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Titolo:
Qualitative reproduction of stellar H2O maser morphology - I. Results at asingle stellar phase
Autore:
Humphreys, EML; Yates, JA; Gray, MD; Field, D; Bowen, GH;
Indirizzi:
Onsala Space Observ, S-43992 Onsala, Sweden Onsala Space Observ Onsala Sweden S-43992 Observ, S-43992 Onsala, Sweden Univ Coll London, Dept Phys & Astron, London WC1E 6BT, England Univ Coll London London England WC1E 6BT stron, London WC1E 6BT, England UMIST, Dept Phys, Manchester M60 1QD, Lancs, England UMIST Manchester Lancs England M60 1QD Manchester M60 1QD, Lancs, England Univ Aarhus, Inst Storage Ring Facilities, DK-8000 Aarhus C, Denmark Univ Aarhus Aarhus Denmark C Ring Facilities, DK-8000 Aarhus C, Denmark Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA Iowa State Univ Ames IA USA 50011 Dept Phys & Astron, Ames, IA 50011 USA
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 2, volume: 379, anno: 2001,
pagine: 501 - 514
SICI:
1432-0746(200111)379:2<501:QROSHM>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUBMILLIMETER WATER MASERS; LATE-TYPE STARS; CIRCUMSTELLAR ENVELOPES; MERLIN OBSERVATIONS; MIRA VARIABLES; EVOLVED STARS; SIO MASERS; VAPOR; LINESHAPES; EXCITATION;
Keywords:
masers; radiative transfer; stars : AGB and post-AGB; stars : mass-loss; hydrodynamics; circumstellar matter;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Humphreys, EML Onsala Space Observ, S-43992 Onsala, Sweden Onsala Space Observ Onsala Sweden S-43992 Onsala, Sweden
Citazione:
E.M.L. Humphreys et al., "Qualitative reproduction of stellar H2O maser morphology - I. Results at asingle stellar phase", ASTRON ASTR, 379(2), 2001, pp. 501-514

Abstract

We attempt to reproduce the observed morphologies of stellar H2O maser emission by combining a hydrodynamic pulsation model of a long-period variable(LPV) star with an H2O maser model. These numerical simulations yield synthetic maser lineshapes and interferometry images as a function of stellar pulsation phase. The results at a single stellar phase are presented here for 22, 321, 325 and 183 GHz masers. We compare our simulated data with the observed features of stellar H2O masers, and make predictions of the existence of new masers in the circumstellar environment. We also predict the appearance of 183, 321 and 325 GHz maser images which may be observable in future using the Atacama Large Millimetre Array (ALMA). These simulations correctly locate the shell of 22 GHz masers in the region of the circumstellar envelope (CE) in which material is being accelerated to form the steadily-out owing stellar wind.

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Documento generato il 05/12/20 alle ore 13:28:32