COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 2080

                                Konkoly Observatory
                                Budapest
                                1982 February 1

                                HU ISSN 0374-0676




          HD 13831 A NEW BETA CEPHEI STAR


       In the course of a photometric survey of the Hill's
variables in the h & chi Persei galactic cluster the star HD
13831 (=BD + 56d 469, V= 8.26m), which Hill (1967) found 
photometrically constant and used as a photometric standard, was
chosen as comparison star.
       However when we carried out the photometric reduction 
of the data with this star as comparison constant star
a periodic variation appeared.
       Observations were made with the 1.2 m telescope at
Calar Alto in Almeria (Spain) and a cooled standard photoncounting 
photometer with the Stromgren uvby system was used.


                         [FIGURE 1]
                         [FIGURE 2]


  New reductions were made with the star HD 13621(=BD
+ 54d494, V=8.10m, B 0.5 IV) in order to find reliable photometric 
measurement of the variable. In the figures the magnitude 
differences between both stars during the three observation 
nights are represented.
Due to the scarcity of the data we can only say that
apparently there is no colour variation along the cycle of 
about 4.6 hours and that the range of variation is over 0.03m
peak to peak in the three bands measured (u, v and b).
With these properties and its spectral type, B0 IV,
we think that HD 13831 is a Beta Cephei star. Nevertheless its
great v sin i (340 km s^-1 is the adopted value by Hill) makes it
different from the "classical" Beta Cephei stars whose projected
rotational velocities are in average very much smaller.


                 R. GARRIDO

                 A.J. DELGADO

                 Instituto de Astrofisica de Andalucia
                 Apdo. 2144. Granada, Spain
                 Visiting Astronomers, Centro Astronomico
                 Hispano-Aleman. Calar Alto,
                 operated by the Max-Planck-Institut
                 fur Astronomie-Heidelberg.


 Reference:
 Hill, G. 1967, Ap.J. Suppl. Series, 14, 263. [BIBCODE 1967ApJS...14..263H ]