par Jorissen, Alain 
;Van Eck, Sophie ;Dermine, Tijl ;Van Winckel, Hans;Gorlova, Nadya
Référence Baltic astronomy, 21, 1-2, page (37-44)
Publication Publié, 2012-01-17
;Van Eck, Sophie ;Dermine, Tijl ;Van Winckel, Hans;Gorlova, NadyaRéférence Baltic astronomy, 21, 1-2, page (37-44)
Publication Publié, 2012-01-17
Article révisé par les pairs
| Résumé : | We present new orbital elements for two symbiotic systems involving a giant of spectral type S, namely V420 Hya and ER Del. These orbital elements are compared with existing elements for S-type binaries and for symbiotic binaries with M-giant primaries. It is shown that among the S-type binaries, most of the short-period systems (with P in the range 300 - 1000 d) exhibit some kind of symbiotic activity (Hα emission, UV continuum, hard X-rays), but symbiotic systems are not restricted to the short-period systems. The complex and varying Ha profile of V420 Hya has been decomposed to several components (broad emission with σ ∼ 140 km/s, narrow emission with σ ∼ 60 km/s, and narrow absorption components). Their orbital modulation reveals that the broad emission is located close to the companion (under the hypothesis of a system with a mass ratio M g/M c = 2), and that this broad emission is mutilated by absorption from matter located along the line of sight and flowing towards the observer (faster than the giant) at all orbital phases. |
