IIAP Publications: Recent submissions

  • Measurement of kodaikanal white-light images – V. Tilt-angle and size variations of sunspot groups 
    Howard, R. F; Sivaraman, K. R; Gupta, S. S (Springer, 2000-10)
    We examine here the variations of tilt angle and polarity separation (as defined in this paper) of multi-spot sunspot groups from the Kodaikanal and Mount Wilson data sets covering many decades. We confirm the tilt-angle ...
  • Periodicities in the North–South Asymmetry of the Solar Differential Rotation and Surface Magnetic Field 
    Javaraiah, J; Gokhale, M. H (Springer, 1997-02)
    We have studied the temporal variations in the north–south asymmetries of the differential rotation parameters A, B, and the mean rotation rate , by determining their values from Greenwich data for sunspot groups ...
  • Rapidly Rotating Strange Stars for a New Equation of State of Strange Quark Matter 
    Bombaci, I; Thampan, A. V; Datta, B (The American Astronomical Society, 2000-10)
    For a new equation of state of strange quark matter, we construct equilibrium sequences of rapidly rotating strange stars in general relativity. The sequences are the normal and supramassive evolutionary sequences of ...
  • Active nucleus in a post-starburst galaxy: KUG 1259+280 
    Dewangan, G. C; Singh, K. P; Mayya, Y. D; Anupama, G. C (The Royal Astronomical Society, 2000-10)
    We report the discovery of an active nucleus in a post-starburst galaxy, KUG 1259+280, based on its X-ray and optical characteristics. The X-ray source in KUG 1259+280 was detected during a search for ultrasoft sources in ...
  • Temperature Profiles of Accretion Disks around Rapidly Rotating Neutron Stars in General Relativity and the Implications for Cygnus X-2 
    Bhattacharyya, S; Thampan, A. V; Misra, R; Datta, B (The American Astronomical Society, 2000-10)
    We calculate the temperature profiles of (thin) accretion disks around rapidly rotating neutron stars (with low surface magnetic fields), taking into account the full effects of general relativity. We then consider a model ...
  • On Cooling Flows and the Sunyaev-Zeldovich Effect 
    Majumdar, S; Nath, B. B (The American Astronomical Society, 2000-10)
    We study the effect of cooling flows in galaxy clusters on the Sunyaev-Zeldovich (SZ) distortion and the possible cosmological implications. The SZ effect, along with X-ray observations of clusters, is used to determine ...
  • Magnetic field gradient and flare: study of a small flare in NOAA 8038 
    Mathew, S. K; Ambastha, A (Springer, 2000-11)
    Active region NOAA 8038 was observed from 10 to 13 May, 1997 using the USO solar video magnetograph. During this period, the active region was mostly inactive, and gave rise to only a single notable flare of 1N/C1.3 class ...
  • High-latitude molecular clouds and near-by OB associations 
    Bhatt, H. C (2000-09)
    The Galactic disribution of the high-latitude molecular clouds is considered. It is suggested that the majority of these clouds are clustered in two large shells around the two closest OB associations, Per OB3/Cas-Tau and ...
  • The Physical Conditions in a Polar Coronal Hole and Nearby Regions from Norikura and SOHO Observations 
    Raju, K. P; Sakurai, T; Ichimoto, K; Singh, J (The American Astronomical Society, 2000-11)
    The distribution of emission-line intensities, Doppler velocities, and line widths in a polar coronal hole and nearby regions are obtained from the spectroscopic observations carried out on 1998 November 3 at the Norikura ...
  • Joule Heating in Neutron Stars under Strong Gravitation 
    Sengupta, S (The American Astronomical Society, 2000-11)
    Considering Joule heating caused by the dissipation of the magnetic field in the neutron star crust to be an efficient mechanism in maintaining a relatively high surface temperature in very old neutron stars, the role of ...
  • A New Digital Display System for the 1-meter Telescope at Vainu Bappu Observatory 
    Srinivasan, R; Naidu, B. N (Astronomical Society of the Pacific, 1997-01)
    The Carl-Zeiss 1-meter telescope at Vainu Bappu Observatory uses synchro transmitters as angular transducers in a 3-stage geared train for the two axes coordinate display system. Synchro receivers are used in the console ...
  • High-resolution spectroscopy of R CrB - pulsations, shells and mass loss 
    Kameswara Rao, N; Lambert, D. L (The Royal Astronomical Society, 1997-01)
    High spectral resolution observations obtained in 1994 and spanning three pulsation cycles of R CrB are discussed along with available UBV photometric observations for the same epochs. Model atmosphere based analyses of ...
  • BVRI photometry of a few `unidentified' IRAS sources 
    Iyengar, K. V. K; Parthasarathy, M (EDP Sciences, 1997-01)
    We selected 33 unidentified IRAS sources based on the following criteria: i) galactic latitude more than 2 deg, ii) have flux density higher than 1 Jy at 12 microns, iii) have good fluxes at 12, 25, and 60 microns with ...
  • Electromagnetic properties of neutral and charged spin-1 particles 
    Nieves, J. F; Pal, P. B (The American Physical Society, 1997-03)
    The structure of the electromagnetic vertex of spin-1 particles is studied in a general way, for the diagonal as well as the off-diagonal couplings. In each case, we consider in detail the consequences of gauge invariance ...
  • Dispersion velocity of Galactic dark matter particles- Reply 
    Cowsik, R; Ratnam, C; Bhattacharjee, P (The American Physical Society, 1997-03)
    A Reply to the Comment by N. W. Evans. Also, Evalyn Gates, Marc Kamionkowski, and Michael S. Turner.
  • The Spectrum of the Cool R Coronae Borealis Variable S Apodis in a Deep Decline 
    Goswami, A; Kameswara Rao, N; Lambert, D. L; Smith, V. V (Astronomical Society of the Pacific, 1997-03)
    A high resolution spectrum (5575 - 8875\AA) of the cool R Coronae Borealis variable S Apodis in its 1993 deep decline is discussed. Narrow or chromospheric emission lines of Na I, K I, Ca II, and Ba II and broad emission ...
  • The solar dynamo with meridional circulation 
    Choudhuri, A. R; Schuessler, M; Dikpati, M (European Southern Observatory, 1997-03)
    In the mathematical form for the coefficient given in the expression (4) in this paper, the value of the parameters d and d should actually be 0.025R/sub0 instead of as printed. We became aware of this typographical error ...
  • Gyroscopic precession and centrifugal force in the Ernst spacetime 
    Rajesh Nayak, K; Vishveshwara, C. V (Springer, 1997-03)
    The phenomenon of gyroscopic precession in the Ernst spacetime is studied within the framework of the Frenet-Serret formalism. General formulae are obtained for circular orbits. At the same time general relativistic analogues ...
  • Detection of Short-Period Coronal Oscillations during the Total Solar Eclipse of 24 October, 1995 
    Singh, J; Cowsik, R; Raveendran, A. V; Bagare, S. P; Saxena, A. K; Sundararaman, K; Krishan, V; Naidu, N; Samson, J. P. A; Gabriel, F (Springer, 1997-02)
    An experiment to search for short-period oscillations in the solar corona was conducted during the total solar eclipse of 1995 October 24 at Kalpi, India. The intensity in the continuum, centred around 5500 Å and with a ...
  • Stellar contents of the open clusters Be 64 and Be 69 
    Pandey, A. K; Durgapal, A. K; Bhatt, B. C; Mohan, V; Mahra, H. S (EDP Sciences, 1997-04)
    We present UBVRI CCD photometry for previously unstudied open clusters (Be 64 and Be 69). Photometry has also been carried out for nearby fields to correct for the effects of field stars contamination. From the colour-colour ...

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