Spectropolarimetric Clues to the Structure and Evolutionary Status of MWC 349A | Zendy

Jillian Bellovary | Zendy; K. H. Nordsieck | Zendy; Jennifer L. Hoffman | Zendy

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Spectropolarimetric Clues to the Structure and Evolutionary Status of MWC 349A

Author(s) -

Jillian Bellovary,

K. H. Nordsieck,

Jennifer L. Hoffman

Publication year - 2002

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/339186

Subject(s) - physics , position angle , observatory , astrophysics , polarization (electrochemistry) , astronomy , telescope , circular polarization , bipolar outflow , wavelength , interstellar medium , stars , optics , star formation , galaxy , chemistry , microstrip

We present visible-wavelength spectropolarimetric measurements of theemission-line star MWC 349A and its close optical companion MWC 349B, conductedwith the HPOL spectropolarimeter on both the 0.9 m telescope at the Universityof Wisconsin's Pine Bluff Observatory and the 3.5 m WIYN telescope on KittPeak. Our measurements allow us to estimate the interstellar polarizationcontribution and thus constrain the intrinsic polarization of MWC 349A, whichwe find to be consistent in position angle with the dusty disk seenperpendicular to the bipolar outflow. Our analysis reopens the possibility thatMWC 349A may be part of the Cyg OB2 association, suggests that it is not aphysical companion to MWC 349B, and supports the classification of MWC 349A asa pre-main sequence B[e] star.Comment: 16 pages, 7 figures, accepted for publication in A

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