\documentstyle[twoside,epsf]{article}

\input ibvs2.sty
\input ibvst.sty

\begin{document}

\IBVShead{4903}{2 June 2000}

\IBVStitle{The New Bright RR L\lowercase{yr} NSV 01470}

\IBVSauth{Vidal-Sainz, Joaquin$^1$; Garc\'{i}a-Melendo, Enrique$^2$}

\IBVSinst{Grup d'Estudis Astronomics, Apdo.\ 9481, 08080 Barcelona,
Spain, e-mail: jmgomez@astrogea.org}

\IBVSinst{Esteve Duran Observatory Foundation, Montseny 46 -- Urb.\ El
Montanya, 08553 Seva, Barcelona, Spain,\\ \indent e-mail: duranobs@astrogea.org}

\SIMBADobj{GSC 4068-447}

\begintext

\IBVSTnam{GSC 4068\_447 = NSV 01470 = CSV 006077 = BV 0311}

\IBVSTcoo{04\hr 09\mm 40\sec}{+62\deg 27\arcm 12\arcs}{2000.0}

\IBVSTobs{Monegrillo Observatory, 0.4-m Newtonian telescope;\\ Esteve
Duran Observatory, 0.6-m Cassegrain telescope}

\IBVSTdet{CCD}

\IBVSTfil{$V$ and $B$}

\IBVSTcomp{GSC 4068\_1369}

\IBVSTchk{GSC 4068\_472; GSC 4068\_1431}

\IBVSTsysn

\IBVSTdata{Upon request}

\IBVSTtyp{ RRab }

\IBVSfig{8cm}{4903-f1.ps}{}

\IBVSTrem{
Its variability was initially reported by Strohmeier and Knigge (1960),
who indicated that this star presented rapid light changes between the
photographic magnitudes of 11.8 and 12.5. This object was afterwards
listed as an `S' type variable in the NSV catalogue (Kholopov 1982).
Observations performed in the $B$ and $V$ bands between December 1999 and
March 2000 indicate that this object is an RRab Lyrae star. Although no
photometric standarization was performed, previous collaborative work
with the USNO Flagstaff station (Henden et al.\ 1999, Henden and Vidal
1997) showed that differential photometry performed at Monegrillo and
Esteve Duran Observatories are virtually on the Johnson standard
system, therefore we can estimate the standard amplitude in $V$
and of the color index $B-V$ after using the derived Johnson $V$ and
$B-V$ magnitudes from the TYCHO photometric data for the comparison
star. These results indicate that $V$ light changes of NSV 01470 are
within 11\fmm10 and 11\fmm75, and that the $B-V$ color index ranges
between 0\fmm75 and 0\fmm95. The following ephemeris was computed in
the $V$ band:\belowdisplayskip-12pt
$$\begin{array}{r@{}r@{}l}
{\rm Max. = HJD}~2451578.480 & {} + 0\fday572092 & {} \times E. \\
{} \pm 0.010 & {} \pm 0.000100 \\
\end{array}$$
}

\references

ESA, 1997, The Hipparcos and Tycho Catalogues, ESA SP-1200

Henden A. A., Guarro-Flo, J., Garc\'{\i}a-Melendo, E., 1999, {\it IBVS}, No.\ 4807

Henden, A.A., Vidal-Sainz, J., 1997, {\it IBVS}, No.\ 4535

Kholopov, P.N., editor, 1982, New Catalogue of Suspected Variable Stars, Moscow   

Strohmeier W., Knigge R., 1960, {\it Bamb.\ Ver.}, {\bf 5}, No.\ 5

\end{document}
