Ln. Berdnikov et al., PERIOD-LUMINOSITY RELATION FOR CLASSICAL CEPHEIDS - ESTIMATING THE INTRINSIC SCATTER, Astrophysics and space science, 252(1-2), 1997, pp. 473-477
Published photoelectric and CCD photometric data for fundamental-mode
Cepheids in the Large Magellanic Cloud are analyzed. The inferred scat
ter of the observed period-luminosity relation decreases with increasi
ng quality of the light curves used. The observed scatter of the perio
d-luminosity relations in the V and I-C bands is as low as 0(m).11 and
0(m).07, respectively, i.e., a factor of similar to 1.5 smaller than
the lowest published estimates. This, in particular, suggests that the
intrinsic scatter might be lower than previously believed.