J/AJ/147/66 Light curves of Algol-type binaries. VII. V404 And (Zhang+, 2014)
Photometric properties for selected Algol-type binaries.
VII. V404 And with magnetic activity.
Zhang L.-Y., Yang Y.-G., Pi Q.-F., Zhu Z.
<Astron. J., 147, 66 (2014)>
=2014AJ....147...66Z 2014AJ....147...66Z
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI ; Photometry, CCD
Keywords: binaries: eclipsing - stars: late-type - starspots
Abstract:
We present new CCD light curves of the short-period Algol-type
eclipsing binary V404 And obtained in 2009-2011. The time-resolving
multiple BVRI color light curves of the year 2011 with full phase
coverage were analyzed simultaneously using the latest Wilson-Devinney
program. We concluded that the configuration of two starspots on the
primary is the most reliable explanation for the light curve
distortions observed in 2011. Based on the new photometric solution,
we further applied the spot model to explain the other light curves,
including the previously published R-band light curves. We revealed
that the starspots changed on a long timescale in terms of the spot
parameters and the differences between Max.I and Max.II. Moreover, the
O-C diagram spanning about 15yr shows an upward parabola, which
indicates a secular increase in the orbital period of V404 And. The
orbital period increases at a rate of dP/dt=5.3(0.3)x10-7days/yr,
which might be interpreted by the angular momentum exchange via
magnetic activity.
Description:
Most of our new CCD photometric observations were carried out on three
runs: three nights on 2009 December 26 and 28 and 2010 January 2, two
nights on 2010 November 22 and 25, and two nights on 2011 October 28
and 29 with the 85cm telescope at the Xinglong station of the National
Astronomical Observatories of China (NAOC). The photometer camera was
equipped with a 1024*1024 pixel CCD and the standard
Johnson-Cousin-Bessell BVRI filters. In addition, three nights of
photometric observations were made on 2010 December 13-15 with the 1m
Cassegrain telescope of Yunnan Astronomical Observatory, China. The
CCD camera has 2048*2048 pixels and uses identical filters.
Objects:
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RA (ICRS) DE Designation(s)
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01 01 24.37 +41 15 00.8 V404 And = GSC 02807-01423 (P=0.67603089)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 84 1264 The new BVRI photometric data of V404 and
in 2009-2011
table4.dat 46 32 The minimum times of V404 And
refs.dat 64 17 References
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2013)
J/AJ/144/136 : BV light curves of V1241 Tauri (Yang+, 2012)
J/AJ/144/50 : Light curves of AV Hya and DZ Cas (Yang+, 2012)
J/AJ/143/13 : Light curves of AL Gem and BM Mon (Yang+, 2012)
J/AJ/139/2669 : CL Aur BVRI light curves (Lee+, 2010)
J/AJ/139/1360 : AO Ser VR light curves (Yang+, 2010)
J/AJ/137/226 : Differential light curves of TV Tri (Yang+, 2009)
J/MNRAS/373/435 : Algol binaries angular momentum evolution (Ibanoglu+, 2006)
J/AJ/131/621 : Catalog of 1022 bright contact binary stars (Gettel+, 2006)
J/A+A/417/263 : Catalogue of Algol type binary stars (Budding+, 2004)
http://var2.astro.cz/EN/ : Eclipsing Binaries Minima Database
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD-B ? Heliocentric Julian Date of B band observation
14- 19 F6.3 mag DBmag ? Differential Johnson B band magnitude
21- 32 F12.4 d HJD-V ? Heliocentric Julian Date of V band observation
34- 39 F6.3 mag DVmag ? Differential Johnson V band magnitude
41- 52 F12.4 d HJD-R ? Heliocentric Julian Date of R band observation
54- 59 F6.3 mag DRmag ? Differential Cousins R band magnitude
61- 72 F12.4 d HJD-I ? Heliocentric Julian Date of I band observation
74- 79 F6.3 mag DImag ? Differential Cousins I band magnitude
81- 84 A4 --- Tel Telescope (1m telescope or 85cm telescope) (1)
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Note (1): Telescopes used are:
85cm = The 85cm telescope at the Xinglong station of the National Astronomical
Observatories of China (NAOC);
1m = The 1m Cassegrain telescope of Yunnan Astronomical Observatory, China.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d HJD Heliocentric Julian Date (HJD-2400000)
13 A1 --- f_HJD [b] Minimum time whose O-C value is higher
than 0.01 and was omitted
15- 20 F6.4 d e_HJD Error in HJD
22 A1 --- A [a] assigned error (1)
24- 29 F6.1 --- Cycle [0.5/8091] Cycle number
31- 36 F6.4 --- O-C1 The (O-C)1 residual
38- 43 F6.4 --- O-C2 The (O-C)2 residual
45- 46 I2 --- Ref Reference; in refs.dat file
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Note (1): If they had no published errors, we had to use the average errors
of our collected data.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference identifier
4- 22 A19 --- BibCode Bibliographic code
24- 41 A18 --- Aut Author's name
43- 64 A22 --- Cat VizieR catalog
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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
Yang et al., Paper VIII, 2014AJ....147..145Y 2014AJ....147..145Y, Cat. J/AJ/147/145
Yang et al., Paper IX, 2016AJ....152...49Y 2016AJ....152...49Y, Cat. J/AJ/152/49
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 09-Sep-2014