COMMISSIONS 27 AND 42 OF THE IAU 
             INFORMATION BULLETIN ON VARIABLE STARS 
                          Number 3778 
 
                                          Konkoly Observatory 
                                          Budapest 
                                          29 September 1992 

                                          HU ISSN 0374 - 0676 
 
 
             NSV 07453 IS A NEW SHORT PERIOD CEPHEID 
                 OR A LONG PERIOD RR LYRAE STAR 
 
 The variability of NSV 07453=CSV 7263=WR 88 was discovered by Weber 
(1959). The author pointed out the brightness range 12.2m-13.6m and 
the possible type:  Cepheid with the period of about 12d. 
 
 The star was studied on 247 photographic plates obtained during J. D. 
2418528-48394. The chart and the magnitudes of the comparison stars 
are given in Fig. 1 and Table 1 respectively. The analysis of the 
observations revealed that the brightness range is 12.5m-13.8m pg. 
 
 The following elements have been obtained: 
 
       J. D. max = 2441828.36 + 0.929172d x E,    M-m = 0.2p. 
 
 The average light curve constructed with the new elements is given 
Fig. 2. This period is unusual for such an amplitude. Note that the 
one-day alias of this period is equal to 13.3d. This value is very 
close to the period determined by Weber. 
 
 We compiled a sample list from GCSV (Kholopov, 1985) of the stars 
with the period 0.87d<P<1.0d and amplitudes >=1m. The list of these 
stars is given in Table 2. These objects are sometimes called the BL 
Her stars, but BL Her itself has a slightly longer period (P=1.307d). 
There exists a very similar object, FY Vir (Goranskij and Shugarov, 
1979). FY Vir has P=1.082d and the range from 15.7m to 17.3m pg. 
 
 Additional high quality spectroscopic observations are desirable to 
classify this object correctly. 
 
          Table 1 
       Star   B_pg
 
       a     12.58m 
       b     13.07                        
                                      [FIGURE 1] 
       c     13.59 
       d     14.15 
 
     Table 2. Selected GCSV Stars (see text) 
Name          Max-Min     Period    Type   M-m 
 
V900 Aql   14.6m-16m      0.874d    RR     20: 
V524 Her   14.6 -16.2     0.933     RRAB   11 
V742 Cyg   15.9 -16.7     0.93946   CWB    25 
IZ Aps     13.7 -14.7     0.9775    RRAB   20 
EN Pav     15.2 -16.4     0.9775    RRAB   20 
 

                          [FIGURE 2]

             Fig. 2. The mean light curve of NSV 07453



                          S. Yu. SHUGAROV 
                          Sternberg State Astronomical 
                          Institute 
                          119899, Moscow 
                          Russia 
 
References: 
 
Goranskij, V. P., Shugarov, S. Yu.:  1979, Perem. Zvezdy 
  (Prilozhenie), 3, No. 18, 605. (in Russian)  [BIBCODE 1979PZP.....3..605G ]
 
Kholopov, P. N. (ed.):  1985, General Catalogue of Variable Stars, 
  Vols. I-III. 
 
Weber, R.: 1959, J. des Observateurs, 42, 106  [BIBCODE 1959JO.....42..106W ]