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Browsing Research Papers by Title

Browsing Research Papers by Title

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  • Three- colour photometry of TW CAS 
    Kandpal, C. D. (1975)
    Photoelectric elements of the system TW Cas have been determined in U,B and V filters. A refined period of 1ᵈ.428 324 77 has been given though no change in period is noticed. Spectroscopic elements given by struve have ...
  • Tight constraints on the existence of additional planets around HD 189733 
    Hrudkova, M.; Skillen, I.; Benn, C. R.; Gibson, N. P.; Pollacco, D.; Nesvorny, D.; Augusteijn, T.; Tulloch, S. M.; Joshi, Y. C. (2010)
    We report a transit timing study of the transiting exoplanetary system HD 189733. In total, we observed 10 transits in 2006 and 2008 with the 2.6-m Nordic Optical Telescope, and two transits in 2007 with the 4.2-m William ...
  • Time delay between H-alpha and soft x-ray emissions during solar flares 
    Verma, V. K.; Pande, M. C. (1985)
    A statistical analysis of time delay between H-alpha and soft x-ray (SXR) emissions at onset and peak respectively during solar flares is presented. We find that at the onset of flares SXR emission starts simultaneously ...
  • Time delay between Hα and hard X-ray emissions during implusive solar flares 
    Verma, V. K.; Pande, M. C. (1985)
    This investigation shows that statistically there are significant time delay between Hα and hard X-ray (HXR) emissions during solar flares; most impulsive flares produce HXR emissions up to ~1 min before and up to 2 min ...
  • Time resolved photometric and spectroscopic analysis of chemically peculiar star 
    Joshi, S.; Joshi, G. C.; Joshi, Y. C.; Aggrawal, R. (IAU, 2014)
    Here we present the report on the "Nainital-Cape survey" research project aiming to search for and study the pulsational variability of main-sequence chemically peculiar (CP) stars. For this study, the time-series photometric ...
  • Time-resolved photometric and spectroscopic analysis of the luminous Ap star HD 103498 
    Joshi, S.; Ryabchikova, T.; Kochukhow, O.; Sachkov, M.; Tiwari, S. K.; Chakradhari, N. K.; Piskunov, N. (2010)
    We present the results of the photometric and spectroscopic monitoring of the luminous Ap star HD103498. The time-series photometric observations were carried out on 17 nights using a three-channel fast photometer attached ...
  • TIRCAM2 camera interface on the side port of 3.6-m Devasthal Optical Telescope 
    Bhagat, Shailesh B.et.al; Reddy, B. Krishna; Nanjappa, Nadish; Bangia, Tarun; Shrama, Saurabh (Journal Astrophysical Astronomy, 2023-06)
    TIFR Near Infrared Imaging Camera-II (TIRCAM2) is being used at the 3.6-m Devasthal Optical Telescope (DOT) operated by Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, Uttarakhand, India. ...
  • TIRCAM2 fast sub-array readout mode for lunar occultation studies 
    Naik, Milind B.,et.al; Shrama, Saurabh; Ghosh, Arpan (Journal Astrophysical Astronomy, 2023-06)
    TIFR Near Infrared Imaging Camera-II (TIRCAM2) is being used at the Devasthal Optical Telescope (DOT) operated by Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, Uttarakhand, India. In addition ...
  • Top-of-atmosphere radiative cooling with white roofs: experimental verification and model-based evaluation 
    Salamanca, F. et. al.; Naja, M. (2012)
    We evaluate differences in clear-sky upwelling shortwave radiation reaching the top of the atmosphere in response to increasing the albedo of roof surfaces in an area of India with moderately high aerosol loading. Treated ...
  • The transience and persistence of high optical polarisation state in beamed radio quasars 
    Chand, Krishan; Krishna, Gopal; Omar, Amitesh; Chand, Hum; Bisht, P. S. (Publications of the Astronomical Society of Australia, 2023-02)
    We examine the long-term stability (on decade-like timescales) of optical ‘high polarisation’ (HP) state with popt > 3%, which commonly occurs in flat-spectrum (i.e., beamed) radio quasars (FSRQs) and is a prominent marker ...
  • A transit timing analysis of seven RISE light curves of the exoplanet system HAT-P-3 
    Gibson, N. P.; Pollacco, D. L.; Barros, S.; Benn, C.; Christian, D.; Hrudkova, M.; Joshi, Y. C.; Keenan, F. P.; Simpson, E. K.; Skillen, I.; Steele, I. A.; Todd, I. (2010)
    We present seven light curves of the exoplanet systemHAT-P-3, taken as part of a transit timing programme using the rapid imager to search for exoplanets instrument on the Liverpool Telescope. The light curves are analysed ...
  • TransitFit: combined multi-instrument exoplanet transit fitting for JWST, HST, and ground-based transmission spectroscopy studies 
    Hayes, J. J. C.; Priyadarshi, A.; Kerins, E.; Awiphan, S.; McDonald, I.; A-thano, N.; Morgan, J.S.; Humpage, A.; Charles, S.; Wright, M.; Joshi, Y. C.; Jiang, Ing-Guey; Inyanya, T.; Padjaroen, T.; Munsaket, P.; Chuanraksasat, P.; Komonjinda, S.; Kittara, P.; Dhillon, V. S.; Marsh, T. R.; Reichart, D. E.; Poshyachinda, S. (Monthly Notices of the Royal Astronomical Society, 2024-01)
    We present TRANSITFIT1, a package designed to fit exoplanetary transit light curves. TRANSITFIT offers multi-epoch, multi wavelength fitting of multi-telescope transit data. TRANSITFIT allows per-telescope detrending to ...
  • Transport effects on the vertical distribution of tropospheric ozone over the tropical marine regions surrounding India 
    Lal, S., et al.; Naja, M.; Sarangi, T. (American Geophysical Union, 2013)
    The measurements of vertical distribution of ozone have been made over the Bay of Bengal and the Arabian Sea in spring 2006 during a cruise campaign, namely, the Integrated Campaign for Aerosol, Gases and Radiation Budget. ...
  • Transport effects on the vertical distribution of tropospheric ozone over western India 
    Lal, S. et al.; Naja, M. (Wiley on behalf of the American Geophysical Union, 2014)
    In situ tropospheric ozone measurements by balloon-borne electrochemical concentration cell (ECC) sensors above Ahmedabad in western India from May 2003 to July 2007 are presented, along with an analysis of the transport ...
  • Triggered star formation and evolution of T-Tauri stars in and around bright-rimmed clouds 
    Chauhan, N.; Pandey, A. K.; Ogura, K.; Ojha, D. K.; Bhatt, B. C.; Ghosh, S. K.; Rawat, P. S. (2009)
    The aim of this paper is to quantitatively testify the ‘small-scale sequential star formation’ hypothesis in and around bright-rimmed clouds (BRCs). As a continuation of the recent attempt by Ogura et al., we have ...
  • The Tully–fisher relations of the Eridanus group of galaxies 
    Omar, A.; Dwarakanath, K. S. (2006)
    The Tully–Fisher (TF) or the luminosity–linewidth relations of the galaxies in the Eridanus group are constructed using the HI rotation curves and the luminosities in the optical and in the near-infrared bands. The slopes ...
  • The twin radio galaxy TRG J104454+354055 
    Krishna, Gopal, et.al.; Omar, Amitesh (Monthly Notices of the Royal Astronomical Society Letters, 2022-07)
    We report observations of a bright dumb-bellsystem of galaxies(z = 0.162) with the upgraded Giant Metrewave Radio Telescope (uGMRT), which show that each member of this gravitationally bound pair of galaxies hosts bipolar ...
  • Twisted surge of 1981 December 25 
    Verma, V. K. (1983)
    Photographic observations and the morphological behaviour of the surge prominence of importance class 1 recorded with the 0.7 Å passbands H-alphs filter on 1981 December 25 have been described. The surge was recorded both ...
  • Two types of softening detected in x-ray afterglows of Swift bursts: internal and external shock origins? 
    Qin, Y-P; Gupta, A. C.; Fan, J. H.; Lu, R-J (2008)
    The softening process observed in the steep decay phase of early x-ray afterglows of Swift bursts has remained a puzzle since its discovery. The softening process can also be observed in the later phase of the bursts and ...
  • Two-temperature accretion flows around strongly magnetized stars and their spectral analysis 
    Sarkar, Shilpa; Singh, Kuldeep; Chattopadhyay, Indranil; Laurent, Philippe (Monthly Notices of the Royal Astronomical Society, 2023-07)
    We investigate two-temperature accretion flows onto strongly magnetized compact stars. Matter is accreted in the form of an accretion disc upto the disc radius (rd), where, the magnetic pressure exceeds both the gas and ...

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