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Browsing IIAP Publications by Title

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  • Spectroscopic Studies of the Solar Corona III. Density Diagnostics Using the Infrared Lines of Fe XIII 
    Singh, J; Sakurai, Takashi; Ichimoto, K; Takeda, Aki (Astronomical Society of Japan, 2002)
    We have obtained spectrographic observations of several coronal regions in three emission lines (6374Å [Fe X ], 10747Å [Fe XIII ], and 10798Å [Fe XIII ]) simultaneously. The 25-cm coronagraph at Norikura Observatory and ...
  • Spectroscopic Studies of the Solar Corona. IV. Physical Properties of Coronal Structure 
    Singh, J; Ichimoto, K; Sakurai, T; Muneer, S (The American Astronomical Society, 2003-03)
    We obtained spectrographic observations of several coronal structures at the limb overlying the sunspot regions, simultaneously in the Fe XIV (5303 Å) and Fe X (6374 Å) emission lines on several days, and simultaneously ...
  • Spectroscopic studies of the southern Cepheid β Dor 
    Giridhar, S (Universidad Nacional Autonoma De Mexico, 1987-05)
    Fine analysis of the southern Cepheid β Dor has been conducted at different phases with the aim to derive atmospheric parameters at those phases. Atmospheric abundances have been derived for Fe group elements and s-process ...
  • Spectroscopic study of a few Herbig Ae/Be stars in young open clusters 
    Mathew, B; Subramaniam, A; Bhavya, B (Astronomical Society of India, 2010-03)
    In this article we give an overview of the developments in the field of spectral classification and its continued importance in the fields of stellar and galactic evolution. The extension of MK system to cool stars as well ...
  • Spectroscopic study of amethyst quartz in the ultraviolet and infrared regions 
    Bappu, M. K. V (Indian Association for the Cultivation of Science, 1953)
    In this paper a study is made of the absorption of light in the ultravia!rt end infrared regions in amethyst quartz. In the ultraviolet the presence of the V-band is masked by the presence of iron impurity and it is ...
  • Spectroscopic study of amethyst quartz in the visible region 
    Bappu, M. K. V (Indian Association for the Cultivation of Science, 1952)
    In this paper a detailed study is made of the absorption of light in the visible region by amethyst quartz. It is found that in the visible region, an absorption band, the so called F-band appears, which decreases in ...
  • Spectroscopic Study of Ba and CEMP-s Stars: Mass Distribution of AGB Progenitors 
    Goswami, P. P; Goswami, A (American Astronomical Society, 2023-04-01)
    We have performed detailed high-resolution spectroscopic analysis on seven metal-poor stars (BD+75 348, BD +09 3019, HD238020, HE0319–0215, HE0507–1653, HE0930–0018, HE1023–1504) and derived their atmospheric parameters ...
  • Spectroscopic study of Be-shell stars : 4 Her and 88 Her 
    Bhat, S. S; Paul, K. T; Subramaniam, A; Mathew, B (IOP Publishing, 2016-06)
    We present an optical spectroscopic study based on 41 spectr a of 4 Her and 32 spectra of 88 Her, obtained over a period of 6 months. We estimate the rotationa l velocity of these stars from He I lines in the blue ...
  • Spectroscopic study of CEMP-(s & r/s) stars: Revisiting classification criteria and formation scenarios, highlighting i-process nucleosynthesis 
    Goswami, P. P; Rathour, R. S; Goswami, A (EDP Sciences, 2021-05)
    Context. The origin of the enhanced abundances of both s- and r-process elements observed in a subclass of carbon-enhanced metal-poor (CEMP) stars, denoted CEMP-r/s stars, still remains poorly understood. The i-process ...
  • Spectroscopic Study of Four Metal-poor Carbon Stars from the Hamburg/ESO Survey: On Confirming the Low-mass Nature of Their Companions* 
    Shejeelammal, J; Goswami, A (American Astronomical Society, 2022-08-01)
    Elemental abundances of extrinsic carbon stars provide insight into the poorly understood origin and evolution of elements in the early Galaxy. In this work, we present the results of a detailed spectroscopic analysis of ...
  • Spectroscopic study of Herbig Ae/Be stars in the Galactic anti-centre region from LAMOST DR5 
    Nidhi, S; Mathew, Blesson; Shridharan, B; Arun, R; Anusha, R; Kartha, Sreeja S (Oxford University Press on behalf of Royal Astronomical Society, 2023-10)
    We study a sample of 119 Herbig Ae/Be stars in the Galactic anti-centre direction using the spectroscopic data from large sky area multi-object fiber spectroscopic telescope survey program. Emission lines of hydrogen ...
  • Spectroscopic study of stars with dusty disks 
    Sivarani, T; Parthasarathy, M (2004)
    We have selected several stars with far-IR (IRAS)fluxes indicating the presence of circumstellar dust shells and disks. In this paper we present an analysis of the spectra of these stars. In several of these stars we find ...
  • Spectroscopic study of the Carbon-Enhanced Metal-Poor star: HE 0110-0406 
    Meenakshi, P; Goswami, A; Doddamani, V. H (Societe Royale des Sciences de Liege, 2019-10)
    The halo system of the Milky way comprises the vast majority of the presently observed metal-poor ([Fe/H] <1.0) and very metal-poor ([Fe/H] <2.0) stars. A sizable fraction (~ 30%) of the metal-poor stars with carbon ...
  • A spectroscopic study of the hybrid pulsator Gamma Pegasi 
    Pandey, C. P; Morel, T; Briquet, M; Jayakumar, K; Bisht, S; Sanwal, B. B (Austrian Academy of Sciences Press, 2011-02)
    The recent detection of both pressure and high-order gravity modes in the clas- sical B-type pulsator γ Pegasi offers promising prospects for probing its internal structure through seismic studies. To aid further modelling ...
  • A spectroscopic study of the Scorpio-Centaurus association 
    Rajamohan, R (Indian Academy of Sciences, 1976-09)
    Rotational velocities for 112 members of the Scorpio-Centaurus association brighter than 8.5 magnitudes are derived from spectra obtained with a dispersion of 47 A/mm. Hydrogen and helium line intensities are determined ...
  • A Spectroscopic Study of the Solar Corona from Norikura and SOHO data 
    Raju, K. P; Sakurai, T; Ichimoto, K (International Astronomical Union, 2001)
    We report the results from a spectroscopic study of the solar corona, wherein, we examine some of the current problems in the corona, such as the plume-interplume differences in coronal holes, coronal loops in active regions ...
  • Spectroscopic study of two new super Li-rich red clump K giants 
    Raghubar, Singh; Reddy, B. E; Bharat Kumar, Y (Oxford University Press on behalf of the Royal Astronomical Society, 2019-01)
    In this paper, we report the discovery of two new super Li-rich K giants: HD 24960 and TYC 1751-1713-1. Based on high-resolution (R ≈ 60 000) spectroscopy, we have derived Li abundance of A(Li) ≈ 4.0 dex for both ...
  • Spectroscopic survey of ASAS eclipsing variables: search for chromospherically active eclipsing binary stars - I 
    Parihar, P. S; Messina, S; Bama, P; Medhi, B. J; Muneer, S; Velu, C; Ahmad, A (Royal Astronomical Society, 2009-05)
    We have started a spectroscopic survey to identify new chromospherically active components and low-mass pre-main sequence (PMS) stars in recently discovered All Sky Automated Survey (ASAS) eclipsing binaries. In this paper, ...
  • Spectroscopic survey of emission line stars in open clusters 
    Subramaniam, A; Mathew, B (Springer, 2010)
    We summarize a study of emission-line stars in young open clusters. The study was done in two phases. The first phase was the survey, where the emission stars in young open clusters were identified using the slitless ...
  • Spectroscopy of Be stars in young open clusters 
    Mathew, B; Subramaniam, A (Astronomical Society of India, 2010)
    A spectroscopic study of 152 Classical Be stars in 42 young open clusters was performed using medium resolution spectra in 3700-9000 A range, to understand the Be phenomenon. The Balmer decrement is found to have a ...

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