COMMISSION 27 OF THE I. A. U.
            INFORMATION BULLETIN ON VARIABLE STARS
                        Number 3160

                                       Konkoly Observatory
                                       Budapest
                                       18 March 1988

                                       HU ISSN 0374-0676


         THE DISCOVERY OF A BETA LYRAE VARIABLE IN THE
                VISUAL BINARY SYSTEM ADS 14977

  In 1948, Hopmann (1948) listed ADS 14977 (SAO 107139=BD+13d4708) as a
suspected variable. Its variability was confirmed this fall at the Flagstaff
Station with 650 UBV observations obtained with the 1-m Ritchey-Chretien reflector.
The appearance of the light curve, the amplitude and frequency of the
light variation, the spectral type (A2) indicate that the A component of ADS
14977 is an eclipsing binary of the Beta Lyrae type.

  Two primary minima were observed at:
        
        T(1)= 244 6731.6339
        T(2)= 244 7064.6953,

which produced the following light elements:

        T = 244 6730.18247 + 0.7272018d E

  The V observations are plotted in Figure 1. The magnitudes and colours of
the system, as a function of phase, are given in Table I, These data include
the light of the B component (sep.=3.5 arc seconds). Table II lists the
magnitudes and colors of the comparison and check stars.

                   Table I

Magnitudes and Colors of ADS 14977 Aa x B

Phase   V      B-V    U-B
0.00    7.24   0.16   0.04
0.50    7.12   0.12   0.03
0.75    7.05   0.12   0.04


                Table II

Magnitudes and Colors of the Comparison and Check Stars
  
Star                              V    B-V   U-B
Comp. SAO 107132=BD+13 4705      8.65 0.53 -0.04
Check SAO 107134=BD+13 4706      9.68 1.13  0.96

  The UBV data and light curve analysis (SIMPLEX) are being prepared for
publication. Photoelectric CCD observations have been obtained and are being
used to remove the light of the B component in the analysis.


                            [FIGURE 1]



                         R.L. WALKER

                         Flagstaff Station
                         U.S. Naval Observatory
                         Flagstaff, AZ 86002 U.S.A.


Reference:

Hopmann, J.: 1948, Z. Astrophysics, 24, 263. [BIBCODE 1948ZA.....24..263H ]