J/PAZh/40/221 U Sgr BV light curves (Berdnikov+, 2014)
Search for evolutionary changes in the periods of Cepheids: U Sgr.
Berdnikov L.N., Majaess D.
<Pis'ma Astron. Zh. 40, 221 (2014)>
=2014PAZh...40..221B 2014PAZh...40..221B
=2014AstL...40..193B 2014AstL...40..193B
ADC_Keywords: Stars, variable ; Photometry, UBV
Keywords: Cepheids - period variability - stellar evolution
Abstract:
For the classical Cepheid U Sgr, we have constructed an O-C
diagram spanning a time interval of 144 years. The O-C diagram has
the shape of a parabola, which has made it possible to determine for
the first time the quadratic light elements and to calculate the rate
of evolutionary increase in the period, dP/dt=0.39(±0.10)s/yr, in
agreement with the results of theoretical calculations for the third
crossing of the instability strip. The available data reduced by the
Eddington-Plakidis method reveal small random period fluctuations
that do not distort the evolutionary trend in the O-C residuals.
Objects:
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RA (2000) DE Designation(s)
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18 31 53.33 -19 07 30.3 U Sgr = HR 6947
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 17 200 Standard B and V light curves for U Sgr
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See also:
J/AZh/98/299 : FF Aql BV light curves (Berdnikov+, 2014)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 F5.3 --- Phase Phase
7- 11 F5.3 mag Bmag B magnitude
13- 17 F5.3 mag Vmag V magnitude
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Apr-2014