| dc.creator | Romero, Gisela Andrea | |
| dc.creator | Cappa, Cristina Elisabet | |
| dc.date | 2008-07 | |
| dc.date | 2019-11-04T13:59:38Z | |
| dc.identifier | http://sedici.unlp.edu.ar/handle/10915/84774 | |
| dc.identifier | issn:0035-8711 | |
| dc.description | We investigate the distribution of the interstellar matter in the environs of the H II region Sh2-205, based on neutral hydrogen 21-cm-line data and radio continuum images at 408 and 1420 MHz obtained from the CGPS, 12CO (J=1 →0) observations, high-resolution IRAS data (HIRES), and MSX data. Sh2-205 can be separated into three distinct optical structures: SH 149.25-0.0, SH 148.83-0.67, and LBN 148.11-0.45. The three regions are detected at both 408 and 1420 MHz. The derived spectral indices show the thermal nature of SH 148.83-0.67 and LBN 148.11-0.45. LBN 148.11-0.45 is a classical H II region surrounded by an H i shell. The associated neutral atomic and ionized masses are 65 M⊙ and 70 M⊙, respectively. Dust and molecular gas (∼6 × 104 M⊙) related to this ionized region have been found. In particular, a photodissociation region is detected at the interface between the ionized and molecular regions. If the proposed exciting star HD 24094 were an O8-O9 type star, as suggested by its near-infrared colours, its UV photon flux would be strong enough to explain the ionization of the nebula. The optical, radio continuum, and 21-cm-line data allow us to conclude that SH 148.83-0.67 is an interstellar bubble powered by the energetic action of HD 24431. The associated neutral atomic and ionized masses are 180 M⊙ and 300 M⊙, respectively. The emission of SH 149.25-0.0 is too faint to derive the dust and gas parameters. An H I shell centred at (l, b) = (149°0', -1°30') was also identified. It correlates morphologically with the molecular gas emission. The neutral atomic and molecular masses of the shell are 1600 M⊙ and 2.6 × 104 M⊙, respectively. The open cluster NGC 1444 is probably responsible for shaping this H I structure. | |
| dc.description | Facultad de Ciencias Astronómicas y Geofísicas | |
| dc.description | Instituto Argentino de Radioastronomía | |
| dc.format | application/pdf | |
| dc.format | 1080-1092 | |
| dc.language | en | |
| dc.rights | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
| dc.rights | Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) | |
| dc.subject | Ciencias Astronómicas | |
| dc.subject | ISM: bubbles - ISM: structure | |
| dc.subject | Stars: individual: ALS 7793 | |
| dc.subject | Stars: individual: HD 24094 | |
| dc.subject | Stars: individual: HD 24431 | |
| dc.title | Sh2-205 - I: the surrounding interstellar medium | |
| dc.type | Articulo | |
| dc.type | Articulo | |
