IIA Institutional Repository

Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

Sort by: Order: Results:

  • TANSPEC: TIFR-ARIES Near-infrared Spectrometer 
    Sharma, Saurabh; Ojha, Devendra. K; Ghosh, Arpan; Ninan, Joe. P; Ghosh, Supriyo; Ghosh, Swarna. K; Manoj, P; Naik, Milind. B; D'Costa, Savio, L. A; Reddy, B. Krishna; Nanjappa, Nandish; Pandey, Rakesh; Sinha, Tirthendu; Panwar, Neelam; Susmitha, A; Kaur, Harmeen; Sahu, Sanjit; Bangia, Tarun; Poojary, Satheesha S; Jadhav, Rajesh. B; Bhagat, Shailesh. B; Meshram, Ganesh. S; Shah, Harshit; Rayner, John. T; Toome, Douglas. W; Sandimani, Pradeep. R (IOP Publishing Ltd on behalf of the Astronomical Society of the Pacific, 2022-08)
    We present the design and performance of the TANSPEC, a medium-resolution 0.55–2.5 μm cryogenic spectrometer and imager, now in operation at the 3.6 m Devasthal Optical Telescope (DOT), Nainital, India. The TANSPEC provides ...
  • Target selection for the SDSS-III marvels survey 
    Paegert, M; Stassun, K. G; De Lee, N; Pepper, J; Fleming, S. W; Sivarani, T; Mahadevan, S; Mack, C. E; Dhital, S; Hebb, L; Ge, J (IOP Publishing, 2015-06)
    We present the target selection process for the Multi-object APO Radial Velocity Exoplanets Large-area Survey (MARVELS), which is part of the Sloan Digital Sky Survey (SDSS) III. MARVELS is a medium-resolution (R ∼ 11,000) ...
  • TAUVEX flight calibrations: Plans and challenges 
    Safonova, M; Shalima, P; Murthy, J (Astronomical Society of India, 2009-06)
    The operational tasks for the Performance Verification (PV) and calibration phase in the first year of TAUVEX operation are presented. The new challenges regarding the possible reduction in sensitivity are outlined and are ...
  • TAUVEX---UV observations from geosynchronous orbit 
    Murthy, J; Safonova, M; Mohan, Rekhesh; Gopakumar, P (Astronomical Society of India, 2007-06)
    The T Observatory consists of three identical co-aligned telescopes operating in several bands in the 1200-3500, rmAA bandpass from geostationary orbit. The major science objectives of T are (a) searches for QSOs and AGNs ...
  • TAUVEX: status in 2011 
    Brosch, N; Murthy, J (Springer, 2011-09)
    We present a short history of the TAUVEX instrument, conceived to provide multi-band wide-field imaging in the ultraviolet, emphasizing the lack of sufficient and aggressive support on the part of the different space ...
  • TCP J18224935-2408280: a symbiotic star identified during outburst 
    Sonith, L. S; Kamath, U. S (Oxford University Press on behalf of Royal Astronomical Society, 2023-12)
    TCP J18224935-2408280 was reported to be in outburst on 2021 May 19. Follow-up spectroscopic observations confirmed that the system was a symbiotic star. We present optical spectra obtained from the Himalayan Chandra ...
  • A technique for measurement of rotational frequency 
    Das, G. C (D. Reidel Publishing Co., 1979-12)
    On the basis of Chandrasekhar's proposition that the Coriolis force has an influence on the magnetohydrodynamic waves excited in cosmic phenomena, a simple approximate formula determining the rotational frequency from the ...
  • Telescope drive requirements and design of a Microcontroller based drive and display system 
    Chinnappan, V (Indian Institute of Astrophysics, Bangalore, 1993)
    Optical telescope is a precision instrument which gives images of stars and galaxies when the telescope is pointed towards them. To design a good telescope drive, the requirements of a good telescope is to be well defined. ...
  • Temperate Earth-sized planets transiting a nearby ultracool dwarf star 
    Gillon, M; Jehin, E; Lederer, S. M; Delrez, L; De Wit, J; Burdanov, A; Van Grootel, V; Burgasser, A. J; Triaud, A. H. M. J; Opitom, C; Demory, Brice-Olivier; Sahu, D. (Nature Publishing Group, 2016-05)
    Star-like objects with effective temperatures of less than 2,700 kelvin are referred to as ‘ultracool dwarfs’1. This heterogeneous group includes stars of extremely low mass as well as brown dwarfs (substellar objects ...
  • Temperature and emission-line structure at the edges of H II regions 
    Mallik, D. C. V (American Astronomical Society, 1975-04)
    Models of ionization fronts located at the edges of expanding H II regions are presented. These fronts are of the weak D-type and are preceded by shocks in the H I clouds. Since the energy input time is smaller than the ...
  • Temperature at the poles and at the equator of the sun 
    Das, A. K; Abhyankar, K. D (Elsevier, 1955)
    The equivalent widths of the g and K lines are measured at the pole and at the equator of the Sun during a period of minimum solar activity. The difference of temperature between pole and equator is evaluated by Woolley's ...
  • Temperature of the F region of the ionosphere over Kodaikanal 
    Venugopal, V. R (Manager of Publications Civil Lines Delhi, 1960-04)
    Night temperature of the F region of the ionosphere over Kodaikanal has been computed by the scale height method for the months of June and December. The temperature at a height of 300km is found to be round about 1200°K. ...
  • Temperature profiles of accretion discs around rapidly rotating strange stars in general relativity: A comparison with neutron stars 
    Bhattacharyya, S; Thampan, A. V; Bombaci, I (EDP Sciences, 2001-06)
    We compute the temperature profiles of accretion discs around rapidly rotating strange stars, using constant gravitational mass equilibrium sequences of these objects, considering the full effect of general relativity. ...
  • Temperature Profiles of Accretion Disks around Rapidly Rotating Neutron Stars in General Relativity and the Implications for Cygnus X-2 
    Bhattacharyya, S; Thampan, A. V; Misra, R; Datta, B (The American Astronomical Society, 2000-10)
    We calculate the temperature profiles of (thin) accretion disks around rapidly rotating neutron stars (with low surface magnetic fields), taking into account the full effects of general relativity. We then consider a model ...
  • Temperature variability in X-ray bright points observed with Hinode/XRT 
    Kariyappa, R; DeLuca, E. E; Saar, S. H; Golub, L; Dam´e, L; Pevtsov, A. A; Varghese, B. A (EDP Science, 2011-02)
    Aims. Our aim is to investigate the variability in the temperature as a function of time among a sample of coronal X-ray bright points (XBPs). Methods. We analysed a 7-hour (17:00 UT - 24:00 UT) long time sequence of ...
  • Template-based classification of SDSS-GALEX point sources 
    Anjum, A; Mousumi Das; Murthy, J; Gudennavar, S. B; Rajesh, G; Bubbly, S. G (Indian Academy of Sciences, 2018-10)
    We have classified a sample of 37,492 objects from SDSS into QSOs, galaxies and stars using photometric data over five wave bands (u, g, r, i and z) and UV GALEX data over two wave bands (near-UV and far-UV) based on a ...
  • Temporal and Latitudinal Variations in Ca-K Plage and Network Area: An Implication for Meridional Flows 
    Priyal, M; Singh, J; Ravindra, B; Sindhuja, G (American Astronomical Society, 2023-02-20)
    The Ca-K spectroheliograms obtained at the Kodaikanal observatory are used to generate a uniform time series using the equal-contrast technique for studying the long- and short-term variations in the solar chromosphere. ...
  • Temporal and Latitudinal Variations of the Length-Scales and Relative Intensities of the Chromospheric Network 
    Raju, K. P (Oxford University Press on behalf of the Royal Astronomical Society, 2018-08)
    The Calcium K spectroheliograms of the Sun from Kodaikanal have a data span of about 100 yr and covers over nine solar cycles. The Ca line is a strong chromospheric line dominated by chromospheric network and plages which ...
  • Temporal and spatial variations of the quiet upper chromosphere from SOHO/SUMER observations of hydrogen Lyman lines 
    Kariyappa, R; Varghese, B. A; Curdt, W (EDP Sciences, 2001-08)
    We have analyzed a time series of spectra in the hydrogen Lyman lines and the Lyman continuum obtained by the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer on the SOlar Heliospheric Observatory ...
  • Temporal asymmetry in aerosol optical characteristics: A case study at a high-altitude station, Hanle, in Ladakh region 
    Shantikumar, N. S; Bagare, S. P; Srivastava, A. K; Kanawade, V. P; Rajendra, B. S; Padhy, S. K (Elsevier, 2014-12)
    Diurnal features of aerosol optical depth (AOD) at a high-altitude station, Hanle (4500 m amsl) in the western Himalayas, were studied using direct/diffuse solar irradiance measurement from a Skyradiometer (Prede) during ...

Search DSpace


Browse

My Account