The salty emission of the intermediate-mass AGB star OH 30.1−0.7

ABSTRACT We analyse continuum and molecular emission, observed with Atacama Large Millimetre/submillimetre Array, from the dust-enshrouded intermediate-mass asymptotic giant branch (AGB) star OH 30.1−0.7. We find a secondary peak in the continuum maps, ‘feature B’, separated by 4.6 arcsec from the AGB star, which corresponds to a projected separation of $1.8\times 10^{4}$ au, placing a lower limit on the physical separation. This feature is most likely composed of cold dust and is likely to be ejecta associated with the AGB star, though we cannot rule out that it is a background object. The molecular emission we detect includes lines of CO, SiS, CS, $\mathrm{SO}_2$, NS, NaCl, and KCl. We find that the NS emission is off centre and arranged along an axis perpendicular to the direction of feature B, indicative of a UV-emitting binary companion (e.g. a G-type main sequence star or hotter), perhaps on an eccentric orbit, contributing to its formation. However, the NaCl and KCl emission constrain the nature of that companion to not be hotter than a late B-type main-sequence star. We find relatively warm emission arising from the inner wind and detect several vibrationally excited lines of SiS ($\upsilon =1$), NaCl (up to $\upsilon =4$), and KCl (up to $\upsilon =2$), and emission from low-energy levels in the mid to outer envelope, as traced by $\mathrm{SO}_2$. The CO emission is abruptly truncated around 3.5 arcsec or 14 000 au from the continuum peak, suggesting that mass loss at a high rate may have commenced as little as 2800 yr ago.

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Journal
Monthly Notices of the Royal Astronomical Society
Published
2024-11-18
DOI
https://doi.org/10.1093/mnras/stae2584
Citations
3
Primary Topic
Stellar, planetary, and galactic studies
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article
Field-Weighted Citation Impact
0.99

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article

The salty emission of the intermediate-mass AGB star OH 30.1−0.7

Richard J. Stancliffe, C. Paladini, J. M. C. Plane, F. Kerschbaum et al.
3 citations
Monthly Notices of the Royal Astronomical Society
Stellar, planetary, and galactic studies
0.99
article

The salty emission of the intermediate-mass AGB star OH 30.1−0.7

Richard J. Stancliffe, C. Paladini, J. M. C. Plane, F. Kerschbaum, M. A. T. Groenewegen, L. Decin, T. J. Millar, A. M. S. Richards, A. de Koter, S. H. J. Wallström, T. Danilovich, M. Van de Sande, S. Etoka, D. Engels, C. A. Gottlieb, T. Khouri, Amanda I. Karakas, K. Justtanont, H. Olofsson, H. S. P. Müller
article en
3 citations

Abstract

ABSTRACT We analyse continuum and molecular emission, observed with Atacama Large Millimetre/submillimetre Array, from the dust-enshrouded intermediate-mass asymptotic giant branch (AGB) star OH 30.1−0.7. We find a secondary peak in the continuum maps, ‘feature B’, separated by 4.6 arcsec from the AGB star, which corresponds to a projected separation of $1.8\times 10^{4}$ au, placing a lower limit on the physical separation. This feature is most likely composed of cold dust and is likely to be ejecta associated with the AGB star, though we cannot rule out that it is a background object. The molecular emission we detect includes lines of CO, SiS, CS, $\mathrm{SO}_2$, NS, NaCl, and KCl. We find that the NS emission is off centre and arranged along an axis perpendicular to the direction of feature B, indicative of a UV-emitting binary companion (e.g. a G-type main sequence star or hotter), perhaps on an eccentric orbit, contributing to its formation. However, the NaCl and KCl emission constrain the nature of that companion to not be hotter than a late B-type main-sequence star. We find relatively warm emission arising from the inner wind and detect several vibrationally excited lines of SiS ($\upsilon =1$), NaCl (up to $\upsilon =4$), and KCl (up to $\upsilon =2$), and emission from low-energy levels in the mid to outer envelope, as traced by $\mathrm{SO}_2$. The CO emission is abruptly truncated around 3.5 arcsec or 14 000 au from the continuum peak, suggesting that mass loss at a high rate may have commenced as little as 2800 yr ago.

Monthly Notices of the Royal Astronomical SocietyVol. 536(1)
Leiden University (NL), Queen's University Belfast (GB), University of Vienna (AT), University of Leeds (GB), Universität Hamburg (DE), University of Cologne (DE), Royal Observatory of Belgium (BE), University of Manchester (GB), University of Bristol (GB), ASTRO-3D (AU), Institute of Astronomy (RU), Center for Astrophysics Harvard & Smithsonian (US), European Southern Observatory (CL), Astronomical Institute of the Slovak Academy of Sciences (SK), Astronomy and Space (AU), ARC Centre of Excellence for All-sky Astrophysics (AU), Monash University (AU), Chalmers University of Technology (SE), University of Amsterdam (NL), KU Leuven (BE)
National Science Foundation, American Society for Radiation Oncology, California Department of Fish and Game, University of Manchester, Swedish National Space Agency, Alberta Livestock and Meat Agency, Fonds Wetenschappelijk Onderzoek, Vetenskapsrådet, Science and Technology Facilities Council, Australian Research Council
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