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DEREDD

DEREDD

Name


    DEREDD

Purpose


    Deredden stellar Stromgren parameters given for a value of E(b-y)

Explanation


    See the procedure UVBYBETA for more info.

Calling Sequence


    deredd, eby, by, m1, c1, ub, by0, m0, c0, ub0, /UPDATE

Inputs


    Eby - color index E(b-y),scalar (E(b-y) = 0.73*E(B-V) )
    by - b-y color (observed)
    m1 - Stromgren line blanketing parameter (observed)
    c1 - Stromgren Balmer discontinuity parameter (observed)
    ub - u-b color (observed)
    These input values are unaltered unless the /UPDATE keyword is set

Outputs


    by0 - b-y color (dereddened)
    m0 - Line blanketing index (dereddened)
    c0 - Balmer discontinuity parameter (dereddened)
    ub0 - u-b color (dereddened)

Optional Input Keywords


    /UPDATE - If set, then input parameters are updated with the dereddened
          values (and output parameters are not used).

Revision History


    Adapted from FORTRAN routine DEREDD by T.T. Moon
    W. Landsman STX Co. April, 1988
    Converted to IDL V5.0 W. Landsman September 1997



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