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H
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VLE08B - The magnetic field of the proto-planetary nebula candidate IRAS 19296+2227
Interferometry data
Short title
: Vlemmings & van Langevelde (2008B)
Authors
: Vlemmings, W. H. T.van Langevelde, H. J.
Journal
: Astronomy and Astrophysics, Volume 488, Issue 2, 2008, pp.619-622
Bibcode
:
2008A&A...488..619V
Target type
: High_mass_SFR
Abstract
Context: Magnetic fields are thought to be one of the possible mechanisms responsible for shaping the generally spherical outflow of evolved stars into often aspherical planetary nebulae. However, direct measurements of magnetic fields during the transition to the planetary nebula phase are rare.
Aims: The aim of this project is to expand the number of magnetic field measurements of stars in the (proto-)planetary nebula phase and find if the magnetic field strength is sufficient to affect the stellar outflow.
Methods: We used Very Long Baseline Array observations to measure the circular polarization due to the Zeeman splitting of 22 GHz H2O masers in the envelope of the proto-planetary nebula candidate star IRAS 19296+2227 and the planetary nebula K3-35.
Results: A strong magnetic field of B_=-135±28 is detected in the H2O maser region of the proto-planetary nebula candidate IRAS 19296+2227. The H2O masers of K3-35 are too weak to detect circular polarization although we do present the measurements of weak linear polarization in those masers.
Conclusions: The field measured in the masers of IRAS 19296+2227 is dynamically important and, if it is representative of the large scale field, is an important factor in driving the stellar mass loss and shaping the stellar outflow.
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Detection table from Vlemmings & van Langevelde (2008B)
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individual components
ID
Obs. RA
Obs. Dec
RA offset
Dec offset
l
b
Group id
#
Source name
Image
Descr.
Line
V
peak
F
peak
Telescope
V
step
RMS
Beam
Detection
Class
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
H
2
O
(km/s)
(Jy/beam)
(km/s)
(mJy/beam)
(arcsec)
Yes
/
No
(kpc)
1
+19 31 45.9
+22 33 43.4
57.475615
1.781155
G57.475+1.781
IRAS 19296+2227
Image
Descr
22 GHz
;
38.04 .. 40.75
0.07 .. 8.13
VLBA
0.1
8.200
0.001 x 0.0007
+H
2
O
-CH
3
OH II
+OH
-SiO
EVOLVED
2003 Jun 20
+19 31 45.9004
+22 33 43.3905
6.18 mas
-11.07 mas
57.475613
1.781152
1
IRAS 19296+2227
38.04
0.54
+19 31 45.9002
+22 33 43.3952
3.49 mas
-6.37 mas
57.475614
1.781153
2
IRAS 19296+2227
38.64
0.11
+19 31 45.8989
+22 33 43.4055
-16.73 mas
3.86 mas
57.475614
1.781159
3
IRAS 19296+2227
40.07
0.08
+19 31 45.9001
+22 33 43.4013
0.88 mas
-0.3 mas
57.475615
1.781155
4
IRAS 19296+2227
40.28
1.70
+19 31 45.9
+22 33 43.4005
0.46 mas
-1.12 mas
57.475615
1.781155
5
IRAS 19296+2227
40.30
0.24
+19 31 45.9
+22 33 43.4016
0 mas
0 mas
57.475615
1.781155
6
IRAS 19296+2227
40.33
8.13
+19 31 45.8999
+22 33 43.3994
-1.55 mas
-2.23 mas
57.475614
1.781155
7
IRAS 19296+2227
40.34
0.07
+19 31 45.8989
+22 33 43.4066
-16.04 mas
4.99 mas
57.475614
1.781159
8
IRAS 19296+2227
40.75
0.18
2
+19 27 44
+21 30 3.4
56.096009
2.093776
G56.096+2.094
K3-35
Image
22 GHz
;
21.26 .. 22.58
0.22 .. 3.47
VLBA
0.1
8.200
0.001 x 0.0007
+H
2
O
+OH
EVOLVED
2003 Jun 20
+19 27 44.0009
+21 30 3.4071
14 mas
8.7 mas
56.096012
2.093774
1
K3-35
21.26
0.22
+19 27 44.0003
+21 30 3.40195
5.54 mas
3.55 mas
56.096010
2.093776
2
K3-35
22.16
0.23
+19 27 43.9999
+21 30 3.3984
0 mas
0 mas
56.096008
2.093777
3
K3-35
22.58
3.47
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DSS colored
2MASS colored
WISE colored
SDSS color
IRAC color I1,I2,I4
GLIMPSE 360
PACS color (70-160 um)
SPIRE color (250-500 um)
NVSS (1.4GHz)
ATLASGAL 870 um
ATLASGAL 870 um + Planck
Bolocam 1.1 mm
UKIDSS K
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select MAX(h2o_data_all.ra_hms) as ra_hms,MAX(h2o_data_all.dec_dms) as dec_dms,MAX(h2o_data_all.source_name) as source_name,MAX(h2o_data_all.ra) as ra,MAX(h2o_data_all.dec) as dec,MAX(h2o_data_all.l) as l,MAX(h2o_data_all.b) as b,MAX(h2o_data_all.grp) as grp,MAX(h2o_data_all.other_name) as other_name,MAX(h2o_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(h2o_data_all.line) as line,MAX(h2o_data_all.vrange) as vrange,MAX(h2o_data_all.vpeak) as vpeak,MAX(h2o_data_all.peak) as peak,MAX(h2o_data_all.fwhm) as fwhm,MAX(h2o_data_all.int) as int,MAX(h2o_data_all.rms) as rms,MAX(h2o_data_all.units) as units,MAX(h2o_data_all.units_rms) as units_rms,MAX(h2o_data_all.date_txt) as date_txt,MAX(h2o_data_all.telescope_ref) as telescope_ref,MAX(h2o_data_all.telescope_conf) as telescope_conf,MAX(h2o_data_all.v_step) as v_step,MAX(h2o_data_all.beam) as beam,MAX(h2o_data_all.beam_maj) as beam_maj,MAX(h2o_data_all.beam_min) as beam_min,MAX(h2o_data_all.beam_pa) as beam_pa,MAX(h2o_data_all.ref) as ref,MAX(h2o_data_all.list_ref) as list_ref,MAX(h2o_data_all.ascii) as ascii,MAX(h2o_data_all.url) as url,MAX(h2o_data_all.image) as image,MAX(h2o_data_all.image2) as image2,MAX(h2o_data_all.image3) as image3,MAX(h2o_data_all.descr) as descr,MAX(h2o_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(h2o_data_all.dist) as dist,1 as dist_parallax,MAX(h2o_data_all.date_txt) as date_txt,MAX(line_det) as line_det,MAX(type) as type,MAX(simbad_types_cat) as simbad_types_cat FROM h2o_data_all LEFT JOIN all_objects_withmet ON h2o_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON h2o_data_all.line=transitions."Line" WHERE ref ilike 'VLE08B' AND detected=true AND hide=false GROUP BY ref
select h2o_data_all.ra_hms,h2o_data_all.dec_dms,h2o_data_all.source_name,h2o_data_all.ra,h2o_data_all.dec,h2o_data_all.l,h2o_data_all.b,h2o_data_all.grp,h2o_data_all.other_name,h2o_data_all.other_desc,h2o_data_all.thermal,h2o_data_all.line,h2o_data_all.vrange,h2o_data_all.vpeak,h2o_data_all.peak,h2o_data_all.fwhm,h2o_data_all.int,h2o_data_all.rms,h2o_data_all.units,h2o_data_all.units_rms,h2o_data_all.date_txt,h2o_data_all.telescope_ref,h2o_data_all.telescope_conf,h2o_data_all.v_step,h2o_data_all.beam,h2o_data_all.beam_maj,h2o_data_all.beam_min,h2o_data_all.beam_pa,h2o_data_all.ref,h2o_data_all.list_ref,h2o_data_all.ascii,h2o_data_all.url,h2o_data_all.image,h2o_data_all.image2,h2o_data_all.image3,h2o_data_all.descr,h2o_data_all.id,h2o_data_all.mjy_flag,h2o_data_all.rms_mjy_flag,h2o_data_all.dist,h2o_data_all.dist_parallax,h2o_data_all.date_txt,line_det,type,simbad_types_cat FROM h2o_data_all LEFT JOIN all_objects_withmet ON h2o_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON h2o_data_all.line=transitions."Line" WHERE ref ilike 'VLE08B' AND detected=true AND hide=false ORDER BY detected DESC,id
