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J/AZh/84/695    An SX Phoenicis Variable light curve                (Kim+, 2007)

Photometric study of an SX Phoenicis Variable in the Galactic Halo. Kim C., Jeon J.-B., Kim S.-L, Yushchenko A.V. <Astron. Zh. 84, 695 (2007)> =2007AZh....84..695K =2007ARep...51..624K
ADC_Keywords: Stars, variable; Photometry Abstract: We present investigation of V=17mag star, which appears to be SX Phe type variable. Observations at 1.8 and 1.0 meter telescopes of Boyhunsan and Mount Lemon observatories permit us to improve the light elements and to investigate the power spectrum. We applied a Fourier decomposition to the data in order to determine the component frequencies of the synthetic light curve, and five components including a pair of closely separated components of f1=24.6539 and f2=24.8173 c/d were identified. We proposed that one of these two components corresponds to a non-radial oscillation mode. Other observed frequencies are the combinations of the first two. Metallicity of the star was estimated to be [Fe/H]←2. We also found that one of the faint variable stars, No. 14, in the field is RRc type pulsator. Objects: -------------------------------------------------------------------------- RA (2000) DE Designation(s) (files) -------------------------------------------------------------------------- 14 10 57.1 +53 13 36 2-7-0122 = [EHV2002] 2-7-0122 (table1.dat) 14 10 57.3 +53 11 50 No. 14 = USNO-B1.0 1431-0280453 (table4.dat) -------------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 19 1310 Observations of 2-7-0122 (P=0.04056150) table4.dat 19 246 Observations of star No. 14 (P=0.358)
Byte-by-byte Description of file: table1.dat table4.dat
Bytes Format Units Label Explanations
1- 12 F12.4 d JD [2453004/2453144] Julian date 15- 19 F5.3 mag Vamp Amplitude in V band (Vmag-Vmean) (1)
Note (1): Where mean magnitude is Vmag=17.3 for 2-7-0122 star.

(End) Veta Avedisova (INASAN) 03-May-2009
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