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DEG04C - Study of the Bipolar Nebula IRAS 19312+1950. II. Circumstellar Chemistry

Short title: Deguchi et al. (2004)
Authors: Deguchi, Shuji Nakashima, Jun-Ichi Takano, Shuro
Journal: Publications of the Astronomical Society of Japan, Vol.56, No.6, pp. 1083-1098
Bibcode:

Target type: pAGB_PN

Abstract
The bipolar nebula IRAS 19312+1950 is a unique SiO maser source exhibiting both properties of young and evolved objects. To clarify the nature of this object, we made molecular line observations with the Nobeyama 45-m radio telescope. We detected emission from O-bearing (HCO⁺, SiO, SO, and SO₂), C- and N-bearing molecules (CN, CS, HCN, HNC, NH₃, N₂H⁺, HC₃N, H₂CS, and CH₃OH), and their isotopic species (C¹⁷O, ¹³C¹⁸O, and C³⁴S). The line profiles consist of weak broad (Delta v &tilde 30 km s^-1) and/or strong narrow (Delta v lesssim 5 km s^-1) components, depending on the molecular species. Strong time variations of H₂O and SiO masers were also observed. Numerical modeling of the envelope with the LVG-code resulted in a good fit of the model with a mass loss rate of 2.6 � 10^-4 Modot yr^-1 to the observed intensities for the broad-component lines. On the other hand, non-O-bearing molecules, which only have narrow profiles, were found to have abundances typical of those in cool dust clouds. No isotopic enrichment was found, indicating little evidence of the narrow cool component being ejecta of the central AGB star or a possible companion. These facts compelled us to conclude that IRAS 19312+1950 is an exotic mass-losing evolved star embedded in a low-mass (&tilde M_odot) dark cloud. eprintid: arXiv:astro-ph/0410252	Target sources: IRAS Comments: Velocity resolution: 0.6 km/s A mean conversion factor 2.8 Jy/K was used (Deguchi et al. 2007).

Abstract

The bipolar nebula IRAS 19312+1950 is a unique SiO maser source exhibiting both properties of young and evolved objects. To clarify the nature of this object, we made molecular line observations with the Nobeyama 45-m radio telescope. We detected emission from O-bearing (HCO⁺, SiO, SO, and SO₂), C- and N-bearing molecules (CN, CS, HCN, HNC, NH₃, N₂H⁺, HC₃N, H₂CS, and CH₃OH), and their isotopic species (C¹⁷O, ¹³C¹⁸O, and C³⁴S). The line profiles consist of weak broad (Delta v &tilde 30 km s^-1) and/or strong narrow (Delta v lesssim 5 km s^-1) components, depending on the molecular species. Strong time variations of H₂O and SiO masers were also observed. Numerical modeling of the envelope with the LVG-code resulted in a good fit of the model with a mass loss rate of 2.6 � 10^-4 Modot yr^-1 to the observed intensities for the broad-component lines. On the other hand, non-O-bearing molecules, which only have narrow profiles, were found to have abundances typical of those in cool dust clouds. No isotopic enrichment was found, indicating little evidence of the narrow cool component being ejecta of the central AGB star or a possible companion. These facts compelled us to conclude that IRAS 19312+1950 is an exotic mass-losing evolved star embedded in a low-mass (&tilde M_odot) dark cloud.
eprintid: arXiv:astro-ph/0410252

Target sources:
IRAS

Comments:
Velocity resolution: 0.6 km/s
A mean conversion factor 2.8 Jy/K was used (Deguchi et al. 2007).

Input tables: Table 2
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Detection table from Deguchi et al. (2004)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Frequency	V_range	V_peak	List	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			(MHz)	(km/s)	(km/s)		Yes/No		(kpc)
1	19 33 24.3	+19 56 55	55.3707	0.1853	G55.371+0.185	IRAS 19312+1950	1665	45.0	10.0	ENG15	+H₂O +CH₃OH I -CH₃OH II +OH +SiO	SFR_MIXED		DEG04C
	19 33 24.3	+19 56 55	55.3707	0.1853	G55.371+0.185	IRAS 19312+1950	1612	45.0	10.0	ENG15	+H₂O +CH₃OH I -CH₃OH II +OH +SiO	SFR_MIXED		DEG04C
	19 33 24.3	+19 56 55	55.3707	0.1853	G55.371+0.185	IRAS 19312+1950	1667	45.0	10.0	ENG15	+H₂O +CH₃OH I -CH₃OH II +OH +SiO	SFR_MIXED		DEG04C

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(oh_data_all.ra_hms) as ra_hms,MAX(oh_data_all.dec_dms) as dec_dms,MAX(oh_data_all.source_name) as source_name,MAX(oh_data_all.ra) as ra,MAX(oh_data_all.dec) as dec,MAX(oh_data_all.l) as l,MAX(oh_data_all.b) as b,MAX(oh_data_all.grp) as grp,MAX(oh_data_all.other_name) as other_name,MAX(oh_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(oh_data_all.freq) as freq,MAX(oh_data_all.vrange) as vrange,MAX(oh_data_all.vpeak) as vpeak,MAX(oh_data_all.peak) as peak,MAX(oh_data_all.fwhm) as fwhm,MAX(oh_data_all.int) as int,MAX(oh_data_all.rms) as rms,MAX(oh_data_all.units) as units,MAX(oh_data_all.units_rms) as units_rms,MAX(oh_data_all.date_txt) as date_txt,MAX(oh_data_all.telescope_ref) as telescope_ref,MAX(oh_data_all.telescope_conf) as telescope_conf,MAX(oh_data_all.v_step) as v_step,MAX(oh_data_all.beam) as beam,MAX(oh_data_all.beam_maj) as beam_maj,MAX(oh_data_all.beam_min) as beam_min,MAX(oh_data_all.beam_pa) as beam_pa,MAX(oh_data_all.ref) as ref,MAX(oh_data_all.list_ref) as list_ref,MAX(oh_data_all.ascii) as ascii,MAX(oh_data_all.url) as url,MAX(oh_data_all.image) as image,MAX(oh_data_all.image2) as image2,MAX(oh_data_all.image3) as image3,MAX(oh_data_all.descr) as descr,MAX(oh_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(oh_data_all.dist) as dist,1 as dist_parallax,MAX(oh_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 oh_data_all  LEFT JOIN all_objects_withmet ON oh_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 oh_data_all.line=transitions."Line"  WHERE ref ilike 'DEG04C' AND detected=true AND hide=false GROUP BY ref

select oh_data_all.ra_hms,oh_data_all.dec_dms,oh_data_all.source_name,oh_data_all.ra,oh_data_all.dec,oh_data_all.l,oh_data_all.b,oh_data_all.grp,oh_data_all.other_name,oh_data_all.other_desc,oh_data_all.thermal,oh_data_all.freq,oh_data_all.vrange,oh_data_all.vpeak,oh_data_all.peak,oh_data_all.fwhm,oh_data_all.int,oh_data_all.rms,oh_data_all.units,oh_data_all.units_rms,oh_data_all.date_txt,oh_data_all.telescope_ref,oh_data_all.telescope_conf,oh_data_all.v_step,oh_data_all.beam,oh_data_all.beam_maj,oh_data_all.beam_min,oh_data_all.beam_pa,oh_data_all.ref,oh_data_all.list_ref,oh_data_all.ascii,oh_data_all.url,oh_data_all.image,oh_data_all.image2,oh_data_all.image3,oh_data_all.descr,oh_data_all.id,oh_data_all.mjy_flag,oh_data_all.rms_mjy_flag,oh_data_all.dist,oh_data_all.dist_parallax,oh_data_all.date_txt,line_det,type,simbad_types_cat FROM oh_data_all   LEFT JOIN all_objects_withmet ON oh_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 oh_data_all.line=transitions."Line"  WHERE ref ilike 'DEG04C' AND detected=true AND hide=false ORDER BY detected DESC,id

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DEG04C - Study of the Bipolar Nebula IRAS 19312+1950. II. Circumstellar Chemistry

View as list of objects

Detection table from Deguchi et al. (2004)