J/PAZh/36/600 ASAS 101538-5933.1 BV light curves (Berdnikov, 2010)
Search for evolutionary changes in Cepheid periods using the Harvard plate
collection: ASAS 101538-5933.1.
Berdnikov L.N.
<Pis'ma Astron. Zh. 36, 600 (2010)>
=2010PAZh...36..600B 2010PAZh...36..600B
=2010AstL...36..569B 2010AstL...36..569B
ADC_Keywords: Stars, variable ; Photometry, UBV
Keywords: Cepheids, period variability, stellar evolution
Abstract:
In the plate collection of the Harvard College Observatory, we have
obtained 528 photographic magnitude estimates for the recently
discovered long-period classical Cepheid ASAS 101538-5933.1
(P=51.4-days). Together with the published photoelectric and CCD
observations, our data have allowed us to construct an O-C diagram
spanning a time interval of 120 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=51.8(±4.8)s/yr or
(dP/dt)/P=7.3(±0.7)s, in agreement with the results of theoretical
calculations for the third crossing of the instability strip. The
available data reduced by the method of Eddington and Plakidis reveal
small random period fluctuations that do not distort the evolutionary
trend in the O-C residuals.
Objects:
----------------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------------
10 15 38.0 -59 33 05 ASAS J101538-5933.1 = V* V708 Car
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 19 200 Standard B and V light curves for ASAS 101538-5933.1
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 F5.3 --- Phase Phase
7- 12 F6.3 mag Bmag B magnitude
14- 19 F6.3 mag Vmag V magnitude
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Apr-2013