Publicaciones

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  • A possible nineteen-minute periodicity in the light curve of OJ 287
    A periodic signal of high nominal significance (99.95 percent) is found in the light curve of OJ 287 in observations taken with the Prime Focus Camera Unit on the 2.5 m Isaac Newton Telescope on two nights in March-April 1987. No such periodicity is seen in the light curve of the simultaneously observed reference star. A null test involving
    de Diego, Jose Antonio et al.

    Fecha de publicación:

    9
    1990
    Número de citas
    10
  • A possible nineteen-minute periodicity in the light curve of OJ 287
    A periodic signal of high nominal significance (99.95%) is found in the light curve of OJ 287 in observations taken with the Prime Focus Camera Unit on the 2.5 m Isaac Newton Telescope on two nights in March April 1987. No such periodicity is seen in the light curve of the simultaneously observed reference star. A null test involving observations
    Antonio de Diego, José et al.

    Fecha de publicación:

    9
    1990
    Número de citas
    0
  • A carbon star outflow envelope about IC 418
    The results of near-infrared mapping, optical spectroscopy, and millimetric CO J = 2-1 observations of the halo about IC 418 are presented. As a result, it is confirmed that NIR emission extends outside of the principal emission shell, and into a zone characterized by weak optical grain scattering and (in all probability) strong FIR emission. An
    Phillips, J. P. et al.

    Fecha de publicación:

    9
    1990
    Número de citas
    4
  • Velocity fields associated with the magnetic component of solar faculae
    Theoretical models are developed to account for the asymmetries observed by Stenflo et al. (1984) in the Stokes V profiles of solar faculae. The approximate dependence of Stokes V on magnetic and velocity fields in the line of sight is characterized under the assumption of local thermodynamic equilibrium, and empirical growth curves for the zero
    Sanchez Almeida, J. et al.

    Fecha de publicación:

    8
    1990
    Número de citas
    5
  • Variability of the Ap-Star 21-COMAE-BERENICES - Results from Multiple-Site Campaigns
    A total of over 210 hr of previously unpublished differential photoelectric photometry of 21 Com (HD 108945, HR4766), obtained in five years, were analysed to search for periodicities. Of these, the 88 hr obtained in 1983, 1985, 1986 and 1989 were searched for, and show no indications of short-period variability. In 1988, over 116 hr of
    Kreidl, T. J. et al.

    Fecha de publicación:

    8
    1990
    Número de citas
    23