Analysis of the hydrogen deficient helium star HD 168476
Employing high dispersion spectrographic material, a chemical and physical analysis of the atmosphere of the extreme helium star HD 168476 is made. Log gf values from the National Bureau of Standards compilation were preferentially used. For the singly ionized elements of the iron group, Warner'...
| Autores principales: | , , |
|---|---|
| Formato: | Articulo Comunicacion |
| Lenguaje: | Español |
| Publicado: |
1987
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/137259 |
| Aporte de: |
| id |
I19-R120-10915-137259 |
|---|---|
| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Español |
| topic |
Astronomía Galaxias helium star HD |
| spellingShingle |
Astronomía Galaxias helium star HD Bobatto, G.E. Milone, L.A. Villada de Arnedo, M.M. Analysis of the hydrogen deficient helium star HD 168476 |
| topic_facet |
Astronomía Galaxias helium star HD |
| description |
Employing high dispersion spectrographic material, a chemical and physical analysis of the atmosphere of the extreme helium star HD 168476 is made. Log gf values from the National Bureau of Standards compilation were preferentially used. For the singly ionized elements of the iron group, Warner's values corrected as suggested by Milone-Milone were used. It was almost impossible to derive neither an excitation temperature nor a ionization one, as quite different values result depending on the element. The value T=12300 K was finally adopted. The turbulent velocity (its most probably value) is also poorly determined: 0 ≤ Vₜ ≤ 20 km/sec; the mean weighted value (as derived from several elements) is Vₜ=5 km/sec. The uncertainty in Vₜ affects abundances as much as 0.6 dex. The abundances we have found are in good agreement with the values reported in Hill's classical paper. This paper will be published in full elsewhere. |
| format |
Articulo Comunicacion |
| author |
Bobatto, G.E. Milone, L.A. Villada de Arnedo, M.M. |
| author_facet |
Bobatto, G.E. Milone, L.A. Villada de Arnedo, M.M. |
| author_sort |
Bobatto, G.E. |
| title |
Analysis of the hydrogen deficient helium star HD 168476 |
| title_short |
Analysis of the hydrogen deficient helium star HD 168476 |
| title_full |
Analysis of the hydrogen deficient helium star HD 168476 |
| title_fullStr |
Analysis of the hydrogen deficient helium star HD 168476 |
| title_full_unstemmed |
Analysis of the hydrogen deficient helium star HD 168476 |
| title_sort |
analysis of the hydrogen deficient helium star hd 168476 |
| publishDate |
1987 |
| url |
http://sedici.unlp.edu.ar/handle/10915/137259 |
| work_keys_str_mv |
AT bobattoge analysisofthehydrogendeficientheliumstarhd168476 AT milonela analysisofthehydrogendeficientheliumstarhd168476 AT villadadearnedomm analysisofthehydrogendeficientheliumstarhd168476 |
| bdutipo_str |
Repositorios |
| _version_ |
1764820456718729217 |