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Browsing by Author "Parthasarathy, M"

Browsing by Author "Parthasarathy, M"

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  • 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 ...
  • Red and reddened stars in the region of Cygnus OB2 (VI Cygni) association 
    Parthasarathy, M; Jain, S. K (European Southern Observatory, 1995-06)
    From an ultra-low dispersion spectroscopic survey of the Cyg OB2 association several red and reddened stars are detected. Most of these stars appear to be reddened early-type stars belonging to the Cygnus OB2 association. ...
  • Refining the Fundamental Parameters of the 3 Post-AGB Stars: HR 4049, HD 52961 and HD 133656 Using Improved Model Atmospheres 
    Monier, R; Parthasarathy, M (Kluwer Academic Publishers, 1998)
  • RS CVn-type variables. I - Photometry of HR 1099 
    Parthasarathy, M; Raveendran, A. V; Mekkaden, M. V (D. Reidel Publishing Co., 1981-01)
    Photometric observation of HR 1099 inV andB obtained on 18 nights between January and March 1977 is presented. The amplitude of the asymmetric light curve is found to be 0m.10±0m.004 both inV andB. On three occasions—namely, ...
  • SAO 244567 - A post-AGB star which has turned into a planetary nebula within the last 40 years 
    Parthasarathy, M; Garcia-Lario, P; Pottasch, S. R; Manchando, A; Clavel, J; de Martino, D; Van de Steene, G. C. M; Sahu, K. C (European Sothern Observatory, 1993-01)
    SAO 244567 (Hen 1357 = CPD -59 deg 6926 = IRAS 17119-5926) is an IRAS source with far infrared colors and flux distribution similar to those of planetary nebulae. The IUE ultraviolet spectra obtained in July 1988 and April ...
  • Search for Lithium-Rich Stars Among G-K Giants with IR-excess 
    Jasniewicz, G; Parthasarathy, M; de Laverny, P; Thevenin, F; Mauron, N; Chadid, M (International Astronomical Union, 2000)
    We report here new results about a search for Li- rich stars among 52 G-K giant stars which are known to have near IR excess. Eleven giants have been found to have loge (Li)≥ 1.0. Five are new Li-rich stars. We suspect ...
  • A search for solar-like oscillations in the stars of M67 with CCD ensemble photometry on a network of 4 M telescopes 
    Gilliand, R. L; Brown, T. M; Kjeldsen, H; McCarthy, J. K; Peri, M. L; Belmonte, J. A; Vidal, I; Cram, L. E; Palmer, J; Frandsen, S; Parthasarathy, M; Petro, L; Schneider, H; Stetson, P. B; Weiss, W. W (American Astronomical Society, 1993-12)
    Results are presented from a large observational project directed toward the detection of solar-like oscillations in an ensemble of open cluster stars. Seven groups collaborated in 1992 January to observe twelve stars in ...
  • The Secondary Components of Algol Systems 
    Parthasarathy, M (Indian Institute of Astrophysics, Bangalore, 1979-01)
  • SiO maser survey of AGB stars in the North Galactic Cap 
    Ita, Y; Deguchi, S; Fujii, T; Kameya, O; Miyoshi, M; Nakada, Y; Nakashima, J; Parthasarathy, M (EDP Sciences, 2001-09)
    A SiO maser survey in the J=1-0, v=1 and 2 transitions has been made for IRAS sources in the North Galactic Cap b > 30o) with the Nobeyama 45 m radio telescope. The sources were selected on the basis of their IRAS 12/25-μm ...
  • Spectroscopic observations of first ISOGAL sources 
    Ojha, D. K; Sivarani, T; Parthasarathy, M; Omont, A; Ganesh, S; Simon, G (Astronomical Society of India, 2000)
    Infrared Space Observatory Galactic (ISOGAL) survey at 7 and 15 μm of ~ 22 deg2 of the inner galactic disk and bulge, has detected several hundred thousand sources. Combining ISOGAL survey with I, J, H, Ks data of DENIS ...

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