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[vsnet-chat 660] DG Per: Orbital period corrected

DG Per: Orbital period corrected

DG Per was discovered by C.Hoffmeister (Veroeff. Sternw. Sonneberg,
1947, Bd. 1, H. 2) who listed 8 moments of weakenings and
estimated the period of 56.770 days listed in the GCVS IV.
By using for the analysis the linear squares fit (program PERMIN by
Andronov I.L., Odessa Astronomical Publications,
1994, v.7, p.49), we have obtained the linear elements:
Min = 2429511.15 +   56.793 * E
      +/-    .31+/-    .020
Here the period slightly differs from the GCVS value.

   The star was measured by K.A. on 190 negatives of the plate collection
of the Astronomical Observatory of the Odessa State University
covering the period JD 2440479-48945. 9 weakenings were detected
corresponding to the linear elements:
JD  = 2445853.63 +  56.7517 * E
      +/-    .32 +/-  .0071

By using all 17 moments we have obtained much more precise
elements:
JD = 2438193.09 +   56.7454 * E
  +/-       .25 +/-   .0017

The range of brightness variations 13.12-13.70.

The authors are thankful to Prof. N.N.Samus' for helpful discussions.

Kirill A. Antonyuk
Ivan L. Andronov

Department of Astronomy
Odessa State University
T.G.Shevchenko Park
Odessa 270014 Ukraine
astro@paco.odessa.ua

Appendix: moments of weakenings (HJD 2400000+)
  T       O-C
28035.36  -.31 Hoffmeister
28545.27 -1.11
29112.53 -1.30
29170.41  -.16
29851.50  -.02
30023.40  1.64
30589.40   .19
30704.50  1.80
41598.45   .64 This work
41596.49 -1.32
44490.53 -1.30
48179.45  -.83
46081.22   .52
46762.37   .73
48181.44  1.16
48918.44   .47
47044.56  -.81

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