Open Access
Table 2
Free parameters of our geometric models.
| fc | Flux contribution of circumstellar environment |
| fh | Flux contribution of halo (if any) |
| cos i | Cosine of inclination |
| PA | Position Angle of major axis from Nortd to East |
| kc | Spectral index of circumstellar environment |
| Ellipsoid | |
| Lor | Weighting for radial brightness distribution (a) |
| log a | Log of half-flux semi-major axis (with a in mas) |
| Ring | |
| Lor | Weighting for radial brightness distribution of convolution kernel (a) |
| log a | Log of half-flux semi-major axis (with a in mas) |
| log (ak∕ar) | Log of ratio between angular radius of kernel and of ring |
| c1, s1 | Cosine and sine angular modulation of 1st order |
Notes. (a) Lor ranges between 0 and 1; Lor = 0 for a Gaussian radial distribution and Lor = 1 for a Lorentzian one. See Appendix D.
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