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Browsing by Author "Paliwal, D. C."

Browsing by Author "Paliwal, D. C."

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  • CCD photometry of galactic open star clusters – III. NGC 1931 
    Bhatt, B. C.; Pandey, A. K.; Mahra, H. S.; Paliwal, D. C. (1994)
    CCD photometry observations of young open cluster NGC 1931 in UBVRI passbands have been made down to 20.5 mag. The reddening across the cluster is found to be variable. The reddening varies from E(B – V)min = 0.55 mag to ...
  • CCD photometry of galactic open star clusters – IV. NGC 366 
    Pandey, A. K.; Bhatt, B. C.; Mohan, V.; Paliwal, D. C.; Mahra, H. S. (1994)
    CCD photometry of the open cluster NGC 366 has been carried out in UBVRI photometric passbands down to 19.5 mag. It is found that the reddening is non-uniforn across the cluster field., having ∆E(B – V) = 0.30 mag. A ...
  • CCD photometry of the galactic open star cluster-I. King 10 
    Mohan, V.; Pandey, A. K.; Paliwal, D. C.; Sagar, R.; Mahra, H. S. (1992)
    CCD photometry of the open cluster King 10 has been carried out in the UBVRI photometric passbands down to V~ 19.5 mag. The reddening for the cluster region is found to be variable. A distance of 3.2 kpc has been estimated ...
  • CCD photometry of the galactic open star cluster-II. NGC 7419 
    Bhatt, B. C.; Pandey, A. K.; Mohan, V.; Mahra, H. S.; Paliwal, D. C. (1992)
    CCD photometric observations of open cluster NGC 7419 in UBVRI passbands have been made down to V= 19.5 mag. Reddening across the cluster region is found to be variable. The mean visual absorption of 5.30 mag and a distance ...
  • Photometric performance of UPSO CCD system 
    Mohan, V.; Paliwal, D. C.; Mahra, H. S. (1991)
    The UBVRI photometric calibration of the CCD camera of the UP State Observatory, Naini Tal, is given here. This is based on the observations of photometric standards located near equatorial regions as well as in the open ...
  • Search for a 152-158 days periodicity in the occurrence rate of solar flares inferred from spectral data of radio bursts 
    Verma, V. K.; Joshi, G. C.; Uddin, W.; Paliwal, D. C. (1991)
    We have carried out a power spectrum analysis of the daily number of solar flares producing type I, II, III, IV, and V radio bursts for the period 1980-1984. The analysis shows that type II and IV radio bursts confirm the ...
  • Star formation efficiency in clouds of various masses 
    Pandey, A. K.; Paliwal, D. C.; Mahra, H. S. (1990)
    The present study is aimed at finding out the effect of variation of the initial mass function (IMF) on star - formation efficiency (SFE) in clouds of various masses. Using the model of Elmegreen and Clemans, it is found ...
  • Study of periodicities of solar nuclear gamma ray flares and sunspots 
    Verma, V. K.; Joshi, G. C.; Paliwal, D. C. (1992)
    Here we have carried out a power-spectrum analysis of solar nuclear gamma-ray (NGR) flares observed by SMM and HINOTORI satellites. The solar NGR flares show a periodicity of 152 days, confirming the existence of a 152-158 ...
  • 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 ...

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