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J/A+A/477/907       Beta Cephei stars in the ASAS-3 data. I.   (Pigulski+, 2008)
Beta Cephei stars in the ASAS-3 data.
I. Long-term variations of periods and amplitudes.
    Pigulski A., Pojmanski G.
   <Astron. Astrophys. 477, 907 (2008)>
   =2008A&A...477..907P
ADC_Keywords: Stars, early-type - Stars, OB - Stars, variable - Surveys

Keywords: stars: early-type - stars: oscillations - surveys


Abstract:
    We analyse V-filter photometry of 41 known Beta Cephei-type stars. The
    ASAS-3 photometry is combined with the archival data, if available, to
    determine long-term stability of periods and amplitudes of excited
    modes. We detected amplitude changes in three Beta Cephei stars,
    BW Cru, V836 Cen, and V348 Nor. Period changes were found in KK Vel
    and V836 Cen. Our analysis shows that intrinsic period changes are
    more common among multiperiodic stars, apparently because they are
    caused by some kind of mode interaction. In addition, we found new
    modes for seven stars, and for ten others we provide new solutions or
    remove ambiguities in the detected frequencies. One candidate hybrid
    Beta Cephei/SPB star, HD 133823, is discovered.

Description:
    Time-series V-filter ASAS-3 photometry for 41 known Beta Cephei stars
    is presented. Out of the original aperture photometry, we chosen that
    which had the smallest errors of magnitudes. In addition, measurements
    made in different fields were accounted for zero point differences,
    corrected for second-order extinction effects and detrended.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
stars.dat        148       41   Stars observed: names, and first mode parameters
                            (table1 and excerpts from table2 of paper)
lc1.dat           42    16374   Time-series photometry


See also:
        II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+ 2002-05)
 J/A+A/477/917 : Beta Cephei stars in the ASAS-3 data. II. (Pigulski+, 2007)


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

   Bytes Format Units   Label     Explanations

   1- 11  A11   ---     Star      Star name
  13- 18  I6    ---     HD        ? HD number of the star (Cat. III/135)
  20- 27  A8    ---     DM        BD/CPD star number
  29- 41  A13   ---     ASAS-3    ASAS-3 number (Cat. II/264)
  43- 53  A11   ---     Oname     Other name of the star
      56  I1    ---     Modes     Number of variation modes found
  58- 62  F5.2  mag     Vmag      Johnson V magnitude
  64- 68  F5.2  mag     B-V       ? Color index (B-V)
  70- 74  F5.2  mag     U-B       ? Color index (U-B)
  76- 85  A10   ---     SpType    MK spectral type
  87- 88  I2    ---     r_SpType  ? Reference of spectral type (1)
  90- 92  I3    ---     Nobs      Number of observations
  95-102  F8.6  d-1     f1        Frequency of first mode
 104-108  E5.0  d-1     e_f1      Mean error on f1
 111-114  F4.1  mmag    A1        ? Amplitude of first mode
 116-118  F3.1  mmag    e_A1      ? Mean error on A1
 121-148  A28   ---     Rem       Remarks

Note (1): references to the MK spectral types as follows:
      1 = Garrison et al. (1977ApJS...35..111G)
      2 = Houk (1982, Cat. III/80),
      3 = Houk (1978, Cat. III/51),
      4 = Houk & Cowley (1975, Cat. III/31),
      5 = Evans et al. (2005A&A...437..467E),
      6 = Schild (1970ApJ...161..855S),
      7 = Hill (1970MNRAS.150...23H),
      8 = L'epine et al. (2001AJ....122.3407L),
      9 = Hill et al. (1974MNRAS.168..451H),
     10 = Morgan et al. (1953ApJ...118..318M),
     11 = Walborn (1971ApJS...23..257W),
     12 = Kilkenny et al. (1977MNRAS.178..123K),
     13 = FitzGerald (1987MNRAS.229..227F),
     14 = Whiteoak (1963MNRAS.125..105W),
     15 = spectral type on the Harvard system, Nesterov et al.
          (1995A&AS..110..367N, Cat. III/182),
     16 = Houk & Smith-Moore (Cat. III/133).


Byte-by-byte Description of file: lc1.dat

   Bytes Format Units   Label    Explanations

   1- 11  A11   ---     Star     Star name
  13- 25  F13.5 d       HJD      Heliocentric Julian Day
  28- 34  F7.4  mag     Vmag     Johnson V-filter magnitude
  38- 42  F5.3  mag     e_Vmag   Error of Vmag, copied from original measurement


Acknowledgements:
    Andrzej Pigulski, pigulski(at)astro.uni.wroc.pl
(End)       Andrzej Pigulski  [UWr, Poland], Patricia Vannier [CDS]  04-Dec-2007