J/A+A/542/A38 LQ Hya V-band differential light curve (Lehtinen+, 2012)
Spot activity of LQ Hya from photometry between 1988 and 2011.
Lehtinen J., Jetsu L., Hackman T., Kajatkari P., Henry G.W.
<Astron. Astrophys. 542, A38 (2012)>
=2012A&A...542A..38L 2012A&A...542A..38L
ADC_Keywords: Stars, variable
Keywords: stars: activity - starspots - stars: individual: LQ Hya
Abstract:
We perform detailed time series analysis for V-band photometry of the
young active star LQ Hya to investigate the characteristics of its
magnetic activity in both long and short time scale and also to
estimate its differential rotation.
Description:
The included files present the numerical data of our analysis of the
LQ Hya photometry. The data consists of differential Johnson V-band
photometry using the star HD 82477 as the comparison star.
The analysis has been performed using our previously published
continuous period search (CPS) method, described in detail in Lehtinen
et al., 2011. Cat. J/A+A/527/A136.
Objects:
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RA (2000) DE Designation(s)
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09 32 25.57 -11 11 04.7 V* LQ Hya = HD 82558
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lqhya.dat 19 2675 Differential photometry of LQ Hya
results.dat 185 1079 *Numerical results of the CPS analysis
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Note on results.dat: Each line consists of numerical results for one single
dataset.
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See also:
J/A+A/527/A136 : HD 116956 V-band differential light curve (Lehtinen+, 2011)
Byte-by-byte Description of file: lqhya.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliodentric Julian Date
15- 19 F5.3 mag dVmag Differential V-band photometry
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Byte-by-byte Description of file: results.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- SEG [1/26] Segment number
4- 13 F10.4 d t0 1st timepoint in SEG (1)
15- 16 I2 --- SET [1-93] Dataset number
18- 27 F10.4 d t1 1st timepoint in SET (1)
29- 38 F10.4 d tn Last timepoint in SET (1)
40- 49 F10.4 d tau Mean epoch of SET (1)
51 I1 --- IND [0/1] Independency of SET (0=non-independent)
53- 54 I2 --- n Number of observations in SET
56- 62 F7.4 mag my Mean of observations in SET
64- 70 F7.4 mag e_my Stdev of observations in SET
72 I1 --- K [0/2] Light curve modelling order
74- 80 F7.4 mag se Stdev of residuals
82- 89 F8.4 d TC Timescale of change
91- 97 F7.4 mag M ?=-1 Light curve mean
99-105 F7.4 mag e_M ?=-1 Error of M
107 I1 --- q_M [0/1] Reliability of M (1=unreliable)
109-115 F7.4 d Per ?=-1 Period of light curve
117-123 F7.4 d e_Per ?=-1 Error of Per
125 I1 --- q_Per [0/1] Reliability of Per (1=unreliable)
127-133 F7.4 mag Amp ?=-1 Light curve amplitude
135-141 F7.4 mag e_Amp ?=-1 Error of Amp
143 I1 --- q_Amp [0/1] Reliability of Amp (1=unreliable)
145-154 F10.4 d tmin1 ?=-1 Epoch of the primary minimum (1)
156-162 F7.4 d e_tmin1 ?=-1 Error of tmin1
164 I1 --- q_tmin1 [0/1] Reliability of tmin1 (1=unreliable)
166-175 F10.4 d tmin2 ?=-1 Epoch of the secondary minimum (1)
177-183 F7.4 d e_tmin2 ?=-1 Error of tmin2
185 I1 --- q_tmin2 [0/1] Reliability of tmin2 (1=unreliable)
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Note (1): All timepoints are Heliocentric Julian Dates given in HJD-2400000.
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Acknowledgements:
Jyri Lehtinen, jyri.j.lehtinen(at)helsinki.fi
(End) Patricia Vannier [CDS] 15-May-2012