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Browsing by Author "Parthasarathy, M"

Browsing by Author "Parthasarathy, M"

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  • Line identifications of type I supernovae: on the detection of Si II for these hydrogen-poor events 
    Parrent, J. T; Milisavljevic, D; Soderberg, A. M; Parthasarathy, M (IOP Publishing, 2016-03)
    Here we revisit line identifications of type I supernovae (SNe I) and highlight trace amounts of unburned hydrogen as an important free parameter for the composition of the progenitor. Most one-dimensional stripped-enve ...
  • Lithium abundances for early F stars: new observational constraints for the Li dilution 
    Jasniewicz, G; Recio-Blanco, A; de Laverny, P; Parthasarathy, M; De Medeiros, J. R (EDP Sciences, 2006-07)
    Aims.To investigate any correlation between Li abundances and rotational velocities among F-G evolved stars, we study a large sample of early F stars from the Bright Star Catalogue (BSC), most of them classified in the ...
  • Lithium and rotation in F and G dwarfs and subgiants 
    Mallik, S. G. V; Parthasarathy, M; Pati, A. K (The European Southern Observatory, 2003-10)
    Lithium abundances have been determined in 127 F and G Pop I stars based on new measurements of the equivalent width of the 6707 Å Li I line from their high resolution CCD spectra. Distances and absolute magnitudes of these ...
  • The lithium in weak G-band stars 
    Parthasarathy, M; Kameswara Rao, N (D. Reidel Publishing Co., 1980-11)
    The lithum abundance in weak G-band stars is found to be linearly correlated with CH deficiency. Weak G-band stars with a high Li abundance are found to show relatively least carbon deficiency, while the stars with a ...
  • Low resolution spectroscopy of hot post-AGB candidates 
    Parthasarathy, M; Vijapurkar, J; Drilling, J. S (EDP Sciences, 2000-08)
    Spectral types are determined from low resolution optical spectra of 40 IRAS sources with far-infrared colours similar to planetary nebulae. The presence of circumstellar dust, high galactic latitude, and early supergiant ...
  • Low resolution spectroscopy of IRAS sources with PN like IR colours 
    Vijapurkar, J; Parthasarathy, M; Drilling, J. S (Astronomical Society of India, 1998)
  • Low resolution spectroscopy of ISOGAL sources: Search for early-type stars with infrared excess 
    Schultheis, M; Parthasarathy, M; Omont, A; Cohen, M; Ganesh, S; Sevre, F; Simon, G (E D P Sciences, 2002-05)
    An analysis of low resolution spectra and infrared data of 29 ISOGAL-DENIS sources with mid-IR excess is presented. Eight ISOGAL sources from our sample with 7-15 mu m excesses are found to be B and A-type stars, some of ...
  • Low resolution spectroscopy of selected Algol systems 
    Shanti Priya Devarapalli; Rukmini Jagirdar; Parthasarathy, M; Sahu, D. K; Mohan, V; Bhatt, B. C; Thomas, V. S (Springer, 2018-04)
    The analysis of spectroscopic data for 30 Algol-type binaries is presented. All these systems are short period Algols having primaries with spectral types B and A. Dominant spectral lines were identified for the spectra ...
  • LS II +34 deg 26 is a low-mass post-asymptotic giant branch B supergiant and not a massive Population I B star located near the outer edge of the galaxy 
    Parthasarathy, M (American Astronomical Society, 1993-09-10)
    LS II +34 deg 26 is an 11th magnitude low-gravity, high-velocity and high Galactic latitude B1.5 Ia-Iabe supergiant star. It is found to be an IRAS source with far IR colors, flux distribution, and dust shell parameters ...
  • MG II emission of Pop. 2 long-period Cepheids 
    Parthasarathy, M; Parsons, S. B (1984-12)
    The Population II Cepheid pulsational variables AL Vir (P = 10.3 days) and W Vir (P = 17.3 days) were observed with IUE at two phases each. Only low-dispersion mid-UV exposures were feasible, but were sufficient to show a ...
  • Morpho-kinematic and photoionization models of the multipolar structures in planetary nebula NGC 6572 
    Bandyopadhyay, Rahul; Das, Ramkrishna; Parthasarathy, M; Kar, Subhajit (Oxford University Press on behalf of Royal Astronomical Society, 2023-09)
    We have studied planetary nebula (PN) NGC 6572 through 3D morpho-kinematic and photoionization modelling. The 3D morphology is reconstructed from the Hubble Space Telescope images in different narrow-band filters and ...
  • A multiwavelength study of LS II+34 26: a hot post-AGB star in the process of becoming a planetary nebula 
    Garcia-Lario, P; Parthasarathy, M; de Martino, D; Sanz Fernandez de Cordoba, L; Monier, R; Manchado, A; Pottasch, S. R (European Southern Observatory, 1997-10)
    We present the results from a multiwavelength analysis of LS II+34 26, recently identified as a low mass post-AGB star and not a massive population I B-type star, as previously thought. We confirm that the central star is ...
  • A multiwavelength study of the Stingray Nebula; properties of the nebula, central star, and dust 
    Otsuka, M; Parthasarathy, M; Tajitsu, A; Hubrig, S (IOP Publishing, 2016-07)
    We performed a detail chemical abundance analysis and photo-ionization modeling of the Stingray Nebula (Hen3-1357, Parthasarathy et al. 1993[1]) to more characterize this PN. We calculated nine elemental abundances using ...
  • The nature of the Stingray nebula from radio observations 
    Harvey-Smith, L; Hardwick, J. A; De Marco, O; Parthasarathy, M; Gonidakis, I; Shaila Akhter; Cunningham, M; Green, J. A (Oxford University Press on behalf of the Royal Astronomical Society, 2018-09)
    We have analysed the full suite of Australia Telescope Compact Array data for the Stingray planetary nebula. Data were taken in the 4–23 GHz range of radio frequencies between 1991 and 2016. The radio flux density of the ...
  • Nebular emission lines in IRAS 10215-5916 
    Garcia-Lario, P; Manchado, A; Parthasarathy, M; Pottasch, S. R (European Southern Observatory, 1994-05)
    From low and high resolution spectroscopic observations of IRAS 10215-5916 we have discovered the presence of nebular emission lines in this G-type supergiant star in the post-AGB stage. From its high resolution spectrum ...
  • New determination of abundances and stellar parameters for a set of weak G-band stars 
    Palacios, A; Jasniewicz, G; Masseron, T; Thevenin, F; Itam-Pasquet, J; Parthasarathy, M (EDP Sciences, 2016-03)
    Context. Weak G -band (wGb) stars are a very peculiar class of red giants; th ey are almost devoided of carbon and often present mild lithium enrichment. Desp ite their very puzzling abundance pa tterns, very few ...
  • On the discovery of K I 7699 Å line strength variation during the 1982–1984 eclipse of ε Aurigae 
    Parthasarathy, M (Elsevier B.V, 2017-02)
    The discovery of K I 7699 Å line strength variations during the 1982–1984 eclipse of ε Aurigae is described. The equivalent widths and radial velocities of the K I 7699 Å line derived from spectra obtained during 1981 ...
  • On the progenitor of sup ernova 1987A 
    Parthasarathy, M; Branch, D; Jeffery, D. J (Astronomical Society of India, 2006-12)
    A previously unpublished ultralow­dispersion spectrum of Sand- uleak -69 202, the stellar progenitor of SN 1987A, is presented and the uncertain presupernova evolution of Sanduleak -69 202 is discussed.
  • On the progenitor of supernova 1987 A 
    Parthasarathy, M; Branch, D; Baron, E; Jeffery, D. J (Astronomical Society of India, 2006-12)
    A previously unpublished ultralow-dispersion spectrum of Sand- uleak -69 202, the stellar progenitor of SN 1987A, is presented and the uncertain presupernova evolution of Sanduleak -69 202 is discussed.
  • Orbit of the spectroscopic binary B Persei 
    Rajamohan, R; Parthasarathy, M (Indian Academy of Sciences, 1975-04)
    Spectroscopic orbital elements are derived for the close binary system b Persei on the basis of forty spectrograms. The period is redetermined as 1.527360 days, and variations in the orbital elements are confirmed by ...

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