J. P. Wisniewski et al 2003 ApJ 598 L43 doi:10.1086/380500
Evolution of the Inner Circumstellar Envelope of V838 Monocerotis
FREEJ. P. Wisniewski1, K. S. Bjorkman1 and A. M. Magalhães2
Show affiliationsWe present imaging polarimetry observations of the eruptive variable V838 Monocerotis and its neighboring field obtained in 2002 October. The polarization of field stars confirms the previously determined interstellar polarization along the line of sight to V838 Mon. While V838 Mon showed intrinsic polarization shortly after its second outburst on 2002 February 8, all subsequent observations only showed a quiescent interstellar polarization component. We find that V838 Mon once again showed significant intrinsic polarization in 2002 October, suggesting the presence of an asymmetrical geometry of scattering material close to the star. Furthermore, an observed 90° position angle flip in the intrinsic polarization from 2002 February to October suggests that the distribution of nearby circumstellar material has experienced significant changes. We discuss the opacity changes in the evolving circumstellar cloud around V838 Mon that may explain these observations.
- Subject headings
circumstellar matter; stars: individual (V838 Monocerotis); techniques: polarimetric
- Dates
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Issue 1 (2003 November 20)
Received 2003 September 11, accepted for publication 2003 October 8
Published 2003 October 31
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Evolution of the Inner Circumstellar Envelope of V838 Monocerotis
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