The diffuse clouds towards Cyg OB2 No. 5 and No. 12

Authors: Casu, Silvia; Scappini, Flavio¹; Cecchi-Pestellini, Cesare²; Olberg, Michael³

Source: Monthly Notices of the Royal Astronomical Society, Volume 359, Number 1, May 2005 , pp. 73-78(6)

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Abstract:

We have investigated, in the ¹³CO(1–0) line, the region between the stars Cyg OB2 No. 5 and No. 12. The integrated intensity contour map reveals the existence of a condensation at 12 km s⁻¹ (core C), north-west of Cyg OB2 No. 5, with a core–halo structure. The morphology and the derived physical parameters make it quite similar to core A, previously discovered towards Cyg OB2 No. 12. A second condensation at 7 km s⁻¹, near Cyg OB2 No. 12, has been mapped in the same line (1–0) of ¹³CO. A summary of different observations, in all spectral regions, towards Cyg OB2 No. 5 and No. 12 is presented to provide the material for a further comprehensive discussion of this intricate and still intriguing region.

Keywords: stars: individual: Cyg OB2 No. 5; stars: individual: Cyg OB2 No. 12; ISM: clouds; ISM: molecules; submillimetre

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1365-2966.2005.08873.x

Affiliations: 1: Istituto per lo Studio dei Materiali Nanostrutturati del CNR, Via P. Gobetti 101, 40129 Bologna, Italy 2: Università di Lecce, Dipartimento di Fisica, Via di Arnesano, 73100 Lecce, Italy 3: Onsala Space Observatory, 43900 Onsala, Sweden

Publication date: 2005-05-01