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Browsing Aryabhatta Research Institute of Observational Sciences by Title

Browsing Aryabhatta Research Institute of Observational Sciences by Title

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  • 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 ...
  • Two-Temperature Solution and Spectral Analysis of Flows Around Compact Objects 
    Sarkar, Shilpa (ARIES, Nainital, 2022-06-02)
    Black holes (BHs) are one of the most exotic objects found in the Universe. They fall into a class of astrophysical objects termed as compact objects. Apart from BHs, neutron stars (NSs) and white dwarfs (WDs) also fall ...
  • Type Ia supernovae SN 2013bz, PSN J0910 + 5003, and ASASSN-16ex: similar to 09dc-like? 
    Tiwari, S.; Chakradhari, N. K.; Sahu, D. K.; Anupama, G. C.; Kumar, B.; Sahu, K. R. (Monthly Notices of the Royal Astronomical Society, 2023-06)
    We present optical photometric and spectroscopic studies of three supernovae (SNe): SN 2013bz, PSN J0910 + 5003, and ASASSN-16ex (SN 2016ccj). UV–optical photometric data of ASASSN-16ex obtained with the Swift ...
  • Type IIP supernova SN 2004et: A multiwavelength study in X-ray, optical and radio 
    Misra, K.; Pooley, D.; Chandra, P.; Bhattacharya, D.; Ray, A. K.; Sagar, R.; Lewin, W. H. G. (2007)
    We present X-ray, broad-band optical and low-frequency radio observations of the bright type IIP supernova SN 2004et. The Chandra X-ray Observatory observed the supernova at three epochs, and the optical coverage spans ...
  • UBV CCD standards in two galaactic directions – II 
    Mohan, V.; Sanwal, B. B.; Paliwal, D. C.; Pandey, A. K.; Bhatt, B. C.; Robin, A. C. (1996)
    Using CCD observations, photometric magnitudes have been obtained in two galactic directions at intermediate latitude. A total of 7 sub-fields in one direction (l = 3°, b = 47°) have been observed leading to photometric ...
  • UBV CCD standards near 5C1 radio sources at intermediate galactic latitude – I 
    Mohan, V.; Ojha, D. K.; Bienayme, O.; Paliwal, D. C.; Pandey, A. K.; Robin, A. C.; Chareton, M.; Bhatt, B. C.; Sanwal, B. B.; Oblak, E.; Haywood, M.; Creze, M. (1994)
    Using CCD observations photometric magnitudes have been obtained in 18 sub-fields in a direction at intermediate galactic latitude (l = 170°, b = 45°) in a 14 deg² area. B and V magnitudes have been obtained for a total ...
  • UBV observations of RS Canum Venaticorum 
    Srivastava, J. B.; Kandpal, C. D. (1990)
    Photoelectric observations of eclipsing binary RS CVn carried out at Uttar Pradesh State Observatory Nainital, have been reported. The light curve shows wave-like distortion. Colours and magnitudes of RS CVn and comparison ...
  • UBV observations of the eclipsing binary FW monocerotis 
    Srivastava, J. B.; Kandpal, C. D. (1993)
    Photometric observations of FW Monocerotis in U, B, and V filter have been discussed. The depths of the primary minimum in UBV colours are 2.ᵐ63, 2.ᵐ17 and 1.ᵐ76, respectively. No variation in the period has been found and ...
  • UBV photometry of comet Swift-Tuttle (1992t) 
    Padalia, T. D.; Gupta, S. K.; Srivastava, R. K.; Chaubey, U. S. (1993)
    The comet Swift-Tuttle (1992t) was observed through UBV filters during twelve nights in December 1992.Magnitude variations of six circular zones from the centre ot the cometary dead have been given. On the night of 17 ...
  • UBV photometry of DX Aquarii 
    Srivastava, R. K.; Sinha, B. K. (1985)
    U, B, V photometry of the Eclipsing binary system DX Aqr has been presented for the first time. The period of the system comes out to be nearly half the period given by Strohmeier (1966) and a value of 0ͩ.472502 has been ...
  • UBV photometry of ER Vulpeculae 
    Srivastava, R. K.; Padalia, T. D.; Srivastava, J. B. (1991)
    UBV photometry of RS CVn- type eclipsing binary system ER Vulpeculae has been presented. The period comes out to be 0.ᵈ698093. The average depths of primary and secondary minima are, respectively,0.ᵐ21 and 0.ᵐ12. The colours ...
  • UBV photometry of RT Persei 
    Sanwal, B. B.; Chaubey, U. S. (1980)
    Photoelectric and absolute elements of the system RT per have been determined in U,B, and V filters. It is suggested that the primary star may be surrounded by a gascous disk.
  • UBV photometry of the eclipsing binary RZ Eridani 
    Srivastava, J. B.; Kandpal, C. D. (1988)
    U, B, and V observations of RZ Eri have been reported. COlours of comparison stars BD-10°994, BD-10°996 and of the variable RZ Eri have been presented. The observations of RZ Eri do not indicate the distortion wave in the ...
  • UBV photometry of two eclipsing binary stars 
    Chaubey, U. S.; Singh, M. (1984)
    UBV light curves of the eclipsing binary systems V364 Cas and MM Cas are presented. A total of eight photoelectric times of minimum light for these stars were derived. The UBV photometric data of V364 Cas that the orbital ...
  • UBVRI CCD photometric study of the open clusters Basel 4 and NGC 7067 
    Yadav, R. K. S.; Sagar, R. (2003)
    In this paper we present UBV RI CCD photometry in the region of two young open star clusters Basel 4 and NGC 7067 for the first time. Our sample consists of ~4000 stars down to V ~ 21 mag. Stellar surface density profile ...
  • UBVRI CCD photometry of the OB associations Bochum 1 and Bochum 6 
    Yadav, R. K. S.; Sagar, R. (2003)
    We report the first deep UBVRI CCD photometry of 2460 stars in the field of two poorly studied OB associations Bochum 1 and Bochum 6. We selected 15 and 14 probable members in Bochum 1 and Bochum 6 respectively using ...
  • Ultraviolet and infrared excess emission in Be stars 
    Goraya, P. S. (1986)
    Spectrophotometric observations of 26 Be stars are reported and analyzed in the wavelength range λ3200 to λ8000 Å. Two observational features readily noted in these stars are: (i) a Balmer discontinuity smaller than that ...
  • Understanding balloon-borne frost point hygrometer measurements after contamination by mixed-phase clouds 
    Jorge, Teresa et al.; Naja, M. (Atmospheric Measurement Techniques, 2021-01-14)
    Balloon-borne water vapour measurements in the upper troposphere and lower stratosphere (UTLS) by means of frost point hygrometers provide important information on air chemistry and climate. However, the risk of ...

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