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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
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    unpublished data.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:
    ----------------------------------------------------------
       RA   (2000)   DE    Designation(s)
    ----------------------------------------------------------
    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
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        38     2921   The new photometry of EK Dra


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

   Bytes Format Units   Label     Explanations

   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


Acknowledgements: Silva Jarvinen, silva.jarvinen(at)iki.fi

(End)                                        Patricia Vannier [CDS]  12-Jul-2005