs in an interacting binary system. The donor companion is either a degenerate ...
  • Recurrent Novae: What Do We Know about Them? 
    Anupama, G. C (Cambridge University Press, 2013-01)
    Recurrent novae (RNe) belong to the group of cataclysmic variables that exhibit nova outbursts at intervals on the order of decades. They are rare, with 10 Galactic RNe known to date. Two are known in the LMC, while there ...
  • Recurring coronal holes and their rotation rates during the solar cycles 22-24 
    Prabhu, K; Ravindra, B; Hegde, M; Doddamani, V. H (Springer, 2018-05)
    Coronal holes (CHs) play a significant role in making the Earth geo-magnetically active during the declining and minimum phases of the solar cycle. In this study, we analysed the evolutionary characteristics of the Recurring ...
  • Recurring homologous solar eruptions in NOAA AR 11429 
    Dhakal, Suman K; Zhang, Jie; Vemareddy, P; Nishu Karna (IOP Publishing, 2020-09-20)
    We present the study of three homologous solar eruptions from NOAA active region (AR) 11429 over four days. This large and complex AR is divided into two relatively simple subregions: northeast (NE) and southwest (SW). ...
  • Red and blue stars in the direction of the Large Magellanic Cloud 
    Parthasarathy, M (International Astronomical Union, 1978)
    The Large Magellanic Cloud has been surveyed on ultralow dispersion (10,000 A/mm) plates taken with the 102-centimeter reflector at Kavalur. Many new red and blue stars were found. The LMC bar was found to have a strong ...
  • Red and reddened stars in the region of Cygnus OB2 (VI Cygni) association 
    Parthasarathy, M; Jain, S. K (European Southern Observatory, 1995-06)
    From an ultra-low dispersion spectroscopic survey of the Cyg OB2 association several red and reddened stars are detected. Most of these stars appear to be reddened early-type stars belonging to the Cygnus OB2 association. ...
  • Red giants in the Small Magellanic Cloud – I. Disc and tidal stream kinematics 
    Dobbie, P. D; Cole, A. A; Subramaniam, A; Keller, S (Oxford University Press on behalf of the Royal Astronomical Society, 2014-08-01)
    We present results from an extensive spectroscopic survey of field stars in the Small Magellanic Cloud (SMC). 3037 sources, predominantly first-ascent red giants, spread across roughly 37.5 deg2, are analysed. The line-of-sight ...
  • Red giants in the Small Magellanic Cloud – II. Metallicity gradient and age–metallicity relation 
    Dobbie, P. D; Cole, A. A; Subramaniam, A; Keller, S (Oxford University Press on behalf of the Royal Astronomical Society, 2014-08-01)
    We present results from the largest Ca ii triplet line metallicity study of Small Magellanic Cloud (SMC) field red giant stars to date, involving 3037 objects spread across approximately 37.5 deg2, centred on this galaxy. ...
  • Reddening and dust distribution around V348 SGR 
    Kameswara Rao, N; Nandy, K (Bruxelles : Palais des Académies, 1988)
    Radio and Brackett gamma observations indicate large value of reddening E(B - V) = 1.5 to the nebula surrounding V348 Sgr, where as the star appears to be reddened by only E(B - V) is approximately 0.4. The infrared ...
  • Reddening map of the Large Magellanic Cloud bar region 
    Subramaniam, A (EDP Sciences, 2005-02)
    E(V-I) reddening values for 1123 locations in the bar region of the Large Magellanic Cloud are presented. V, I photometry of red clump stars identified in the Optical Gravitational Lensing Experiment II catalogue of LMC ...
  • Reduction of Photoheliograms by IBM-PC controlled digitizer 
    Ambastha, A (Indian Institute of Astrophysics, Bangalore, 1988)
    A method is described here to determine heliographic coordinates of sunspots on a photoheliogram using an IBM-PC controlled digitizer. Sunspot proper-motions and buildup of magnetic energy in solar active regions may be ...
  • Refining the Fundamental Parameters of the 3 Post-AGB Stars: HR 4049, HD 52961 and HD 133656 Using Improved Model Atmospheres 
    Monier, R; Parthasarathy, M (Kluwer Academic Publishers, 1998)
  • Reflection and Refraction of (Magneto-)Acoustic Waves at the Magnetic Canopy: Further Evidences from Multi-Height Seismic Data 
    Rajaguru, S. P; Sun, Xudong; Hayashi, K; Couvidat, S (Astronomical Society of the Pacific, 2013-12)
    We recently presented evidence (Rajaguru et al. 2013) that seismic halos around expanding magnetic structures in the lower solar atmosphere are related to the acoustic to magnetoacoustic wave conversions, using multi-height ...
  • Reflection effect in close binaries 
    Peraiah, A (Centre of Advanced Study in Astronomy Osmania University, 1984)
    The author describes an initial attempt of how the radiation field is calculated from the irradiated surface of the component in a binary system.
  • Reflection effect in close binaries 
    Srinivasa Rao, M (The Astronomical Society of the Pacific, 2003-01)
    The theoretical modeling of binary systems can be performed by considering realistic models which take into account the radiative transfer, hydrodynamics, reflection effect, temperature structure etc. Since the problem is ...

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