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H
2
O
GOM94 - Anomalous water masers in OH/IR stars.
Short title
: Gómez et al. (1994)
Authors
: Gómez, Y. Rodríguez, L. F. Contreras, M. E. Moran, J. M.
Journal
: Revista Mexicana de Astronomia y Astrofisica, Vol. 28, No. 1, p. 97 - 102
Bibcode
:
1994RMxAA..28...97G
Target type
: star
Abstract
The authors present OH (1612 MHz) and H
2
O (22.2 GHz) maser observations made with the VLA at an angular resolution of &equiv1""toward three OH/IR stars: OH 12.8-0.9, OH 37.1-0.8 and OH 42.3-0.1. These stars exhibit the H
2
O maser components in a velocity range that exceeds the OH velocity range, a situation in disagreement with the standard model for maser emission in late-type stars. The authors find that the OH and H
2
O maser positions agree within &equiv0""5 and that most likely both masers arise from the same source, ruling out the possibility of a fortuitous superposition of two different sources. The authors discuss some of the possible mechanisms that could explain the anomalous H
2
O maser emission. The most likely explanation is that these stars have axisymmetric winds and that the H
2
O emission originates in the polar regions with larger velocities than the regions closer to the equator where the OH emission arises. Very long baseline observations are required to test this explanation.
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Detection table from Gómez et al. (1994)
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individual components
ID
Obs. RA
Obs. Dec
l
b
Group id
Source name
Line
V
peak
F
peak
List
Detection
Class
Dist. (parallax)
Ref.
(J2000)
(J2000)
(deg.)
(deg.)
H
2
O
(km/s)
(Jy)
Yes
/
No
(kpc)
1
19 02 6.2
+03 20 15.5
37.1182
-0.8471
G37.118-0.847
OH 37.1-0.8
22 GHz
;
64.4
1.7
ENG_H2O
+H
2
O
-CH
3
OH I
-CH
3
OH II
+OH
+SiO
EVOLVED
GOM94
19 02 6.2
+03 20 15.5
37.1182
-0.8471
G37.118-0.847
OH 37.1-0.8
22 GHz
;
66.8
5
ENG_H2O
+H
2
O
-CH
3
OH I
-CH
3
OH II
+OH
+SiO
EVOLVED
GOM94
3
19 09 8.2
+08 16 33.9
42.3084
-0.1324
G42.308-0.132
OH 42.3-0.1
22 GHz
;
78.0
9
ENG_H2O
+H
2
O
+OH
+SiO
EVOLVED
GOM94
4
18 16 49.1
-18 15 2.1
12.8156
-0.8946
G12.816-0.895
OH 12.8-0.9
22 GHz
;
-78.6
0.8
ENG_H2O
+H
2
O
+OH
EVOLVED
GOM94
Non-detection table from Gómez et al. (1994)
Export table to csv
Hide
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Show
individual components
ID
Obs. RA
Obs. Dec
l
b
Group id
Source name
Line
F
peak
Date
RMS
List
Detection
Class
Ref.
(J2000)
(J2000)
(deg.)
(deg.)
H
2
O
(Jy)
(Jy)
Yes
/
No
1
19 09 8.2
+08 16 33.9
42.3084
-0.1324
G42.308-0.132
OH 42.3-0.1
22 GHz
;
0.12
1992-05-20
0.040
ENG_H2O
+H
2
O
+OH
+SiO
EVOLVED
GOM94
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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 'GOM94' 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 'GOM94' AND detected=true AND hide=false ORDER BY detected DESC,id
