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Browsing by Author "Iyengar, K. V. K"

Browsing by Author "Iyengar, K. V. K"

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  • Balloon-borne far-infrared mapping of galactic star forming regions 
    Das, B; Ghosh, S. K; Rengarajan, T. N; Verma, R. P; Iyengar, K. V. K; Tandon, S. N (Astronomical Society of India, 1993)
    Large angular areas (greater than 500 sq arcmin each) covering the three Galactic star forming regions (NGC 2024, OMC-1/OMC-2, and IRAS 06058 + 2138 and its neighborhood) have been mapped in two FIR bands (58 and 150 ...
  • 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 ...
  • Equivalent Widths of CA II Triplet Lines of a Few Unidentified IRAS Sources 
    Iyengar, K. V. K (Astronomical Society of India, 1997)
    We report optical infrared spectroscopy of sixteen bright IRAS "unidentified" sources with circumstellar envelopes in the region of the Ca II triplet lines. Several of these sources show low equivalent widths for the Ca ...
  • 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 ...
  • Far-infrared observations of three compact IRAS sources in Sh 247 star forming complex: IRAS 06056+2131, 06058+2138 and 06061+2151 
    Ghosh, S. K; Iyengar, K. V. K; Karnik, A. D; Rengarajan, T. N (Astronomical Society of India, 2000)
    Three compact IRAS sources -- IRAS 06056+2131, 06058+2138 and 06061+2151 in the Sh 247 complex and having IRAS colours typical of compact H II regions have been observed in the far-infrared using the TIFR 1 m balloon-borne ...
  • Infrared colors of RS CVn binaries 
    Rengarajan, T. N; Verma, R. P; Iyengar, K. V. K (Astronomical Society of India, 1993)
    IRAS 1D COADD data for 82 RS CVn systems have been analysed to obtain their magnitudes at 12 and 25 micrometers. Their colors V - (12) and (12) - (25) have been computed and discussed. For 62 stars, the excess at 12 ...
  • Near-simultaneous Spectroscopic and Broadband Polarimetric Observations of BE Stars 
    Ghosh, K; Iyengar, K. V. K; Ramsey, B. D; Austin, R. A (The American Astronomical Society, 1999-08)
    Near simultaneous optical spectroscopic (on four nights) and broadband linear continuum (B, V, R,and I bands) polarimetric (on seven nights) observations of 29 Be stars were carried out during 1993November-December. The ...
  • Optical identification and BVRI photometry of a few 'unidentified' IRAS sources of a late type stellar nature 
    Iyengar, K. V. K (Astronomical Society of India, 1993)
    A search for the optical counterparts of 21 'unidentified' IRAS sources was carried out using the Palomar Observatory Sky Survey (POSS), European Space Observatory (ESO) and Space Engineering Research Center (SERC) Sky ...
  • Optical identification of equatorial infrared catalogue number 1 sources previously identified with only AFGL sources 
    Iyengar, K. V. K; Tandon, S. N; Verma, R. P (Astronomical Society of India, 1983-09)
    We have identified, using Palomar Observatory Sky Survey (POSS) prints, the optical counterparts of six of the seven sources from the Equatorial Infrared Catalogue Number 1 (EIC-1) previously identified by Sweeney et al. ...
  • Rapid searches for counterparts of GRB 930131 
    Schaefer, Bradley. E; Barthelmy, Scott. D; Palmer, David. M; Cline, Thomas. L; Hurley, Kevin. C; Sommer, Michael; Boer, Michel; Niel, Michel; Fishman, Gerald. J; Kouveliotou, Chryssa; Meegan, Charles. A; Coe, M. J; Elmegreen, Bruce. G; McNamara, Bernard. J; Harrison, Thomas; Owens, Alan; Sollee, Neyle; Stull, John; Palermiti, Michael; Schwartz, Richard; Brooks, Jack; Vanderspek, Roland; Ricker, George. R; Krimm, Hans. A; Wenzel, Wolfgang; Greiner, Jochen; Hudec, Rene; Novak, Miroslav; Borovicka, Jiri; Predota, Miroslav; Bailyn, Charles. D; Hanlon, Lorraine. O; Bennett, K; Spoelstra, Titus. A. Th; Smette, Alain; Pedersen, Holger; Florentin, Ralph; Pollas, Christian; Steinle, Helmut; Schramm, K. J; Iyengar, K. V. K; Prabhu, T. P (American Astronomical Society, 1994-02)
    A fading counterpart to a gamma-ray burst (GRB) would appear as a point source inside a GRB error region soon after the burst which dims on a timescale from minutes to days. The favorable circumstances of the burst GRB ...
  • Report on A Symposium on Infrared and Submillimetre Astronomy 
    Iyengar, K. V. K (Astronomical Society of India, 1976-09)
  • Simultaneous infrared and H-alpha measurements of Be stars 
    Apparao, K. M. V; Tarafdar, S. P; Verma, R. P; Iyengar, K. V. K; Ghosh, K. K (Indian Academy of Sciences, 1993)
    The observed infrared excess in Be stars is usually interpreted as free-free and free-bound emission from a hot gas envelope around the Be star. This hot gas should also emit H-alpha line radiation. Earlier observations ...
  • Spectral classification of unidentified IRAS sources with F{_nu }(12 μm) >= F{_nu }(25 μm) 
    Iyengar, K. V. K; MacConnell, D. J (The European Southern Observatory, 1998-12)
    Spectral types of a large number of unidentified IRAS Point Sources with F{_nu }(12 μm) >= F{_nu }(25 μm) were determined; the majority are faint, oxygen-rich (M-type) or carbon-rich giant stars. The Guide Star Catalog has ...
  • Spectral types of a few 'Unientified' Equatorial Infrared Catalogue 1 (EIC-1) sources 
    Prabhu, T. P; Iyengar, K. V. K (Astronomical Society of India, 1984-12)
    Spectral types are assigned to 13 'unidentified' Equatorial Infrared Catalogue 1 (EIC-1) sources from a study of their spectra in the wavelength interval 5200-8700 A. Their spectral types range from M4.5 to M6.5. We infer ...

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