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J/A+AS/145/187           uvby-β photometry of WTTS     (Chavarria-K+, 2000)
Photometric observations of weak-line T Tauri stars.
II. WTTS in Taurus-Auriga, Orion and Scorpius OB2-2.
    Chavarria-K C., Terranegra L., Moreno-Corral M.A., de Lara E.
   <Astron. Astrophys. Suppl. Ser. 145, 187 (2000)>
   =2000A&AS..145..187C
ADC_Keywords: Stars, pre-main sequence ; X-ray sources ; Photometry, uvby, beta

Keywords: stars: activity - stars: evolution - stars: pre-main sequence


Abstract:
    We present uvby-β photometry of 116 X-ray flux-selected active
    stars in the directions of the Orion (40), Taurus-Auriga (58) and
    Scorpius OB2-2 (18) star forming regions. Additionally, we give near
    IR JHK photometry of 20 active stars in the Taurus-Auriga direction.
    The program stars were selected from the ROSAT All Sky Survey and
    EINSTEIN X-ray surveys and are spectroscopically confirmed weak-line T
    Tauri stars and weak-line T Tauri star candidates. The photometry
    confirms the young nature of the program stars and also indicates that
    a significant fraction of the sample could be foreground objects. The
    data given here probably represent the largest homogeneous uvby-β
    photometric sample of new WTTS and WTTS candidates. Many objects in
    the sample are observed photometrically for the first time.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        33       20   JHK photometry of new WTTS in Taurus-Auriga
table2.dat        52       40   uvby-β photometry of the WTTS in Orion
table3.dat        53       58   uvby-β photometry of the WTTS in Taurus-Auriga
table4.dat        52       18   uvby-β photometry of WTTS in Scorpius OB2-2
                              and in Ophiuchus


See also:
    J/A+A/297/391  : T Tauri stars ROSAT survey (Neuhaeuser+, 1995)
    J/A+A/312/439  : New T Tauri stars in Taurus-Auriga (Wichmann+, 1996)
    J/A+AS/123/329 : New weak-line T Tauri stars in Lupus (Krautter+ 1997)
    J/A+AS/132/173 : New weak-line T Tauri stars in Taurus-Auriga (Li+ 1998)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1- 11  A11   ---     Name      RXJ designation
  12- 14  A3    ---     m_Name    Multiplicity index on Name
      15  A1    ---     n_Name    [1-4] Note on RXJ (1)
  17- 21  F5.2  mag     Jmag      J magnitude
  23- 27  F5.2  mag     Hmag      H magnitude
  29- 33  F5.2  mag     Kmag      K magnitude

Note (1): Other names:
       1: RXJ 0425.3+2618 = J4872
       2: RXJ 0433.9+2613 = IT Tau
       3: RXJ 0444.9+2717 = HD 283782
       4: RXJ 0456.6+3150 = HD 282598


Byte-by-byte Description of file: table[234].dat

   Bytes Format Units   Label     Explanations

   1- 11  A11   ---     Name      Designation (RXJ or HD/BD)
      12  A1    ---     m_Name    [ABab] Multiplicity index on Name
      13  A1    ---     n_Name    [l+*w] Note on  RXJ (1)
  15- 18  A4    ---     SpType    Spectral type
  20- 24  F5.2  mag     Vmag      V magnitude
  26- 29  F4.2  mag     b-y       b-y colour index
  31- 35  F5.2  mag     m1        ? m1 colour index
  37- 41  F5.2  mag     c1        c1 colour index
      42  A1    ---     u_c1      Uncertainty flag on c1
  44- 47  F4.2  mag     beta      ? β index
  49- 52  F4.2  mag     AV        Absorption in V band

Note (1): l: After A96, the presence of LiI 6707Å dubious because of the low
              S/N ratio of the spectrogram.
          +: Classified as WTTS by Wichmann (1994, Ph.D. Dissertation,
                                              Heidelberg, Germany)
          *: 04253+2618, SpType = M0, W(Hα)=-2.26, = J4872
          w: CTTS, after Walter, 1986ApJ...306..573W


History: From A&A electronic version


References:
    Alcala et al., Paper I          1996A&AS..119....7A
(End)                                        Patricia Bauer [CDS]    26-Jul-2000