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Browsing by Author "Mahra, H. S."

Browsing by Author "Mahra, H. S."

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  • Open clusters and galactic structure 
    Pandey, A. K.; Bhatt, B. C.; Mahra, H. S. (1988)
    The open clusters data compiled by Janes and Adler (1982) have been used to study the distribution of open clusters within 1500 pc of the Sun. It is found that the plane defined by the distribution of young open clusters ...
  • Photoelctric observations of NOVA Sagittarii 1977 
    Sagar, R.; Mahra, H. S.; Joshi, S. C.; Srivastava, J. B. (1977)
    Photoelectric observations of Nova Sagittarii 1977 (alpha1950 =18h35m17s; delta1950= -23d 25'21") were secured on the 104-cm and 56-cm reflectors of the Uttar Pradesh State Observatory on several nights during April and ...
  • 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 ...
  • Photometric flash-light observations of SL9 impact on Jupiter 
    Srivastava, R. K.; Padalia, T. D.; Mahra, H. S. (1997)
    The effects of SL9 impact on Jupiter has been assessed by observing flash-light effect on the nearest satellites of Jupiter, the Io, on 21 July, 1994. The observations in V filter of flash-light effect on Io suggest a ...
  • 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 ...
  • A photometric study of the open cluster King 7 
    Durgapal, A. K.; Mohan, V.; Pandey, A. K.; Mahra, H. S. (1996)
    The UBVRI CCD photometric observations of stars in the field o King 7 have been used to study the fundamental parameters such as interstellar extinction, age distance and mass function of the cluster. To obtain these ...
  • Population I-type objects and galactic structure 
    Pandey, A. K.; Bhatt, B.C.; Mahra, H. S. (1990)
    Data on open clusters, WR stars and supernova remnants (SNRs) have been used to study the large-scale structure of Milky Way. A comparison of the distributions of WR stars and SNRs indicates a weak correlation. It is also ...
  • Possible ring system of neptune 
    Pandey, A. K.; Mahra, H. S. (1987)
    A re-analysis of the observations of occultation of MKE 31 by Neptune on September 12, 1983(Pandey et al., 1984) shows that the possible ring system of Neptune extends from 64400 km to 64190 km in Neptune's plane.
  • 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 ...
  • Stellar contents of the open clusters Be 64 and Be 69 
    Pandey, A. K.; Durgapal, A. K.; Bhatt, B. C.; Mohan, V.; Mahra, H. S. (1997)
    We present U BV RI CCD photometry for previously unstudied open clusters (Be 64 and Be 69). Photometry has also been carried out for nearby fields to correct for the effects of field stars contamination. From the ...
  • A study of young open clusters 
    Pandey, A. K.; Bhatt, B. C.; Mahra, H. S. (1991)
    Star clusters constitute a principal link between stellar evolution theory and the observable universe. The important constraints which can be imposed on the theory of star formation by studies of galactic open clusters.
  • The young open star clusters: stability and structure 
    Pandey, A. K.; Mahra, H. S.; Sagar, R. (1990)
    It is found that the differential extinction ∆E(B - V) in open clusters, which may be due to the presence of gas and dust, decreases systematically with the age of the cluster. Consequently we can infer that the average ...

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