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J/A+A/383/197     BV light curves of V511 Lyr in 1994-1996     (Lyytinen+, 2002)
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Time series analysis of V511 Lyrae photometry.
    Lyytinen J., Johansson P.,L.Jetsu, Esko E., Hackman T., Hall D.S.,
    Henry G.W., Kontinen S., Koenoenen P., Maisala S., Palviainen A.,
    Ryynaenen K.
   <Astron. Astrophys. 383, 197 (2002)>
   =2002A&A...383..197L
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ADC_Keywords: Stars, variable ; Stars, double and multiple ; Photometry, UBV
Keywords: stars: individual: V511 Lyr (HDE 337518) - stars: variable: general -
          stars: activity - techniques: photometric

Abstract:
    Our time series analysis of sixteen BV light curves of the
    chromospherically active binary V511 Lyr confirmed the 2.7days
    rotation period uniquely. The seasonal periodicity changes of 3.8%
    indicated the presence of detectable surface differential rotation.
    The significant 2.67455days periodicity in the light curve minimum
    epochs suggested that the strongest starspot formation in V511 Lyr was
    concentrated on one stable active longitude.

    The differential BV photometry of V511 Lyr was made between May 1994
    and June 1996 with the Vanderbilt-Tennessee State 0.4m Automated
    Photoelectric Telescope (APT). The comparison and check stars were HDE
    337663 (C1) and HD 179422 (C2).

Objects:
    -----------------------------------------
       RA   (2000)   DE     Designation(s)
    -----------------------------------------
    19 06 21.3   +27 42 48  V511 Lyr
    19 10 30.0   +27 38 18  HDE 337663
    19 11 31.0   +26 44 09  HD 179422
    -----------------------------------------

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe         80        .   This file
table2.dat     29      259   Individual Johnson B and V differential magnitudes
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Byte-by-byte Description of file: table2.dat
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  Bytes Format Units   Label   Explanations
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  1-  2  I2    ---     Set     Subset number from Table 1 (1)
  4- 15  F12.4 d       HJD     Heliocentric Julian Date for each observation.
 17- 22  F6.3  mag     Bmag    ?=99.999 Johnson B differential magnitude, 
                                in the sense variable minus comparison star (2)
 24- 29  F6.3  mag     Vmag    ?=99.999 Johnson V differential magnitude, 
                                in the sense variable minus comparison star (2)
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Note (1): Sets 1 - 17 were all acquired with the T3 0.40m APT at
     Fairborn Observatory.
Note (2): A "99.999" in column 3 or 4 indicates the observation had a 
     large internal error and has been replaced with this dummy value.
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History:
    Copied at http://schwab.tsuniv.edu/t3/v511lyr/v511lyr.html
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(End)                                        Patricia Bauer [CDS]    12-Feb-2002