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\IBVShead{4169}{9 March 1995}

\title{FAINT COMPANIONS TO UX ANTLIAE}

\begintext

Recently, UBV photometry was provided for stars in the fields of the R CrB type
stars UX Ant and UW Cen (Milone, 1994); later, identifications in several
catalogues (``Guide Star Catalogue'' (GSC), Henry Draper Catalogue, Cordoba 
Durchmusterung and Cape Photographic Durchmusterung) of the photometrically 
observed stars were also published in these Bulletins (Skiff, 1994). 
Precisely, it was said (Milone et al., 1990, Note 1; Milone, 1994, Note 2)
that the variable star UX Ant has ``a faint near-by companion'' but,
unfortunately, there is an erroneous identification of the close companion in
Note 2. In fact, the reason for the large discrepancy in the B magnitude of
the near-by star as indicated in Notes 1 and 2 is, that we are referring to
different stars (see Figure 1): it was star 1 for which we measured
B=16.5 (Note 1), whereas for star 2 it was found, V=14.55, B$-$V=0.41 (Note
2). This is the point we want to emphasize here, as (faint) stars of known
brightness neighboring a variable star can be useful in several respects.

It is worth mentioning that there are several examples of close companions
among the variable stars of the R CrB type. The following cases were noted 
(indicated distances in arc seconds from the variable are only approximate):
UX Ant, component 1: 

\noindent B=16.5, $\rho$=15'' to the NW, component 2: B=14.96,
$\rho$=45'' to the NE;

\noindent UW Cen, B=14.19, $\rho$=20'' to the NNW;

\noindent Y Mus, B=16.0, $\rho$=15'' to the W;

\noindent RZ Nor, B=13.7, $\rho$=8'' to the NE;

\noindent RY Sgr, B=16.48, $\rho$=12'', (Andrews et al., 1967; Feast, 1968).
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Very probably these are not physical pairs, but the point rather is that the
variable being studied can be misidentified when it weakens.

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\beginauthors
\authorsrightcol
L. A. MILONE
Observatorio Astron\'omico
Universidad Nacional de C\'ordoba
C\'ordoba, Argentina
\endauthors

\references

Andrews, P. J., Catchpole, R. M., Feast, M. W., Jones, D. H. P., Lloyd Evans,
T., and Walker, E. N., 1967, {\it IBVS}, No.\,235

Feast, M. W., 1968, ``Non-periodic phenomena in variable stars'', IAU Colloquium,
Budapest, p.\,253

Milone, L. A., 1994, {\it IBVS}, No.\,4002

Milone, L. A., Minniti, E. R., and Paolantonio, S., 1990, {\it IBVS}, No.\,3526

Skiff, B. A., 1994, {\it IBVS}, No.\,4030

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