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J/A+AS/119/281      UBV(RI)c photometry of active stars. (Cutispoto, 1996)
Long-term monitoring of active stars. V. UBV(RI)c photometry collected in
Feb-Mar 1990.
      Cutispoto G.
     <Astron. Astrophys. Suppl. Ser. 119, 281 (1996)>
     =1996A&AS..119..281C      (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry, UBVRI ; Photometry, Cousins

Keywords: stars: activity - stars: late-type - stars: variables


Description:
    High-precision UBV(RI)c photometry of 12 selected active stars,
    collected at the European Southern Observatory (La Silla, Chile) over
    the period February-March 1990, is presented. Significant evolution
    of the light curves, period variations and, in most cases, evidence
    for long-term variability of the global degree of spottedness are
    found. Some of the spectral classifications are discussed. This paper
    is part of a more extensive program focusing on the global properties
    and evolution of active stars and is aimed at establishing a
    time-extended photometric database which can give important clues on
    topics such as the stability of the spotted areas, differential
    rotation and solar-like cycles.
    For a description of the UBV and (RI)c photometric systems, see e.g.
    General Catalog of Photometric Data GCPD/01 and GCPD/54.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table            115      127   UBVRI photometry


See also:
   J/A+AS/121/369 : UBVRI observations of active stars. VI. (Cutispoto, 1997)
   J/A+AS/127/207 : UBV(RI)c photometry of active stars. VII. (Cutispoto, 1998)
   J/A+AS/131/321 : UBV(RI)c photometry of active stars. VIII. (Cutispoto, 1998)
   J/A+A/367/910  : UBV(RI)c photometry of active stars. IX. (Cutispoto+, 2001)
   J/A+A/400/659  : UBV(RI)c photometry of active stars. X (Cutispoto+, 1003)


Byte-by-byte Description of file: table

   Bytes Format Units   Label     Explanations

   1-  9  A9    ---     HD        HD number
  13- 20  A8    ---     Name      Other name
  22- 43  A22   ---     Date      Observation period
  46- 57  F12.4 d       HJD       Heliocentric Julian day
  61- 65  F5.4  ---     Phase     [0/1[ Corresponding phase (1)
  71- 75  F5.3  mag     Vmag      V magnitude
  81- 85  F5.3  mag     U-B       ? U-B color index
  91- 95  F5.3  mag     B-V       B-V color index
 101-105  F5.3  mag     V-Rc      V-Rc color index
 111-115  F5.3  mag     V-Ic      V-Ic color index

Note (1): The phases are computed by using the following ephemeris:
           HD 26354  = AG Dor,   HJD = 2447587.52 + 2.533 x E
           HD 45088  = OU Gem,   HJD = 2443846.2 + 7.36 x E
           HD 82558  = LQ Hya,   HJD = 2445275.993 + 1.6092 x E
           HD 98712  = SZ Crt,   HJD = 2441389.0 + 11.58 x E
           HD 101309 = V829 Cen, HJD = 2447570.53 + 11.65 x E
           HD 102077 = V838 Cen, HJD = 2445805.4 + 1.88 x E
           HD 106225 = HU Vir,   HJD = 2445214.7 + 10.50 x E
           HD 119285 = V851 Cen, HJD = 2447949.5 + 11.50 x E
           HD 127535 = V841 Cen, HJD = 2445804.1 + 5.929 x E
           HD 136905 = GX Lib,   HJD = 2445061.901 + 11.13448 x E
           HD 139084 = V343 Nor, HJD = 2445801.9 + 4.25 x E
           HD 155555 = V824 Ara, HJD = 2445803.07 + 1.681652 x E


Courtesy: G. Cutispoto 


References:
   Rodono & Cutispoto, Paper I      1992A&AS...95...55R
   Cutispoto           Paper II     1992A&AS...95..397C
   Cutispoto           Paper III    1993A&AS..102..655C
   Cutispoto           Paper IV     1995A&AS..111..507C
   Cutispoto & Leto    Paper VI     1997A&AS..121..369C, Cat. J/A+AS/121/369
   Cutispoto           Paper VII    1998A&AS..127..207C, Cat. J/A+AS/127/207
   Cutispoto           Paper VIII   1998A&AS..131..321C, Cat. J/A+AS/131/321
   Cutispoto et al.,   Paper IX     2001A&A...367..910C, Cat. J/A+A/367/910
   Cutispoto et al.,   Paper X      2003A&A...400..659C, Cat. J/A+A/400/659
(End)                                         Patricia Bauer [CDS]   26-Apr-1996