Star formation in the southern dark cloud DC 287.1+02.4
Centro de Astronomia e Astrofísica da Universidade de Lisboa, Observatório Astronómico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal e-mail: [yun;Pedro.Figueira]@oal.ul.pt
Accepted: 23 February 2006
Aims.We report the discovery of a group of 12 new infrared sources seen toward IRAS 10501-5630 and the southern dark globule DC 287.1+02.4. The globule appears as a round patch of extinction in optical images with a typical diameter of 5 arcmin.
Methods.The sources are seen on Ks and L' band images taken using SOFI at the NTT and ISAAC at the VLT. The globule was mapped in millimeter molecular transitions (CO(1–0), C18O(1–0), C18O(2–1), CS(2–1), HCN(1–0)) using the SEST telescope.
Results.Millimeter-wave spectroscopy revealed a single dense core seen in C18O, CS, and HCN, extending about 2 arcmin. The infrared sources are likely to be embedded in the dense cloud core. The reddest of the new infrared sources, named here DC 287.1+02.4 IRS, is not detected shortward of 2 μm, and it exhibits a very red colour. The location and colour of this source suggest that this is the near-infrared counterpart of IRAS 10501-5630. Red nebular emission with an elongated shape is also seen in the H and band images and could be due to scattered light originating in the embedded objects.
Key words: stars: formation / ISM: clouds / ISM: individual: objects: DC 287.1+02.4 / infrared: ISM / radio lines: ISM / ISM: dust, extinction
© ESO, 2006