Ref: ASTROimport-446

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.

published in Astronomy and Astrophysics, 518, pp. L141 (2010)

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)/v{n_ISM} km s-1, where nISM is the number density of the local ISM. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

DOI: 10.1051/0004-6361/201014658
Links: link

The record appears in these collections:
Royal Observatory of Belgium > Astronomy & Astrophysics
Science Articles > Peer Reviewed Articles

 Record created 2016-07-01, last modified 2016-07-06