The authors present results of a four night's optical monitoring of the Seyfert nucleus NGC 7469 in search for microvariability. At visible wavelengths the authors used the same instrumentation, data and error analysis as in a previous monitoring (Dultzin-Hacyan et al., 1992) and found a negative result: no microvariability. During two nights, simultaneous monitoring was done at 1.65 μm (H band) and significant (7.8σ) variations with ΔH ≡ 0.39 mag were observed in Δt = 1.65 hrs during the first night and marginal evidence (2.5σ) of variability with ΔH = 0.12 mag in Δt = 1.04 hrs during the second night. This observational result should be taken with caution and it is important to confirm it with future observations, although this may not be easy, due to the transient character of microvariability. The authors briefly discuss some models.
Revista Mexicana de Astronomia y Astrofisica
- Pub Date:
- October 1993
- Seyfert Galaxies: Light Curves;
- Seyfert Galaxies: Variations