Multiple scattering and the phase variation of equivalent widths for phase functions of type P(cosθ)=ω+ω1P1(cosθ)+ω2P2(cosθ)

Bhatia, R. K. ; Abhyankar, K. D. (1983) Multiple scattering and the phase variation of equivalent widths for phase functions of type P(cosθ)=ω+ω1P1(cosθ)+ω2P2(cosθ) Astrophysics and Space Science, 96 (1). pp. 107-123. ISSN 0004-640X

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Official URL: http://www.springerlink.com/content/l1618610m17573...

Related URL: http://dx.doi.org/10.1007/BF00661945

Abstract

After computing the H-functions for 21 different phase functions corresponding to various combinations of w-l = wl/w and w-2 = w2/w along with 15 values of w, variations of equivalent widths with phase angle have been obtained for these cases for lines with Lorentz profile with the continuum albedo wc= 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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