2001A&A...375L...1V


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.16CEST07:54:00

2001A&A...375L...1V - Astronomy and Astrophysics, volume 375, L1-4 (2001/8-3)

Circular polarization of circumstellar water masers around S Per.

VLEMMINGS W., DIAMOND P.J. and VAN LANGEVELDE H.J.

Abstract (from CDS):

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 (616-523) 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.

Abstract Copyright:

Journal keyword(s): masers - polarization - stars: circumstellar matter - stars: individual (S Per) - stars: magnetic fields - stars: supergiants - techniques: interferometric

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 V* S Per s*r 02 22 51.7103845023 +58 35 11.454759954 13.22 10.55 7.90     M4.5-7Iae 351 0
2 V* VY CMa s*r 07 22 58.32877 -25 46 03.2355 12.01 10.19 7.95     M5Iae 984 0
3 V* U Her Mi* 16 25 47.4723609675 +18 53 32.862370166 8.85 8.23 6.70     M6.5-8+e 510 1
4 NML Cyg s*r 20 46 25.5382179476 +40 06 59.396202678   18.64 16.60     M7/8 481 0

    Equat.    Gal    SGal    Ecl

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2019.10.16-07:54:00

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