IIAP Publications: Recent submissions

  • On the progenitor of sup ernova 1987A 
    Parthasarathy, M; Branch, D; Jeffery, D. J (Astronomical Society of India, 2006-12)
    A previously unpublished ultralow­dispersion spectrum of Sand- uleak -69 202, the stellar progenitor of SN 1987A, is presented and the uncertain presupernova evolution of Sanduleak -69 202 is discussed.
  • Harmonically related decimetric fine structures 
    Sawant, H. S; Fernandes, F. C. R; Karlický, M; Mészárosová, H; Krishan, V; Cecatto, J. R; Madsen, F. R. H; Andrade, M. C (Elsevier B.V., 2006-02)
    We report rare events, above 1000 MHz, in which emission at the fundamental and at second harmonic frequencies show nearly identical fine structures. These high resolution observations are obtained from the Brazilian Solar ...
  • The influence of magnetic fields on radiative damping of magnetoatmospheric oscillations 
    Banerjee, D; Hasan, S. S; Christensen-Dalsgaard, J (International Astronomical Union, 1998)
    We examine the non adiabatic effects on the modes of an isothermal stratified magnetic atmosphere. The present investigation is a continuation of earlier work by Banerjee, Hasan & Christensen-Dalsgaard (1995, 1996, 1997), ...
  • Observations of variables 
    Rosario, M. J; Muneer, S; Raveendran, A. V; Mekkaden, M. V (IBVS / Konkoly Observatory, 2010-12)
    UX Ari was observed on a total of 33 nights during December 2008-February 2010 in standard Johnson BV bands with the 34-cm tel escope of Vainu Bappu Observatory, Kavalur. All the measurements were made with respect to 62 ...
  • Application of relativistic coupled-cluster theory to atomic parity non-conservation 
    Das, B. P; Sahoo, B. K; Gopakumar, G; Chaudhuri, R. K (Elsevier B.V., 2006-08)
    Despite the remarkable success of the standard model, it is widely believed that it is just an intermediate step in understanding the properties of the elementary particles in nature and the interactions between them. ...
  • Energetics of solar coronal mass ejections 
    Subramanian, P; Vourlidas, Angelos (EDP Sciences, 2007-05)
    Aims.We investigate whether solar coronal mass ejections are driven mainly by coupling to the ambient solar wind or through the release of internal magnetic energy. Methods.We examine the energetics of 39 flux-rope like ...
  • Evolved A-type stars 
    Parthasarathy, M (Cambridge University Press, 2004-12)
    A review of various types of evolved A stars is presented.
  • Many-body effects in hyperfine interactions in 205Pb+ 
    Sonjoy, M; Sahoo, B. K; Chaudhuri, R. K; Das, B. P; Mukherjee, D (EDP Sciences, 2007-03)
    Ab initio calculations have been carried out to study the magnetic dipole and electric quadrupole hyperfine structure constants of 205Pb+. Many-body effects have been considered to all orders using the relativistic ...
  • Theoretical studies of atomic transitions in boron-like ions: Mg VIII, Si X and S XII 
    Nataraj, H. S; Sahoo, B. K; Das, B. P; Chaudhuri, R. K; Mukherjee, D (2007-08)
    In this paper, we have carried out the calculations of the weighted oscillator strengths and the transition probabilities for a few low-lying transitions of boron-like ions: Mg VIII, Si X and S XII which are astrophysically ...
  • Phase separation in a two species Bose mixture 
    Mishra, T; Pai Ramesh, V; Das, B. P (The American Physical Society, 2007-07)
    We study the ground state quantum phase diagram for a two species Bose mixture in a one-dimensional optical lattice using the finite size density matrix renormalization group(FSDMRG) method. We discuss our results for ...
  • CH stars at high Galactic latitudes 
    Goswami, A (Blackwell Publishing, 2005-05)
    Carbon-rich stars of Population II, such as CH stars, can provide direct information on the role of low- to intermediate-mass stars of the halo in early Galactic evolution. Thus accurate knowledge of the CH stellar population ...
  • Observation of R-Band Variability of L Dwarfs 
    Maiti, M; Sengupta, S; Parihar, P. S; Anupama, G. C (University of Chicago Press, 2005-02)
    We report, for the first time, photometric variability of L dwarfs in the R band. Out of three L1 dwarfs (2MASS 1300+19, 2MASS 1439+19, and 2MASS 1658+70) observed, we have detected R-band variability in 2MASS 1300+19 and ...
  • Type Ia supernova SN 2003du: Optical observations 
    Anupama, G. C; Sahu, D. K; Jose, J (EDP Sciences, 2005-01)
    UBVRI photometry and optical spectra of type Ia supernova SN 2003du obtained at the Indian Astronomical Observatory for nearly a year since discovery are presented. The apparent magnitude at maximum was $B=13.53\pm ...
  • A multiwavelength study of the remnant of nova GK Persei 
    Anupama, G. C; Kantharia, N. G (EDP Sciences, 2005-09)
    We present new observations of the nebular remnant of the old nova GK Persei 1901 in the optical using the Himalayan Chandra Telescope (HCT) and at low radio frequencies using the Giant Metrewave Radio Telescope (GMRT). ...
  • Radio, millimeter and optical monitoring of GRB 030329 afterglow: constraining the double jet model 
    Resmi, L; Ishwara-Chandra, C. H; Castro-Tirado, A. J; Bhattacharya, D; Rao, A. P; Bremer, M; Pandey, S. B; Sahu, D. K; Bhatt, B. C; Sagar, R; Anupama, G. C; Subramaniam, A; Lundgren, A; Gorosabel, J; Guziy, S; de Ugarte Postigo, A; Castro Cerón, J. M; Wiklind, T (EDP Sciences, 2005-09)
    We present radio, millimeter and optical observations of the afterglow of GRB 030329. $UBVR_{\rm C}I_{\rm C}$ photometry is presented for a period of 3 h to 34 days after the burst. Radio monitoring at 1280 MHz has been ...
  • NGC 146: a young open cluster with a Herbig Be star and intermediate mass pre-main sequence stars 
    Subramaniam, A; Sahu, D. K; Sagar, R; Vijitha, P (EDP Sciences, 2005-09)
    We present UBV CCD photometry and low-resolution spectra of stars in the field of the young open cluster NGC 146. UBV photometry of 434 stars were used to estimate the E(B-V) reddening of 0.55 $\pm$ 0.04 mag and BV photometry ...
  • The Peculiar Type Ib Supernova SN 2005bf: Explosion of a Massive He Star with a Thin Hydrogen Envelope? 
    Anupama, G. C; Sahu, D. K; Deng, J; Nomoto, K; Tominaga, N; Tanaka, M; Mazzali, P. A; Prabhu, T. P (University of Chicago Press, 2005-09)
    We present BVRI photometry and optical spectroscopy of SN 2005bf near maximum light. The maximum phase is broad and occurred around 2005 May 7, about 40 days after the shock breakout. SN 2005bf has a peak bolometric magnitude ...
  • The Unique Type Ib Supernova 2005bf: A WN Star Explosion Model for Peculiar Light Curves and Spectra 
    Tominaga, N; Tanaka, M; Nomoto, K; Mazzali, P. A; Deng, J; Maeda, K; Umeda, H; Modjaz, M; Hicken, M; Challis, P; Kirshner, R. P; Wood-Vasey, W. M; Blake, C. H; Bloom, J. S; Skrutskie, M. F; Szentgyorgyi, A; Falco, E. E; Inada, N; Minezaki, T; Yoshii, Y; Kawabata, K; Iye, M; Anupama, G. C; Sahu, D. K; Prabhu, T. P (The American Astronomical Society, 2005-11-10)
    Observations and modeling for the light curve (LC) and spectra of supernova (SN) 2005bf are reported. This SN showed unique features: the LC had two maxima, and declined rapidly after the second maximum, while the spectra ...
  • Evolution of emission line activity in intermediate mass young stars 
    Manoj, P; Bhatt, H. C; Maheswar, G; Muneer, S (American Astronomical Society, 2006-12-10)
    We present optical spectra of 45 intermediate-mass Herbig Ae/Be stars. Together with the multiepoch spectroscopic and photometric data compiled for a large sample of these stars and ages estimated for individual stars by ...
  • Photometric study of type Ia supernova SN 2002hu 
    Sahu, D. K; Anupama, G. C; Prabhu, T. P (Blackwell Publishing, 2006-01)
    Optical UBVRI photometry of the type Ia supernova (SN Ia) SN 2002hu covering the period from −2 to +73 d since B maximum is presented. The supernova reached at maximum brightness in B on JD 245 2591.78 ± 0.5 with an apparent ...

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