COMMISSION 27 OF THE I. A. U.
             INFORMATION BULLETIN ON VARIABLE STARS 
                         Number 2816

                                             Konkoly Observatory
                                             Budapest
                                             6 November 1985

                                             HU ISSN 0374-0676


               NEW TIMES OF MAXIMUM LIGHT OF THE
                    DELTA SCUTI STAR DY Peg


 DY Peg, which was discovered in 1934 (Morgenroth, 1934) has been extensively
studied. (See Mahdy and Szeidl, 1980, for a review of previous references on
this star up to 1979). Since new determinations of maximum light would help in
the determination of its period of pulsation, as well as its period variation,
further observations were carried out.
 The observations were made with the 1 m telescope at the Observatorio de
Tonantzintla, Mexico, with a high speed, two-channel photometer that allows
the observation of the variable and the references stars simultaneously. A
description of the photometer can be found in Nather and Warner (1971).
White light and an integration time of 10 seconds were employed. Table I lists
all the new times of maxima determined and the O-C residuals calculated with
the ephemeris found by Pena and Peniche (1985). With 683 times of maximum light
covering a time span of 46 years they found the following light elements:

        Tmax = 2437178.3729+0.07292633d E - 2.20x(10^-13) E^2
  
  An analysis of the whole data set of the times of maximum light, that would
allow an accurate ephemeris of this star will be published elsewhere.

                      Table I

  Times of maximum light of the Delta Scuti star DY Peg observed in 1984

   Date   Time of Maxima       O-C      Observer

         (HJD-2440000.0)       (d)

 Nov. 3    6007.7784         -0.0008    JHP, RP
     14    6018.7999          0.0039     AQ, AP
     15    6019.5916         -0.0016     AQ, AP
           6019.6634         -0.0027     AQ, AP
     17    6021.6357          0.0001    JHP, RP
     18    6022.5835          0.0003    JHP, RP

Dec. 18    6052.6290          0.0002    JHP
     20    6054.6000          0.0022    MAH, JHP
     21    6055.6180         -0.0008    MAH
     22    6056.6393         -0.0005    MAH





  We would like to acknowledge for the assistance of the following people:
D. Flores fro the heliocentric corrections, R. Escamilla for the typing, and
J. Miller for proofreading.

This is Contribution 184 of the Instituto de Astronomia, UNAM, Mexico.



M.A. HOBART

Facultad de Fisica
Universidad Veracruzana
Ap. Postal 270
Xalapa, Ver.



A. QUINTERO, A. PANI, R. PENICHE,
J. H. PENA

Instituto de Astronomia
U.N.A.M.
Ap. Postal 70-264
Mexico, D.F.


References:

Mahdy, H.A., and Szeidl, B., 1980, Comm.Konkoly Obs. No. 74 [BIBCODE 1980CoKon..74....1M ]
                                                       [CoKon No. 74 ]
Morgenroth, O., 1934, A.N. 252, 394 [BIBCODE 1934AN....252..389M ]
Nather, R.E. and Warner, B., 1971, Mon.Not.Roy.Astr.Soc. 152, 209 [BIBCODE 1971MNRAS.152..209N ]
Pena, J.H. and Peniche, R., 1985, Submitted [BIBCODE 1986A&A...166..211P ]