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Browsing by Author "Mahra, H. S."

Browsing by Author "Mahra, H. S."

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  • The age distribution and total lifetimes of open clusters 
    Pandey, A. K.; Mahra, H. S. (1986)
    The age distribution of galactic clusters is obtained from well-observed star clusters, and it is concluded that the observed age distribution of clusters within 1000 pc is not seriously affected by the selection effects. ...
  • Age distribution of open clusters as a function of their linear diameter and age-dependence of cluster masses 
    Pandey, A. K.; Bhatt, B. C.; Mahra, H. S. (1987)
    From the well-observed data of star clusters, the age distribution of galactic clusters is obtained as a function of their linear diameter and it is concluded that the observed age distribution of clusters for different ...
  • The age distribution of open clusters as a function of Trumpler's classifications 
    Bhatt, B. C.; Pandey, A. K.; Mahra, H. S. (1989)
    Typical lifetime of an open cluster is rather short compared to the age of the Galaxy, but there exists a wide spread in the individual lifetimes. The observed age distribution of the clusters. Trumpler (1930) has classified ...
  • Atmospheric precipitable water vapour over Manora Peak, Naini Tal 
    Bhatt, B. C.; Mahra, H. S. (1987)
    Precipitable water vapour is one of the variable atmospheric constituents and its short-term and seasonal variations may affect the infrared photometric observations. From the analysis of the measurements, made at Manora ...
  • 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 ...
  • Detection of new short period oscillations in PG 1711+336 (V795 HER) 
    Ashoka, B. N.; Seetha, S.; Marar, T. M. K.; Padmini, V. N.; Kasturirangan, K.; Rao, U. R.; Pande, M. C.; Mahra, H. S. (1989)
    Long period light variations of the cataclysmic variables PG 1711+336 (V795 Her) were first noticed by Mironov et al. (1983 a,b) who reported a photometric period of 0.115883 day for the system. Baidak et al., (1985) ...
  • Effect of mass segregation on mass function of young open clusters 
    Pandey, A. K.; Mahra, H. S.; Sagar, R. (1992)
    The effect of mass segregation on cluster mass function has been studied and it is found that the slope of the mass function is steeper in the outer part of the open clusters. Since derived dynamical relaxation time is ...
  • The effect of metallicity on the empirical relations for RR Lyrae stars I: effective temperature and colour 
    Mahra, H. S.; Sinvhal, S. D. (1980)
    It has empirically been shown that, for a given value of the effective temperature, the correction in (B-V) due to line blanketing varies linearly with the metallicity parameters ΔS. Next, on the basis of considerations ...
  • The effect of metallicity on the empirical relations for RR Lyrae stars II: the P-L-C relations 
    Mahra, H. S.; Sinvhal, S. D. (1980)
    The coefficients in the P-L-C relation for RR Lyr stars show dependence on the metallicity parameter ΔS. For the range of metallicity and effective temeperatures of RR Lyr stars, the effect of metallicity on the absolute ...
  • Extended ring system of Uranus 
    Bhattacharyya, J. C.; Bappu, M. K. V.; Mohin, S.; Mahra, H. S.; Gupta, S. K. (1979)
    Two photoelectric records of the occultation event on 10 March, 1977, obtained by two 102-cm-aperture telescopes, spaced 1500 km apart, are critically analysed and indications of a complex structure of distribution of ...
  • Integrated luminosity distribution of galactic open clusters 
    Bhatt, B.C.; Pandey, A. K.; Mahra, H. S. (1991)
    The integrated magnitudes of 221 galactic open clusters have been used to derive the luminosity function. The completeness of the data has been discussed. In the luminosity distribution the maximum frequency of clusters ...
  • Integrated parameters of open clusters 
    Pandey, A. K.; Bhatt, B. C.; Mahra, H. S.; Sagar, R. (1989)
    Integrated magnitudes and colours of population I synthetic clusters have been derived using the theoretical evolutionary tracks fiven by Stothers and Iben and an age-dependent intials mass function (IMF) obtained from the ...
  • Interstellar extinction and galactic structure 
    Pandey, A. K.; Mahra, H. S. (1987)
    Colour excesses and photometric distances of open clusters compiled by Janes & Adler and Lunga have been used to study the distribution of interstellar matter within a few kiloparsecs of the Sun. IN general the reddening ...
  • The occulation of Hyd -20º 51695 by Uranus on 1982 May 1 
    Pandey, A. K.; Mahra, H. S.; Mohan, V. (1984)
    The observe emersion event of the occulation of the star Hyd -20º51695 by Uranus on 1982 May 1 has been used to evaluate the temperature of the Uranian upper atmosphere. Assuming an isothermal atmosphere the scale height ...
  • The occultation of BD - 19º4222 by Uranus on 1981 April 26 
    Mahra, H. S.; Pandey, A. K.; Joshi, U. C.; Mohan, V. (1983)
    From the observations of the occultation of BD - 19º4222 by Uranus on 1981 April 26 the temperature profiles of the Uranium upper atmosphere have been obtained. The mean temperature of the upper atmosphere of Uranus in the ...
  • The occultation of MKE 31 by Neptune on September 12, 1983 
    Pandey, A. K.; Mahra, H. S.; Mohan, V. (1984)
    The predicted occultation of the star No. 31 (Mink et al., 1981) by Neptune on September 12, 1983 was observed photoelectrically. Four secondary occultations were recorded before the immersion event.
  • 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.

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