Two planetary nebulae near the galactic center
Observations of two emission objects located in the direction of the galactic center have been made: They are: M3-44 = PK 359-1°2, M2-19 = PK 0-1°5. They are both objects of very low excitation, classified previously as PN?, and with few or no published observations of optical line intensities. Both...
Guardado en:
| Autores principales: | , , |
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| Formato: | Articulo Comunicacion |
| Lenguaje: | Español |
| Publicado: |
1990
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/142880 |
| Aporte de: |
| id |
I19-R120-10915-142880 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Español |
| topic |
Astronomía Galaxia |
| spellingShingle |
Astronomía Galaxia Gutiérrez Moreno, A. Moreno, H. Cortés, G. Two planetary nebulae near the galactic center |
| topic_facet |
Astronomía Galaxia |
| description |
Observations of two emission objects located in the direction of the galactic center have been made: They are: M3-44 = PK 359-1°2, M2-19 = PK 0-1°5. They are both objects of very low excitation, classified previously as PN?, and with few or no published observations of optical line intensities. Both are included in the IRAS Point Source Catalogue. The spectra were obtained at Cerro Tololo Inter-American Observatory, using the 1.5 m telescope equipped with a UV SIT Vidicon detector, and with additional spectra obtained for M3-44 using the 4 m telescope equipped with a CCD detector. From the analysis of these observations the following conclusions have been reached: a)M3-44 is a very low excitation object (excitation class 0, hydrogen Zanstra temperature of the nebula ≃ 8000K), with a mean square electron density ≃ 3000, and with S II condensation of very high density; and with S Ii condensation of very high density; and b) M2-19 has somewhat higher excitation (excitation class 2, hydrogen Zanstra temperature of the central star ≃ 26000-30000 K, electron temperature ≃ 8500-9000 K), and electron density of the order of 1000. From the IRAS Catalogue observations we may deduce that both objects are rich in dust, with two components of different black body temperature: a "hot" component with T ≃ 100K and a cold component with T ≃ 20K, being the mass of the hot component about 1/1000 of the cold component. From all these considerations, we believe that M2-19 has all the characteristics of a low excitation planetary nebula, while the characteristics of M3-44 would allow its classification as a compact H II region. |
| format |
Articulo Comunicacion |
| author |
Gutiérrez Moreno, A. Moreno, H. Cortés, G. |
| author_facet |
Gutiérrez Moreno, A. Moreno, H. Cortés, G. |
| author_sort |
Gutiérrez Moreno, A. |
| title |
Two planetary nebulae near the galactic center |
| title_short |
Two planetary nebulae near the galactic center |
| title_full |
Two planetary nebulae near the galactic center |
| title_fullStr |
Two planetary nebulae near the galactic center |
| title_full_unstemmed |
Two planetary nebulae near the galactic center |
| title_sort |
two planetary nebulae near the galactic center |
| publishDate |
1990 |
| url |
http://sedici.unlp.edu.ar/handle/10915/142880 |
| work_keys_str_mv |
AT gutierrezmorenoa twoplanetarynebulaenearthegalacticcenter AT morenoh twoplanetarynebulaenearthegalacticcenter AT cortesg twoplanetarynebulaenearthegalacticcenter |
| bdutipo_str |
Repositorios |
| _version_ |
1764820459056005122 |