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Browsing by Author "Parthasarathy, M"

Browsing by Author "Parthasarathy, M"

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  • SPECTROSCOPY OF BRIGHT ALGOL-TYPE SEMI-DETACHED CLOSE BINARY SYSTEM HU TAURI (HR 1471) 
    Parthasarathy, M (Konkoly Observatory, 2018-01-23)
    Radial velocities of the primary component (B8V) of HU Tauri derived from the photographic spectra obtained during January 1974 to December 1974 and spectroscopic orbital elements from the analysis of the radial velocity ...
  • Spectroscopy of HD 168625 (IRAS 18184-1623) 
    García, L. P; Sivarani, T; Parthasarathy, M; Manchado, A (Kluwer Academic Publishers, 2001-08)
    HD 168625 (B9-A0 Ia) was classified as a post-AGB star and also as a luminous blue variable. We have analysed the high resolution optical spectra of HD 168625 and derived the atmospheric parameters and the chemical ...
  • Spectroscopy of IRAS sources with far IR colors similar to those of planetary nebulae 
    Reddy, B. E; Parthasarathy, M (Astronomical Society of India, 1993)
    Optical candidates of 17 unidentified IRAS sources with far-infrared colors similar to planetary nebulae have been detected on sky survey plates. Low resolution CCD spectra of seven optical candidates suggests that they ...
  • Spectroscopy of post-AGB a-supergiant HD 101584 (IRAS 11385-5517) 
    Sivarani, T; Parthasarathy, M; García, L. P; Manchado, A; Pottasch, S. R (Kluwer Academic Publishers, 2001-08)
    In the high resolution optical spectra we identified forbidden lines of [OI] and [CI], which indicate the presence of low excitation nebula. There are many emission lines due forbidden and permitted lines of neutral and ...
  • Spectroscopy of post-AGB candidate HD 331319 (IRAS 19475+3119) 
    Sivarani, T; Parthasarathy, M; García, L. P; Manchado, A (Kluwer Academic Publishers, 2001-08)
    HD 331319 is a F3 Ib star with a detached cold circumstellar dust shell with far-IR colours similar to planetary nebulae. From an analysis of high resolution spectra using LTE stellar atmospheric models, we have derived ...
  • Spectroscopy of post-AGB candidate IRAS 10215-5916 
    Sivarani, T; Parthasarathy, M; García, L. P; Manchado, A (Kluwer Academic Publishers, 2001-08)
    IRAS 10215-5916 was classified as a post-AGB star and also as a massive red supergiant. It was also found to be a spectroscopic binary. In our high resolution spectra we found molecular features from a cool star of Teff = ...
  • Spectroscopy of the post-AGB star HD 101584 (IRAS 11385-5517) 
    Sivarani, T; Parthasarathy, M; García-Lario, P; Manchado, A; Pottasch, S. R (The European Southern Observatory, 1999-06)
    From an analysis of the spectrum (4000 Ä to 8800 Ä) of HD 101584 it is found that most of the neutral and single ionized metallic lines are in emission. The forbidden emission lines of [OI] 6300 Ä and 6363 Ä and [CI] 8727 ...
  • SPIRITS catalog of infrared variables: identification of extremely luminous long period variables 
    Karambelkar, V. R; Adams, S. M; Whitelock, P. A; Kasliwal, M. M; Jencson, J. E; Boyer, M. L; Goldman, S. R; Masci, F; Cody, A. M; Bally, J; Bond, H. E; Gehrz, R. D; Parthasarathy, M; Lau, R. M; (SPIRITS Collaboration) (IOP Publishing, 2019-06-01)
    We present a catalog of 417 luminous infrared variable stars with periods exceeding 250 days. These were identified in 20 nearby galaxies by the ongoing SPitzer InfraRed Intensive Transients Survey survey with the Spitzer ...
  • SPIRITS: Uncovering Unusual Infrared Transients with Spitzer 
    Kasliwal, M. M; Bally, J; Masci, F; Cody, Ann Marie; Bond, H. E; Jencson, Jacob E; Tinyanont, S; Cao, Y; Contreras, C; Dykhoff, Devin A; Amodeo, Samuel; Armus, L; Boyer, Martha; Cantiello, Matteo; Carlon, Robert L; Cass, Alexander C; Cook, David; Corgan, David T; Faella, Joseph; Fox, O. D; Green, Wayne; Gehrz, R. D; Helou, G; Hsiao, Eric; Johansson, J; Khan, Rubab M; Lau, Ryan M; Langer, Norbert; Levesque, Emily; Milne, Peter; Mohamed, Shazrene; Morrell, N; Monson, Andy; Moore, Anna; Ofek, E. O; O' Sullivan, Donal; Parthasarathy, M; Perez, Andres; Perley, D. A; Phillips, Mark; Prince, Thomas A; Shenoy, Dinesh; Smith, Nathan; Surace, J; Van Dyk, Schuyler D; Whitelock, P. A; Williams, Robert (IOP Publishing, 2017-04-20)
    We present an ongoing, five-year systematic search for extragalactic infrared transients, dubbed SPIRITS—SPitzer InfraRed Intensive Transients Survey. In the first year, using Spitzer/IRAC, we searched 190 nearby galaxies ...
  • A study of K i 7699 Å and related shell lines during the recent eclipse of ϵ Aurigae 
    Muthumariappan, C; Parthasarathy, M; Leadbeater, R; Potravnov, I. S; Appakutty, M; Jayakumar, K (Oxford University Press on behalf of the Royal Astronomical Society, 2014-12-11)
    We report high-resolution (R = 30 000, 45 000 and 75 000) echelle and medium-resolution (R = 22 000 and 10 000) spectroscopic observations of the long-period, eclipsing binary ε Aurigae during the 2009 - 2011 eclipse. ...
  • 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 ...
  • Thirty Bright High Velocity B, A, and F Stars that may have Late-type Companions 
    Parthasarathy, M (American Astronomical Society, 2024-01)
    I found thirty high velocity stars that have large V ‑ K values compared to standard stars of similar spectral types indicating the possible presence of late-type companion stars. All these thirty stars are relatively ...
  • 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. ...

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