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A Circular Planetary Nebula around the OH/IR Star OH 354.88-0.54 (V1018 Sco) | Martin Cohen
; Quentin A Parker
; Jessica Chapman
; | Date: |
8 Dec 2004 | Journal: | Mon.Not.Roy.Astron.Soc. 357 (2005) 1189-1196 | Subject: | astro-ph | Affiliation: | 2,3) and Jessica Chapman ( UC. Berkeley, Macquarie University, Sydney, Australia Anglo-Australian Observatory, Australia Telescope National Facility | Abstract: | New deep, high-resolution H-alpha imagery from the UK Schmidt Telescope (UKST) Unit’s H-alpha survey of the Southern Galactic Plane reveals the presence of a faint, highly circular, planetary nebula surrounding a very long period variable star (now known as V1018 Sco), first discovered as a 1612-MHz OH maser, OH 354.88-0.54. The nebular phase-lag distance, diameter, and radial velocity are 3.2kpc, 0.3pc, and 13km/s, respectively. Combining the maser attributes with near-, mid-, and far-infrared data and with our optical spectrum of the ring we conclude that the object was an intermediate mass AGB star (initial stellar mass >4Msun in which the fast wind has recently turned on, ionizing previously shed circumstellar material. Hence, we speculate that we may be witnessing a hitherto unobserved phase of PN evolution, in which a PN has only recently started to form around a star that is unequivocally still in its AGB | Source: | arXiv, astro-ph/0412175 | Services: | Forum | Review | PDF | Favorites |
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