Herschel PACS and SPIRE imaging of CW Leo
- Author(s)
- Djazia Ladjal, Michael J. Barlow, Martin A. T. Groenewegen, Toshiya Ueta, Joris A D L Blommaert, Thomas Posch
- Abstract
Herschel PACS and SPIRE images have been obtained over a 30'x30' 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 um 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. 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)x1017 cm. We also derive a relative velocity of the star with respect to the ISM of (106.6±8.7)/√nISM km/s, where nISM is the number density of the local ISM.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Katholieke Universiteit Leuven, University College London, Université de Provence Aix-Marseille I, Royal Observatory of Belgium, University of Denver
- Journal
- Astronomy & Astrophysics
- Volume
- 518
- ISSN
- 0004-6361
- Publication date
- 2010
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy, 103004 Astrophysics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/8e5b44c8-670c-432c-97fe-14d8f46f1d94