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Browsing by Author "Parthasarathy, M"

Browsing by Author "Parthasarathy, M"

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  • Photoelectric observations of V Crateris 
    Sanwal, N. B; Sarma, M. B. K; Vivekanand Rao, P; Parthasarathy, M (Osmania University, 1990-03)
    The short-period eclipsing binary V Crateris is observed in the B and V colors of Johnson and Morgan's UBV system with attention given to the results from comparison and check stars. Magnitude differences are listed, and ...
  • Photometric elements, absolute dimensions and evolutionary status of the eclipsing binary HU Tauri 
    Parthasarathy, M; Sarma, M. B. K; Vivekananda Rao, P (Astronomical Society of India, 1993)
    The photometric elements of HU Tauri are derived from an analysis of its B and V light curve using the Wilson and Devinney (1971) light curve synthesis method. The photometric elements suggest that HU Tauri is a semi-detached ...
  • Photometric elements, absolute dimensions and evolutionary status of the eclipsing binary HU Tauri (HR 1471) 
    Parthasarathy, M; Sarma, M. B. K; Vivekananda, Rao P (The European Southern Observatory, 1995-05)
    The photometric elements of HU Tauri are derived from an analysis of its blue and visual light curves using the Wilson & Devinney (1971) light curve synthesis method. The photometric elements suggest that HU Tauri is a ...
  • Photometry and low resolution spectroscopy of hot post-AGB candidates 
    Gauba, G; Parthasarathy, M; Kumar, B; Yadav, R. K. S; Sagar, R (The European Southern Observatory, 2003-06)
    We have obtained Johnson U, B, V and Cousins R, I photometry and low resolution spectra of a small sample of hot post-AGB candidates. Using the present data in combination with JHK data from 2MASS, infrared data from the ...
  • Photometry of HU Tauri 
    Parthasarathy, M; Sarma, M. B. K (D. Reidel Publishing Co., 1980-10)
    Photoelectric observations of the bright eclipsing binary system HU Tauri are presented. The observations were made with standardB andV filters. Observations made during the eclipses yielded six epochs of minimum light. A ...
  • Physical conditions and chemical abundances of the variable planetary nebula IC 4997 
    Danehkar, A; Parthasarathy, M (Oxford University Press on behalf of the Royal Astronomical Society, 2022-07)
    The planetary nebula (PN) IC 4997 is one of a few rapidly evolving objects with variable brightness and nebular emission around a hydrogen-deficient star. In this study, we have determined the physical conditions and ...
  • Physical properties of the very young PN Hen3-1357 (Stingray Nebula) based on multiwavelength observations 
    Otsuka, M; Parthasarathy, M; Tajitsu, A; Hubrig, S (IOP Publishing, 2017-03-20)
    We carried out a detailed analysis of the interesting and important very young planetary nebula (PN) Hen3-1357 (Stingray Nebula) based on a unique data set of optical to far-IR spectra and photometric images. We calculated ...
  • Polarization Measurements of Post-Asymptotic Giant Branch Candidates and Related Stars 
    Parthasarathy, M; Jain, S. K; Sarkar, G (The American Astronomical Society, 2005-05)
    We have obtained UBVRI polarization measurements of 26 post-asymptotic giant branch (post-AGB) candidates and related stars. The extremely metal-poor post-AGB star HR 4049 has been observed several times. In most cases we ...
  • Polarization measurements of the luminous blue variable HR Carinae 
    Parthasarathy, M; Jain, S. K; Bhatt, H. C (European Southern Observatory, 2000-03)
    We have made BVRI polarization measurements of HR Car on ten occasions during the period JD 2447919 to JD 2449014. All our observations are on the rising part of the light curve. We find the presence of intrinsic variable ...
  • Possible proto-planetary nebulae 
    Parthasarathy, M (Cambridge University Press, 1989)
    IRAS data for high-galactic-latitude F supergiants, a few luminous F-G stars, and a few peculiar (forbidden) emission-line stars reveal they have dust shells with characteristics similar to those observed in planetary ...
  • Possible young stellar objects in the region of the Cygnus OB2 (VI Cygni) association from IRAS observations 
    Parthasarathy, M; Jain, S. K; Bhatt, H. C (EDP Sciences, 1992-12)
    Several massive young stellar objects are found from an analysis of the 12- to 100-micron flux data of IRAS sources in the region of the Cyg OB2 association. Sixty-four sources with positive spectral indices and steeply ...
  • Post-AGB A-F supergiant stars 
    Parthasarathy, M; Reddy, B. E (Astronomical Society of India, 1993)
    We have searched the IRAS Polar Stratospheric Clouds (PSC) for dust shells around A-F supergiant stars similar to the high galactic latitude A-F supergiants with circumstellar dust shells. We have found that HD 114855 ...
  • Post-Agb Candidates 
    Parthasarathy, M (Astronomical Society of the Pacific, 1993-01)
  • The puzzling high velocity G5 supergiant star HD 179821: new insight from Gaia DR2 data 
    Parthasarathy, M; Jasniewicz, G; Thevenin, F (Springer, 2019-01)
    HD 179821 is classified as G5 Ia star. From the IRAS colors and spectral energy distributions it was classified as a post-AGB star. But some studies classify it as a massive (30 to 19 M⊙) post-red supergiant evolving to ...
  • Quantitative classification of [WC] nuclei of Planetary Nebulae 
    Acker, A; Parthasarathy, M; Leindecker, W; Koeppen, J; Stenholm, B (International Astronomical Union, 1997)
  • The r- and s-process nuclei in the early history of the galaxy - HD 122563 
    Sneden, C; Parthasarathy, M (American Astronomical Society, 1983-04)
    Atomic nuclei generated by s(low) and r(apid) fluxes of neutrons carry important information about the very late stages of stellar evolution in the Galaxy. The classic method of tracing the stellar nucleosynthesis sites ...
  • Radiative Transfer Modelling of Dust in IRAS 18333–2357: The only planetary nebula in the metal-poor globular cluster M22 
    Muthumariappan, C; Parthasarathy, M; Ita, Y (Oxford University Press on behalf of the Royal Astronomical Society, 2013-10-11)
    We report results from our 1-D radiative transfer modelling of dust in the hydrogen-deficient planetary nebula IRAS 18333–2357 located in the globular cluster M22. A spectral energy distribution was constructed from ...
  • Radiative Transfer Modelling of Dust in the M22 PN IRAS 18333-2357 
    Muthumariappan, C; Parthasarathy, M; Ita, Y (Astronomical Society of the Pacific, 2015-08)
    We report results from our 1-D radiative transfer modelling of dust in the hydrogen-deficient planetary nebula IRAS 18333-2357 and discuss the properties of classical-grain and very small-grain populations of this PN.
  • Radiative Transfer Models of Dust Shells Around Post-AGB Stars 
    Surendiranath, R; Parthasarathy, M; Varghese, B. A (Springer, 2002-09)
    We present a radiative transfer analysis of circumstellar dust shells around the Post-AGB stars HD 179821, HD 56126, HD 101584 and early R star HD 100764, using the code DUSTY. Parameters like mass-loss, shell inner radius, ...
  • Red and blue stars in the direction of the Large Magellanic Cloud 
    Parthasarathy, M (International Astronomical Union, 1978)
    The Large Magellanic Cloud has been surveyed on ultralow dispersion (10,000 A/mm) plates taken with the 102-centimeter reflector at Kavalur. Many new red and blue stars were found. The LMC bar was found to have a strong ...

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