J/A+A/328/235 AN Lyn light maxima (Rodriguez+ 1997)
Multiperiodicity in the atypical Delta Sct star AN Lyn
Rodriguez E., Gonzalez-Bedolla S.F., Rolland A., Costa V.,
Lopez-Gonzalez M.J., Lopez de Coca P.
<Astron. Astrophys. 328, 235 (1997)>
=1997A&A...328..235R 1997A&A...328..235R (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry
Keywords: stars: variables: δ Scu - stars: individual: AN Lyn -
stars: oscillations - techniques: photometric
Abstract:
New uvby data collected of AN Lyn together with the reanalysis of old
data establish that this star is a multiperiodic pulsator. Three
independent frequencies (ν1=10.1756, ν2=18.1309 and
ν3=9.5598c/d) and some interactions between them are found to be
present in the light curve. Changes in amplitude with a large time
scale are confirmed for the main frequency. Moreover, changes in
amplitude are also present for the secondary frequencies, especially
for ν3. After subtraction of the secondary frequencies from the
light curves, the classical O-C method has been used to analyse the
behaviour of the main period. A comparison is made between AN Lyn and
the other two known δ Sct stars with atypical light curves,
i.e., V1719 Cyg and V798 Cyg. New uvby data have been also collected
for V1719 Cyg and the O-C method has been used to analyse the
behaviour of the main period. It is found that the main pulsation of
this star can be well described by means of a linear ephemeris with a
period of P=0.26729700d over the last eighteen years. Finally,
analysis of the different data sets available in the literature do not
reveal significative changes in the amplitude of the main frequency of
V1719 Cyg.
Objects:
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RA (2000) DE Designation(s)
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09 14 28 +42 45.7 AN Lyn = BD+43 1894
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5 32 78 Times of light maxima of the Delta Scuti star AN Lyn
table5.tex 80 88 LaTeX version of table5
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Byte-by-byte Description of file: table5
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Bytes Format Units Label Explanations
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1- 2 I2 --- No Number of the light maximum
4- 15 F12.4 d HJD Heliocentric Julian Day of each light maximum
17- 22 I6 --- Cycle Corresponding cycle number
24- 30 F7.4 --- O-C Residual O-C
32 I1 --- Ref Reference (1)
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Note (1): 1: Yamasaki et al., 1981PASP...93...77Y 1981PASP...93...77Y
2: Pensado, 1983 Bol. Astron. Obs. Madrid, Vol 11, No.2, 3
3: Yamasaki et al., 1983PASP...95..447Y 1983PASP...95..447Y
4: Agerer et al., 1983IBVS.2370....1A 1983IBVS.2370....1A
5: Costa et al., 1984A&AS...57..233C 1984A&AS...57..233C
6: Rodriguez et al., 1997A&A...324..959R 1997A&A...324..959R
7: present work
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Acknowledgements: Eloy Rodriguez
(End) Patricia Bauer [CDS] 11-Dec-1997