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"Peremennye Zvezdy", Prilozhenie, vol. 9, N 14 (2009)

TYC 6849 00019 1, a New Double-Mode Cepheid

A. V. Khruslov
Russia, Tula

ISSN 2221–0474

Received:   16.04.2009;   accepted:   3.06.2009
(E-mail for contact: khruslov@bk.ru)

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Star Name: TYC 6849 00019 1, ASAS 175258-2736.1 Coordinates (J2000): 17 52 58.14, -27 36 00.5 Variability type: CEP(B);   Limits, System: 10.03 - 10.50 (V);     Period: (see Remarks) d;   Epoch: JD (see Remarks)

Remarks:

According to ASAS-3 data (Pojmanski 2002), TYC 6849 00019 1, listed in the ASAS catalog of variable stars as a fundamental mode Cepheid (period 3.3801 d), is actually a double-mode Cepheid. The phased light curves plotted for the following elements: JD(max) = 2453187.24 + 4.82201 x E (fundamental mode) and JD(max) = 2453185.60 + 3.37986 x E (first overtone mode), are given in the Figure. The period ratio P1/P0=0.7009 is typical for beat Cepheids. B - V = 1.523 (Tycho2), J - H = 0.571 (2MASS). ASAS-3 observations were analyzed using the period-search software developed by Dr. V.P. Goranskij for Windows environment. The coordinates are from the Tycho2 catalog.

References:

Pojmanski G., 2002, Acta Astronomica, 52, 397