Access to Astronomical Catalogues

J/A+AS/128/573      ubvyΔa photometry of Renson stars (Maitzen+ 1998)
Δ-a and Stroemgren photometry of stars in the
Renson-catalogue of Ap and Am stars
       Maitzen H.M., Pressberger R., Paunzen E.
      <Astron. Astrophys. Suppl. Ser. 128, 573 (1998)>
      =1998A&AS..128..573M      (SIMBAD/NED BibCode)
ADC_Keywords: Stars, Am ; Stars, Ap ; Photometry, uvby

Keywords: stars: chemically peculiar - stars: early type


Description:
    Results of 131 stars from Renson's (1991, Cat. III/162) catalogue of
    Ap and Am stars observed with the Δ-a system are presented. With
    few exceptions the probability division of Renson for membership in
    the CP2 group of peculiar stars is nicely reflected by peculiar values
    of Δ-a. Comparison with already available Δ-a values
    yields slightly larger values due to a minor shift in the g1 filter
    sampling the depression.
    For a description of the Δ-a and Stroemgren photometric system,
    see e.g. GCPD/75 and GCPD/04, respectively.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat        24      110   Comparison of our photometry with the literature
table4.dat        62      131   Program Stars


See also:
         III/162 : General Catalogue of Ap and Am stars (Renson+ 1991)
         III/199 : Observed Periods of Ap and Bp stars (Catalano+ 1998)
   J/A+AS/121/57 : 4th supp. to the III/199 catalog (Catalano+ 1997)
   J/A+A/378/113 : 5th supp. to the III/199 catalog (Catalano+ 2001)


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1-  5  I5    ---     RNS       Rensons number, as in Cat. III/162
   7- 12  I6    ---     HD        HD number (Cat. III/135)
  14- 16  I3    mmag    d(b-y)    Difference of (b-y)obs to the published values
  18- 20  I3    mmag    d(m1)     Difference of (m1)obs to the published values
  22- 24  I3    mmag    d(c1)     Difference of (c1)obs to the published values


Byte-by-byte Description of file: table4.dat

   Bytes Format Units   Label   Explanations

       1  I1    ---     CP      [0/4] CP class
   3-  4  I2    ---     Nobs    Number of nights
   6- 10  I5    ---     RNS     Rensons number, as in Cat. III/162
  12- 17  I6    ---     HD      HD number (Cat. III/135)
  19- 21  F3.1  mag     Vmag    mag(V) from Renson (1991, Cat. III/162)
  23- 25  I3    mmag    b-y     Observed b-y
  27- 28  I2    mmag    e_b-y   Error of b-y
  30- 32  I3    mmag    m1      Observed m1
  34- 35  I2    mmag    e_m1    Error of m1
  37- 40  I4    mmag    c1      Observed c1
  42- 43  I2    mmag    e_c1    Error of c1
  45- 47  I3    mmag    Da      Observed Δa
      49  I1    mmag    e_Da    Error of Δa
  51- 62  A12   ---     SpType  Spectral type from Renson (1991, Cat. III/162)


Acknowledgements: Ernst Paunzen 

(End)                                         Patricia Bauer [CDS]   05-Feb-1998