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Browsing IIAP Publications by Title

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  • Spectroscopic survey of ASAS eclipsing variables: search for chromospherically active eclipsing binary stars - I 
    Parihar, P. S; Messina, S; Bama, P; Medhi, B. J; Muneer, S; Velu, C; Ahmad, A (Royal Astronomical Society, 2009-05)
    We have started a spectroscopic survey to identify new chromospherically active components and low-mass pre-main sequence (PMS) stars in recently discovered All Sky Automated Survey (ASAS) eclipsing binaries. In this paper, ...
  • Spectroscopic survey of emission line stars in open clusters 
    Subramaniam, A; Mathew, B (Springer, 2010)
    We summarize a study of emission-line stars in young open clusters. The study was done in two phases. The first phase was the survey, where the emission stars in young open clusters were identified using the slitless ...
  • Spectroscopy of Be stars in young open clusters 
    Mathew, B; Subramaniam, A (Astronomical Society of India, 2010)
    A spectroscopic study of 152 Classical Be stars in 42 young open clusters was performed using medium resolution spectra in 3700-9000 A range, to understand the Be phenomenon. The Balmer decrement is found to have a ...
  • SPECTROSCOPY OF BRIGHT ALGOL-TYPE SEMI-DETACHED CLOSE BINARY SYSTEM HU TAURI (HR 1471) 
    Parthasarathy, M (Konkoly Observatory, 2018-01-23)
    Radial velocities of the primary component (B8V) of HU Tauri derived from the photographic spectra obtained during January 1974 to December 1974 and spectroscopic orbital elements from the analysis of the radial velocity ...
  • Spectroscopy of HD 168625 (IRAS 18184-1623) 
    García, L. P; Sivarani, T; Parthasarathy, M; Manchado, A (Kluwer Academic Publishers, 2001-08)
    HD 168625 (B9-A0 Ia) was classified as a post-AGB star and also as a luminous blue variable. We have analysed the high resolution optical spectra of HD 168625 and derived the atmospheric parameters and the chemical ...
  • Spectroscopy of He atom encapsulated in C60 cage: low lying magnetic dipolar (M1) and magnetic quadrupolar (M2) transitions 
    Chaudhuri, S. K (Canadian science publishing, 2022-08)
    The spectroscopic properties of magnetic dipolar and quadrupolar transitions (M1 and M2) of He atom encapsulated under neutral and charged C60 fullerene cage have been estimated here to understand the effect of cage ...
  • Spectroscopy of post-AGB a-supergiant HD 101584 (IRAS 11385-5517) 
    Sivarani, T; Parthasarathy, M; García, L. P; Manchado, A; Pottasch, S. R (Kluwer Academic Publishers, 2001-08)
    In the high resolution optical spectra we identified forbidden lines of [OI] and [CI], which indicate the presence of low excitation nebula. There are many emission lines due forbidden and permitted lines of neutral and ...
  • Spectroscopy of post-AGB candidate HD 331319 (IRAS 19475+3119) 
    Sivarani, T; Parthasarathy, M; García, L. P; Manchado, A (Kluwer Academic Publishers, 2001-08)
    HD 331319 is a F3 Ib star with a detached cold circumstellar dust shell with far-IR colours similar to planetary nebulae. From an analysis of high resolution spectra using LTE stellar atmospheric models, we have derived ...
  • Spectroscopy of post-AGB candidate IRAS 10215-5916 
    Sivarani, T; Parthasarathy, M; García, L. P; Manchado, A (Kluwer Academic Publishers, 2001-08)
    IRAS 10215-5916 was classified as a post-AGB star and also as a massive red supergiant. It was also found to be a spectroscopic binary. In our high resolution spectra we found molecular features from a cool star of Teff = ...
  • Spectroscopy of Protonated and Deprotonated PAHs 
    Hammonds, M; Pathak, A; Candian, A; Sarre, P. J (EDP Sciences, 2011-03)
    The spectroscopic properties of protonated and deprotonated PAHs are investigated through Density Functional Theory (DFT) calculations, with reference to their potential astrophysical significance. Attention is focussed ...
  • Spectroscopy of Scorpi-Centaurus association 
    Rajamohan, R (Centre of Advanced Study in Astronomy,Osmania University, 1973)
    Rotational velocities and intensities of hydrogen and helium lines for over 40 members of the Scorpio Centaurus association are presented. From the measured equivalent width of Hr and Hd some evidence is found for the ...
  • Spectroscopy of Scorpio-Centaurus association 
    Rajamohan, R (Centre of Advanced Study in Astronomy, Osmania University, 1973)
    Rotational velocities and intensities of hydrogen and helium lines for over 40 members of the Scorpio Centaurus association are presented. From the measured equivalent width of H alpha and H delta some evidence is found ...
  • Spectroscopy of the post-AGB star HD 101584 (IRAS 11385-5517) 
    Sivarani, T; Parthasarathy, M; García-Lario, P; Manchado, A; Pottasch, S. R (The European Southern Observatory, 1999-06)
    From an analysis of the spectrum (4000 Ä to 8800 Ä) of HD 101584 it is found that most of the neutral and single ionized metallic lines are in emission. The forbidden emission lines of [OI] 6300 Ä and 6363 Ä and [CI] 8727 ...
  • Spectroscopy, Multicolour Photometry and Structure of the Solar Corona during the Total Solar Eclipse on October 24, 1995 
    Rusin, V; Klocok, L; Minarovjech, M; Rybansky, M (Indian Institute of Astrophysics, Bangalore, 1997)
    A brief description of the scientific goals and preliminary results related to the 24 October 1995 solar eclipse at Nim Ka Thana is given. The white-light corona was of a minimum type above the E- and W-limbs. Coronal holes ...
  • The Spectrum of Comet Ikeya-Seki (1965f) 
    Bappu, M. K. V; Sivaraman, K. R (Kodaikanal Obsevatory, 1966-12)
    Spectroscopic observations of Comet Ikeya-Seki (1965f) with slit and slitless instruments are described. Sodium emission in the coma is seen from October 9 to November 1. A sodium tail extending upto 2 degree from the ...
  • Spectrum of density fluctuations in the solar wind 
    Krishan, V (World Scientific Publishing Company, 2009)
    The power spectrum of density fluctuations in the solar wind and its relations with the spectra of the velocity and magnetic field fluctuations is investigated. The density fluctuations could behave as a passive scalar and ...
  • Spectrum of doubly ionised arsenic 
    Rao, A. S; Narayan, A. L (Nature Publishing Group, 1929-08-10)
    THE deepest term of the separation of doubly ionised arsenic (As III) is 4p 2P1. The values of these doublet terms relative to 2G were reported in a recent paper (Ind. J. Phy., 5, 3, p. 3) to be 220, 221 cm.-1. It was found ...
  • The spectrum of gamma velorum 
    Rajamohan, R (Centre of Advanced Study in Astronomy, Osmania University, 1973)
    From a measurement of the equivalent width of H alpha in the star gamma 1 Velorum, it is found that My (gamma1 Vel)=-3.1. Assummg gamma 1 and 2 Velorum are at the same distance, a distance modulus of 7.4 magnitudes for ...
  • Spectrum of S Aps at deep minimum 
    Kameswara Rao, N; Goswami, A; Smith, V. V; Lambert, D. L (Astronomical Society of the Pacific, 1996)
  • Spectrum of Solar Type I Continuum Noise Storm in the 50-80 MHz Band and Plasma Characteristics in the Associated Source Region 
    Sundaram, G. A. S; Subramanian, K. R (The American Astronomical Society, 2004-04-20)
    Continuum observations of a solar noise storm in the frequency range of 50-80 MHz observed with the Gauribidanur radio spectrograph during 2000 September 26 and 27 are presented here. The radio spectral index of the noise ...

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