The Circumstellar Environments of NML Cyg and the Cool Hypergiants

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dc.creatorSchuster, Michael T.
dc.creatorHumphreys, Roberta M.
dc.creatorMarengo, Massimo
dc.date2005-09-30
dc.date.accessioned2026-07-07T11:24:49Z
dc.date.available2026-07-07T11:24:49Z
dc.descriptionWe 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.
dc.description28 pages, 8 figures, accepted for publication in The Astronomical Journal
dc.identifierhttps://arxiv.org/abs/astro-ph/0510010
dc.identifierhttp://arxiv.org/abs/astro-ph/0510010
dc.identifierAstron.J.131:603-611,2006
dc.identifierdoi:10.1086/498395
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195319
dc.subjectAstrophysics
dc.titleThe Circumstellar Environments of NML Cyg and the Cool Hypergiants
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