ALMA spectrum of the extreme OH/IR star OH 26.5+0.6. Issue Volume 14:Issue S343(2019) (August 2018)

• Record Type: Journal Article
• Authors: Justtanont, K.; Muller, S.; Barlow, M. J.; Engels, D.; García-Hernández, D. A.; Groenewegen, M. A. T.; Matsuura, M.; Olofsson, H.; Teyssier, D.; Marti-Vidal, I.; Khouri, T.; Van de Sande, M.; Homan, W.; Danilovich, T.; de Koter, A.; Decin, L.; Waters, L. B. F. M.; Stancliffe, R.; Vlemmings, W.; Royer, P.; Kerschbaum, F.; Paladini, C.; Blommaert, J.; de Nutte, R.
• Editors: Kerschbaum, Franz; Groenewegen, Martin; Olofsson, Hans
• Is Part Of: Proceedings of the International Astronomical Union. Volume 14:Issue S343(2019)
• Page Start: 436
• Page End: 437
• Publication Date: 2018-08
• Subjects: stars: AGB and post-AGB, -- circumstellar matter, -- stars: individual (OH 26.5+0.6), -- stars: late-type, -- stars: abundances; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921318007986
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: We present ALMA band 7 data of the extreme OH/IR star, OH 26.5+0.6. In addition to lines of CO and its isotopologues, the circumstellar envelope also exhibits a number of emission lines due to metal-containing molecules, e.g., NaCl and KCl. A lack of C 18 O is expected, but a non-detection of C 17 O is puzzling given the strengths of H2 17 O in Herschel spectra of the star. However, a line associated with Si 17 O is detected. We also report a tentative detection of a gas-phase emission line of MgS. The ALMA spectrum of this object reveals intriguing features which may be used to investigate chemical processes and dust formation during a high mass-loss phase.