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J/ApJ/479/427       Abundance Analyses of RV Tauri Variables (Gonzalez+ 1997)
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Abundance Analyses of the Field RV Tauri Variables: EP Lyrae, DY Orionis,
AR Puppis, and R Sagittae
     Gonzalez G., Lambert D.L., Giridhar S.
    <Astrophys. J. 479, 427 (1997)>
    =1997ApJ...479..427G
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ADC_Keywords: Stars, variable ; Abundances ; Stars, horizontal branch
Keywords: stars: abundances - stars: AGB and post-AGB -
          stars: variables: other (RV Tauri)

Abstract:
    Analyses of the photospheric compositions of the four field RV Tauri
    stars, EP Lyr, DY Ori, AR Pup, and R Sge, indicate that to varying
    degrees they have experienced fractionation processes that have
    preferentially depleted their atmospheres of elements with high
    condensation temperatures. The depletion, as indicated by, for
    instance, [S/Fe], is greatest for DY Ori, [S/Fe]=2.5, and least for
    R Sge, [S/Fe]=0.9. The initial composition, presumably indicated by
    the sulfur abundance, was nearly solar for AR Pup, R Sge, and DY Ori,
    while it was about 0.6--- less than solar for EP Lyr. This implies
    that the RV Tauri stars as a group may not be as metal-poor as
    previously thought---they are instead ``metal-depleted''. The field RV
    Tauri's are not halo stars, but probably belong to the thick disk.
    This brings to seven the number of type II Cepheids that show such a
    trend; the other three are IW Car and V1 in omega Cen, RV Tauri stars,
    and ST Pup, a W Virginis star. The 12C/13C ratios for EP Lyr and DY
    Ori are 9+/-1 and 6+/-3, respectively, indicating that CN-cycled
    material has been mixed with their surface layers. This is consistent
    with the general consensus that RV Tau stars are in a post-AGB
    evolutionary stage. There is also evidence that EP Lyr has a stellar
    mass companion, but additional observations are required to calculate
    an orbit; hence, EP Lyr could be a link to the group of
    metal-depleted, high-latitude A-F supergiants, all of which are
    binaries.

Objects:
    ----------------------------------------------------------
        RA   (2000)  DE      Designation(s)
    ----------------------------------------------------------
    19 18 19.4   +27 51 03   EP Lyr
    20 14 03.7   +16 43 35   R Sge = HD 192388
    ----------------------------------------------------------

File Summary:
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 FileName     Lrecl      Records       Explanations
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ReadMe           80            .       This file
table3.dat       68          211       Individual abundance results for EP Lyr
table3.tex       64          257       AASTeX version of table3
table6.dat       76          112       Individual abundance results for R Sge
table6.tex       75          153       AASTeX version of table6
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Byte-by-byte Description of file: table3.dat
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   Bytes Format  Units       Label      Explanations
--------------------------------------------------------------------------------
   1-  5  A5     ---         Ion        Atomic species
   7- 11  F5.2   ---     log(Eps0)      Solar abundance for the ion
  13- 19  F7.2   0.1nm       lambda     Wavelength
  21- 25  F5.2   eV          EP         Low energy potential
  27- 32  F6.2   ---     log(gf)        log of oscillator strength
  35- 39  F5.1   10-4nm      EW1        ? Equivalent width, 1994 June 25-27
  41- 44  F4.2   ---     log(Eps1)      ? Abundance at lambda, 1994 June 25-27
  47- 51  F5.1   10-4nm      EW2        ? Equivalent width, 1995 June 10&12
  53- 57  F5.2   ---     log(Eps2)      ? Abundance at lambda, 1995 June 10&12
  60- 62  I3     10-4nm      EW3        ? Equivalent width, 1996 Mar 3
  64- 68  F5.2   ---     log(Eps3)      ? Abundance at lambda, 1996 Mar 3
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Byte-by-byte Description of file: table6.dat
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   Bytes Format  Units       Label      Explanations
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   1-  5  A5     ---         Ion        Atomic species
   7- 11  F5.2   ---     log(Eps0)      Solar abundance for the ion
  13- 19  F7.2   0.1nm       lambda     Wavelength
  21- 25  F5.2   eV          EP         Low energy potential
  27- 32  F6.2   ---     log(gf)        log of oscillator strength
  35- 37  I3     10-4nm      EW1        ? Equivalent width, 1992 May 22
  39- 43  F5.2   ---     log(Eps1)      ? Abundance at lambda, 1992 May 22
  46- 48  I3     10-4nm      EW2        ? Equivalent width, 1994 June 24
  50- 54  F5.2   ---     log(Eps2)      ? Abundance at lambda, 1994 June 24
  57- 59  I3     10-4nm      EW3        ? Equivalent width, 1994 July 29
  61- 65  F5.2   ---     log(Eps3)      ? Abundance at lambda, 1994 July 29
  68- 70  I3     10-4nm      EW4        ? Equivalent width, 1995 June 12
  72- 76  F5.2   ---     log(Eps4)      ? Abundance at lambda, 1995 June 12
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Origin: AAS CD-ROM series, Volume 8, 1997        Lee E. Brotzman [ADS] 06-May-97
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(End)                                                         [CDS]  04-Jul-1997