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HIFI spectrum of OH 231.8+4.2 where high-excitation, low velocity components are observed revealing the presence of a new warm emission component at 150 K, which is needed to explain the whole set of molecular lines observed with Herschel (Santander-García et al. this proceedings).  

HIFI spectrum of OH 231.8+4.2 where high-excitation, low velocity components are observed revealing the presence of a new warm emission component at 150 K, which is needed to explain the whole set of molecular lines observed with Herschel (Santander-García et al. this proceedings).  

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Figure 1. PACS/SPIRE three colour composite image (blue=70 µm,...
Figure 2. Combined PACS 160 µm and SPIRE 250 and 350 µm image of CW Leo...
Figure 4. HIFI spectrum of OH 231.8+4.2 where high-excitation, low...
Figure 5. A Herschel 250 µm and Spitzer/IRAC 8 and Spitzer/MIPS 24 µm...
Figure 3. PACS spectrum of the red supergiant VY CMa between 57 and 210...
Early Herschel results on evolved stars and planetary nebulae
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  • Aug 2012
Herschel, an ESA space observatory equipped with science instruments provided by European-led Principal Investigator consortia with important participation from NASA, was launched on 14 May 2009. With its 3.5m diameter primary mirror, Herschel is the largest space telescope ever launched into space, and carries onboard three science instruments, wh...
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... at 100 km s −1 must have a temperature higher than ∼200 K. Probably, this very fast outflow, with a kinematic age <100 yr, has been accelerated by a shock and has not yet cooled down. In contrast, the fast winds in OH 231.8+4.2 and NGC 6302 are cold, with T ∼ 30 K (a warmer component has recently been found in OH 231.8+4.2 at low velocity -see Fig. 4). Other nebulae, like CRL 2688, show intermediate temperatures, with characteristic values around 100 K. Two-component models are sometimes needed to explain the complex structure of the nebulae observed. The differences in temperature in the different nebulae can be due to cooling after the gas acceleration (that is probably due to ...