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  • Spectropolarimetric Observations of Solar Noise Storms at Low Frequencies 
    Mugundhan, V; Ramesh, R; Kathiravan, C; Gireesh, G. V. S; Aathira Hegde (Springer, 2018-03)
    "A new high-resolution radio spectropolarimeter instrument operating in the frequency range of 15 – 85 MHz has recently been commissioned at the Radio Astronomy Field Station of the Indian Institute of Astrophysics ...
  • Spectropolarimetry of Active Regions on the Sun 
    Nagaraju, K (Indian Institute of Astrophysics, 2008-06)
  • Spectropolarimetry of an active region at the photosphere and chromosphere 
    Nagaraju, K; Sankarasubramanian, K; Rangarajan, K. E (Astronomical Society of the Pacific, 2009-06)
    Initial results on the simultaneous spectropolarimetric observations of an active region at the photosphere and chromosphere are presented. For this purpose, the Fe I line at λ6569 and the H I at λ6563 (Hα) are used. ...
  • Spectropolarimetry package for visible emission line coronagraph (VELC) on board Aditya-L1 mission 
    Venkata Suresh, Narra; Prasad, B. R; Singh, J (Springer, 2022-02)
    One of the unique features of Visible Emission Line Coronagraph (VELC) on board Aditya-L1 mission is spectropolarimetric observations in coronal emission line centred at 10747 Å. Spectropolarimetric observations at 10747 ...
  • Spectropolarimetry with the NLST 
    Sankarasubramanian, K; Hasan, S. S; Rangarajan, K. E (Springer, 2010)
    India’s National Large Solar Telescope (NLST) will provide opportunities to observe the Sun with high spatial, spectral, and polarimetric resolution. The large aperture also enables high-cadence spectropolarimetry with ...
  • Spectroscopic analysis of four post-AGB candidates 
    Molina, R. E; Giridhar, S; Pereira, C. B; Arellano Ferro, A; Muneer, S (Institute de Astronomia, 2014-10)
    We have done a detailed abundance analysis of four unexplored cand idate post- Asymptotic Giant Branch(AGB) stars IRAS 13110- 6629, IRAS 175 79 - 3121, IRAS 18321- 1401 and IRAS 18489- 0629 using high resolution spectra. ...
  • Spectroscopic and geometrical evolution of the ejecta of the classical nova ASASSN-18fv 
    Pavana, M; Raj, A; Bohlsen, T; Anupama, G. C; Gupta, R; Selvakumar, G (Oxford University Press on behalf of the Royal Astronomical Society, 2020-05)
    The optical spectroscopic observations of ASASSN-18fv observed from 2018 March 24 to 2019 January 26 are presented. The optical spectra are obtained from Mirranook, Vainu Bappu, and South African Astronomical observatories. ...
  • Spectroscopic and geometrical evolution of the ejecta of the classical nova ASASSN-18fv 
    Pavana, M; Raj, A; Bohlsen, T; Anupama, G. C; Gupta, R; Selvakumar, G (Oxford University Press on behalf of the Royal Astronomical Society, 2020-06)
    The optical spectroscopic observations of ASASSN-18fv observed from 2018 March 24 to 2019 January 26 are presented. The optical spectra are obtained from Mirranook, Vainu Bappu, and South African Astronomical observatories. ...
  • Spectroscopic binary orbits and MK morphological studies of some AM stars 
    Sreedhar Rao, S (Astronomical Society of India, 1993)
    The metallic-line A type stars (Am) on the main sequence are known to be largely the members of binary systems and therefore yield periods. Due to their small equatorial radial velocities, they display sharp spectral lines ...
  • Spectroscopic charaterization of FHLC stars from the Hamburg/ESO survey and a newly found HdC star 
    Goswami, A (Astronomical Society of India, 2012)
    The sample of candidate faint high latitude carbon (FHLC) stars chosen from the Hamburg/ESO survey is a potential source to search for objects of rare types. From medium resolution spectral analyses of about 250 objects ...
  • Spectroscopic evolution of Nova LW Serpentis 1978 during its early decline 
    Prabhu, T. P; Anupama, G. C (Indian Academy of Sciences, 1987-12)
    Spectroscopic observations of Nova LW Serpentis have been obtained in 1978 during its decline from V of about 9.0 to V of about 10.2. It is found that the spectrum and its evolution compare well with those of a typical ...
  • Spectroscopic Investigation of Nebular Gas (SING): a dedicated NUV spectrograph to study extended objects 
    Bharat Chandra; Nair, B. G; Suresh, Ambily; Prabha, C. S; Mathew, J; Nirmal, K; Sarpotdar, Mayuresh; Mohan, R; Safonova, M; Sriram, S; Murthy, J (SPIE--The International Society for Optical Engineering, 2019-01)
    SING is a near ultraviolet (NUV) spectrograph with a size close to 6U CubeSat form-factor. The spectrograph operates in the wavelength range from 1800 Å to 3000 Å, with a spectral resolution of 2 Å at the central wavelength. ...
  • Spectroscopic Investigation Of Nebular Gas (SING): a dedicated NUV spectrograph to study extended objects from a stable space platform 
    Chandra, B; Sachkov, Mikhail; Shanti Prabha, C; Prakash, A; Nair, B. G; Safonova, M; Rai, R; Mohan, Rekhesh; Murthy, J; Shmagin, Vladimir (SPIE-The International Society for Optical Engineering, 2020-12)
    One of the most exciting parts of the astrophysical spectrum is the ultraviolet, with a greater density of absorption and emission lines than any other part of the electromagnetic spectra. Our primary science objective ...
  • Spectroscopic Investigation of Nebular Gas (SING): general objectives and preliminary optical layout 
    Sachkov, M. E; Chandra, B; Murthy, J; Shmagin, V. E; Prabha, Sh; Prakash, A; Nair, B. G; Safonova, M. V; Rai, R; Mohan, R (Institute of Astronomy of the Russian Academy of Sciences, 2020-12)
    The ultraviolet spectral subdiapasons, both near UV (180─300 nm) and far UV (115─180 nm), are highly requested by astrophysicists. The successful space missions like IUE, HST, GALEX and others provided scientists with ...
  • Spectroscopic investigations of planetary nebulae 
    Muthumariappan, C (Astronomical Society of India, 2001)
    The morphologies of three selected asymmetrical planetary nebulae (PNe), namely NGC 4361, NGC 1514 and NGC 246, were studied using spatio-kinematic observations made with an Imaging Fabry-Perot Spectrometer. From the 3D ...
  • Spectroscopic monitoring of symbiotic stars from the Vainu Bappu Observatory 
    Anupama, G. C; Mikołajewska, J (Astronomical Society of the Pacific, 2003)
    We present here the preliminary results of the long term monitoring of the optical spectrum of symbiotic stars from the Vainu Bappu Observatory. Spectra of EG and, AX Per, BX Mon, RX Pup, Rw Pup, RW Hya, AS 210, and StHα ...
  • Spectroscopic monitoring of the symbiotic star BX monocerotis 
    Anupama, G. C; Kamath, U. S; Gurugubelli, U. K; Mikołajewska, J (Vilnius University and the Lithuanian Astronomical Union, 2012)
    Low resolution optical spectra of the symbiotic star BX Monocerotis in the 3500--9000 A range obtained during 1999--2010 are described. The spectrum of BX Mon at all phases is dominated by the cool component, with a red ...
  • Spectroscopic Observation of Coronal Waves 
    Sakurai, T; Ichimoto, K; Raju, K. P; Singh, J (Springer, 2002-10)
    A time sequence over 80 min of coronal green-line spectra was obtained with a corona- graph at the Norikura Solar Observatory. Doppler velocities, line intensities, and line widths were derived through fitting a single ...
  • Spectroscopic Observation of Oscillations in the Corona During the Total Solar Eclipse of 22 July 2009 
    Singh, J; Hasan, S. S; Gupta, G. R; Nagaraju, K; Banerjee, D (Springer, 2011-05)
    We performed high resolution spectroscopy of the solar corona during the total solar eclipse of 22 July 2009 in two emission lines: the green line at 5303 Å due to Fe xiv and the red line at 6374 Å due to Fe x, simultaneously ...
  • Spectroscopic observations of delta orionis 
    Singh, M (Kluwer Academic Publishers, 1982-10)
    The H α profile in the spectrum of δ Orionis shows phase-dependent changes, with a period of variation equal to the orbital period fo the binary system. The profile shape changes from a normal absorption profile at zero ...

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