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Browsing by Author "Kuppuswamy, K"

Browsing by Author "Kuppuswamy, K"

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  • Rapid H-alpha variability in Phi Persei 
    Ghosh, K. K; Sanjeevkumar, T; Jaykumar, K; Kuppuswamy, K; Rosario, M. J (Astronomical Society of the Pacific, 1988-06)
    A search for rapid variability of H-alpha with a time resolution from 30 to 45 seconds is performed for Phi Per. In total, 42 spectra in H-alpha were obtained during three nights. Results show the presence of rapid irregular ...
  • Recent onset of an outburst in mu centauri 
    Ghosh, K. K; Velu, C; Kuppuswamy, K; Jaykumar, K; Rosario, M. J (Konkoly Observatory, 1987-08)
  • Revisiting the variable star population in NGC 6229 and the structure of the horizontal branch 
    Arellano Ferro, A; Mancera Pina, P. E; Bramich, D. M; Giridhar, S; Ahumada, J. A; Kains, N; Kuppuswamy, K (Oxford University Press on behalf of the Royal Astronomical Society, 2015-09-01)
    We report an analysis of new V and I CCD time series photometry of the distant globular cluster NGC 6229. The principal aims were to explore the field of the cluster in search of new variables, and to Fourier decompose the ...
  • Search for rapid spectral variability in Be stars - Alpha Columbae, Rho Carinae and Eta Centauri 
    Ghosh, K. K; Pukalenthi, S; Jaykumar, K; Kuppuswamy, K; Sanjeevkumar, T; Muniandi, A (European Southern Observatory, 1990-03)
    A series of H-alpha profiles (in total 1006 spectra in the H-alpha region) with the time resolution around 45 s were obtained on six nights between January 29 and February 7, 1988, to search for rapid spectral variability ...
  • A Search for Rotationally Modulated Hα Variability in OB Supergiants 
    Morel, T; Marchenko, S. V; Pati, A. K; Kuppuswamy, K; Carini, M. T; Wood, E; Zimmerman, R (Cambridge University Press, 2004)
  • Some further characteristics of observing conditions at Leh 
    Singh, J; Bhattacharyya, J. C; Babu, G. S. D; Appakutty, M; Kuppuswamy, K; Moorthy, V; Devendran, P; Velu, C; Sivakumar, R (Astronomical Society of India, 1990-03)
    The sky conditions were monitored and duration of photometric and spectroscopic hours determined on 198 nights during the period September 1984 to October 1986. Observations were continued from May till November 1987 and ...
  • Some further characteristics of observing conditions at Leh 
    Singh, J; Bhattacharyya, J. C; Babu, G. S. D; Appakutty, M; Kuppuswamy, K; Moorthy, V; Devendran, P; Velu, C; Sivakumar, R (Astronomical Society of India, 1990-03)
    The sky conditions were monitored and duration of photometric and spectroscopic hours determined on 198 nights during the period September 1984 to October 1986. Observations were continued from May till November 1987 and ...
  • The unusually large population of Blazhko variables in the globular cluster NGC 5024 (M53) 
    Arellano Ferro, A; Bramich, D. M; Figuera Jaimes, R; Giridhar, S; Kuppuswamy, K (Wiley-Blackwell, 2012-02)
    We report the discovery of amplitude and phase modulations typical of the Blazhko effect in 22 RRc and nine RRab type RR Lyrae stars in NGC 5024 (M53). This brings the confirmed Blazhko variables in this cluster to 23 RRc ...
  • Variable Stars in the Globular Cluster NGC 288: [Fe/H] and Distance 
    Ferro, A. A; Bramich, D.M; Giridhar, S; Jaimes, R. F; Kains, N; Kuppuswamy, K (Copernicus Foundation for Polish Astronomy, 2013-12)
    A search for variable stars in the globular cluster NGC 288 was carried out using a time-series of CCD images in the V and I filters. The photometry of all stellar sources in the field of view of our images, down to V≈19 ...
  • Variable stars in the globular cluster NGC 7492. New discoveries and physical parameter determination 
    Figuera Jaimes, R; Arellano Ferro, A; Bramich, D. M; Giridhar, S; Kuppuswamy, K (EDP Sciences, 2013-08)
    Aims. We have performed a photometric V,R,I CCD time-series analysis with a baseline of about eight years of the outer-halo globular cluster NGC 7492 with the aim of searching for new variables and using these (and the ...
  • Variable stars in the old galactic cluster M67 
    Rajamohan, R; Bhattacharyya, J. C; Subramanian, V; Kuppuswamy, K (Astronomical Society of Indian, 1988-12)
    Schmidt plates of the old open galactic cluster M67 were obtained on twelve nights to find the most probable variables in the cluster. The Sabattier technique was used to derive the magnitudes of the cluster members. The ...

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