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Herschel PACS and SPIRE imaging of CW Leonis
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2010 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 518, L141- p.Article in journal (Refereed) Published
Abstract [en]

Herschel PACS and SPIRE images have been obtained over a 30' x 30' area around the well-known carbon star CW Leo (IRC + 10 216). An extended structure is found in an incomplete arc of similar to 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 mu m 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 R-0 = (8.0 +/- 0.3) x 10(17) cm. We also derive a relative velocity of the star with respect to the ISM of (106.6 +/- 8.7)/ root n(ISM) km s (1), where n(ISM) is the number density of the local ISM.

Place, publisher, year, edition, pages
2010. Vol. 518, L141- p.
Keyword [en]
circumstellar matter, stars: AGB and post-AGB, stars: carbon, stars: mass-loss, stars: individual: CW Leo
National Category
Natural Sciences
URN: urn:nbn:se:su:diva-51696DOI: 10.1051/0004-6361/201014658ISI: 000281527200142OAI: diva2:385724
authorCount :28Available from: 2011-01-12 Created: 2011-01-12 Last updated: 2011-01-12Bibliographically approved

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Olofsson, Göran
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Department of Astronomy
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