This work presents a novel method to estimate the effective opening angle of CBe star disks from projected axis ratio measurements, obtained by interferometry using Bayesian statistics. A Monte Carlo scheme was used to generate a large set of theoretical axis ratios from disk models using different distributions of disk densities and opening angles. These theoretical samples were then compared to observational samples, using a two-sample Kolmogorov-Smirnov test, to determine which theoretical distribution best reproduces the observations. The results suggest that the observed ratio distributions in the K-, H-, and N-band can best be explained by the presence of thin disks, with opening half-angles of the order of 0.15∘ to 4.0∘. Results for measurements over the Hα line point toward slightly thicker disks, 3.7∘ to 14∘, which is consistent with a flaring disk predicted by the viscous disk model.
@article{arxiv.1411.7701,
title = {Statistical Analysis of Interferometric Measurements of Axis Ratios for Classical Be Stars},
author = {Richard P. Cyr and Carol E. Jones and Christopher Tycner},
journal= {arXiv preprint arXiv:1411.7701},
year = {2015}
}
Comments
Accepted for publication in ApJ, 10 pages, 13 figures