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

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

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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