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<H2><A NAME="SECTION0004160000000000000000">SLA_RVLSRD - RV Corrn to Dynamical LSR</A>
<A NAME="xref_SLA_RVLSRD"> </A><A NAME="SLA_RVLSRD"> </A>
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<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Velocity component in a given direction due to the Sun's
motion with respect to the ``dynamical'' Local Standard of Rest.
<P> <DT><STRONG>CALL:</STRONG>
<DD><TT>R = sla_RVLSRD (R2000, D2000)</TT>
<P> </DL>
<P> <DL>
<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>R2000,D2000</EM></TD>
<TH ALIGN="LEFT"><B>R</B></TH>
<TD ALIGN="LEFT" NOWRAP>J2000.0 mean <IMG WIDTH="42" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img3.gif"
ALT="$[\,\alpha,\delta\,]$"> (radians)</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>RETURNED:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>sla_RVLSRD</EM></TD>
<TH ALIGN="LEFT"><B>R</B></TH>
<TH ALIGN="LEFT" NOWRAP>Component of <I>peculiar</I> solar motion
in direction R2000,D2000 (km s<SUP>-1</SUP>)</TH>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>NOTES:</STRONG>
<DD><DL COMPACT>
<DT>1.
<DD>Sign convention: the result is positive when
the Sun is receding from the given point on the sky.
<DT>2.
<DD>The Local Standard of Rest used here is the <I>dynamical</I> LSR,
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 <I>peculiar</I> solar
motion.
<DT>3.
<DD>There is another type of LSR, called a <I>kinematical</I> LSR. A
kinematical LSR is the mean standard of rest of specified star
catalogues or stellar populations, and several slightly
different kinematical LSRs are in use. The Sun's motion with
respect to an agreed kinematical LSR is known as the
<I>standard</I> solar motion.
The dynamical LSR is seldom used by observational astronomers,
who conventionally use a kinematical LSR such as the one implemented
in the routine sla_RVLSRK.
<DT>4.
<DD>The peculiar solar motion is from Delhaye (1965), in <I>Stars
and Stellar Systems</I>, vol 5, p73: in Galactic Cartesian
coordinates (+9,+12,+7) km s<SUP>-1</SUP>.
This corresponds to about 16.6 km s<SUP>-1</SUP>
towards Galactic coordinates <IMG WIDTH="148" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img224.gif"
ALT="$l^{I\!I}=53^{\circ},b^{I\!I}=+25^{\circ}$">. </DL></DL>
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<ADDRESS>
<I>SLALIB --- Positional Astronomy Library<BR>Starlink User Note 67<BR>P. T. Wallace<BR>12 October 1999<BR>E-mail:ptw@star.rl.ac.uk</I>
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