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Browsing by Author "Parthasarathy, M"

Browsing by Author "Parthasarathy, M"

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  • 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 ...
  • 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 ...

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