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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Dhar, A; Mishra, T; Pai, R. V; Mukerjee, S; Das, B. P (American Physical Society, 2013-11-21)
    We study a system of hard-core bosons at half-filling in a one-dimensional optical superlattice. The bosons are allowed to hop to nearest- and next-nearest-neighbor sites. We obtain the ground-state phase diagram as a ...
  • 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 ...
  • Shejeelammal, J; Goswami, A; Shi, Jianrong (Oxford University Press on behalf of the Royal Astronomical Society, 2021-03)
    Carbon stars, enhanced in carbon and neutron-capture elements, provide a wealth of information about the nucleosynthesis history of the Galaxy. In this work, we present the first ever detailed abundance analysis of the ...
  • 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 ...
  • Kameswara Rao, N; Rajamohan, R (Indian Academy of Sciences, 1982-09)
    HD 147010, which is in the reflection nebula vdB 102, has been found to be a hot Ap silicon star rather than a normal A supergiant. From the UBV and JHK photometry of the star, color excess E(B-V) of 0.29 and the ratio of ...
  • Raveendran, A. V; Mohin, S; Mekkaden, M. V (Konkoly Observatory, 1985-03-26)
  • Arellano, F. A; Giridhar, S (The European Southern Observatory, 2003-09)
    We find the star HD 34700 to be a double-lined spectroscopic binary. We also identify it as a weak-line T Tauri object. The spectra of both components are very similar and both show the Li I feature at 6708 Å. Strong ...
  • Bharat Kumar, Y; Reddy, B. E (The American Astronomical Society, 2009-09)
    Results from high-resolution spectroscopic analysis of HD77361 are reported. LTE analysis shows that HD77361 is a K giant of atmospheric parameters: T-eff = 4580 +/- 75 K, log g = 2.5 +/- 0.1, and xi(t) = 1.40 +/- 0.5 km ...
  • Raveendran, A. V; Mekkaden, M. V; Mohin, S (Royal Astronomical Society, 1982-05)
    B and V photometry of HD 81410 obtained on 34 nights between January 3 and March 14 of 1981 is presented. In both B and V, the amplitudes are found to be approximately 0.15 mag. It is also found that a 12.86833 day period ...
  • Goswami, A; Aoki, W (Blackwell Publishing, 2010-05)
    High-resolution spectra obtained from the Subaru Telescope High Dispersion Spectrograph have been used to update the stellar atmospheric parameters and metallicity of the star HD 209621. We have derived a metallicity of ...
  • Goswami, A; Drisya, K; Shantikumar, N. S (IOP Publishing, 2010-11-10)
    Medium-resolution spectral analysis of candidate Faint High Latitude Carbon (FHLC) stars from the Hamburg/ESO survey has given us the potential to discover objects of rare types. Two primary spectral characteristics of R ...
  • Giridhar, S (Indian Institute of Astrophysics, 1978)
    A velocity curve of the Wolf-Rayet eclipsing system HD 214419 is obtained from measures on prismatic spectra of the Hell 5411 emission line. The shape of the velocity curve is unlike that obtained for Hell 4686. The emission ...
  • Shylaja, B. S (Indian Academy of Sciences, 1987-06)
    The behaviour of the λ4686 line of He II in various WN binaries is studied for variations in total flux as well as radial velocities. It appears that the true motion of the WN component is not depicted by this line especially ...
  • Namboodiri, P. M. S; Sastry, K. S; Narasimhan, K. S. V. S (2006-02)
    Numerical simulations are performed to study the tidal effects of non-merging rapid head-on collision between a disk galaxy and a spherical galaxy. The disk consists of three components – a disk, a bulge and a halo – and ...
  • Hasan, S. S (Springer-Verlag, 1991-01)
  • Kariyappa, R; Sivaraman, K. R; Anandaram, M. N (Springer, 1994-05)
    We have analyzed a large number of Ca II H line profiles at the sites of the bright points in the interior of the network using a 35-min-long time sequence of spectra obtained at the Vacuum Tower Telescope (VTT) of the ...
  • Krishan, V (Indian Institute of Astrophysics, Bangalore, 1988)
    The maintenance of the million degree solar corona continues to be a challenging and an inspiring problem. There are basically two different mechanisms of heating depending upon the dominance or otherwise of the magnetic ...
  • Sastri, J. H; Varma, V. K. M; Nayar, S. R. P (American Geophysical Union, 1995-10)
    Simultaneous measurements of F-region vertical drift are made in the evening hours (1700-2100 IST) at Trivandrum (dip 0.6°N) and Kodaikanal (dip 4°N) on fifteen days during December 1993- January 1994 using the HF phase ...
  • Mandal, K; Hanasoge, S. M; Rajaguru, S. P; Antia, H. M (IOP Publishing, 2018-08)
    Accurate inferences of solar meridional flow are crucial for understanding solar dynamo processes. Wave travel times, as measured on the surface, will change if the waves encounter perturbations, e.g., in the sound speed ...
  • Antia, H. M (Indian Institute of Astrophysics, Bangalore, 1988)
    Many of the oscillations observed at the solar surface have been identified with resonant normal modes of the entire solar body. Accurate measurements of frequencies of these modes enable us to study the internal structure ...

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