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IMA11B - Annual Parallax Distance and Kinematical Property of H₂O Masers in IRAS 19312+1950

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Short title: Imai et al. (2011b)
Authors: Imai, HiroshiTafoya, DanielHonma, MarekiHirota, TomoyaMiyaji, Takeshi
Journal: Publications of the Astronomical Society of Japan, Vol.63, No.1, pp.81--87
Bibcode:

Target type: High_mass_SFR

Abstract
We report on results of astrometric observations of H2O masers in the pre-planetary nebula candidate source IRAS 19312-1950 with the VLBI Exploration of Radio Astrometry (VERA), yielding an annual parallax, π = 263�47 μas, and a secular motion, (μα, μδ) = (-2.61�0.47, -6.73�0.14) [mas yr-1], for IRAS 19312+1950. We then derived a heliocentric distance of D = 3.80+0.83-0.58 kpc, a location in the Galaxy (R, z) = (7.07�0.12kpc, 28�3pc), and a three-dimensional velocity vector (VR, Vθ, Vz) = (33�28, 214�4, -14�8) [km s-1] in galactic cylindrical coordinates. Based on these parameters, we discuss the intrinsic properties of IRAS 19312+1950. We estimated the mass of the central star to be ∼8Modot and the deviation of the source motion from the circular galactic rotation to be ∼40km s-1. These are consistent with this source being an intermediate-mass late AGB or early post-AGB star.

Abstract

We report on results of astrometric observations of H2O masers in the pre-planetary nebula candidate source IRAS 19312-1950 with the VLBI Exploration of Radio Astrometry (VERA), yielding an annual parallax, π = 263�47 μas, and a secular motion, (μα, μδ) = (-2.61�0.47, -6.73�0.14) [mas yr-1], for IRAS 19312+1950. We then derived a heliocentric distance of D = 3.80+0.83-0.58 kpc, a location in the Galaxy (R, z) = (7.07�0.12kpc, 28�3pc), and a three-dimensional velocity vector (VR, Vθ, Vz) = (33�28, 214�4, -14�8) [km s-1] in galactic cylindrical coordinates. Based on these parameters, we discuss the intrinsic properties of IRAS 19312+1950. We estimated the mass of the central star to be ∼8Modot and the deviation of the source motion from the circular galactic rotation to be ∼40km s-1. These are consistent with this source being an intermediate-mass late AGB or early post-AGB star.

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Detection table from Imai et al. (2011b)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Source name	Image	Descr.	Line	V_peak	F_peak	Epoch	Telescope	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						H₂O	(km/s)	(Jy)	#		Yes/No		(kpc)
1	+19 33 24.243	+19 56 55.0065			55.370567	0.185457	G55.371+0.185		IRAS 19312+1950	Image	Descr	22 GHz;				VERA	+H₂O +CH₃OH I -CH₃OH II +OH +SiO	SFR_MIXED	3.80 (-0.58 +0.83)	2007 Oct - 2009 Aug
	+19 33 24.244528	+19 56 55.01945	22.92 mas	13.01 mas	55.370573	0.185454		1	IRAS 19312+1950				18.20	0.43	2007 October 25
	+19 33 24.2445373	+19 56 55.01952	23.06 mas	13.08 mas	55.370573	0.185454		2	IRAS 19312+1950				17.77	2.85
	+19 33 24.2445453	+19 56 55.01943	23.18 mas	12.99 mas	55.370573	0.185453		3	IRAS 19312+1950				17.35	6.24
	+19 33 24.2445587	+19 56 55.01929	23.38 mas	12.85 mas	55.370573	0.185453		4	IRAS 19312+1950				16.93	5.51
	+19 33 24.2445773	+19 56 55.01916	23.66 mas	12.72 mas	55.370573	0.185453		5	IRAS 19312+1950				16.51	2.69
	+19 33 24.2445893	+19 56 55.01919	23.84 mas	12.75 mas	55.370573	0.185453		6	IRAS 19312+1950				16.09	1.11
	+19 33 24.2447073	+19 56 55.01908	25.61 mas	12.64 mas	55.370573	0.185453		7	IRAS 19312+1950				16.93	1.63
	+19 33 24.2447047	+19 56 55.01912	25.57 mas	12.68 mas	55.370573	0.185453		8	IRAS 19312+1950				16.51	1.57
	+19 33 24.24471	+19 56 55.01904	25.65 mas	12.6 mas	55.370573	0.185453		9	IRAS 19312+1950				16.09	1.34
	+19 33 24.244524	+19 56 55.01872	22.86 mas	12.28 mas	55.370573	0.185453		10	IRAS 19312+1950				18.20	0.45	2007 November 29
	+19 33 24.2445247	+19 56 55.01876	22.87 mas	12.32 mas	55.370573	0.185453		11	IRAS 19312+1950				17.77	2.44
	+19 33 24.244532	+19 56 55.01864	22.98 mas	12.2 mas	55.370573	0.185453		12	IRAS 19312+1950				17.35	5.71
	+19 33 24.2445433	+19 56 55.01851	23.15 mas	12.07 mas	55.370573	0.185453		13	IRAS 19312+1950				16.93	5.23
	+19 33 24.2445633	+19 56 55.01842	23.45 mas	11.98 mas	55.370573	0.185453		14	IRAS 19312+1950				16.51	2.48
	+19 33 24.2445807	+19 56 55.0184	23.71 mas	11.96 mas	55.370573	0.185453		15	IRAS 19312+1950				16.09	1.01
	+19 33 24.2446933	+19 56 55.01833	25.4 mas	11.89 mas	55.370573	0.185453		16	IRAS 19312+1950				16.93	2.18
	+19 33 24.2446913	+19 56 55.01834	25.37 mas	11.9 mas	55.370573	0.185453		17	IRAS 19312+1950				16.51	1.81
	+19 33 24.2446913	+19 56 55.01859	25.37 mas	12.15 mas	55.370573	0.185453		18	IRAS 19312+1950				16.09	0.66
	+19 33 24.2446027	+19 56 55.02082	24.04 mas	14.38 mas	55.370574	0.185453		19	IRAS 19312+1950				16.51	0.98
	+19 33 24.244706	+19 56 55.01807	25.59 mas	11.63 mas	55.370573	0.185453		20	IRAS 19312+1950				16.09	0.94
	+19 33 24.244558	+19 56 55.01802	23.37 mas	11.58 mas	55.370573	0.185453		21	IRAS 19312+1950				16.93	1.59	2007 December 25
	+19 33 24.244566	+19 56 55.01779	23.49 mas	11.35 mas	55.370573	0.185453		22	IRAS 19312+1950				16.51	1.58
	+19 33 24.2446773	+19 56 55.01795	25.16 mas	11.51 mas	55.370573	0.185453		23	IRAS 19312+1950				16.51	1.32
	+19 33 24.2446913	+19 56 55.01776	25.37 mas	11.32 mas	55.370573	0.185453		24	IRAS 19312+1950				16.09	0.71
	+19 33 24.2445213	+19 56 55.01768	22.82 mas	11.24 mas	55.370573	0.185453		25	IRAS 19312+1950				18.20	0.33	2008 February 11
	+19 33 24.2445187	+19 56 55.01768	22.78 mas	11.24 mas	55.370573	0.185453		26	IRAS 19312+1950				17.77	1.49
	+19 33 24.244522	+19 56 55.01756	22.83 mas	11.12 mas	55.370573	0.185453		27	IRAS 19312+1950				17.35	4.48
	+19 33 24.2445293	+19 56 55.01744	22.94 mas	11 mas	55.370573	0.185453		28	IRAS 19312+1950				16.93	4.66
	+19 33 24.244544	+19 56 55.01736	23.16 mas	10.92 mas	55.370573	0.185453		29	IRAS 19312+1950				16.51	1.92
	+19 33 24.2445507	+19 56 55.01711	23.26 mas	10.67 mas	55.370573	0.185453		30	IRAS 19312+1950				16.09	0.44
	+19 33 24.2446807	+19 56 55.01729	25.21 mas	10.85 mas	55.370573	0.185453		31	IRAS 19312+1950				16.51	0.62
	+19 33 24.2446987	+19 56 55.01699	25.48 mas	10.55 mas	55.370573	0.185453		32	IRAS 19312+1950				16.09	0.50
	+19 33 24.244554	+19 56 55.01756	23.31 mas	11.12 mas	55.370573	0.185453		33	IRAS 19312+1950				16.09	0.61
	+19 33 24.2445053	+19 56 55.01688	22.58 mas	10.44 mas	55.370572	0.185453		34	IRAS 19312+1950				17.77	0.85	2008 March 20
	+19 33 24.244508	+19 56 55.01677	22.62 mas	10.33 mas	55.370572	0.185453		35	IRAS 19312+1950				17.35	2.78
	+19 33 24.2445147	+19 56 55.0167	22.72 mas	10.26 mas	55.370572	0.185453		36	IRAS 19312+1950				16.93	3.10
	+19 33 24.2445087	+19 56 55.01669	22.63 mas	10.25 mas	55.370572	0.185453		37	IRAS 19312+1950				16.51	0.78
	+19 33 24.2445447	+19 56 55.01652	23.17 mas	10.08 mas	55.370572	0.185453		38	IRAS 19312+1950				16.51	0.87
	+19 33 24.2445387	+19 56 55.01665	23.08 mas	10.21 mas	55.370572	0.185453		39	IRAS 19312+1950				16.09	0.50
	+19 33 24.2444727	+19 56 55.01643	22.09 mas	9.99 mas	55.370572	0.185453		40	IRAS 19312+1950				17.77	0.65	2008 April 15
	+19 33 24.244478	+19 56 55.01639	22.17 mas	9.95 mas	55.370572	0.185453		41	IRAS 19312+1950				17.35	3.08
	+19 33 24.2444847	+19 56 55.01631	22.27 mas	9.87 mas	55.370572	0.185453		42	IRAS 19312+1950				16.93	3.02
	+19 33 24.2445007	+19 56 55.01625	22.51 mas	9.81 mas	55.370572	0.185453		43	IRAS 19312+1950				16.51	1.06
	+19 33 24.2444287	+19 56 55.01642	21.43 mas	9.98 mas	55.370572	0.185453		44	IRAS 19312+1950				17.35	2.65	2008 May 21
	+19 33 24.244424	+19 56 55.01659	21.36 mas	10.15 mas	55.370572	0.185454		45	IRAS 19312+1950				16.93	2.31
	+19 33 24.244388	+19 56 55.01577	20.82 mas	9.33 mas	55.370572	0.185454		46	IRAS 19312+1950				17.35	1.19	2008 June 30
	+19 33 24.2444207	+19 56 55.01583	21.31 mas	9.39 mas	55.370572	0.185453		47	IRAS 19312+1950				17.35	1.08
	+19 33 24.244412	+19 56 55.01574	21.18 mas	9.3 mas	55.370572	0.185453		48	IRAS 19312+1950				16.93	2.10
	+19 33 24.2443927	+19 56 55.01545	20.89 mas	9.01 mas	55.370572	0.185453		49	IRAS 19312+1950				16.93	1.82	2008 July 29
	+19 33 24.2442947	+19 56 55.00949	19.42 mas	3.05 mas	55.370570	0.185453		50	IRAS 19312+1950				17.35	1.06	2008 December 1 1
	+19 33 24.244294	+19 56 55.00955	19.41 mas	3.11 mas	55.370570	0.185453		51	IRAS 19312+1950				16.93	1.00
	+19 33 24.244332	+19 56 55.01223	19.98 mas	5.79 mas	55.370571	0.185453		52	IRAS 19312+1950				17.35	1.58
	+19 33 24.24434	+19 56 55.01175	20.1 mas	5.31 mas	55.370571	0.185453		53	IRAS 19312+1950				17.35	2.06
	+19 33 24.2443547	+19 56 55.01187	20.32 mas	5.43 mas	55.370571	0.185453		54	IRAS 19312+1950				16.93	2.96
	+19 33 24.2443573	+19 56 55.01186	20.36 mas	5.42 mas	55.370571	0.185453		55	IRAS 19312+1950				16.51	1.46
	+19 33 24.2445593	+19 56 55.01149	23.39 mas	5.05 mas	55.370571	0.185452		56	IRAS 19312+1950				16.51	1.12
	+19 33 24.244566	+19 56 55.01152	23.49 mas	5.08 mas	55.370571	0.185452		57	IRAS 19312+1950				16.09	1.49
	+19 33 24.2443267	+19 56 55.01096	19.9 mas	4.52 mas	55.370571	0.185453		58	IRAS 19312+1950				17.35	1.72	2009 January 13
	+19 33 24.2443433	+19 56 55.01091	20.15 mas	4.47 mas	55.370571	0.185453		59	IRAS 19312+1950				16.93	1.92
	+19 33 24.2443273	+19 56 55.01089	19.91 mas	4.45 mas	55.370571	0.185453		60	IRAS 19312+1950				16.51	0.58
	+19 33 24.2443687	+19 56 55.0109	20.53 mas	4.46 mas	55.370571	0.185453		61	IRAS 19312+1950				16.51	0.69
	+19 33 24.2445527	+19 56 55.01051	23.29 mas	4.07 mas	55.370571	0.185452		62	IRAS 19312+1950				16.51	0.69
	+19 33 24.244556	+19 56 55.0105	23.34 mas	4.06 mas	55.370571	0.185452		63	IRAS 19312+1950				16.09	0.93
	+19 33 24.2443087	+19 56 55.01103	19.63 mas	4.59 mas	55.370571	0.185453		64	IRAS 19312+1950				17.35	1.89	2009 February 14
	+19 33 24.2443133	+19 56 55.01092	19.7 mas	4.48 mas	55.370571	0.185453		65	IRAS 19312+1950				16.93	2.79
	+19 33 24.2442633	+19 56 55.00942	18.95 mas	2.98 mas	55.370570	0.185453		66	IRAS 19312+1950				16.93	2.04	2009 May 8
	+19 33 24.244474	+19 56 55.00911	22.11 mas	2.67 mas	55.370570	0.185452		67	IRAS 19312+1950				16.51	1.42
	+19 33 24.24424	+19 56 55.00889	18.6 mas	2.45 mas	55.370570	0.185453		68	IRAS 19312+1950				17.35	1.35	2009 June 11
	+19 33 24.2442587	+19 56 55.00886	18.88 mas	2.42 mas	55.370570	0.185453		69	IRAS 19312+1950				16.93	1.45
	+19 33 24.244226	+19 56 55.00823	18.39 mas	1.79 mas	55.370570	0.185453		70	IRAS 19312+1950				16.93	1.09	2009 August 29

DSS colored	2MASS colored	WISE colored
PACS color (70-160 um)	SPIRE color (250-500 um)	GLIMPSE 360
SDSS color	IRAC color I1,I2,I4	NVSS (1.4GHz)
ATLASGAL 870 um	ATLASGAL 870 um + Planck	Bolocam 1.1 mm
UKIDSS K Download UKIDSS K FITS	2MASS K Download 2MASS K FITS

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 'IMA11B' 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 'IMA11B' AND detected=true AND hide=false ORDER BY detected DESC,id

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IMA11B - Annual Parallax Distance and Kinematical Property of H2O Masers in IRAS 19312+1950

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Detection table from Imai et al. (2011b)

IMA11B - Annual Parallax Distance and Kinematical Property of H₂O Masers in IRAS 19312+1950