COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                       Number 3092

                                           Konkoly Observatory
                                           Budapest
                                           5 October 1987

                                           HU ISSN 0374 - 0676



          HD 27503 = LB 3345, A NEW DELTA SCUTI STAR

  In the course of a programme of uvby photometry of faint blue stars, the
star LB 3345 (= HD 27503) from the list by Luyten & Anderson (1959) was noted
as being a probable variable (Kilkenny 1987). A short series of UBV observations
on the night of 1986 December 8/9 is shown in Figure 1 and confirms


                          [FIGURE 1]


the star to be variable. The timescale and amplitude of the variation suggest 
a multiperiodic Delta Scuti star (see, for example, Breger 1979). The
star has been observed as bright as V = 10.54, so the total range of light
variation exceeds 0.1 mag and Luyten & Anderson (1959) give the photographic
magnitude as 12.6, which suggests a larger size still. (There does not
appear to be any other nearby star bright enough to have caused a 
misidentification).
  All data in Fig. 1 have been corrected to photometry of the nearby star,
HD 27444, for which 16 observations give V = 8.824+/-0.004(sd), (B-V) =
+0.536+-0.004, (U-B) = -0.036+-0.004.
  The Stromgren photometry of LB 3345 (Kilkenny 1987) is consistent with
a spectral type ~A2 and puts the star near the blue edge of the Delta Scuti
region of the HR diagram, as outlined by Breger (1979).If LB 3345 is near
the main sequence, it has an absolute magnitude ~+1.3 and thus a distance
of ~0.7 kpc; at a galactic latitude of -38.6 deg the star is then ~ 0.45 kpc
from the galactic plane.




                          DAVID KILKENNY
                          South African Astronomical Obs.
                          P O Box 9
                          Observatory 7935
                          South Africa


References:

Breger, M., 1979.  Publ. astr. Soc. Pacific 91, 5. [BIBCODE 1979PASP...91....5B ]
Kilkenny, D., 1987. Mon. Not. Roy. astr. Soc. (in press). [BIBCODE 1987MNRAS.228..713K ]
Luyten, W.J. & Anderson, J.H., 1959. A search for faint blue stars - XVIII,
  Univ. of Minnesota.