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J/AJ/106/2058 Karle observations of V505 Sgr (Chambliss+, 1993)
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A photometric investigation of the eclipsing binary V505 Sagittarii.
Chambliss C.R., Walker R.L., Karle J.H., Snodgrass H.B., Vracko Y.A.
<Astron. J. 106, 2058 (1993)>
=1993AJ....106.2058C
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ADC_Keywords: Binaries, eclipsing ; Stars, variable
Abstract:
V505 Sgr is a classical Algol system consisting of an A2 V primary and
a G5 IV secondary that fills its Roche lobe. New times of minimum
light are presented. The period of the eclipsing system (1.18287d)
varies, due in part to an orbital light-time effect. A third component
has been detected that orbits the eclipsing pair. This investigation
uses the SIMPLEX algorithm [Kallrath & Linnell, ApJ, 313, 346 (1987)]
and the Differential Correction code [Wilson, ApJ, 234, 1054 (1979)]
to analyze two separate datasets. The results indicate the third
component, an F8 V star, contributes about 5% of the light to the
system. The minimum projected distance between the third component and
the eclipsing pair is 37 AU. This implies an orbital period of about
105 years, a value that differs with the O-C data. The photometric
solution, combined with recent spectroscopic data, yields
R(1)=2.14R(Sun) and R(2)=2.24R(Sun) and M(1)=2.20M(Sun) and
M(2)=1.15M(Sun).
Description:
Karle observations of V505 Sgr
The table contains a listing of 1074 observations of V505 Sagittarii
which were made by Karle during 29 nights in 1960 and 1961 with a
25-cm reflector at the Lewis and Clark College in Portland, Oregon. An
RCA 1P21 photomultiplier was used, and the comparison star was HD
187664. The observations were unfiltered, and C.R. Chambliss and
R.L. Walker have estimated the effective wavelength to be 4600A.
These observations were not corrected for differential extinction.
The reductions for time and for delta-magnitude were made by
Yura Vracko in 1990.
Karle observed nine times of primary minimum light and one time of
secondary minimum. These were determined by Chambliss and Walker using
the method of Kwee and van Woerden (1956), and they are listed in the
printed paper. A least squares solution for these times of minimum
light yielded the following ephemeris:
T(min) = JD 2437108.8818 + 1.1828637 E.
This ephemeris has been used to calculate the phases and phase angles
which appear in this table.
Objects:
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RA (2000) DE Designation(s)
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19 53 06.3 -14 36 08 V505 Sgr = HD 187949 = HR 7571
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table 38 1077 Karle observations of V505 Sgr
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Byte-by-byte Description of file: table
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian Date
15- 21 F7.5 --- Phase [0/1[ Phase
24- 30 F7.3 deg Angle [0/360[ Phase angle
33- 38 F6.3 mag Delta Delta magnitude
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Origin: AAS CD-ROM series, Volume 1, 1993
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(End) [CDS] 21-Feb-1996