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Browsing by Author "Ghosh, K. K"

Browsing by Author "Ghosh, K. K"

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  • CCD photometry in VRI bands of the galactic cluster NGC 2818 
    Surendiranath, R; Kameswara Rao, N; Sagar, R; Nathan, J. S; Ghosh, K. K (Indian Academy of Sciences, 1990-06)
    The open cluster NGC 2818 containing a planetary nebula has been observed in VRI bands using the CCD system at prime focus of the 2.3 meter Vainu Bappu Telescope. The study extending to stars V of 21 magnitude established ...
  • Detection of a new Be Star - gamma Lup 
    Ghosh, K. K; Kuppuswamy, K; Jaykumar, K; Rosario, M. J; Velu, C (Konkoly Observatory, 1987-08)
  • Detection of additional absorption in the post-outburst spectra of MU Centauri 
    Ghosh, K. K; Kuppuswamy, K; Pukalenthi, S; Selvakumar, G (The American Astronomical Society, 1991-09)
    A large number of photographic (92) and CCD (27) spectra of the pole-on Be star, Mu Cen, were obtained between February 1987 and May 1990. From the results of the above-mentioned spectra a weak outburst was detected in ...
  • Evolution of the optical spectrum of SN 1987a in the Large Magellanic Cloud 
    Ashoka, B. N; Anupama, G. C; Prabhu, T. P; Giridhar, S; Ghosh, K. K; Jain, S. K; Pati, A. K; Kameswara Rao, N (Indian Academy of Sciences, 1987-06)
    The evolution of the spectrum of SN 1987a is traced from 1987 February 26 to March 31. Based on the low-resolution spectroscopic data the authors identify the lines of H, He I, Na I, Fe II, Sc II, Ca II which are known to ...
  • EXOSAT observations of the broad-line radio galaxy 3C 382 
    Ghosh, K. K; Soundararajaperumal, S (University of Chicago Press, 1992-04)
    Results are presented of numerous X-ray observations of the broad-line radio galaxy 3C 382 carried out with Exosat between 1983 and 1985, with emphasis on a major outburst of this galaxy in 1985. During the outburst, both ...
  • EXOSAT observations of the Seyfert 1 galaxy NGC 3516 
    Ghosh, K. K; Soundararajaperumal, S (University of Chicago press, 1991-12)
    This study presents results of the X-ray spectra (0.1-10 keV) of the Seyfert galaxy NGC 3516 on the basis of Exosat observations obtained on four epochs between 1985/308 and 1985/340. The soft X-ray (0.2-2 keV) flux of ...
  • Expanding shell and P Cygni profiles of 27 Canis Majoris 
    Ghosh, K. K (American Astronomical Society, 1990-09)
    H-alpha and He I profiles of 27 CMa obtained between January 1985 and February 1989 are presented. Velocities of blue absorption and red emission components of H-alpha were different from that of He I, suggesting that the ...
  • First X-ray spectrum of the most luminous quasar PKS 2126 - 158 
    Ghosh, K. K; Soundararajaperumal, S (EDP Sciences, 1992-11)
    For the first time the detailed results of the spectral analysis of the X-ray (0.1 - 10 keV) spectrum of the luminous radio-loud quasar PKS 2126 - 158 are presented. Power law and fixed absorption model fits well with the ...
  • Flare-like activity in Be stars HR 7403 and .8762 
    Ghosh, K. K (D. Reidel Publishing Co., 1989-05)
    Results are presented from rapid spectrophotometric observations of the Be stars HR 7403 and HR 8762. The observations were conducted between November, 1984 and December, 1985. No ultrarapid variations were detected in the ...
  • Further spectroscopic observations of SN 1987A 
    Anupama, G. C; Prabhu, T. P; Ghosh, K. K; Ashoka, B. N; Giridhar, S (Elsevier, 1988)
    Spectroscopic observations of SN 1987a obtained during 1987 August 30 – September 8 from Vainu Bappu Observatory, Kavalur, are presented; the spectrum is compared and contrasted with the spectra recorded at earlier epochs. ...
  • Gravitational instability of interstellar magnetic clouds 
    Ghosh, K. K; Bhattacharyya, J. C (D. Reidel Publishing Co.,, 1985-12)
    The gravitational instability of a nonrotating isothermal gaseous disk permeated by a uniform frozen-in magnetic field is investigated using a fourth-order perturbation technique. From the results it is found that the disk ...
  • Identification of emission bands in P/Halley 
    Bhattacharyya, J. C; Babu, G. S. D; Ghosh, K. K; Jayakumar, K; Appakutty, M (Indian Academy of Sciences, 1986)
    Spectrophotometric studies of P /Halley (r = 1.98 AU, Δ= 1.19AU, r = 1.97, Δ = 1.16 AU and r = 1.95 AU, Δ. = 1.13 AU) in the spectral range 3900 A - 6450 A were made on three nights and identifications of emission features ...
  • Interstellar shocked region chemistry - certain reactions between interstellar molecules and O and N atoms 
    Ghosh, K. K; Saleem, S. S; Kutty, K. N (International Astronomical Union, 1987)
    The reactions between O and N atoms and certain interstellar molecules (H/sub2S, NH/sub3, H/sub2CO, CH/sub3OH, C/sub2H/sub5OH) are studied using the dynamical flowing after glow method. It is found that NH and OH radicals ...
  • Line profile variations in γ Doradus 
    Balona, L. A; Böhm, T; Foing, B. H; Ghosh, K. K; Janot-Pacheco, E; Krisciunas, K; Lagrange, A. M; Lawson, W. A; James, S. D; Baudrand, J; Catala, C; Dreux, M; Felenbok, P; Hearnshaw, J. B (Royal Astronomical Society, 1996-08)
    We present data from high-dispersion echelle spectra and simultaneous uvby photometry for γ Doradus. These data were obtained from several sites during 1994 November as part of the MUSICOS-94 campaign. The star has two ...
  • Multifrequency Spectra of EXOSAT Blazars. 
    Ghosh, K. K; Soundararajaperumal, S (University of Chicago Press, 1995-09)
    Blazars have been divided into two groups: radio-selected blazars (RBLs) and X-ray-selected blazars (XBLs). Results of the X-ray spectral analysis of 28 such blazars which were observed with EXOSAT are presented in this ...
  • Multisite observations of surface structures on AB Doradus in 1994 November 
    Collier Cameron, A; Walter, F. M; Vilhu, O; Böhm, T; Catala, C; Char, S; Clarke, F. J; Felenbok, P; Foing, B. H; Ghosh, K. K; Hao, J; Huang, L; Jackson, D. A; Janot-Pacheco, E; Jiang, S; Lagrange, A. M; Suntzeff, N; Zhai, D. S (The Royal Astronomical Society, 1999-09)
    We present time-resolved optical spectroscopy and broad-band photometry of the rapidly rotating southern K0 dwarf star AB Doradus, obtained during 1994 November. The data were obtained as part of a collaboration dedicated ...
  • Nova Herculis 1991 
    Iijima, T; Gehrz, R. D; Jones, T. J; Lawrence, G; Sivaraman, K. R; Prabhu, T. P; Ghosh, K. K; Anupama, G. C; Selvakumar, G (Smithsonian Astrophysical Observatory, 1991-04)
  • Observation of an H-alpha outburst in the Be star HR 4123 
    Ghosh, K. K; Apparao, K. M. V; Tarafdar, S. P (American Astronomical Society, 1989-09)
    During routine monitoring of the Be star HR 4123 during the year 1987-1988, a burst of H-alpha emission was observed on May 11, 1987. The increase was observed on May 9 and lasted until June 7, peaking to an equivalent ...
  • Observations of BN and AN stars: New Be stars 
    Ghosh, K. K; Apparao, K. M. V; Pukalenthi, S (The European Southern Observatory, 1999-01)
    From a survey of spectra of Bn/An stars, we have detected seven new Be stars: HR 1056 (A0Vn), 1544 (A1Vn), 2191 (A0Vnn), 2300 (B8Vn), 3134 (B9.5 Vn), 3878 (B0.5 IIIn) and 4552 (B9IIIpSi). H_alpha profiles of these stars ...
  • Optical Microvariability of Blazars 
    Ghosh, K. K; Kim, C; Ramsey, B. D; Soundararajaperumal, S (Korean Astronomical Society, 2001-04)
    We present the results of optical differential photometry of five blazars [PKS 0219+428(3C66A), PKS 0235+164(AO 0235+16), H0414+019, PKS 0851+202(OJ 287), and QSO 1807+698(3C371)] that were observed on 7 nights between ...

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