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J/A+AS/120/267      T Tauri stars UBrHalphaz photometry (Osterloh+ 1996)
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Detection of periods for T Tauri stars
    Osterloh M., Thommes E., Kania U.
   <Astron. Astrophys. Suppl. Ser. 120, 267 (1996)>
   =1996A&AS..120..267O      (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, pre-main sequence ; Photometry
Keywords: stars: evolution - stars: pre-main sequence - stars: rotation

Abstract:
    We present the results of UBrH_{alpha}_z monitoring of a sample of
    T Tauri stars. The method of differential CCD photometry was applied.
    The observations span a range of ten days and show that eleven out of
    twelve sources varied during this time interval. These variations are
    correlated in all bands. Periods were detected (confidence level
    99.99%) for eight out of eleven variable stars; one additional period
    was found at the 99.9% confidence level. Of those, one (BP Tau) agrees
    with previously published periods; two, GM Aur and IQ Tau, do not; six
    are new detections of periodicities. The sample is drawn from the
    Taurus-Auriga and Cepheus IV star-forming regions.

Central wavelengths and FWHM of the filters used:
    --------------------
    Filter  (nm)   (nm)
    --------------------
       U    370     46
       B    457     96
       r    663    108
       z    910     90
    Halpha  655.4   16.3
    --------------------

Objects:
    -----------------------------------------
       RA   (2000)   DE        Designation(s)
    -----------------------------------------
     04 55 11     +30 22.0     GM Aur
     04 23 39.1   +24 56 15    FT Tau
     04 29 58     +26 07.2     IQ Tau
     04 51 48     +30 47.2     UY Aur
     04 47 48     +29 25.3     DS Tau
     04 38 28.5   +26 10 50    DO Tau
     04 19 14     +29 07.1     BP Tau
     00 42.2      +62 05       LkHa 200
     00 13 29.1   +65 35 59    MacC H9
     23 54 52.1   +66 57 37    MacC sH1
     00 12 54.4   +65 34 08    MacC H10
    -----------------------------------------

File Summary:
--------------------------------------------------------------------------------
  FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe             80        .   This file
table              73     1206   UBrHalphaz photometry (Appendix)
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Byte-by-byte Description of file: table
--------------------------------------------------------------------------------
   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1-  9  A9    ---     Name      Strar name
  11- 16  F6.4  d    JD-2449676   Julian Date-2449676.0
  18- 22  F5.2  mag     Umag      ? magnitude difference in U (1)
  24- 27  F4.2  mag   e_Umag      ? rms uncertainty on Umag
  29- 33  F5.2  mag     Bmag      ? magnitude difference in B (1)
  35- 38  F4.2  mag   e_Bmag      ? rms uncertainty on Bmag
  41- 45  F5.2  mag     rmag      ? magnitude difference in r (1)
  47- 50  F4.2  mag   e_rmag      ? rms uncertainty on rmag
  52- 56  F5.2  mag     Ha        ? magnitude difference in Halpha (1)
  58- 61  F4.2  mag   e_Ha        ? rms uncertainty on Halpha
  63- 67  F5.2  mag     zmag      ? magnitude difference in z (1)
  69- 72  F4.2  mag   e_zmag      ? rms uncertainty on zmag
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Note (1): The magnitude difference represent the photometric changes relative
           to the median value, indicated in the following table.

                    Median absolute brightness
               -----------------------------------
                 Name        U    B      r     z
               -----------------------------------
                 GM Aur    13.20 12.87 10.74  9.89
                 FT Tau    15.01 15.30 12.90 11.15
                 IQ Tau    14.72 14.45 11.88 10.39
                 UY Aur    14.39 14.28 11.80 10.35
                 DS Tau    12.97 13.15 11.35 10.18
                 DO Tau    13.76 14.26 12.00 10.32
                 BP Tau    12.97 13.04 10.81  9.75
                 LkHa 200  15.27 14.67 12.57 11.61
                 MacC H9   16.64 16.01 13.67 12.46
                 MacC sH15 16.02 15.21 12.80 11.41
                 MacC H10  16.50 15.72 13.30 12.11
               -----------------------------------
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Acknowledgements: Martin Osterloh <osterloh@astro.uni-jena.de>
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(End)                                         Patricia Bauer [CDS]   29-Apr-1996