Suspected symbiotic stars
During 1987 we were engaged in a program of observation of planetary nebulae and symbiotic stars. The program included a group of five objects classified as suspected symbiotic stars: CD-3608436, Sa3-43, 1 Th4-4, V3804 Sgr and He2-104. All of then have been observed three times. They all appear in A...
Guardado en:
| Autores principales: | , |
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| Formato: | Articulo Comunicacion |
| Lenguaje: | Español |
| Publicado: |
1988
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/142261 |
| Aporte de: |
| Sumario: | During 1987 we were engaged in a program of observation of planetary nebulae and symbiotic stars. The program included a group of five objects classified as suspected symbiotic stars: CD-3608436, Sa3-43, 1 Th4-4, V3804 Sgr and He2-104. All of then have been observed three times. They all appear in Allen's Catalogue of symbiotic stars as suspected symbiotic. They all share two characteristics which are typical of symbiotic objects: the Balmer decrement is very steep, and the relative intensity of the [0 III] lines, I(λ4363)/I(λ5007), is larger than could be expected for planetary nebulae. Four of them do not show the typical lines at λ6830 and λ7088. The spectra of these objects are presented and their characteristics are discussed; we also discuss their position in the diagnostic diagrams based on the intensities of the forbidden lines [0 III] λλ 4363 and 5007, presented by one of us (Gutiérrez-Moreno) at the Anniversary Symposium of Cerro Tololo. It is concluded that, according to these diagrams and the general spectral characteristics, all these objets are symbiotic stars; this fact is evident from the spectrum itself for CD-36°8436 and, to a lesser extent, for SA3-43, Th4-4 and V3894 Sgr. He2-104 presents a special case, since the characteristic of its continuum correspond exactly to those of a planetary nebula. Nevertheless, its position in the diagrams previously mentioned and the presence of some forbidden emission lines, typical of symbiotic stars, allow its classification in this last group. |
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