The Circumstellar Environments of NML Cyg and the Cool Hypergiants

Details The Circumstellar Environments of NML Cyg and the Cool Hypergiants The Circumstellar Environments of NML Cyg and the Cool Hypergiants

2005-09-30

arxiv.org/abs/astro-ph/0510010v1

Astron.J.131:603-611,2006

Astronomy and Astrophysics

Astrophysics

28 pages, 8 figures, accepted for publication in The Astronomical Journal

Scientific paper

10.1086/498395

We present high-resolution HST WFPC2 images of compact nebulosity surrounding the cool M-type hypergiants NML Cyg, VX Sgr and S Per. The powerful OH/IR source NML Cyg exhibits a peculiar bean-shaped asymmetric nebula that is coincident with the distribution of its H2O vapor masers. We show that NML Cyg's circumstellar envelope is likely shaped by photo-dissociation from the powerful, nearby association Cyg OB2 inside the Cygnus X superbubble. The OH/IR sources VX Sgr and S Per have marginally resolved envelopes. S Per's circumstellar nebula appears elongated in a NE/SW orientation similar to that for its OH and H2O masers, while VX Sgr is embedded in a spheroidal envelope. We find no evidence for circumstellar nebulosity around the intermediate-type hypergiants rho Cas, HR 8752, HR 5171a, nor the normal M-type supergiant mu Cep. We conclude that there is no evidence for high mass loss events prior to 500-1000 yrs ago for these four stars.

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