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Herschel PACS and SPIRE imaging of CW Leonis [Letter]

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, Walter Kieran, Gomez, Haley Louise, Hargrave, Peter Charles, 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. and Wesson, R. 2010. Herschel PACS and SPIRE imaging of CW Leonis [Letter]. Astronomy and Astrophysics 518 , L141. 10.1051/0004-6361/201014658

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: circumstellar matter ; stars: AGB and post-AGB ; stars: carbon ; stars: mass-loss ; stars: individual: CW Leo
Additional Information: Letter to the editor. Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0004-6361/ (accessed 17/04/2014)
Publisher: EDP Sciences
ISSN: 0004-6361
Date of First Compliant Deposit: 30 March 2016
Last Modified: 04 Jun 2017 03:36
URI: http://orca-mwe.cf.ac.uk/id/eprint/23536

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