Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.235l&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
We have started a multi-wavelength survey of a couple of low-mass Young Stellar Objects (YSOs) in the star forming region R Coronae Australis situated close to the Herbig Ae star R Coronae Australis. The presence of a massive star gives us a nice opportunity to study the effects from nearby stars on the chemistry around low-mass YSOs. We have studied the excited molecular gas in the region in both millimetre (H_2CO, CH_3OH, c-C_3H_2, DCN, SiO, etc.) using SMA and APEX; and far-infrared (CO, OH, H_2O) using Herschel Space Observatory. In millimetre, the molecular emission does not show a normal outflow pattern, but rather a clumpy ridge pointing towards the Herbig Ae star. This might imply that the molecular gas around the YSOs is directly affected by the proximity to this star. The Herschel data show very strong OH emission compared to similar star forming regions, which could indicate that the excitation of the gas is affected by the presence of the Herbig Ae star. Relatively strong and extended CO emission is also detected. Comparing the Herschel and the SMA/APEX data allows examination of two different temperature regimes of the molecular gas. The forest of CO rotation lines seen in the Herschel data show two warm temperature components for both YSOs (T˜ 350-800 K). The SMA/APEX data instead traces much colder gas, on the order of 20-60 K. We clearly see that the CO 21-20 (2414 GHz) and H_2CO 303-202 (218 GHz) emission make out two different parts of the surroundings of the YSOs.
Herschel DIGIT Team
Jorgensen Jes K.
Lindberg Johan E.
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