Aryabhatta Research Institute of Observational Sciences: Recent submissions

  • Three- colour photometry of GH pegasi 
    Srivastva, R. K.; Padalia, T. D. (1974)
    The geometrical element of the system GH pegasi and a slightly improved period of 2ᵈ.556136 have been given.
  • SH on the sun 
    Sinha, K.; Joshi, G. C.; Pande, M. C. (1976)
    The theoretical estimates of the abundances and intensities of the fraunhofer lines for various atomic and molecular species facilitate identification and clarify the role of blending produced by the nearby lines in the ...
  • Mulliken bands in the solar spectrum 
    Sinha, K.; Joshi, G. C. (1976)
    The lower X¹Σg state of the Phillips and of the Mulliken band system of C₂ molecule lies very close to the X¹ ³πᵤ' the lower electronic state of the Swan system observed in the photospheric spectrum.
  • Vibration rotation bands of NO in sunspots 
    Gaur, V. P. (1976)
    The equivalent widths of R1(26.5)lines,belonging to the 1-0,2-1 and 3-2 vibration bands of NO near 5.3 µm,have been computed for two different sunspot models at four positions on the disc.The computed equivalent widths in ...
  • Vibration rotation bands of SiO in sunspots 
    Gaur, V. P.; Pande, M. C.; Tripathi, B. M. (1978)
    The equivalent widths of P(51) and R(43) lines of the 1-0 and P(45) and R(56) lines of the 2-1 vibration rotation bands of SiO near 8 µm region, have computed for Zwaan's(1974) sunspots model at the centre of the disc. The ...
  • On the gamma system of nitric oxide in sunspots 
    Joshi, G. C.; Pande, M. C.; Shukla, D. S. (1978)
    With the aim of investigating the resonance system of NO,equivalent width calculation have been made for the 213.575nm,Q1(31.5)line of the 1-0 band of y-system of NO for the photospheric HSRA model,and for the line ...
  • The gap in the H-R diagram of open clusters with special reference to NGC 2169, NGC 1778 and Tr ׀ 
    Sagar, Ram; Joshi, U. C. (1978)
    The colour-magnitude diagrams of the open clusters NGG 1778 and Tr 1 indicate the presence of gaps of the rising branches of the evolving main sequence. the positions of these gaps are compared with those found in other ...
  • (A-X) system of SiO in sunspots 
    Joshi, G. C.; Punetha, L. M.; Pande, M. C. (1979)
    The calculated equivalents widths of some lines of SiO in the umbral spectrum suggest that strong lines of Si²⁸ O¹⁶ , Si²⁹ O¹⁶ , and Si³⁰ O¹⁶, may be present in the sunspot ultraviolet spectrum. We also find that between ...
  • Periodogram analysis of the light curves of 44 Tau 
    Gupta, S. K. (1979)
    The periodogram analysis of the light curves of the curves of the scuti star 44 tau(=HR 1287) has been carried out. The fundamental period of 44 Tau ,based on the epochs of maxima, is found to be 0.d144969 and the beat ...
  • Centre to limb behaviour of molecular rotational temperatures 
    Sinha, K. (1979)
    Withbroe'(1968) photospheric data on the equivalent widths of C2 lines for various positions on the solar disc have been utilized by us to determine the centre to limb behaviour of the rotational temperature.in view of ...
  • Rapid optical varability of TeV blazars 
    Gopal-Krishna; Goyal, Arti; Joshi, S.; Karthick, Chrisphin; Sagar, R.; Witta, P.J.; Anupama, G.C.; Sahu, D.K. (MNRAS, 2011-05-18)
    In this first systematic attempt to characterize the intranight optical variability (INOV) of TeVdetected blazars, we have monitored a well-defined set of nine TeV blazars on total 26 nights during 2004–10. In this R- ...
  • On the variability of the suspected beta cephei stars V351, V356, V357 Per 
    Mahra, H. S.; Mohan, V. (1979)
    Hill (1967) has listed a number of suspected Beta Cephei stars. Out of these the stars V351 Per (HD 13051), V356 Per (BD 56°473) and V357 Per (HD 13866) were put on our observing programme, in order to determine their variability.
  • Photoelectric observations of the novalike objects in vulpecula 
    Mahra, H. S.; Joshi, S. C.; Srivastava, J. B.; Dhir, S. L. (1979)
    Photoelectric observations of the novalike objects in vulpecula were obtained on several nights during the period April to June 1979, on the 104-cm reflector of the Uttar Pradesh State Observatory, using UBV filters of ...
  • Light variation of the delta Scuti star 38 CNC 
    Gupta, S. K. (1979)
    The light curves of the δ Scuti variable 38 Cnc, which is member of the Praesepe cluster, have been analysed using the techniques of perodogram analysis and least square solutions. The star pulsates in the second overtone ...
  • SN 2008in − bridging the gap between normal and faint supernovae of type IIP 
    Roy, R.,... et al. (IOP Publishing Limited, 2011-08)
    We present optical photometric and low-resolution spectroscopic observations of the Type II plateau supernova (SN) 2008in, which occurred in the outskirts of the nearly face-on spiral galaxy M 61. Photometric data in the ...
  • Molecular line haze opacity in sunspots 
    Gaur, V. P.; Pande, M. C.; Sah, M. (1979)
    It has been shaown that bound-bound opacity due to electronic transitions of molecules CN, CaH, MgH and TiO explains, in first approximation, the line haze opacity postulated by Zwaan (1974) for the region 0.5 µm to 0.9 ...
  • Classification of M-type stars from spectral scans 
    Rautela, B. S.; Joshi, S. C. (1979)
    Continuous spectral scans of 64 M-type stars in the wavelength region 400-750 nm have been obtained with a bandwidth of 5 nm. The scans have been placed on an absolute energy scale. In this paper we discuss three classification ...
  • Solar photospheric models and the rotational temperatures of the C₂ and MgH molecules 
    Singh, K.; Shukla, D. S.; Tripathi, B. M. (1979)
    Four photospheric models have been utilized to derive model based rotational temperatures of the (0-0) band of the Swan system of C₂ and that of the green system of the MgH molecules. The dissociation energies were varied ...
  • CH and CH⁺ lines in facula models 
    Tripathi, B. M. (1978)
    Equivalent width calculations for CH and CH⁺ are carried out in three facula models. For CH, the λ4313.662 A line of the (0-0) and of the transition ²∆ - ²II of the Q₁c branch, and for CH⁺ , the λ 4288.047 A line of the ...
  • Study of the galactic cluster NGC 581 
    Sagar, R.; Joshi, U. C. (1978)
    Photoelectric magnitudes and colours in the UBV system have been determined for 73 stars in NGC 581. The value of the interstellar reddening is 0 ͫ . 38. The distance modulus to the cluster is estimated at 12 ͫ .16±0 ͫ .1 ...

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