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The extinction curve in the visible and the value of RV: Addendum to AN 333, 160

“…Turner 1976). Exponents p larger than 1.8 which have been suggested by Mathis (1990), Berdnikov et al (1996), or Stead & Hoare (2009), cannot be reconciled with the assumption of a universal extinction law from the visible to the infrared. Either the near-infrared extinction law differs from that for the visible, in which case the extrapolation of the extinction curve to 1/λ = 0 does not give R V (Paper 1), or the same power law is valid for both the visible and infrared normalized extinction curves, and an updated version of the infrared extinction law is needed in order to fix the exact values of p and R V .…”

“…Infrared normalized extinction curves published by Rieke & Lebofsky (1985), Berdnikov et al (1996), and Bondar et al (2006) are plotted in Fig. 3.…”

Galactic Cepheids. Catalogue of light-curve parameters and distances

“…Since the publication of this catalogue we have collected extensive photoelectric data which, combined with published photometry, allows us to increase the number of stars with reliable light curves by ∼ 25 per cent. This, and also the fact that we recently refined some of the fundamental underlying assumptions and procedures used to calculate the Cepheid distances, namely interstellar extinction law (Berdnikov et al 1996a) and PL relation (Berdnikov et al 1996b), made it necessary to prepare a new version of our catalogue, which we present in this paper.…”

“…We also dropped the U magnitude from our catalogue because it is now not used in the Cepheid photometry. We have published a catalogue of infrared (JHK) light-curve parameters elsewhere (Berdnikov et al 1996a). …”

“…We inferred the distances to Cepheids using the light-curve parameters derived as described above and the following procedure suggested by Berdnikov et al (1996b):…”