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Peremennye Zvezdy (Variable Stars) 28, No. 10, 2008 Received 28 May; accepted 17 December.
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Article in PDF |
The New Double-Mode RR Lyrae Variable USNO-A2.0 1650-01540181
T. Kryachko1, A. Samokhvalov2, B. Satovskiy1
- Astrotel Observatory, Karachay-Cherkessiya, Russia,
e-mail: bredfild@mail.ru; bs25@mail.ru
- Surgut, Russia, e-mail: sav@surgut.ru
| We present our discovery of a new double-mode RR Lyrae variable, USNO-A2.0 1650-01540181. The study is based on our original CCD observations, carried out at the Astrotel-Caucasus Observatory. |
We present our discovery of a new double-mode RR Lyrae variable
star USNO-A2.01650-01540181 (
= 11
41
14
27,
= +75
42
22
2, J2000.0, 2MASS). All
observations were carried out at the Astrotel-Caucasus observatory
with a 300-mm Ritchey-Chretien astrograph, equipped with an
unfiltered SBIG STL-11000 CCD camera. A total of 531 images, with
5-minute exposure times, were acquired between JD2454459 and
JD2454533. Basic reductions of images for dark current, flat
fields, and bias were carried out with the MaxIm DL software. To
search for new variables, we use the VaST software (Sokolovsky and
Lebedev, 2005), and for differential aperture photometry, CCDSoft
(http://www.bisque.com/ Products/CCDSoft/). The comparison star
was GSC 4550-01695 and the check star, GSC 4550-01659. We analyzed
our observations using the Peranso 2.31 software. We revealed two
periods: the fundamental mode period,
, and
the first-overtone period,
. The ratio
is typical of double-mode RR Lyrae variable stars
(McClusky, 2008).
Fugures 2-5 display the phased light curves for the following
elements:
.
.
Acknowledgements: We would like to thank S.V. Antipin and N.N. Samus for helpful discussion and K.V. Sokolovsky and A.A. Lebedev for the VaST software.
References:
McClusky, J.V., 2008, IBVS No.5825
Sokolovsky, K., Lebedev, A., 2005, in 12th Young Scientists' Conference on Astronomy and Space Physics, Kyiv, Ukraine, April 19-23, 2005, eds.: Simon, A.; Golovin, A., p.79