2012A&A...542A..64J


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.16CET04:11:43

2012A&A...542A..64J - Astronomy and Astrophysics, volume 542A, 64-64 (2012/6-1)

Magnetic fields in central stars of planetary nebulae?

JORDAN S., BAGNULO S., WERNER K. and O'TOOLE S.J.

Abstract (from CDS):

Most planetary nebulae have bipolar or other non-spherically symmetric shapes. Magnetic fields in the central star may be responsible for this lack of symmetry, but observational studies published to date have reported contradictory results. We search for correlations between a magnetic field and departures from the spherical geometry of the envelopes of planetary nebulae. We determine the magnetic fields from spectropolarimetric observations of ten central stars of planetary nebulae. The results of the analysis of the observations of four stars were previously presented and discussed in the literature, while the observations of six stars, plus additional measurements of a star previously observed, are presented here for the first time. All our determinations of magnetic field in the central planetary nebulae are consistent with null results. Our field measurements have a typical error bar of 150-300G. Previous spurious field detections using data acquired with FORS1 (FOcal Reducer and low dispersion Spectrograph) of the Unit Telescope 1 (UT1) of the Very Large Telescope (VLT) were probably due to the use of different wavelength calibration solutions for frames obtained at different position angles of the retarder waveplate. There is currently no observational evidence of magnetic fields with a strength of the order of hundreds Gauss or higher in the central stars of planetary nebulae.

Abstract Copyright:

Journal keyword(s): stars: magnetic field - stars: AGB and post-AGB

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 1360 PN 03 33 14.6471964691 -25 52 17.981057073   10.95 11.16     sdO 266 0
2 EGB 5 HS* 08 11 12.7659921835 +10 57 17.099261604     14.2     sdB 47 1
3 PN HbDs 1 PN 09 52 44.5227859639 -46 16 47.455337619 11.11 12.28 12.50 12.66   O(H)3Vz 73 0
4 NGC 4361 PN 12 24 30.7509091298 -18 47 05.564628299   12.8 13.2     [WC] 382 1
5 PN A66 36 PN 13 40 41.3452732644 -19 52 55.322455515   11.27 11.57     sdO7 153 0
6 PN DS 2 PN 15 43 05.0422231267 -39 18 14.606352567   11.94 11.91     sdO 39 0
7 PN H 2-1 PN 17 04 36.2535135873 -33 59 18.777826386     13.25     O 135 0
8 IC 4637 PN 17 05 10.47 -40 53 07.7     9.20     ~ 123 0
9 HD 160917 * 17 44 43.8390375975 -46 02 33.403918385   6.71 6.72     B9V 14 0
10 PN Tc 1 PN 17 45 35.2877697798 -46 05 23.713203258   11.30 11.49     PCyg 236 0
11 NGC 7293 PN 22 29 38.5453078023 -20 50 13.746093105 11.894 13.158 13.524 13.689 13.898 DAO.5 885 0

    Equat.    Gal    SGal    Ecl

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2019.12.16-04:11:43

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