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Browsing by Author "Parthasarathy, M"

Browsing by Author "Parthasarathy, M"

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  • Study of UV bright sources in globular cluster NGC 4590 using Ultraviolet Imaging Telescope (UVIT) observations 
    Kumar, Ranjan; Pradhan, Ananta C; Parthasarathy, M; Piridi, Sonika; Cassisi, Santi; Ojha, Devendra K; Mohapatra, Abhisek; Murthy, J (Oxford University Press on behalf of Royal Astronomical Society, 2022-04)
    We have studied ultraviolet (UV) bright sources in the Galactic globular cluster (GGC) NGC 4590 using Ultraviolet Imaging Telescope onboard the AstroSat satellite. Using UV-optical colour–magnitude diagrams (CMDs), we ...
  • A survey of red stars in the direction of the Large Magellanic Cloud. 2. Some regions around the bar. 
    Bappu, M. K. V; Parthasarathy, M; Scaria, K. K (Indian Institute of Astrophysics, 1978)
    We have continued the survey for red stars in the direction of the large Magellanic Cloud using the technique of ultra-low dispersion spectroscopy. This paper which is the second one on the series lists 706 stars located ...
  • A Survey of Red Stars in the Direction of the Large Magellanic Cloud. III. Some Regions North of Bar 
    Bappu, M. K. V; Parthasarathy, M; Scaria, K. K (Indian Institute of Astrophysics, Bangalore, 1985-11)
    We have continued the survey for red stars in the direction of the Large Magellanic Cloud using the technique of ultra-low dispersion spectroscopy. In this paper we list 310 red stars located north of L M C bar. Finding ...
  • A Survey of Red Stars in the Direction of the Large Magellanic Cloud: The 30 Doradus Region 
    Bappu, M. K. V; Parthasarathy, M; Scaria, K. K (Indian Institute of Astrophysics, Bangalore, 1977)
    We have commenced a survey of red stars in the direction of the Large Magellanic Cloud using the technique of ultra-low dispersion spectroscopy. This first paper is a listing of the red stars in the 30 Doradus region for ...
  • Tidal disruption and tidal coalescence in binary stellar systems 
    Alladin, S. M; Parthasarathy, M (Royal Astronomical Society, 1978-09)
    Tidal effects in binary stellar systems are considered. The rate of increase of the binding energy of a component and the rate of decrease of the energy of the orbital motion of the binary are estimated under the simplifying ...
  • Two-dimensional Monte Carlo radiative transfer modelling of the disc-shaped secondary of Epsilon Aurigae 
    Muthumariappan, C; Parthasarathy, M (Wiley Blackwell, 2012-07)
    We present two-dimensional Monte Carlo radiative transfer models for the disc of the eclipsing binary Epsilon Aurigae by fitting its spectral energy distribution (SED) from optical to far-infrared (IR) wavelengths. We also ...
  • UBV photometry of RV CrV 
    Abhyankar, K. D; Parthasarathy, M; Sanwal, N. B; Sarma, M. B. K (European Southern Observatory, 1974-01)
  • UBVRI polarization measurements of POST AGB Stars 
    Parthasarathy, M; Jain, S. K (International Astronomical Union, 1993)
  • Ultra-low dispersion spectroscopy of stars and galaxies 
    Bappu, M. K. V; Parthasarathy, M (Indian Institute of Astrophysics, Bangalore, 1977)
    Application of ultra-low dispersion spectroscopy (10.000 Å mm-1) is described to study the nuclei of elliptical galaxies, the quassi - stellar objects and for the discovery of faint OB stars, reddened stars and red stars. ...
  • Ultraviolet Imaging Telescope (UVIT) observation of the Galactic globular cluster NGC 7492 
    Kumar, R; Pradhan, A. C; Mohapatra, Abhisek; Moharana, Ayush; Ojha, D. K; Parthasarathy, M; Murthy, J (Oxford University Press on behalf of the Royal Astronomical Society, 2021-03)
    We present detailed photometric observations of the Galactic globular cluster NGC 7492 using the data obtained with two far-ultraviolet (FUV; 1300–1800 Å) and three near-ultraviolet (NUV; 2000–3000 Å) filters of Ultraviolet ...
  • The ultraviolet spectrum of the hydrogen-poor binary HD 30353 
    Parthasarathy, M; Hack, M; Tektunali, G (The European Southern Observatory, 1990-04)
    An analysis is made of the high- and low-resolution UV spectra of the hydrogen-poor star HD 30353. The stellar wind profiles of the resonance lines of N V, C V, and Si IV are found to be similar to those observed in Upsilon ...
  • The ultraviolet variations of the post-AGB star HD 89353 
    Monier, R; Parthasarathy, M (The European Southern Observatory, 1999-01)
    Based on an analysis of all low resolution spectra of HD 89353 (HR 4049) obtained with the International Ultraviolet Explorer (IUE) over several years and uniformly reprocessed, we report on large ultraviolet variations ...
  • UV (IUE) spectra of the central stars of high latitude planetary nebulae Hb7 and Sp3 
    Gauba, G; Parthasarathy, M; Nakada, Y; Fujii, T (EDP Sciences, 2001-07)
    We present an analysis of the UV (IUE) spectra of the central stars of Hb7 and Sp3. Comparison with the IUE spectrum of the standard star HD 93205 leads to a spectral classification of O3V for these stars, with an effective ...
  • The UV (IUE) spectrum of the planetary nebula PC 11 (HD 149427) 
    Parthasarathy, M; García-Lario, P; Pottasch, S. R; de Martino, D; Surendiranath, R (European Southern Observatory, 2000-03)
    The UV spectrum of PC 11 is found to show variations in the strength of the O III] 1666Å , N III] 1750Å and C III] 1909Å emission lines. The detection of continuum emission in the wavelength interval 2650Å to 3200Å indicates ...
  • UV(IUE) spectra of hot post-AGB candidates 
    Gauba, G; Parthasarathy, M (The European Southern Observatory, 2003-09)
    Analysis of the low resolution UV(IUE) spectra (1150 to 3200 Å) of 15 hot post-AGB candidates is presented. The UV(IUE) spectra of 10 stars suggest partial obscuration of the hot stars due to circumstellar dust. The reddened ...
  • UVIT observations of UV-Bright stars in four Galactic Globular Clusters 
    Kumar, R; Pradhan, A. C; Parthasarathy, M; Ojha, D. K; Mohapatra, A; Murthy, J (Cambridge University Press, 2019-05)
    We have performed photometric analysis of four Galactic globular clusters (GGCs): NGC 4147, NGC 4590, NGC 5053 and NGC 7492 using far-UV and near-UV filters of the Ultraviolet Imaging Telescope (UVIT) on-board AstroSat. ...
  • UVIT study of UV bright stars in the globular cluster NGC 4147 
    Ranjan Kumar; Pradhan, A. C; Parthasarathy, M; Ojha, D. K; Mohapatra, Abhisek; Murthy, J; Cassisi, Santi (Indian Academy of Sciences, 2021-10)
    We present far ultraviolet (FUV) observations of globular cluster NGC 4147 using three FUV filters, BaF2 (F154W), sapphire (F169M), and silica (F172M) of Ultra-Violet Imaging Telescope (UVIT) on-board the AstroSat satellite. ...
  • Weak emission line [WELS] central stars of planetary nebulae are [WC]-PG1159 stars 
    Parthasarathy, M; Acker, A; Stenholm, B (European Southern Observatory, 1998-01)
    The characteristics of the spectra of weak emission line stars (WELS) are found to be very similar to that of [WC]-PG1159 and PG1159 objects. On the basis of the spectra we find 31 WELS central stars of planetary nebulae ...
  • Weak G-band stars on the H-R diagram: clues to the origin of the Li anomaly 
    Palacios, A; Parthasarathy, M; Bharat Kumar, Y; Jasniewicz, G (EDP Sciences, 2012-02)
    Aims. Weak G-band (WGB) stars are a rare class of cool luminous stars that present a strong depletion in carbon, but also lithium abundance anomalies that have been little explored in the literature since the first discovery ...
  • The Wilson-Bappu effect for Mg II k-line emission widths 
    Parthasarathy, M (D.Reidel Publishing, 1985)
    The existence of a tight linear correlation between the stellar absolute magnitude Mv and the Mg II k-line emission width log WMg II k (km s/sup-1) is confirmed using IUE high-resolution (0.2 Å) data for 100 late-type stars.

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