# A Reassessment of the Kinematics of PV Cephei Based on Accurate Proper Motion Measurements

 Title: A Reassessment of the Kinematics of PV Cephei Based on Accurate Proper Motion Measurements Author: Loinard, Laurent; Rodríguez, Luis F.; Gómez, Laura; Cantó, Jorge; Raga, Alejandro C.; Goodman, Alyssa A.; Arce, Héctor G. Note: Order does not necessarily reflect citation order of authors. Citation: Loinard, Laurent, Luis F. Rodríguez, Laura Gómez, Jorge Cantó, Alejandro C. Raga, Alyssa A. Goodman, and Héctor G. Arce. 2010. A reassessment of the kinematics of PV Cephei based on accurate proper motion measurements. Revista Mexicana de Astronomía y Astrofísica 46: 375-383. Full Text & Related Files: 59913959.pdf (324.8Kb; PDF) Abstract: We present two Very Large Array observations of the pre-main-sequence star PV Cephei, taken with a separation of 10.5 years. These data show that the proper motions of this star are $$\mu_{\alpha} = +10.9 \pm 3.0 \ mas \ yr^{-1}$$; $$\mu_{\delta} +0.2 \pm 1.8 \ mas \ yr^{-1}$$, very similar to those – previously known – of HD 200775, the B2Ve star that dominates the illumination of the nearby reflection nebula NGC 7023. This result suggests that PV Cephei is not a rapidly moving run-away star as suggested by previous studies. The large velocity of PV Cephei had been inferred from the systematic eastward displacement of the bisectors of successive pairs of Herbig Haro knots along its flow. These systematic shifts might instead result from an intrinsic dissymmetry in the ejection mechanisms, or from an asymmetric distribution of the circumstellar material. Other Sources: http://arxiv.org/abs/1008.0379v1 Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:5126068

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Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University