J/AJ/152/49 Algol-type binaries. IX. V548 Cyg (Yang+, 2016)
Photometric properties of selected Algol-type binaries. IX. V548 Cygni.
Yang Y.-G., Wu C., Van Hamme W., Hu J.-Y., Wei J.-Y.
<Astron. J., 152, 49-49 (2016)>
=2016AJ....152...49Y 2016AJ....152...49Y (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Binaries, eclipsing ; Binaries, spectroscopic ;
Photometry
Keywords: binaries: eclipsing - binaries: spectroscopic -
stars: individual (V548 Cyg)
Abstract:
We present a new UV light curve of the Algol eclipsing binary V548 Cyg
obtained with the Lunar Ultraviolet Telescope. We model the UV light
curve together with two previously published (B and V) light curves,
primary star radial velocities, and eclipse timings in a unified
multi-data-type solution and determine orbital parameters and absolute
dimensions. Timing residuals hint at the presence of a third star in
the system. This star is possibly the source of the third light that
is needed to obtain a good fit to each of the light curves
simultaneously. The light-time oscillation in the timing residuals has
a period of either ∼19 or ∼46years. The third body orbit inclination
would have to be low (23° or 15°, respectively) for the third
star to have a mass of ∼1.5M☉, which would be expected for a
main-sequence star of color B-V∼0.32, as determined from the light
curve solution. In an H-R diagram, the mass-gaining, primary component
of V548 Cyg is located between the zero-age and terminal-age main
sequence for solar composition stars, and close to the 0.4Gyr
isochrone.
Description:
The UV photometry of V548 Cyg was obtained in 2014 May 13-14 with the
Lunar Ultraviolet Telescope (LUT), which is a component of the Chinese
Chang'e-3 lander and rover mission to the Moon (Ip et al.,
2014RAA....14.1511I 2014RAA....14.1511I). We obtained a total of 1417 images (see Table2).
Objects:
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RA (ICRS) DE Designation(s) (Period)
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19 56 58.31 +54 47 58.3 V* V548 Cyg = AG+54 1274 (P=1.80523838)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 20 1416 Lunar Ultraviolet Telescope (LUT) light curve
of V548 Cyg
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
J/AN/334/860 : Catalogue of eclipsing variables. V2 (Avvakumova+, 2013)
J/other/JAVSO/39.23 : Maxima of short period pulsating stars (Samolyk+, 2011)
J/other/JAVSO/38.183 : Time of minima of eclipsing binaries (Samolyk+, 2010)
J/other/IBVS/5761 : Minima and maxima of 389 variables (Hubscher+, 2007)
J/AcA/54/207 : Ephemerids of eclipsing binaries (Kreiner, 2004)
J/A+A/417/263 : Catalogue of Algol type binary stars (Budding+, 2004)
J/other/IBVS/5296 : Extrema of pulsating stars (Agerer+, 2002)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian Date of observation
15- 20 F6.3 mag dmag [0.297/1.411] Differential LUT band magnitude (1)
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Note (1): Differential magnitudes are in the sense Variable-Comparison, with
HD189234 as the comparison star. HD189370 was selected as a check star. The
RMS scatter of the differential light curve is ∼0.03mag. The Lunar
Ultraviolet Telescope (LUT) is a component of the Chinese Chang'e-3 lander
and rover mission to the Moon. The LUT normalized throughput is shown in
Figure1.
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History:
From electronic version of the journal
References:
Yang & Wei, Paper I 2009AJ....137..226Y 2009AJ....137..226Y, Cat. J/AJ/137/226
Yang et al., Paper II 2010AJ....139.1360Y 2010AJ....139.1360Y, Cat. J/AJ/139/1360
Yang et al., Paper III 2012AJ....143...13Y 2012AJ....143...13Y, Cat. J/AJ/143/13
Yang et al., Paper IV 2012AJ....144...50Y 2012AJ....144...50Y, Cat. J/AJ/144/50
Yang et al., Paper V 2012AJ....144..136Y 2012AJ....144..136Y, Cat. J/AJ/144/136
Yang et al., Paper VI 2014AJ....147...35Y 2014AJ....147...35Y, Cat. J/AJ/147/35
Zhang et al., Paper VII 2014AJ....147...66Z 2014AJ....147...66Z, Cat. J/AJ/147/66
Yang et al., Paper VIII 2014AJ....147..145Y 2014AJ....147..145Y, Cat. J/AJ/147/145
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 13-Sep-2016