Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...336l..17v&link_type=abstract
Astronomy and Astrophysics, v.336, p.L17-L20 (1998)
Astronomy and Astrophysics
Astrophysics
55
Stars: Binaries: Close, Stars: Evolution, Stars: Individual: Ac Her, Hd 44179, Stars: Agb And Post-Agb
Scientific paper
We present in this letter a homogeneous set of CORAVEL radial velocity measurements of the well studied RV Tauri star AC Her showing it to be a binary with a period of 1196 +/- 6 days. The photospheric abundances are deduced using high resolution, high signal-to-noise optical spectra and prove that AC Her is another RV Tauri star displaying depletion of refractory elements, strengthening the relation between binarity and the depletion process. Our full ISO-SWS spectrum shows that the unusual broad emission feature at 8-12 mu m, is due to a high crystallisation fraction of the circumstellar silicates. We review all observational evidence that the circumstellar material is trapped in a long-lived disc in the system similar to what is observed in the Red Rectangle nebula. based on observations collected at the European Southern Observatory in Chile, at La Palma Spain, and with the Swiss telescope at OHP, France
Bakker Eric J.
Molster Frank J.
Udry Stephane
van Winckel Hans
Waelkens Christoffel
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