Abstract
After computing theH-functions for 21 different phase functions corresponding to various combinations of\(\bar \varpi \) 1=ϖ1/ϖand\(\bar \varpi \) 2=ϖ2/ϖalong with 15 values of ϖ, variations of equivalent widths with phase angle have been obtained for these cases for lines with Lorentz profile with the continuum albedo ϖ c =0.99. It is found that: (i) The absolute values of equivalent width at any phase angle are Inversely related to the value of phase function for that angle; (ii) The usual inverse phase effect occurs whenever the phase function has a maximum at α=0 and a dip somewhere between α=0 and α=180; (iii) Whenever the phase function has minima at α=0 and α=180 one obtains an incipient inverse phase effect at large phase angles; and (iv) The total variations are larger for weaker lines.
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Bhatia, R.K., Abhyankar, K.D. Multiple scattering and the phase variation of equivalent widths for phase functions of typeP(cosθ)=ϖ+ϖ1 P 1(cosθ)+ϖ2 P 2(cosθ). Astrophys Space Sci 96, 107–123 (1983). https://doi.org/10.1007/BF00661945
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DOI: https://doi.org/10.1007/BF00661945