[vsnet 863] BD+24 719: New RR Lyr-type star?

["Prof. Ivan ANDRONOV" <ila@auriga.ta3.sk>]

BD+24 719 : New RR Lyr-type star ?

The object was found to be variable (7.2-8.3) by K.A.A. and Yu.V.B.
on 171 photovisual plates of the Sky Patrol of the Odessa State
University (JD 2439418-49014).
Co-ordinates (1950): R.A.=4h55m49s, Dec=+24o25'14".
The photovisual brightness of the comparison stars is
BD+23 756 6.68
   23 750 7.89
   23 767 8.93
   23 766 8.45
   23 782 8.46
   24 722 7.61
The periodogram analysis was made by I.L.A. by using the methods of
Lafler and Kinman (1965) and Deeming (1970). Two daily-biased
frequencies f=2.444653 (P=0.4087387d) and 1.443822 (P=0.6926062d)
cycles/day correspond to best one-wave light curves. The object was
most bright at HJD 2445264.5604 (initial epoch). The observations
obtained at JD 2439418-44256 show no variations (except two fadings),
thus it is possible that the variations started after this date.
This may explain why the variability of such bright object was not
discovered earlier.

New observations are needed to determine the correct period and to
check whether the star become variable only after JD 2444256.

Please inform us about Your findings on this object

References:
Deeming T.J.: 1970  M.N.R.A.S., 147, 365.
Lafler J., Kinman T.D.: 1965, Ap.J.Suppl., 11, 216.

K.A.Antoniuk
Yu.V.Beletskij
I.L.Andronov

Department of Astronomy
Odessa State University
T.G.Shevchenko Park
Odessa 270014 Ukraine

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