J/MNRAS/442/2620 VRI light curve of 5 eclipsing binaries (Zhang+, 2014)
Magnetic activity and orbital periods of five low-mass eclipsing binaries.
Zhang L.-Y., Pi Q.-F., Yang Y.-G.
<Mon. Not. R. Astron. Soc., 442, 2620-2636 (2014)>
=2014MNRAS.442.2620Z 2014MNRAS.442.2620Z
ADC_Keywords: Binaries, eclipsing ; Photometry, VRI
Keywords: binaries: eclipsing - stars: individual: NSVS 02502726 -
stars: individual: NSVS 06550671 - stars: individual: NSVS 11868841 -
stars: individual: NSVS 07453183 - stars: individual: NSVS 10653195
Abstract:
We report 15 new VRI light curves of five low-mass eclipsing binaries
(NSVS 02502726, NSVS 07453183, NSVS 11868841, NSVS 06550671 and NSVS
10653195) that were observed between 2010 and 2012. We analysed our
new data together with three published spectroscopic observations and
seven published light curves using a modified version of the
Wilson-Devinney program. Orbital solutions of the five low-mass
eclipsing binaries were revised and new star-spot parameters were
obtained. We found that spot locations on the five low-mass eclipsing
binaries changed over several years. However, the star-spots for NSVS
07453183 and NSVS 06550671 were stable for several months. More
interestingly, for NSVS 02502726, the spots within a star-spot
longitude region of 180°-360° indicated a magnetic activity
cycle of 5.9(±0.2)yr. Moreover, we detected the first flare-like
event on NSVS 07453183 at phase 0.39. The observations of the
chromospheric activity indicators (Hβ and Hγ lines)
revealed that NSVS 10653195 and NSVS 06550671 were active. For NSVS
02502726, we found a weak continuous secular decrease at a smaller
rate of dp/dt=-2.1(0.8)x10-7d/yr than the previous result. For NSVS
07453183, the O-C times appeared to increase at cycle 6000, and this
was followed by a decrease at cycle 6500.
Description:
In this paper, we carried out new photometric observations of the five
low-mass eclipsing binaries from 2010 to 2012 (NSVS 02502726: 2010
November 26, 27, 28 and 29; 2011 January 29 and 31, and December 10,
11, and 13; 2012 February 18 and 20, and April 3, 6, 7 and 8; NSVS
07453183: 2011 March 22, 24, April 15, 17, and 18, and December 8, 9;
NSVS 11868841: 2010 November 26, 27, 28, 29, and December 11, 12, 13,
15; GSC02314-00530: 2010 November 24; 2011 January 28, and February
1, and December 9; NSVS 10653195: 2012 April 3, 4, 6, 7, and 8) with
an 85cm telescope at Xinglong station of National Astronomical
Observatories of China (NAOC). The photometer was equipped with a
1024x1024 pixel CCD along with Johnson-Cousins B, V, R, I filters.
Our observations were carried out in V, R and I passbands.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 78 5 Calculated periods and epochs
table3.dat 72 2737 VRI photometric observations of the five low
mass eclipsing binaries in 2010-2012
table4.dat 82 35 New minimum times of the five low-mass
eclipsing binaries
table5.dat 62 97 All compiled light minimum times of the low-mass
eclipsing binaries
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See also:
J/ApJ/684/635 : New low-mass eclipsing binary from SDSS-II (Blake+, 2008)
J/MNRAS/401/1141 : NSVS 06507557 VRI differential photometry (Cakirli+, 2010)
J/A+A/526/A29 : ASAS low-mass eclipsing binaries (Helminiak+, 2011)
J/AJ/141/78 : Low-mass eclipsing binaries in KIC (Coughlin+, 2011)
J/AJ/145/16 : Differential BVRI light curves of NSVS 02502726 (Lee+, 2013)
J/AJ/146/35 : BVR light curves of DZ Psc (Yang+, 2013)
J/AJ/149/48 : BVRI light curves of ZZ Eri (Samec+, 2015)
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [NSVS]
5- 12 I08 --- NSVS NSVS star number
14- 15 I2 h RAh Simbad right ascension (J2000)
17- 18 I2 min RAm Simbad right ascension (J2000)
20- 24 F5.2 s RAs Simbad right ascension (J2000)
26 A1 --- DE- Simbad declination sign (J2000)
27- 28 I2 deg DEd Simbad declination (J2000)
30- 31 I2 arcmin DEm Simbad declination (J2000)
33- 36 F4.1 arcsec DEs Simbad declination (J2000)
38- 49 F12.4 d T0 Epoch (HJD)
51- 56 F6.4 d e_T0 [0.0001/0.0014] Error on T0
58- 67 F10.8 d Per [0.19/0.61] Period
69- 78 F10.8 d e_Per [7e-08/2e-07] Error on Per
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [NSVS]
5- 12 I08 --- NSVS NSVS star number
14- 25 F12.4 d HJD-V ? Heliocentric Julian Date of V band observation
27- 32 F6.3 mag dVmag ? Differential V band magnitude
34- 45 F12.4 d HJD-R ? Heliocentric Julian Date of R band observation
47- 52 F6.3 mag dRmag ? Differential R band magnitude
54- 65 F12.4 d HJD-I ? Heliocentric Julian Date of I band observation
67- 72 F6.3 mag dImag ? Differential I band magnitude
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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- 4 A4 --- --- [NSVS]
5- 12 I08 --- NSVS NSVS star number
14- 22 F9.4 d HJDV ?=- Time of minima in V band (HJD-2450000)
24- 29 F6.4 d e_HJDV ?=- Error on HJDV
31- 39 F9.4 d HJDR ?=- Time of minima in R band (HJD-2450000)
41- 46 F6.4 d e_HJDR ?=- Error on HJDR
48- 56 F9.4 d HJDI ?=- Time of minima in I band (HJD-2450000)
58- 63 F6.4 d e_HJDI ?=- Error on HJDI
65- 73 F9.4 d HJD ?=- Mean on VRI time of minima (HJD-2450000)
75- 80 F6.4 d e_HJD ?=- Error on HJD
82 I1 --- Type [1/2] Type of minima (1 = primary, 2 = secondary)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [NSVS]
5- 12 I08 --- NSVS NSVS star number
14- 26 F13.5 d HJD Heliocentric Julian Date of minima time
28- 34 F7.5 d e_HJD ? Error on HJD
36- 38 A3 --- Meth [CDD] Method
40- 46 F7.1 --- Cycle Cycle
48- 53 F6.4 --- O-C Observed minus computed time
55- 60 F6.4 --- Res Residual
62 I1 --- Ref References (1)
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Note (1): References as follows:
1 = Cakirli et al., 2009NewA...14..496C 2009NewA...14..496C
2 = Coughlin & Shaw, 2007JSARA...1....7C 2007JSARA...1....7C
3 = Wolf, 2010, J. ASP Conf. Ser. Vol. 435, 441
4 = present paper
5 = Lee et al., 2013AJ....145...16L 2013AJ....145...16L, Cat. J/AJ/145/16
6 = Paschke & Brat, 2006; http://var.astro.cz/ocgate/
7 = Banfi et al., 2012IBVS.6033....1B 2012IBVS.6033....1B
8 = Kazarovets et al., 1998IBVS.4655....1K 1998IBVS.4655....1K, Cat. II/219
9 = ASAS, Pojmanski, 1998AcA....48...35P 1998AcA....48...35P, Cat. J/AcA/48/35
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Mar-2015