Access to Astronomical Catalogues

J/A+A/480/187    Differential Stromgren photometry of 15 And  (Dorokhova+, 2008)
The pulsating lambda Bootis star 15 Andromedae: results from a three-site
photometry campaign.
    Dorokhova T. N., Handler G., Dorokhov N. I., Rodriguez E., Udovichenko S. N.
   <Astron. Astrophys. 480, 187 (2008)>
   =2008A&A...480..187D
ADC_Keywords: Stars, Ap; Photometry, uvby ; Photometry, UBV

Keywords: stars: chemically peculiar - stars: individual: HD 221756, HD 220575 -
          stars: oscillations - stars: variables: delta Scuti

Abstract:
    The λ Bootis stars are a chemically peculiar subgroup of main
    sequence A/F stars. Several of these fall into the instability strip
    of the δ Scuti stars and the whole spectroscopic group shows a
    high incidence of pulsational variability.
    We investigated the pulsational behaviour of the λ Bootis star
    15 And (HD 221756) to determine as many intrinsic mode frequencies as
    possible for asteroseismic applications.

Description:
    The data are HJD (Heliocentric Julian Day) versus magnitude
    differences of 15 And relative to the comparison star HD 220575.

    Table 2 contains 338 magnitude differences in Johnson V.
    Telescope: 0.8m Ritchey-Chretien of Astronomical Observatory, Odessa
    National University at the Mt. Dushak-Erekdag Observatory,
    Turkmenistan
    Observers: Dorokhov N. I., Dorokhova T. N.

    Table 3 contains the magnitude differences (Du, Dv, Db, Dy, D(b-y),
    Dm1, Dc1) of 257 simultaneous measurements collected in each of the
    four uvby passbands of the Stromgren photometric system.
    Telescope: 0.9m of the Sierra Nevada Observatory, Spain
    Observer: Rodriguez E.

    Tables 4 contains 998 magnitude differences in Stromgren y.
    Telescope: 0.75m Austrian Automatic Photoelectric Telescope at
    Fairborn Observatory, Arizona.
    Observer: Handler G.

    The observations were carried out in 2003-04 during the multi-site
    campaign. The origin in time is the Julian Day 2452853.
Objects:
    ---------------------------------------------
       RA   (2000)   DE     Designation(s)
    ---------------------------------------------
    23 34 37.5   +40 14 11  15 And = HD 221756
    23 24 34.9   +41 06 46  HD 220575 = HR 8902
    ---------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        29      338   V differential photometry
table3.dat        75      257   uvby differential photometry
table4.dat        29      998   y differential photometry


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   2-  4  I3    ---     Seq       Full data point number
   7- 20  F14.6 d       HJD       Heliocentric Julian date
  24- 29  F6.3  mag     DVmag     Differential Johnson V magnitude


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

   Bytes Format Units   Label     Explanations

   2-  4  I3    ---     Seq       Full data point number
   7- 20  F14.6 d       HJD       Heliocentric Julian date
  22- 27  F6.3  mag     Dumag     Differential u magnitude
  29- 35  F7.4  mag     Dvmag     Differential v magnitude
  37- 43  F7.4  mag     Dbmag     Differential b magnitude
  45- 51  F7.4  mag     Dymag     Differential y magnitude
  53- 59  F7.4  mag     Db-y      Differential b-y colour index
  61- 67  F7.4  mag     Dm1       Differential metallicity index
  69- 75  F7.4  mag     Dc1       Differential luminosity index


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

   Bytes Format Units   Label     Explanations

   2-  4  I3    ---     Seq       Full data point number
   7- 20  F14.6 d       HJD       Heliocentric Julian date
  24- 29  F6.3  mag     Dymag     Differential Stromgren y magnitude


Acknowledgements:
    Gerald Handler, handler(at)astro.univie.ac.at
(End)                                        Patricia Vannier [CDS]  08-Jan-2008