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Herschel PACS and SPIRE imaging of CW Leonis
Ladjal, D.; Barlow, M.J.; Groenewegen, M.A.T.; Ueta, T.; Blommaert, J.A.D.L.; Cohen, M.; Decin, L.; De Meester, W.; Exter, K.; Gear, W.K.; Gomez, H.L.; Hargrave, P.C.; Huygen, R.; Ivison, R.J.; Jean, C.; Kerschbaum, F.; Leeks, S.J.; Lim, T.L.; Olofsson, G.; Polehampton, E.; Posch, T.; Regibo, S.; Royer, P.; Sibthorpe, B.; Swinyard, B.M.; Vandenbussche, B.; Waelkens, C.; Wesson, R. (2010). Herschel PACS and SPIRE imaging of CW Leonis. Astron. Astrophys. 518: L141. https://dx.doi.org/10.1051/0004-6361/201014658
In: Astronomy & Astrophysics (Les Ulis). EDP Sciences: Les Ulis. ISSN 0004-6361; e-ISSN 1432-0746, more
Peer reviewed article  
Available in  Authors 
Author keywords
    circumstellar matter / stars: AGB and post-AGB / stars: carbon / stars: mass-loss / stars: individual: CW Leo
Authors  Top 
  • Ladjal, D.
  • Barlow, M.J.
  • Groenewegen, M.A.T.
  • Ueta, T.
  • Blommaert, J.A.D.L.
  • Cohen, M.
  • Decin, L.
  • De Meester, W.
  • Exter, K., more
  • Gear, W.K.
  • Gomez, H.L.
  • Hargrave, P.C.
  • Huygen, R.
  • Ivison, R.J.
  • Jean, C.
  • Kerschbaum, F.
  • Leeks, S.J.
  • Lim, T.L.
  • Olofsson, G.
  • Polehampton, E.
  • Posch, T.
  • Regibo, S.
  • Royer, P.
  • Sibthorpe, B.
  • Swinyard, B.M.
  • Vandenbussche, B.
  • Waelkens, C.
  • Wesson, R.
Abstract
    Herschel PACS and SPIRE images have been obtained over a 30' × 30' area around the well-known carbon star CW Leo (IRC +10 216). An extended structure is found in an incomplete arc of ~22' diameter, which is cospatial with the termination shock due to interaction with the interstellar medium (ISM) as defined by Sahai & Chronopoulos from ultraviolet GALEX images. Fluxes are derived in the 70, 160, 250, 350, and 550 μm bands in the region where the interaction with the ISM takes place, and this can be fitted with a modified black body with a temperature of 25 ± 3 K. Using the published proper motion and radial velocity for the star, we derive a heliocentric space motion of 25.1 km s-1. Using the PACS and SPIRE data and the analytical formula of the bow shock structure, we infer a de-projected standoff distance of the bow shock of R0 = (8.0 ± 0.3) × 1017 cm.We also derive a relative velocity of the star with respect to the ISM of (106.6 ± 8.7)/?km s-1, where nISM is the number density of the local ISM.
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