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J/MNRAS/362/1167   Radial velocities of 14 southern Cepheids  (Petterson+, 2005)
A spectroscopic study of bright southern Cepheids -
a high-resolution view of Cepheid atmospheres.
    Petterson O.K.L., Cottrell P.L., Albrow M.D., Fokin A.
   <Mon. Not. R. Astron. Soc., 362, 1167-1182 (2005)>
   =2005MNRAS.362.1167P
ADC_Keywords: Stars, variable ; Radial velocities ; Spectroscopy

Keywords: stellar dynamics - stars: atmospheres - Cepheids


Abstract:
    We present high-resolution spectroscopic observations and
    species-by-species radial velocities of a number of southern Cepheids.
    The stars (BP Cir, V350 Sgr, AX Cir, V636 Sco, W Sgr, S Mus,
    β Dor, TT Aql, Y Oph, YZ Car, SW Vel, X Pup, T Mon and l Car)
    were observed as part of a long-term programme at Mt John University
    Observatory. Radial velocities were determined with the line bisector
    technique, and have a precision of ∼300m/s. Velocity differences as
    large as 30km/s were found for H and Ca II when referenced to the
    metallic line velocity curves, but more subtle variations (of 12km/s)
    were also detected in many other species. Pulsational phase
    anticorrelations are found between lines of Si II and Ba II,
    confirming the propagation time delay between line-forming layers
    producing these two species. We find that the amplitude and phase
    differences between the various species increase with period.

Description:
    Observations were obtained with the 1-m McLellan reflector using the
    high-resolution echelle spectrograph with the Series 200-CCD system

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        81       14   Cepheid periods
tablea.dat        98      418   Velocities


See also:
 J/ApJS/137/209 : Southern Cepheids BVIc photoelectric obs. (Berdnikov+, 2001)


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

   Bytes Format Units   Label     Explanations

   1-  8  A8    ---     Name      Cepheid name
  12- 22  F11.3 JD      Epoch     Epoch
  25- 33  F9.6  d       Per       Period
  37- 81  A45   ---     r_Per     Source for period


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

   Bytes Format Units   Label     Explanations

   1-  8  A8    ---     Name      Cepheid name
  10- 21  F12.4 d       JD        Julian date
  23- 28  F6.4  ---     Phase     [0/1] Phase
  30- 35  F6.2  km/s    RV        ?=- Radial velocity
  37- 42  F6.2  km/s    MVel      Metallic velocity
  44- 49  F6.2  km/s    HaVel     ?=- Hα velocity
  51- 56  F6.2  km/s    CaIIVel   ?=- Ca II velocity
  58- 63  F6.2  km/s    CaIVel    Ca I velocity
  65- 70  F6.2  km/s    BaIIVel   Ba II velocity
  72- 77  F6.2  km/s    FeIVel    Fe I velocity
  79- 84  F6.2  km/s    FeIIVel   ?=- Fe II velocity
  86- 91  F6.2  km/s    SiIVel    Si I velocity
  93- 98  F6.2  km/s    SiIIVel   Si II velocity


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    11-May-2006