IIAP Publications: Recent submissions

  • Far-infrared and radio continuum properties of spiral galaxies in clusters 
    Rengarajan, T. N; Karnik, A. D; Iyengar, K. V. K (The Royal Astronomical Society, 1997-09)
    Data on the far-infrared (FIR) and radio continuum properties of spiral galaxies in several clusters have been collected from the literature. To assess the effect of the cluster environment on the FIR and radio continuum ...
  • Elemental Abundances and Atmospheric Parameters of Seven F-G Supergiants 
    Giridhar, S; Ferro, A; Parrao, L (Astronomical Society of the Pacific, 1997-10)
    Spectroscopic abundance determinations for a sample of seven F-G stars have been carried out. The majority of them have large galactic latitudes. One objective in deriving spectroscopic abundances is to differentiate evolved ...
  • Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. X. Variability of Fairall 9 from Optical Data 
    Santos-Lleo, M; Chatzichristou, E; de Oliveira, C. M; Winge, C; Alloin, D; Peterson, B. M; Rodriguez-Pascual, P. M; Stirpe, G. M; Beers, T; Bragaglia, A; Claeskens, J. F; Federspiel, M; Giannuzzo, E; Gregorio-Hetem, J; Mathys, G; Salamanca, I; Stein, P; Stenholm, B; Wilhelm, R; Zanin, C; Albrecht, P; Calderon, J; Caretta, C. A; Carranza, G; da Costa, R. D. D; Diaz, R; Dietrich, M; Dottori, H; Elizalde, F; Goldes, G; Ghosh, K. K; Maia, M. A. G; Paolantonio, S; de Oliveira Filho, R. I; Rodriguez-Ardila, A; Schmitt, H. R; Soundararajaperumal, S; de Souza, R. E; Willmer, C. N. A; Zheng, W (American Astronomical Society, 1997-10)
    The results of an optical monitoring campaign on the active nucleus in the luminous Seyfert 1 galaxy Fairall 9 are presented. This campaign was undertaken in parallel with ultraviolet spectroscopic monitoring with the IUE ...
  • Lithium abundance and mass 
    Mallik, S. G. V (The European Southern Observatory, 1999-12)
    Observations of cool giants have shown that there exists a large range in their lithium abundances even for apparently similar stars. The depletions are large in a majority of them, far in excess of the predictions of the ...
  • On the hydrogen-deficient nature of Z Ursae Minoris 
    Goswami, A; Kameswara Rao, N; Lambert, D. L; Gonzalez, G (The Astronomical Society of the Pacific, 1997-05)
    Z Ursa Minoris was classified by Benson et al. (1994) a a R Coronae Borealis (RCB) variable star from its light variations. Hydrogen deficiency, which is a defining feature of RCB stars, was not established. To investigate ...
  • Computation of correlation effects on the parity-nonconserving electric-dipole transition in atomic ytterbium 
    Das, B. P (The American Physical Society, 1997-08)
    A high-precision experiment to measure parity-nonconservation in atomic Yb has been proposed recently [D. De Mille, Phys. Rev. Lett. 74, 4165 (1995)]. We use a relativistic configuration-interaction approach to highlight ...
  • Fast Plasma Processes in Active Galactic Nuclei 
    Krishan, V (Springer, 1997-05)
    The physics of active galactic nuclei (AGN) and related objects is one of the most actively pursued areas in astrophysics. Their large luminosities over the entire electromagnetic spectrum combined with extremely short-time ...
  • Rotation curves of galaxies: missing mass or missing physics 
    Krishan, V (Indian Academy of Science, 1997-07)
    The rotation curves of galaxies are modelled using very special properties of an hydrodynamically turbulent fluid possessing helicity fluctuations. The development of correlations among these fluctuations leads to the ...
  • A multiwavelength study of LS II+34 26: a hot post-AGB star in the process of becoming a planetary nebula 
    Garcia-Lario, P; Parthasarathy, M; de Martino, D; Sanz Fernandez de Cordoba, L; Monier, R; Manchado, A; Pottasch, S. R (European Southern Observatory, 1997-10)
    We present the results from a multiwavelength analysis of LS II+34 26, recently identified as a low mass post-AGB star and not a massive population I B-type star, as previously thought. We confirm that the central star is ...
  • Optical Spectra of Recent Supernovae of Type Ia: SN1995AL, SN1997Y, SN 1997BP 
    Anupama, G. C (American Astronomical Society, 1997-11)
    Optical spectra of three recent supernovae of type Ia: SN1995al in NGC 3021, SN1997Y in NGC 4675, and SN 1997bp in NGC 4680 are presented. Comparing the spectra with those of other normal type a supernovae, the epoch since ...
  • IRAS 17395-0841: A New Young Low Excitation Planetary Nebula 
    Vijapurkar, J; Drilling, J. S; Parthasarathy, M (American Astronomical Society, 1997-10)
    We report here the discovery of a new young low excitation planetary nebula IRAS 17395-0841.
  • The ultraviolet variations of the post-AGB star HD 89353 
    Monier, R; Parthasarathy, M (The European Southern Observatory, 1999-01)
    Based on an analysis of all low resolution spectra of HD 89353 (HR 4049) obtained with the International Ultraviolet Explorer (IUE) over several years and uniformly reprocessed, we report on large ultraviolet variations ...
  • Observations of BN and AN stars: New Be stars 
    Ghosh, K. K; Apparao, K. M. V; Pukalenthi, S (The European Southern Observatory, 1999-01)
    From a survey of spectra of Bn/An stars, we have detected seven new Be stars: HR 1056 (A0Vn), 1544 (A1Vn), 2191 (A0Vnn), 2300 (B8Vn), 3134 (B9.5 Vn), 3878 (B0.5 IIIn) and 4552 (B9IIIpSi). H_alpha profiles of these stars ...
  • Multi-colour optical monitoring of the intra-day variable blazar S5 0716+71 
    Sagar, R; Gopal-Krishna; Mohan, V; Pandey, A. K; Bhatt, B. C; Wagner, S. J (The European Southern Observatory, 1999-02)
    We report multi-colour optical monitoring of the intra-day variable blazar S5 0716+71 with a dense temporal coverage over a total duration of 4 weeks in February/March 1994. Four filters (BV Johnson and RI Cousins) were ...
  • Cerenkov radiation emitted by charged particles in a gravitational field 
    Gupta, A; Mohanty, S; Samal, M. K (Institute of Physics, 1999-01)
    Charged particles propagating in an external gravitational field with negative Ricci tensor components can emit radiation by the Cerenkov process. The external gravitational field acts like an effective refractive index ...
  • 5303Å Coronal Irradiance and Its Relation to the Photospheric Magnetic Activity 
    Ramesh, K. B (Kluwer Academic Publishers, 1998-12)
    The association of Lomnický Štít data of coronal green line irradiance (CI) to photospheric magnetic activity is studied for the years 1975-1994 using the Carrington rotation averaged photospheric magnetic flux data. It ...
  • Role of time resolution on polarization of pulsar radiation 
    Gangadhara, R. T; Xilouris, K. M; von Hoensbroech, A; Kramer, M; Jessner, A; Wielebinski, R (The European Southern Observatory, 1999-02)
    The role of orthogonal polarization modes in pulsar emission is re-examined in view of polarization data of high time resolution. Individual pulse data of PSR B1133+16 at 1.41 GHz, obtained with time resolutions of 1160, ...
  • N-Body Simulation of a Deeply Penetrating Collision Between Unequal Galaxies 
    Namboodiri, P. M. S; Sastry, K. S; Narasimhan, K. S. V. S (Kluwer Academic Publishers, 1998-09)
    We study the tidal effects of a deeply penetrating collision between two spherical galaxies, one twice massive but less dense than the other, by numerical simulations. We consider the relative motion of the galaxies to be ...
  • Ether, Luminosity and Galactic Source Counts 
    Tomaschitz, R (Kluwer Academic Publishers, 1998-08)
    An interpretation of the cosmological redshift in terms of a cosmic ether is given. We study a Robertson-Walker cosmology in which the ether is phenomenologically defined by a homogeneous and isotropic permeability tensor. ...
  • Implications of kHz quasi-periodic brightness oscillations in X-ray binaries for neutron star structure 
    Thampan, A. V; Bhattacharya, D; Datta, B (Blackwell Science Ltd., 1999-02)
    Kilohertz quasi-periodic oscillations (QPOs) in low-mass X-ray binaries (LMXBs) may represent the orbital frequencies of the innermost Keplerian orbits around accreting neutron stars. Attempts have recently been made to ...

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