Monitoring of active galactic nuclei. VI. The quasar Mrk 876

For pt. V see ibid., vol. 285, no. 3, p. 857-67 (1994). We present the results of a 6 month monitoring campaign of Mrk 876, a low luminosity quasar with M absap-24. High resolution spectroscopy and direct imaging in the Johnson filters B, V, R, I was carried out in the first half of 1990. Line and continuum light curves are presented. Mrk 876 showed a decrease of 17% in the continuum over the whole observing period whereas the line flux of Hbeta and Halpha stayed constant. This implies, that the radius of the broad line region is larger than 6 light months. Coadded spectra of Hbeta and Halpha are presented which confirm an extreme asymmetry of the line profiles to the red. With respect to much earlier spectra the line profiles changed considerably

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
Experimental/ astronomical photometry
galactic nuclei
quasars
visible spectra/ active galactic nuclei
visible spectra
Johnson photometry
BVRI photometry
high resolution spectra
line light curves
line intensity
broad line region
quasar morphology
line profiles/ A9870J Quasars A9580J Photographic region astronomical observations A9575D Astronomical photographic and electronic imaging
and photometry/ Mrk 876
QSO 1613+658

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