Evolution of the Inner Circumstellar Envelope of V838 Monocerotis

Abstract

We 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 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 degree position angle flip in the intrinsic polarization from 2002 February to 2002 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.

arXiv commentaccepted by ApJL, 11 pages (including 2 figs, 2 tables)

References in corpus (8)

• An energetic stellar outburst accompanied by circumstellar light echoes
• The mysterious eruption of V838 Mon
• A multi-epoch spectrophotometric atlas of symbiotic stars
• The peculiar variable V838 Mon
• The post-outburst photometric behaviour of V838 Mon
• Near infra-red spectroscopy of V838 Monocerotis
• Spectroscopic and Spectropolarimetric Observations of V838 Mon
• S 111 and the polarization of the B[e] supergiants in the Magellanic Clouds

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