The 1987 outburst of the BL Lacertid AO 0235 + 164

Details The 1987 outburst of the BL Lacertid AO 0235 + 164 The 1987 outburst of the BL Lacertid AO 0235 + 164

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...220...65w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 220, no. 1-2, Aug. 1989, p. 65-70.

Astronomy and Astrophysics

Astrophysics

18

Active Galactic Nuclei, Astronomical Spectroscopy, Bl Lacertae Objects, Accretion Disks, Fourier Analysis, Light Curve, Power Spectra

Scientific paper

The violently variable BL Lacertid AO 0235 + 164 displayed a 3.24 magnitude outburst in early 1987. This outburst was observed intensively from Rosemary Hill Observatory in three colors. Long term monitoring observations made at Rosemary Hill are examined in an effort to find any recurring timescales associated with this outburst and previous large amplitude outbursts. The energetics of the 1987 outburst are analyzed in terms of the Shields and Wheeler model of a magnetized accretion disk. The timescales identified in the power spectrum (2.8 and 1.6 yr) are input into the model as the storage timescales. Since the emitted energy calculated from the optical burst cannot be stored in a magnetized disk at an allowable radius, it is concluded that either the storage timescales are longer than those identified in the power spectrum, or relativistic beaming effects must be considered, with a Doppler factor of 1.3 to 1.6.

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