J/AZh/91/299 FF Aql BV light curves (Berdnikov+, 2014)
A search for evolutionary period variations of Cepheids using the Harvard Plate
Stacks: FF Aql.
Berdnikov L.N., Turner D.G., Henden A.A.
<Astron. Zh. 91, 299 (2014)>
=2014AZh....91..299B 2014AZh....91..299B
=2014ARep...58..240B 2014ARep...58..240B
ADC_Keywords: Stars, variable ; Photometry, UBV
Abstract:
Photographic plates of the Harvard Observatory stacks have been used
to obtain 1261 brightness estimates for the low-amplitude Cepheid FF
Aql (P=4.47 days). Combined with published visual, photoelectric,
and CCD observations, these data enable the construction of an O-C
diagram spanning 122 years. The resulting O-C diagram is
parabola-shaped, enabling the determination of quadratic brightness
elements for the first time. The evolutionary rate of increase of the
period, dP/dt=0.072±0.011s/year, is in agreement with
theoretical computations for the third crossing of the instability
strip. The available data, reduced using the technique of by Eddington
and Plakidis, reveal the presence of small, random period
fluctuations, ε=0.0061d±0.0044d, that do not distort the
evolutionary trend of the O-C residuals.
Objects:
----------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------
18 58 14.75 +17 21 39.3 FF Aql = HR 7165
----------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 17 200 Standard B and V light curves of FF Aql
--------------------------------------------------------------------------------
See also:
J/PAZh/40/221 : U Sgr BV light curves (Berdnikov+, 2014)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 F5.3 --- Phase Phase
7- 11 F5.3 mag Bmag B magnitude
13- 17 F5.3 mag Vmag V magnitude
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Apr-2014