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Browsing IIAP Publications by Title

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  • Possible effects of positronium negative ion on 0.511 MeV gamma-ray line in astrophysical sources 
    Sivaram, C; Krishan, V (Springer, 1982-07)
    The astrophysical importance of the negative positronium ion, detected recently in the laboratory, has been pointed out. It is found that the presence of Ps(-) ions will contribute additionally to the width of the 0.511 ...
  • Possible Evidence of Long-Term Oscillations in the Solar Atmosphere 
    Raju, K. P; Singh, J; Srikanth, R; Chou, Dean-Yi; CA, TON team (Springer, 2001-03)
    We have obtained the temporal correlation function, Q(t), from time sequences of Caii K filtergrams and Dopplergrams from Antarctica, Taiwan Oscillation Network (TON) and Solar and Heliospheric Observatory (SOHO). Q(t) ...
  • A possible high altitude high energy gamma ray observatory in India 
    Cowsik, R; Bhat, P. N; Chitnis, V. R; Acharya, B. S; Vishwanath, P. R (Copernicus Gesellschaft, 2001-08)
    Recently an Indian Astronomical Observatory has been set up at Hanle (32° 46 4 6 N , 78° 57 5 1 E , 4515m amsl) situated in the high altitude cold desert in the Himalayas. The Observatory has 2-m aperture optical-infrared ...
  • Possible Mechanisms of Formation of Clusters with cD Galaxies and Gravitational Lenses 
    Anosova, J; Namboodiri, P. M. S; Deshpande, M. R (Astronomical Society of the Pacific, 1996)
  • A possible P-L relation for RR-Lyrae variables in globular clusters 
    Scaria, K. K (Kluwer Academic Publishers, 1984-08)
    A study of the mean photographic magnitudes of RR Lyrae variables in galactic globular clusters has shown that the luminosity of RR-ab variables decreases with period. It is found that RR-ab variables, in the cluster ω ...
  • Possible proto-planetary nebulae 
    Parthasarathy, M (Cambridge University Press, 1989)
    IRAS data for high-galactic-latitude F supergiants, a few luminous F-G stars, and a few peculiar (forbidden) emission-line stars reveal they have dust shells with characteristics similar to those observed in planetary ...
  • Possible signatures for strange stars in stellar X-ray binaries 
    Datta, B; Thampan, A. V; Bombaci, I (European Southern Observatory, 2000-03)
    Kilohertz quasi-periodic brightness oscillations (kHz QPOs) observed in certain X-ray burst sources may represent Keplerian frequencies in the inner regions of the accretion disk in such systems. If this assumption is ...
  • Possible young stellar objects in the region of the Cygnus OB2 (VI Cygni) association from IRAS observations 
    Parthasarathy, M; Jain, S. K; Bhatt, H. C (EDP Sciences, 1992-12)
    Several massive young stellar objects are found from an analysis of the 12- to 100-micron flux data of IRAS sources in the region of the Cyg OB2 association. Sixty-four sources with positive spectral indices and steeply ...
  • Post-Agb Candidates 
    Parthasarathy, M (Astronomical Society of the Pacific, 1993-01)
  • The Post-Coronal Mass Ejection Solar Atmosphere and Radio Noise Storm Activity 
    Kathiravan, C; Ramesh, R; Nataraj, H. S (University of Chicago Press., 2007-02)
    We carried out a statistical study of solar radio noise storms whose onset was in the aftermath of coronal mass ejections (CMEs) that occurred during 1997–2004, the first half of present solar cycle 23. The work is an ...
  • Post-flare pulsations in the 54–78 MHz frequency band 
    Subramanian, K. R; Ebenezer, E (Springer, 2003-12)
    Quasi-periodic pulsations with periods mostly around 13 s in the frequency range of 54-78 MHz have been observed following the first X2 flare occurring on 24 November 2000. Assuming an impulsively generated propagating MHD ...
  • Post-Maximum Optical and Infrared Observations of Nova V1425 Aquilae 1995 
    Kamath, U. S; Anupama, G. C; Ashok, N. M; Chandrasekhar, T (American Astronomical Society, 1997-12)
    We present the post-maximum optical spectroscopy and infrared photometry of Nova V1425 Aquilae 1995. The data indicate that the nova belongs to the Fe ii class and that it formed an optically thin dust shell at a very early ...
  • Post-midnight occurrence of equatorial spread-f 
    Sastri, J. H (National Institute of Science Communication and Information Resources, 1981-06)
    Evidence is presented to point out that the presence of an elevated F-region with reduced peak electron density in the equatorial region does not always result in the occurrence of spread-F condition in the post-midnight period.
  • Post-midnight onset of spread-F at Kodaikanal during the June solstice of solar minimum 
    Sastri, J. H (European Geosciences Union, 1999-08)
    At dip equatorial stations in the Indian zone, spread-F conditions are known to develop preferentially around midnight during the June solstice (northern summer) months of low solar activity, in association with a distinct ...
  • Post-outburst Evolution of Bona Fide FU Ori-type V2493 Cygnus: A Spectro-photometric Monitoring 
    Ghosh, Arpan; Sharma, Saurabh; Ninan, Joe P; Ojha, Devendra K; Bhatt, B. C; Sahu, D. K; Baug, Tapas; Yadav, R. K; Irawati, Puji; Gour, A. S; Panwar, Neelam; Pandey, Rakesh; Sinha, Tirthendu; Verma, Aayushi (American Astronomical Society, 2023-09-01)
    We present here the results of 8 yr of our near-simultaneous optical–near-infrared spectro-photometric monitoring of the bona fide FU Ori (FUor)-type candidate V2493 Cygnus (V2493 Cyg) starting from 2013 September to 2021 ...
  • Post-outburst phase of LDN 1415 nebula (IRAS 04376+5413) 
    Pawad, V. S; Ojha, D. K; Ninan, J. P; Tej, A; Bhatt, B. C; Sahu, D. K; Ghosh, S. K; Kaurav, S. S; Mohan, V (Astronomical Society of India, 2010)
    LDN 1415 nebula was first detected by Stecklum (2006) in early April 2006 in the vicinity of lRAS 04376+5413. In this paper, we present a study of the post-outburst phase of LDN 1415 nebula using optical (V, R, J) and ...
  • Post-outburst phase of McNeil's nebula (V1647 Orionis) 
    Ojha, D. K; Ghosh, S. K; Tej, A; Verma, R. P; Vig, S; Anupama, G. C; Sahu, D. K; Parihar, P. S; Bhatt, B. C; Prabhu, T. P; Maheswar, G; Bhatt, H. C; Anandarao, B. G; Venkataraman, V (Blackwell Publishing, 2006-03)
    We present a detailed study of the post-outburst phase of McNeil's nebula (V1647 Orionis) using optical B, V, R, I and near-infrared (NIR) J, H, K photometric and low-resolution optical spectroscopic observations. The ...
  • Post-Sunset behaviour of the equatorial anomaly in the Indian sector 
    Sastri, J. H (The Council of Scientific and Industrial Research, 1982-02)
    A detailed Investigation is made of the relationship, In the post-sunset period, between the depth of the equatorial anomaly and the evening rise of F-region at the trough on a day-to-day basis, using pubhshed data ...
  • Postulating exoplanetary habitability via a novel anomaly detection method 
    Sarkar, Jyotirmoy; Bhatia, Kartik; Saha, Snehanshu; Safonova, M; Sarkar, Santonu (Oxford University Press on behalf of Royal Astronomical Society, 2022-03)
    A profound shift in the study of cosmology came with the discovery of thousands of exoplanets and the possibility of the existence of billions of them in our Galaxy. The biggest goal in these searches is whether there are ...
  • Potential energy curve for isomerization of N2H2 and C2H4 using the improved virtual orbital multireference Møller–Plesset perturbation theory 
    Chaudhuri, R. K; Freed, K. F; Chattopadhyay, S; Sinha Mahapatra, U (American Institute of Physics, 2008-04)
    Multireference Møller–Plesset (MRMP) perturbation theory [K. Hirao, Chem. Phys. Lett. 190, 374 (1992)] is modified to use improved virtual orbitals (IVOs) and is applied to study ground state potential energy curves for ...

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