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• Target type: YSO
  

• Abstract

  We present the results of repeated observations of the H2O line at 22.2 GHz towards a sample of 54 Herbig Ae/Be stars. Maser emission has been detected in three sources only, V645 Cyg, LkHa± 234, and BD+40°4124, the latter being a first time detection. The main properties of BD+40°4124 and of the associated maser are discussed. With the detection of BD+40°4124, the number of Herbig Ae/Be stars with H2O masers amounts to a total of 7, with a detection rate of 10%. This figure is intermediate between that typical of low-mass stars, 1%, and of massive stars, 30%. In addition, 6 out of the 7 known masers are also CO outflow sources, strongly suggesting a common physical origin for the two phenomena.

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	Vrange	Vpeak	FWHM	Fpeak	∫F dv	Telescope	Vstep	RMS	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)			H2O	(km/s)	(km/s)	(km/s)	(Jy)	(Jy*km/s)		(km/s)	(Jy)	(arcsec)	Yes/No		(kpc)
1	20 20 28.4	+41 21 51.3	78.8721	2.7696	G78.870+2.762	BD+40°4124	22 GHz;	-87;-65	-76	0.164	1.8	24.3	MED	0.33	1.500	114	+H2O +OH	SFR_MIXED		24/04/90
	20 20 28.4	+41 21 51.3	78.8721	2.7696	G78.870+2.762	BD+40°4124	22 GHz;	-66;-88	-83.6	0.658	3.2	30.4	MED	0.33	1.500	114	+H2O +OH	SFR_MIXED		23/07/90
	20 20 28.4	+41 21 51.3	78.8721	2.7696	G78.870+2.762	BD+40°4124	22 GHz;	-66;-82	-72.7	0.164	56.1	225.2	MED	0.33	1.500	114	+H2O +OH	SFR_MIXED		24/10/90
	20 20 28.4	+41 21 51.3	78.8721	2.7696	G78.870+2.762	BD+40°4124	22 GHz;	-61;-96	-71.3	0.329	8.4	93	MED	0.33	1.500	114	+H2O +OH	SFR_MIXED		30/01/91
	20 20 28.4	+41 21 51.3	78.8721	2.7696	G78.870+2.762	BD+40°4124	22 GHz;	-68;-84	-80	0.082	9.7	60.1	MED	0.33	1.500	114	+H2O +OH	SFR_MIXED		21/05/91
	20 20 28.4	+41 21 51.3	78.8721	2.7696	G78.870+2.762	BD+40°4124	22 GHz;	26;29	27.1	0.082	7.6	8	MED	0.33	1.500	114	+H2O +OH	SFR_MIXED		21/01/91
	20 20 28.4	+41 21 51.3	78.8721	2.7696	G78.870+2.762	BD+40°4124	22 GHz;	26;28	27.1	0.082	8.2	9.2	MED	0.33	1.500	114	+H2O +OH	SFR_MIXED		23/05/91
8	21 39 58.2	+50 14 20.5	94.6024	-1.7962	G94.603-1.796	V645 Cyg	22 GHz;	-43;-50	-46	0.164	53.7	93.2	MED	0.33	1.500	114	+H2O -CH3OH I +CH3OH II -OH -SiO	SFR_MIXED		29/01/89
	21 39 58.2	+50 14 20.5	94.6024	-1.7962	G94.603-1.796	V645 Cyg	22 GHz;	-49;-46	-47.5	0.658	2.8		MED	0.33	1.500	114	+H2O -CH3OH I +CH3OH II -OH -SiO	SFR_MIXED		25/04/90
	21 39 58.2	+50 14 20.5	94.6024	-1.7962	G94.603-1.796	V645 Cyg	22 GHz;		-44.6	0.658	9.6		MED	0.33	1.500	114	+H2O -CH3OH I +CH3OH II -OH -SiO	SFR_MIXED		04/02/90
	21 39 58.2	+50 14 20.5	94.6024	-1.7962	G94.603-1.796	V645 Cyg	22 GHz;		-46.1		43.5		MED	0.33	1.500	114	+H2O -CH3OH I +CH3OH II -OH -SiO	SFR_MIXED		1979
12	21 43 2.3	+66 06 28.9	105.4050	9.8774	G105.405+9.877	LkHa 234	22 GHz;	-22.1;-10.8	-20.7	0.082	231.8	247.8	MED	0.33	1.500	114	+H2O -CH3OH I -CH3OH II	SFR_MIXED		02/04/90
	21 43 2.3	+66 06 28.9	105.4050	9.8774	G105.405+9.877	LkHa 234	22 GHz;	-24;-9	-22	0.329	119	152	MED	0.33	1.500	114	+H2O -CH3OH I -CH3OH II	SFR_MIXED		24/10/90
	21 43 2.3	+66 06 28.9	105.4050	9.8774	G105.405+9.877	LkHa 234	22 GHz;		-7.8	0.658	267.6		MED	0.33	1.500	114	+H2O -CH3OH I -CH3OH II	SFR_MIXED		10/02/90
	21 43 2.3	+66 06 28.9	105.4050	9.8774	G105.405+9.877	LkHa 234	22 GHz;		-8.3		43.1		MED	0.33	1.500	114	+H2O -CH3OH I -CH3OH II	SFR_MIXED		10/78
	21 43 2.3	+66 06 28.9	105.4050	9.8774	G105.405+9.877	LkHa 234	22 GHz;		-9.7		40		MED	0.33	1.500	114	+H2O -CH3OH I -CH3OH II	SFR_MIXED		02/79
	21 43 2.3	+66 06 28.9	105.4050	9.8774	G105.405+9.877	LkHa 234	22 GHz;		-19		39.3		MED	0.33	1.500	114	+H2O -CH3OH I -CH3OH II	SFR_MIXED		29/09/85

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	Fpeak	Telescope	Vstep	RMS	Beam	Detection	Class	Date
	(J2000)	(J2000)	(deg.)	(deg.)			H2O	(Jy)		(km/s)	(Jy)	(arcsec)	Yes/No
1	20 20 28.4	+41 21 51.3	78.8721	2.7696	G78.870+2.762	BD+40°4124	22 GHz;	<5.2	MED	0.33	1.500	114	+H2O +OH	SFR_MIXED	18/02/90
2	21 39 58.2	+50 14 20.5	94.6024	-1.7962	G94.603-1.796	V645 Cyg	22 GHz;	<2.3	MED	0.33	1.500	114	+H2O -CH3OH I +CH3OH II -OH -SiO	SFR_MIXED	17/07/90
	21 39 58.2	+50 14 20.5	94.6024	-1.7962	G94.603-1.796	V645 Cyg	22 GHz;	<8.5	MED	0.33	1.500	114	+H2O -CH3OH I +CH3OH II -OH -SiO	SFR_MIXED	24/10/90
4	00 11 26	+58 49 47	117.7644	-3.6401	G117.766-3.639	LkHa 198	22 GHz;		MED	0.33	1.420	114	+H2O -CH3OH I -CH3OH II -OH	SFR_MIXED	2
5	00 43 18.3	+61 54 40.3	121.9745	-0.9454	G121.975-0.946	BD+61°154	22 GHz;		MED	0.33	1.210	114	-H2O -CH3OH I	EVOLVED	2
6	02 16 30.2	+55 22 56.6	134.8789	-5.5038	G134.879-5.504	RNO6	22 GHz;		MED	0.33	1.190	114	-H2O -CH3OH I	SFR_MIXED	4
7	03 49 36.1	+38 58 55	156.7959	-11.9028	G156.797-11.902	XY Per A+B	22 GHz;		MED	0.33	1.080	114	-H2O -CH3OH I	EVOLVED	2
8	04 18 40.6	+28 19 15.9	168.8355	-15.5494	G168.835-15.549	Elias 1	22 GHz;		MED	0.33	0.980	114	-H2O -CH3OH I -OH	EVOLVED	2
9	04 37 30.5	+24 20 45.2	174.8201	-15.0315	G174.820-15.032	BD+24°676	22 GHz;		MED	0.33	1.270	114	-H2O		4
10	04 55 45.7	+30 33 5.9	172.4984	-7.9809	G172.498-7.982	AB Aur	22 GHz;		MED	0.33	1.350	114	-H2O -CH3OH I -CH3OH II -SiO	SFR_MIXED	2
11	05 11 36.4	-02 22 48.5	203.2050	-23.2126	G203.205-23.212	V1012 0ri	22 GHz;		MED	0.33	2.000	114	-H2O -CH3OH I -OH	SFR	4
12	05 31 28.1	+12 09 10.5	192.6353	-11.6229	G192.635-11.623	HK Ori	22 GHz;		MED	0.33	1.400	114	-H2O -CH3OH I -SiO	EVOLVED	2
13	05 35 9.6	+10 01 51.4	194.9696	-11.9411	G194.970-11.941	BD+9°880	22 GHz;		MED	0.33	1.150	114	-H2O -CH3OH I	EVOLVED	2
14	05 35 50.4	-05 28 35.2	209.1601	-19.2979	G209.160-19.298	T Ori	22 GHz;		MED	0.33	2.340	114	-H2O -CH3OH I	EVOLVED	3
15	05 36 25.4	-06 42 56.7	210.4043	-19.7242	G210.404-19.724	V380 Ori	22 GHz;		MED	0.33	1.300	114	-H2O -CH3OH I -CH3OH II	SFR_MIXED	1
16	05 37 13.3	-06 35 0.2	210.3722	-19.4879	G210.372-19.488	BF Ori	22 GHz;		MED	0.33	1.490	114	-H2O	EVOLVED	2
17	05 38 14.5	-05 24 48.6	209.3864	-18.7359	G209.393-18.739	HD 37411	22 GHz;		MED	0.33	1.510	114	-H2O -CH3OH I	EVOLVED	2
18	05 39 30.1	+26 22 26.3	181.4663	-2.5003	G181.467-2.499	RR Tau	22 GHz;		MED	0.33	1.320	114	-H2O -CH3OH I	EVOLVED	2
19	05 39 31.5	+04 06 35.2	200.7873	-13.9641	G200.787-13.964	HD 37490	22 GHz;		MED	0.33	1.410	114	-H2O		3
20	06 01 58.4	+16 30 54.7	192.6213	-3.0444	G192.623-3.040	HD 250550	22 GHz;		MED	0.33	1.390	114	+H2O -CH3OH I -OH	SFR_MIXED	2
21	06 07 49.5	+18 39 27.2	191.4339	-0.7805	G191.434-0.780	LkHa 208	22 GHz;		MED	0.33	1.340	114	+H2O	EVOLVED	2
22	06 18 44.9	+15 16 43.4	195.6511	-0.1081	G195.651-0.108	MWC 137	22 GHz;		MED	0.33	1.280	114	-H2O -CH3OH I -CH3OH II	SFR_MIXED	3
23	06 31 9.2	+10 26 10.2	201.3449	0.2995	G201.342+0.291	VY Mon	22 GHz;		MED	0.33	1.260	114	-H2O -CH3OH I -CH3OH II -SiO	SFR_MIXED	4
24	06 32 40.9	+10 09 33.6	201.7643	0.5051	G201.765+0.507	LkHa 215	22 GHz;		MED	0.33	1.050	114	-H2O -CH3OH I -CH3OH II	EVOLVED	1
25	06 33 4.4	+10 19 20.9	201.6640	0.6659	G201.664+0.666	HD 259431	22 GHz;		MED	0.33	1.060	114	-H2O -CH3OH II	SFR_MIXED	2
26	06 39 10	+08 44 10.5	203.7635	1.2709	G203.763+1.271	R Mon	22 GHz;		MED	0.33	1.360	114	-H2O -CH3OH I -CH3OH II -OH	EVOLVED	2
27	06 40 44.6	+09 48 1.7	202.9948	2.1038	G202.995+2.104	LkHa 25	22 GHz;		MED	0.33	1.450	114	-H2O -CH3OH I -OH	SFR_MIXED	2
28	07 01 44.9	-11 17 21.8	224.1522	-2.8668	G224.152-2.867	HD 52721	22 GHz;		MED	0.33	2.140	114	-H2O		3
29	07 02 42.6	-11 26 11.9	224.3911	-2.7240	G224.391-2.725	LkHa218	22 GHz;		MED	0.33	1.720	114	-H2O -CH3OH I	EVOLVED	3
30	07 03 43.2	-11 33 6.1	224.6066	-2.5564	G224.607-2.557	Z CMa	22 GHz;		MED	0.33	1.330	114	+H2O -CH3OH I -CH3OH II -OH	SFR_MIXED	3
31	07 04 6.9	-11 26 6.8	224.5470	-2.4173	G224.547-2.418	LkHa 220	22 GHz;		MED	0.33	1.440	114	-H2O -CH3OH I	SFR_MIXED	3
32	07 04 21.9	-10 26 32.8	223.6918	-1.9084	G223.706-1.901	HD 53367	22 GHz;		MED	0.33	1.310	114	-H2O -CH3OH I	EVOLVED	3
33	16 40 13.4	-23 52 48.1	355.6000	14.8504	G355.600+14.850	HD 150193	22 GHz;		MED	0.33	2.060	114	-H2O		3
34	17 10 08	-27 15 19.1	357.0640	7.4477	G357.064+7.448	KK Oph	22 GHz;		MED	0.33	2.150	114	-H2O -CH3OH I +SiO	EVOLVED	3
35	17 56 18.6	-21 56 22.7	7.2460	1.5069	G7.246+1.507	HD 163296	22 GHz;		MED	0.33	2.330	114	-H2O	EVOLVED	3
36	18 05 49.7	-24 15 19.2	6.3189	-1.5416	G6.319-1.542	LkHa 118	22 GHz;		MED	0.33	1.570	114	-H2O	EVOLVED	5 .
37	18 27 40.5	-03 51 21	26.7816	3.5112	G26.782+3.511	MWC 297	22 GHz;		MED	0.33	1.560	114	-H2O	SFR	3
38	18 28 47.9	+00 08 39.1	30.4732	5.1014	G30.473+5.101	VV Ser	22 GHz;		MED	0.33	1.510	114	+H2O -CH3OH I	EVOLVED	2
39	18 29 22.8	-06 03 57.7	25.0161	2.1126	G25.012+2.097	MWC 300	22 GHz;		MED	0.33	1.330	114	-H2O -CH3OH I -CH3OH II -OH -SiO	EVOLVED	3
40	18 33 21.3	-04 58 6.4	26.4472	1.7419	G26.448+1.743	AS 310	22 GHz;		MED	0.33	1.620	114	-H2O -CH3OH I -CH3OH II	SFR_MIXED	5
41	19 25 58.7	+21 12 30.8	55.6443	2.3146	G55.645+2.314	WW Vul	22 GHz;		MED	0.33	1.490	114	-H2O -CH3OH I	EVOLVED	4
42	19 29 0.8	+09 38 38.7	45.8155	-3.8315	G45.817-3.832	Par 21 .	22 GHz;		MED	0.33	1.840	114	-H2O -CH3OH I	EVOLVED	4
43	20 24 16.4	+42 17 46.9	80.0427	2.7190	G80.045+2.723	BD+41°3731	22 GHz;		MED	0.33	1.080	114	-H2O -CH3OH I	SFR_MIXED	2
44	20 45 54	+67 57 38.8	102.9698	15.2315	G102.970+15.231	PV Cep	22 GHz;		MED	0.33	1.380	114	+H2O -CH3OH I -CH3OH II -OH	EVOLVED	2
45	20 47 23.4	+43 44 39.7	83.7393	0.2115	G83.739+0.212	V517 Cyg	22 GHz;		MED	0.33	1.110	114	-H2O -CH3OH I	EVOLVED	6
46	20 47 37.5	+43 47 25.4	83.8017	0.2075	G83.802+0.207	AS 442	22 GHz;		MED	0.33	1.100	114	-H2O -CH3OH I	SFR_MIXED	2
47	20 58 53.7	+44 15 28.4	85.4598	-1.0469	G85.460-1.047	V1057 Cyg	22 GHz;		MED	0.33	1.210	114	+H2O -CH3OH I -CH3OH II -SiO	SFR_MIXED	5
48	21 01 36.9	+68 09 47.6	104.0615	14.1925	G104.062+14.193	HD 200775	22 GHz;		MED	0.33	1.000	114	-H2O -CH3OH I -CH3OH II	SFR_MIXED	3
49	21 52 34.1	+47 13 43.9	94.2490	-5.4356	G94.250-5.436	BD+46°3471	22 GHz;		MED	0.33	1.570	114	-H2O -CH3OH I -CH3OH II	SFR_MIXED	2
50	21 54 18.9	+47 12 10.9	94.4650	-5.6416	G94.465-5.642	LkHa 257	22 GHz;		MED	0.33	1.200	114	-H2O -CH3OH I	EVOLVED	5
51	22 34 41	+40 40 3.7	96.7291	-15.1444	G96.729-15.144	LkHa 233	22 GHz;		MED	0.33	1.300	114	-H2O -CH3OH I	GALAXY	2
52	22 53 15.2	+62 07 58.6	109.5940	2.3614	G109.600+2.373	HD 216629	22 GHz;		MED	0.33	1.310	114	-H2O -CH3OH I	EVOLVED	2
53	23 17 25.8	+60 50 44.9	111.7298	0.0352	G111.730+0.035	MWC 1080	22 GHz;		MED	0.33	1.080	114	-H2O -CH3OH I -CH3OH II	SFR_MIXED	1
54	23 58 41.5	+66 26 11.9	117.6860	4.1036	G117.686+4.104	MacC H4	22 GHz;		MED	0.33	1.370	114	+H2O -CH3OH I	EVOLVED	4

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