EDP Sciences
Free Access
Volume 537, January 2012
Article Number A5
Number of page(s) 78
Section Interstellar and circumstellar matter
DOI https://doi.org/10.1051/0004-6361/201117263
Published online 20 December 2011

Online material

Appendix A: List of the sources and their polarization parameters

Table A.1 lists the 117 detected sources and their polarization parameters derived for the strongest feature in the Stokes I, V and p parameters. The first three columns include the source name and J2000 equatorial coordinates. The name of each source observed with  ~0.07 km s-1 resolution is marked by superscript a. In Col. 4 we give the class of objects, where class I contains Miras and SRs, class II contains OH/IR objects and class III is formed by post-AGB and PN candidates. Column 5 shows the epoch of observation in MJD = JD−2 450 000. In Col. 6 we give only the frequency for which a total emission stronger than 0.15 Jy (~3σ) was detected. We include the results for the 15 stars, especially SRs and Miras, detected at 1665 MHz, but they are not used in the following statistical analysis because not all targets were surveyed. Column 7 contains the flux density Ip at the total intensity peak, together with the noise level (1σ). Columns 8 and 9 show the circularly polarized flux density, VIp and linearly polarized flux density, pIp, respectively, measured at the peak of total flux density. The upper limits for polarized flux density are marked in italics and by colon. Columns 10 and 11 give the fractional circular and linear polarizations, respectively, together with their uncertainties. Column 12 gives the velocity of peak flux density, vp, for which the polarized fluxes and fractional polarization were derived. The velocity is measured relative to the local standard of rest.

In several sources the velocities of the peak flux densities in the Stokes V and p parameters are different from those of the peak flux density in the Stokes I parameter. For these objects at each frequency Cols. 7–12 give in the second and third rows the polarization properties measured for the peak flux in the Stokes V and p parameters, respectively. The second and/or third rows are blank if the velocities of the peak fluxes in the Stokes V and/or p parameters are the same as those of Ip.

Table A.1

Results of polarimetric observations.

Appendix B: Full polarization spectra

OH spectra for all targets are displayed in Fig. B.1. In separate panels we show the Stokes I, left (LHC) and right (RHC) hand circular polarization, Stokes V, fractional circular polarization, Stokes Q and U, total linear polarization p, fractional linear polarization and polarization position angle at each frequency observed. The spectra of mC, mL and χ are omitted if no polarized features were detected at a  ~3σ level of about 0.15 Jy.

thumbnail Fig. B.1

Full polarization spectra.

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© ESO, 2012

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