Star formation in the S233 region
| Autor: | Ladeyschikov, D. A., Sobolev, A. M., Parfenov, S. Yu., Alexeeva, S. A., Bieging, J. H. |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Mon. Not. R. Astron. Soc., 2015, Vol. 452, Issue 3, P. 2306-2317 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stv1422 |
| Popis: | The main objective of this paper is to study the possibility of triggered star formation on the border of the HII region S233, which is formed by a B-star. Using high-resolution spectra we determine the spectral class of the ionizing star as B0.5 V and the radial velocity of the star to be -17.5(1.4) km/s. This value is consistent with the velocity of gas in a wide field across the S233 region, suggesting that the ionizing star was formed from a parent cloud belonging to the S233 region. By studying spatial-kinematic structure of the molecular cloud in the S233 region, we detected an isolated clump of gas producing CO emission red-shifted relative to the parent cloud. In the UKIDSS and WISE images, the clump of gas coincides with the infrared source containing a compact object and bright-rimmed structure. The bright-rimmed structure is perpendicular to the direction of the ionizing star. The compact source coincides in position with IRAS source 05351+3549. All these features indicate a possibility of triggering formation of a next-generation star in the S233 region. Within the framework of a theoretical one-dimensional model we conclude that the "collect-and-collapse" process is not likely to take place in the S233 region. The presence of the bright-rimmed structure and the compact infrared source suggest that the "collapse of the pre-existing clump" process is taking place. Comment: 12 pages, 10 figures |
| Databáze: | arXiv |
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