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.help rvlsrk Jun99 "Slalib Package"
.nf
REAL FUNCTION slRVLK (R2000, D2000)
- - - - - - -
R V L K
- - - - - - -
Velocity component in a given direction due to the Sun's motion
with respect to an adopted kinematic Local Standard of Rest.
(single precision)
Given:
R2000,D2000 r J2000.0 mean RA,Dec (radians)
Result:
Component of "standard" solar motion in direction R2000,D2000 (km/s)
Sign convention:
The result is +ve when the Sun is receding from the given point on
the sky.
Note: The Local Standard of Rest used here is one of several
"kinematical" LSRs in common use. A kinematical LSR is the
mean standard of rest of specified star catalogues or stellar
populations. The Sun's motion with respect to a kinematical
LSR is known as the "standard" solar motion.
There is another sort of LSR, the "dynamical" LSR, which is a
point in the vicinity of the Sun which is in a circular orbit
around the Galactic centre. The Sun's motion with respect to
the dynamical LSR is called the "peculiar" solar motion. To
obtain a radial velocity correction with respect to the
dynamical LSR use the routine slRVLD.
Reference: Delhaye (1965), in "Stars and Stellar Systems", vol 5,
p73.
Called:
slCS2C, slVDV
P.T.Wallace Starlink 11 March 1994
Copyright (C) 1995 Rutherford Appleton Laboratory
Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
.fi
.endhelp
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