palRvlsrk
palRvlsrk
- Velocity component in a given direction due to the Sun's motion
with respect to an adopted kinematic Local Standard of Rest
- Description:
- This function returns the velocity component in a given direction
due to the Sun's motion with respect to an adopted kinematic
Local Standard of Rest. The result is
ve when the Sun is receding
from the given point on the sky.
- Invocation:
- double palRvlsrk( double r2000, double d2000 )
- Arguments:
-
-
r2000 = double (Given)
-
J2000.0 mean RA (radians)
-
d2000 = double (Given)
-
J2000.0 mean Dec (radians)
- Returned Value:
-
-
Component of "standard" solar motion in direction R2000,D2000 (km/s).
-
- Notes:
- 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 sla_RVLSRD.
-
Reference
- Delhaye (1965), in "Stars and Stellar Systems", vol 5, p73.