142 research outputs found
BVR photometry of a newly identified RS CVn binary star HD 61396
BVR photometry of a recently identified RS CVn binary star HD61396, carried
out during 2001, is presented. The new photometry reveal significant evolution
in the shape and amplitude of light curve when compared with those reported
earlier by Padmakar etal (2000). The traditional two-starspot model has been
used to obtain the spot parameters from the observed light curve. Changes in
the spot area and their location on the stellar surface are discernible from
the extracted parameters from the new photometry.Comment: 9 pages including 2 figures and 2 tables. New Astronomy in pres
A SuperMassive Black Hole Fundamental Plane for Ellipticals
We obtain the coefficients of a new fundamental plane for supermassive black
holes at the centers of elliptical galaxies, involving measured central black
hole mass and photometric parameters which define the light distribution. The
galaxies are tightly distributed around this mass fundamental plane, with
improvement in the rms residual over those obtained from the \mbh-\sigma and
\mbh-L relations. This implies a strong multidimensional link between the
central massive black hole formation and global photometric properties of
elliptical galaxies and provides an improved estimate of black hole mass from
galaxy data.Comment: Accepted for publication in ApJ Letter
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