IIAP Publications: Recent submissions

  • Line profile variations in γ Doradus 
    Balona, L. A; Böhm, T; Foing, B. H; Ghosh, K. K; Janot-Pacheco, E; Krisciunas, K; Lagrange, A. M; Lawson, W. A; James, S. D; Baudrand, J; Catala, C; Dreux, M; Felenbok, P; Hearnshaw, J. B (Royal Astronomical Society, 1996-08)
    We present data from high-dispersion echelle spectra and simultaneous uvby photometry for γ Doradus. These data were obtained from several sites during 1994 November as part of the MUSICOS-94 campaign. The star has two ...
  • Metric Radio Observations and Ray-tracing Analysis of the Onset Phase of a Solar Eruptive Event 
    Kathiravan, C; Ramesh, R; Subramanian, K. R (University of Chicago Press, 2002-03)
    We report metric radio observations and the results obtained using two-dimensional ray-tracing analysis of the solar corona close to the onset phase of the exceptionally bright prominence eruption and the associated massive ...
  • A study of accretion discs around rapidly rotating neutron stars in general relativity and its applications to four low mass X-ray binaries 
    Bhattacharyya, S (E D P Sciences, 2002-02)
    We calculate the accretion disc temperature profiles, disc luminosities and boundary layer luminosities for rapidly rotating neutron stars considering the full effect of general relativity. We compare the theoretical values ...
  • A study of spatial structure of galactic open star clusters 
    Nilakshi; Sagar, R; Pandey, A. K; Mohan, V (E D P Sciences, 2002-02)
    In order to study the relation between the core and corona in galactic star clusters, the spatial structure of 38 rich open star clusters has been studied using radial density profiles derived from the photometric data of ...
  • delta Scuti stars in Praesepe. II. The STACC 1998 campaign - The spectroscopy 
    Dall, T. H; Frandsen, S; Lehmann, H; Anupama, G. C; Kambe, E; Handler, G; Kawanomoto, S; Watanabe, E; Fukata, M; Nagae, T; Horner, S (E D P Sciences, 2002-04)
    We present the results of a large international spectroscopic campaign on the delta Scuti star BN Cnc. Combining observations from five observatories taken over more than two weeks, we calculate line indices of the Hα line. ...
  • BVRIJHK photometry of post-AGB candidates 
    Fujii, T; Nakada, Y; Parthasarathy, M (E D P Sciences, 2002-04)
    BVRIJHK photometric observations are presented for 27 post-AGB candidates. Almost all objects show a double peaked SED curve in the optical to far-infrared wavelengths. Seventeen objects were classified as post-AGB stars ...
  • Change of rotation rates of sunspot groups during their lifetimes: Clues to the sites of origin of different flux tubes 
    Hiremath, K. M (E D P Sciences, 2002-05)
    From 103 years of data of non-recurrent sunspot groups and for the two sets (area <100 millionths of hemisphere and >100 millionths of hemisphere), irrespective of their life span, we compute rotation rates and rate of ...
  • Intranight optical monitoring of optically selected bright quasars 
    Sagar, R; Gopal-Krishna; Wiita, P. J (Royal Astronomical Society, 1996-08)
    As part of an ongoing programme to search for intranight optical variations, we report results for six radio-quiet and one radio-moderate, but all optically bright and luminous, quasi-stellar objects (QSOs), using the ...
  • Transition probabilities and dissociation energy of astrophysical molecule CoH 
    Prithivikumaran, N; Fernandez Gomez, M; Lopez Gonzalez, J. J; Bagare, S. P; Rajamanickam, N (Springer, 2002)
    The Franck-Condon (FC) factors (transition probabilities) and r-centroids have been evaluated by the reliable numerical integration procedure for the bands of the A^3 φ_4 --> X^3 φ_4 system of astrophysical molecule CoH, ...
  • Low resolution spectroscopy of ISOGAL sources: Search for early-type stars with infrared excess 
    Schultheis, M; Parthasarathy, M; Omont, A; Cohen, M; Ganesh, S; Sevre, F; Simon, G (E D P Sciences, 2002-05)
    An analysis of low resolution spectra and infrared data of 29 ISOGAL-DENIS sources with mid-IR excess is presented. Eight ISOGAL sources from our sample with 7-15 mu m excesses are found to be B and A-type stars, some of ...
  • New constants for SampsonLieske theory of the Galilean satellites of Jupiter from mutual occultation data 
    Vasundhara, R; Arlot, J. E; Descamps, P (International Astronomical Union, 1996)
    New constants for sampson-Lieske theory of the Galilean satellites have been derived using 6360 individual photographic positions (1891-1990) and 438 pseudo astrometric positions from mutual occulations during 1973,1979,1985 ...
  • Models of highly extended dust shells around R Coronae Borealis 
    Nagendra, K. N; Leung, C. M (Royal Astronomical Society, 1996-08)
    Radiation transport models are constructed for the dust shells of the hydrogen deficient supergiant star R Coronae Borealis (R CrB). IRAS observations of R CrB are used as constraints in selecting the model parameters. ...
  • CCD Photometry of the Open Cluster BE 69 
    Pandey, A. K; Durgapal, A. K; Bhatt, B. C; Mohan, V; Mahra, H. S (International Astronomical Union, 1996)
    The morphological features of CMDs of Be 69 are better understood in terms of convective overshooting.The Comparison of CMDs with the convective overshoot models (Bertelli et al. 1994)produces a good fit for metallicity ...
  • Primordial Flares, Flux Tubes, and Gamma-ray Bursts 
    Hiremath, K. M (International Astronomical Union, 2000)
    Given the prevailing physical conditions in the cosmic environment, the similarity of solar transients and cosmic gamma-ray bursts suggests that the most promising energy source for the latter may be primordial flares, ...
  • Internal Rotation of AB Doradus 
    Hiremath, K. M (International Astronomical Union, 2000)
    Using Chandrasekhar's MHD equations, we solve for the steady part of the internal rotation of AB Doradus. We estimate the size of the convective envelope to be ~40% of the radius and the rotation velocity at the base to ...
  • Compton Scattering, Pair Annihilation, and Pair Production in a Plasma 
    Krishan, V (International Astronomical Union, 2000)
    The square of the four-momentum of a photon in vacuum is zero. However, in an unmagnetized plasma, it is equal to the square of the plasma frequency. Further, the electron-photon coupling vertex is modified in a plasma to ...
  • HD 105262: a high latitude metal-poor post-AGB. A supergiant with large proper motion 
    Reddy, B. E; Parthasarathy, M; Sivarani, T (European Southern Observatory, 1996-09)
    The large proper motion post-AGB supergiant stars are very rare. HD 105262 is a high galactic latitude (+72deg) A-type star with large proper motion (0.057arcsec/year) and high c1-index. Earlier, it was classified as a ...
  • Search for Lithium-Rich Stars Among G-K Giants with IR-excess 
    Jasniewicz, G; Parthasarathy, M; de Laverny, P; Thevenin, F; Mauron, N; Chadid, M (International Astronomical Union, 2000)
    We report here new results about a search for Li- rich stars among 52 G-K giant stars which are known to have near IR excess. Eleven giants have been found to have loge (Li)≥ 1.0. Five are new Li-rich stars. We suspect ...
  • Evolution of Lithium Abundance in Pop I Giants 
    Mallik, S. G. V (International Astronomical Union, 2000)
    Recent observations of cool giants have shown that there exists a large range in their lithium abundances even for apparently similar stars. In order to explore whether this large spread could be interpreted in terms of ...
  • Dependence of Supergranular Length-Scales on Network Magnetic Fields 
    Raju, K. P; Singh, J (Springer, 2002-05)
    In an earlier paper by Raju, Srikanth, and Singh (1998), the average size of chromospheric network cells has been shown to have a dependence on the solar latitude. This was presumed to be due to the reduction of supergranular ...

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