Catalogo Articoli (Spogli Riviste)
OPAC HELP
Titolo: Circular polarization of circumstellar water masers around S Per
Autore: Vlemmings, W; Diamond, PJ; van Langevelde, HJ;
- Indirizzi:
- Sterrewacht Leiden, NL-2300 RA Leiden, Netherlands Sterrewacht Leiden Leiden Netherlands NL-2300 RA RA Leiden, Netherlands Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England Univ Manchester Macclesfield Cheshire England SK11 9DL Cheshire, England Joint Inst VLBI Europe, NL-7990 AA Dwingeloo, Netherlands Joint Inst VLBI Europe Dwingeloo Netherlands NL-7990 AA loo, Netherlands
- Titolo Testata:
- ASTRONOMY & ASTROPHYSICS
fascicolo: 1,
volume: 375,
anno: 2001,
pagine: L1 - L4
- SICI:
- 1432-0746(200108)375:1<L1:CPOCWM>2.0.ZU;2-C
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- STRONG MAGNETIC-FIELDS; INTERFEROMETRIC OBSERVATIONS; H2O; ENVELOPE; PERSEI;
- Keywords:
- masers; polarization; stars : circumstellar matter; stars : individual (S Per); stars : magnetic fields; stars : supergiants; techniques : interferometric;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 19
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Vlemmings, W Sterrewacht Leiden, Postbus 9513, NL-2300 RA Leiden, Netherlands Sterrewacht Leiden Postbus 9513 Leiden Netherlands NL-2300 RA
-
-
-
- Citazione:
- W. Vlemmings et al., "Circular polarization of circumstellar water masers around S Per", ASTRON ASTR, 375(1), 2001, pp. L1-L4
Abstract
We present the first circular polarization measurements of circumstellar H2O masers. Previously the magnetic field in circumstellar envelopes has been estimated using polarization observations of SiO and OH masers. SiO masers are probes of the high temperature and density regime close to the central star. OH masers are found at much lower densities and temperatures, generally much further out in the circumstellar envelope. The detection of the circular polarization of the (6(16)-5(23)) rotational transition of the H2O maser could be attributed to Zeeman splitting due to the magnetic field in the intermediate temperature and density regime. The fields inferred here agree well with predicted values for a combination of the r(-2) dependence of a solar-type magnetic field, and the coupling of the field to the high density masing regions. We also discuss the unexpected narrowing of the circular polarization spectrum.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/05/13 alle ore 18:10:48