J/A+A/440/735 V light curves of EK Dra (Jaervinen+, 2005)
Spots on EK Draconis - Active longitudes and cycles from long-term photometry.
Jaervinen S.P., Berdyugina S.V., Strassmeier K.G.
<Astron. Astrophys. 440, 735 (2005)>
=2005A&A...440..735J 2005A&A...440..735J
ADC_Keywords: Stars, variable ; Photometry
Keywords: stars: activity - stars: starspot
Description:
We analyse photometric observations of the young active dwarf
EK Dra, spanning altogether 21 years, and including previously
unpublished data. The data in Table 2 was observed at the
Fairbourn Observatory in southern Arizona using Amadeus, a 0.75m
automatic photoelectric telescope (APT) of the University of
Vienna. Amadeus is optimised for red wavelengths with an EMI-9828
tube and Johnson-Cousins V(RI)C filters.
Differential V magnitudes are
variable (EK Dra) - comparison (HD 129390) and
check (HD 129798) - comparison (HD 129390).
HD 129390 Vmag=7.567
Objects:
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RA (2000) DE Designation(s)
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14 39 00.2 +64 17 30 EK DRA = V* EK Dra
14 39 22.8 +64 09 14 HD 129390 = BD+64 1018
14 42 03.2 +61 15 43 HD 129798 = V* DL Dra
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 38 2921 The new photometry of EK Dra
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See also:
J/A+AS/125/11 : UBV + V(RI)c photometry of 23 active stars (Strassmeier+ 1997)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star designation (EK Dra or HD 129798)
11- 23 F13.5 d HJD Heliocentric Julian Day
26- 31 F6.3 mag DVmag Differential V magnitude, Star - HD 129390
34- 38 F5.3 mag e_Vmag V1 standard error of mean
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Acknowledgements: Silva Jarvinen, silva.jarvinen(at)iki.fi
(End) Patricia Vannier [CDS] 12-Jul-2005