COMMISSION 27 OF THE I. A. U.
            INFORMATION BULLETIN ON VARIABLE STARS
                         Number 3134



                                        Konkoly Observatory
                                        Budapest
                                        21 January 1988

                                        HU ISSN 0374-0676


         VARIABILITY OF THE CARBON STAR BD+51 1329


  In our observational program of IRC objects some poorly investigated C and
S type stars are also included which are close to local IRC standards.

  BD+51 1329 (alpha=7h31.5m, delta=51d37') is a carbon star of spectral type C4,5,
for which Bidelman has noted strong SiC2 bands (Stephenson, 1973), In 
Dearborn survey of faint red stars BD+51 1329 is designated as DO 31774 with
a spectral type of R and magnitude 10.0 (Lee et al., 1947).
  Observations were obtained at the Radioastrophysical observatory in Baldone
using the 55-cm cassegrain telescope and a double-channel photon-counting 
photometer in Johnson system. The comparison stars are BD+51 1327 and 51 1328 
with magnitudes, color indices and spectrum as follows:
    
    BD      HD    V    V-R R-I  Sp
  +51 1327 59721 6.47 0.99 0.67 K0
  +51 1328 59875 8.32 0.63 0.55 G5

Results of VRI observations are given in Table I. Some sporadic observations
in filter B give an amplitude DeltaB = 0.4.
               
  Alksne et al. (1983) noted that strong SiC2 bands appeared mainly in 
irregular or semiregular variables. A diagram R-I versus V-R cannot give
exactly the type of variability but the position of BD+51 1329 indicates a
possible type of Lb or SR.

             Table I
JD2440000+         V    V-R    R-I
3951            10m16   -      1m34
4314             9.88   -      -
4316             9.86   -      1.32
5044            10.35   -      1.31
5061            10.24   -      -
5125            10.30   -      -
5382            10.40   -      -
5404            10.18   1.96   -
5745            10.36   -      -
5747            10.37   -      -
5780            10.18   1.97   1.33
5781            10.20   1.95   -
5825            10.27   1.99   -
5830            10.33   2.00   -
5976            10.25   1.97   -
6020            10.14   1.91   -
6022            10.13   1.96   -
6166            10.13   1.97   -
6468            10.28   2.06   -
6477            10.20   2.00   -
6503            10.25   2.02   -
6534            10.35   2.04   -


  J. KIZLA
Academy of Sciences of the Latvian SSR
Radioastrophysical Observatory
Riga, USSR 226524


References:

Alksne Z., Alksnis A., Dzervitis U., 1983, Properties of carbon stars of the
  Galaxy, Riga "Zinatne", [BIBCODE 1983ccsg.book.....A ]
Lee O.J., Gore G.D., Bartlett, Th.J., 1947, Ann. Dearborn Obs., vol. 5, part IC. [BIBCODE 1947AnDea...5..159L ]
Stephenson, C.B., 1973, Publ. Warner and Swasey Obs. vol. I, No. 4. [BIBCODE 1973PW&SO...1.....S ]