| Issue |
A&A
Volume 386, Number 2, May I 2002
|
|
|---|---|---|
| Page(s) | 504 - 516 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20020209 | |
| Published online | 15 May 2002 | |
RU Cen and SX Cen: Two strongly depleted RV Tauri stars in binary systems*
The RV Tauri photometric b phenomenon and binarity
Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium
Corresponding author: T. Maas, Thomas.Maas@ster.kuleuven.ac.be
Received:
11
September
2001
Accepted:
6
February
2002
We present a chemical abundance analysis on the basis of high signal-to-noise and high-resolution
(
) optical spectra of
two RV Tauri stars RU Cen and SX Cen.
With an ![$\rm [Fe/H] = -1.9$](/articles/aa/abs/2002/17/aah3142/aah3142_tex_eq2.png)
and a ![$\rm [Zn/Fe] = +0.9$](/articles/aa/abs/2002/17/aah3142/aah3142_tex_eq3.png)
for RU Cen and a ![$\rm [Fe/H] = -1.1$](/articles/aa/abs/2002/17/aah3142/aah3142_tex_eq4.png)
and a ![$\rm [Zn/Fe] = +0.6$](/articles/aa/abs/2002/17/aah3142/aah3142_tex_eq5.png)
for SX Cen, both stars of spectroscopic class B display strong depletion of
refractory elements in their photospheres.
Our CORALIE radial velocity measurements prove the stars to be members of binary systems and a
detailed construction of the spectral energy
distribution indicate the presence of a large amount of hot circumstellar dust.
Moreover, the orbital period of SX Cen of around 600 days is similar to the published period of
mean magnitude variation in the light curve (RV Tauri phomometric class b phenomenon).
All these observations indicate the presence of a stable circumbinary disk in the objects
and strengthen the model that this is a necessary condition for the depletion process to take place.
Key words: stars: abundances / stars: AGB and post-AGB / stars: evolution / stars: individual: RU Cen / stars: individual: SX Cen / stars: individual: RV Tauri
© ESO, 2002
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