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AKARI/FIS mapping of the ISM-Wind bow shock around α Orionis

Ueta, Toshiya, Izumiura, Hideyuki, Yamamura, Issei, Nakada, Yoshikazu, Matsuura, Mikako ORCID:, Ita, Yoshifusa, TanabÉ, Toshihiko, Fukushi, Hinako, Matsunaga, Noriyuki and Mito, Hiroyuki 2008. AKARI/FIS mapping of the ISM-Wind bow shock around α Orionis. Publications of Astronomical Society of Japan 60 (sp2) , S407–S413. 10.1093/pasj/60.sp2.S407

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We present 10 × 50'scan maps around an M supergiant αOri at 65, 90, 140, and 160μm obtained with the AKARI Infrared Astronomy Satellite. Higher spatial resolution data with the exact analytic solution permit us to fit the de-projected shape of the stellar-wind bow shock around αOri to have a stand-off distance of 4'.8, position angle of 55° and inclination angle of 56°. The shape of the bow shock suggests that the velocity of αOri with respect to the local medium is v*= 40 nH-1/2, where nH is the hydrogen nucleus density at αOri. We found that the local medium is of nH = 1.5 to 1.9 cm-³ and the velocity of the local flow is at 11kms-¹ by using the most recent astrometric solutions for αOri under the assumption that the medium local to αOri is moving away from the Orion OB 1 association. AKARI images may also reveal avortex ring due to instabilities on the surface of the bow shock, as demonstrated by numerical models. This research exemplifies the potential of AKARI All-Sky data as well as follow-up observations with Herschel Space Telescope and Stratospheric Observatory for Infrared Astronomy for this avenue of research in revealing the nature of the interaction between the stellar wind and the interstellar medium....

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0004-6264
Date of Acceptance: 16 August 2008
Last Modified: 10 May 2024 13:45

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