J/A+AS/136/515 DQ Cephei amplitude variations (Li+ 1999)
Multi-period pulsation and amplitude variations behavior in
delta Scuti variable DQ Cephei
Li Z.P., Fang M.J.
<Astron. Astrophys. Suppl. Ser. 136, 515 (1999)>
=1999A&AS..136..515L 1999A&AS..136..515L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Magnitudes
Keywords: stars: delta Scuti - oscillations - individual: DQ Cephei
Abstract:
A period analysis of the data obtained in six nights of differential
photoelectric photometry of the δ Scuti star DQ Cephei (about 42
hours) confirms the pulsation modes of f1=8.0480 cycle per day and
f2=12.6826 cycle per day. The result adjusts well to the
observations that cover a time span of 46 years. Comparing with the
results obtained for different years, we discovered obvious amplitude
variations of the two modes. These amplitude variations show phase
differences of almost 180 degrees. The variation period probably is
longer than 46 years.
Objects:
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RA (2000) DE Designation(s)
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20 57 48.4 +55 29 14 DQ Cep = HD 199908
20 58 27.1 +55 39 00 SAO 33038 = HD 200017
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 23 358 Photoelectric measurements of DQ Cephei
relative to SAO 33038 (1997)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d JHD Heliocentric Julian date
16- 23 F8.5 mag Vmag V magnitude relative to SAO 33038
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Acknowledgements: Li Zhi ping
(End) Patricia Bauer [CDS] 03-Nov-1998