|
|||||
|
|
Sh2-205 – II. Quiescent star-formation activity |
|
| Authors: | G A Romero † C E Cappa ‡ |
| Institution: | Departamento de Física y Astronomía, Universidad de Valparaíso, Avenida Gran Bretaña 1111, Valparaíso, Chile;Instituto Argentino de Radioastronomía, CCT-La Plata, CONICET, CC 5, 1894 Villa Elisa, Argentina;Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina |
| Abstract: | We present a study of active star-forming regions in the environs of the H ii region Sh2-205. The analysis is based on data obtained from point source catalogues and images extracted from the Two-Micron All-Sky Survey (2MASS), Midcourse Space Experiment ( MSX ) and IRAS surveys. Complementary data are taken from a CO survey. The identification of primary candidates for star-formation activity is made following colour criteria and a correlation with molecular gas emission. A number of star-formation tracer candidates are projected on to two substructures of the H ii region: SH 148.83–0.67 and SH 149.25–0.00. However, the lack of molecular gas related to these structures casts doubt on the nature of the sources. Additional infrared sources may be associated with the H i shell centred at ( l , b ) = (149°0', ?1°30') . The most striking active area was found in connection with the H ii region LBN 148.11–0.45, where star-formation candidates are projected on to molecular gas. The analytical model of the 'collect and collapse' process shows that star-formation activity could have been triggered by the expansion of this H ii region. |
| Keywords: | stars: formation H ii regions ISM: structure infrared: ISM infrared: stars |