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DEG07A - Identification of Very Red Counterparts of SiO Maser and OH/IR Objects in the GLIMPSE Survey

Short title: Deguchi et al. (2007A)
Authors: Deguchi, Shuji Nakashima, Jun-ichi Kwok, Sun Koning, Nicolas
Journal: The Astrophysical Journal, Volume 664, Issue 2, pp. 1130-1143.
Bibcode:

Non-detection table: Show non-detection table
Detection table: Show detection table (2 detection) Non-detection table: Show non-detection table (19 non-detection)
Target type: star

Abstract
Using the 3.6, 4.5, 5.8, and 8.0 mum images with 1.2 arcsec pixel resolution of the Spitzer/GLIMPSE survey, we investigated 23 masing and 18 very red objects, which are extremely faint in the near-infrared bands. We found the counterparts for all of the selected objects on the GLIMPSE images. Color indices in these IR bands suggest the presence of a high-extinction layer of more than a few tenths of a solar mass in front of the central star. Furthermore, radio observations in the SiO and H₂O maser lines found characteristic maser-line spectra of the embedded objects, e.g., the SiO J=1-0 line intensity in the v=2 state is stronger than that of the v=1 state, or very widespread H₂O maser emission spectra. These facts indicate that these objects are really enshrouded by very thick circumstellar matter, some of which cannot be ascribed to the AGB wind of the central star. Individually interesting objects are discussed, including two newly found water fountains and an SiO source accompanying a nebulosity.	Target sources: IRAS

Abstract

Using the 3.6, 4.5, 5.8, and 8.0 mum images with 1.2 arcsec pixel resolution of the Spitzer/GLIMPSE survey, we investigated 23 masing and 18 very red objects, which are extremely faint in the near-infrared bands. We found the counterparts for all of the selected objects on the GLIMPSE images. Color indices in these IR bands suggest the presence of a high-extinction layer of more than a few tenths of a solar mass in front of the central star. Furthermore, radio observations in the SiO and H₂O maser lines found characteristic maser-line spectra of the embedded objects, e.g., the SiO J=1-0 line intensity in the v=2 state is stronger than that of the v=1 state, or very widespread H₂O maser emission spectra. These facts indicate that these objects are really enshrouded by very thick circumstellar matter, some of which cannot be ascribed to the AGB wind of the central star. Individually interesting objects are discussed, including two newly found water fountains and an SiO source accompanying a nebulosity.

Target sources:
IRAS

Input tables: Table 1, 3 and 4
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Detection table from Deguchi et al. (2007A)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	V_peak	F_peak	∫F dv	RMS	List	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			H₂O	(km/s)	(Jy)	(Jy*km/s)	(Jy)		Yes/No		(kpc)
1	18 31 22.9	-09 57 20	21.7971	-0.1271	G21.797-0.127	IRAS 18286-0959	22 GHz;	-14.7	10.816	3576.997	0.120	ENG_H2O	+H₂O +OH -SiO	SFR_MIXED		DEG07A
2	18 48 43	-01 48 30	31.0124	-0.2193	G31.012-0.219	IRAS 18460-0151	22 GHz;	117.0	13.667	524.397	0.140	ENG_H2O	+H₂O -CH₃OH II +OH -SiO	SFR_MIXED		DEG07A

Non-detection table from Deguchi et al. (2007A)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	F_peak	Date	RMS	List	Detection	Class	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			H₂O	(Jy)		(Jy)		Yes/No
1	19 02 6.3	+03 20 16	37.1185	-0.8474	G37.118-0.847	IRAS 18596+0315	22 GHz;	0.723	2006-04-20	0.241	ENG_H2O	+H₂O -CH₃OH I -CH₃OH II +OH +SiO	EVOLVED	DEG07A
2	18 13 3.1	-19 14 19	11.5216	-0.5824	G11.522-0.582	IRAS 18100-1915	22 GHz;	0.915	2006-04-20	0.305	ENG_H2O	-H₂O +OH +SiO	EVOLVED	DEG07A
3	18 19 1.7	-17 12 07	13.9885	-0.8610	G13.988-0.861	IRAS 18161-1713	22 GHz;	0.9	2006-04-20	0.300	ENG_H2O	-H₂O -OH -SiO	EVOLVED	DEG07A
4	18 24 5.3	-12 26 12	18.7688	0.3018	G18.769+0.302	IRAS 18212-1227	22 GHz;	0.723	2006-04-20	0.241	ENG_H2O	-H₂O -CH₃OH II +OH -SiO	EVOLVED	DEG07A
5	18 32 37	-09 02 30	22.7483	0.0252	G22.749+0.025	IRAS 18298-0904	22 GHz;	0.63	2006-04-20	0.210	ENG_H2O	-H₂O -CH₃OH II -SiO	EVOLVED	DEG07A
6	18 45 4.9	-05 06 28	27.6624	-0.9176	G27.662-0.916	IRAS 18424-0509	22 GHz;	0.738	2006-04-20	0.246	ENG_H2O	-H₂O -SiO	EVOLVED	DEG07A
7	18 47 5.2	-03 56 21	28.9304	-0.8290	G28.930-0.829	IRAS 18444-0359	22 GHz;	0.948	2006-04-20	0.316	ENG_H2O	-H₂O -SiO	EVOLVED	DEG07A
8	19 03 33.1	+06 42 29	40.2795	0.3762	G40.279+0.376	IRAS 19011+0638	22 GHz;	0.705	2006-04-20	0.235	ENG_H2O	-H₂O -CH₃OH II -OH -SiO	EVOLVED	DEG07A
9	19 11 10	+10 11 37	44.2405	0.3087	G44.241+0.309	IRAS 19087+1006	22 GHz;	0.672	2006-04-20	0.224	ENG_H2O	-H₂O -CH₃OH II -OH -SiO	SFR	DEG07A
10	19 13 49.4	+09 25 51	43.8677	-0.6247	G43.868-0.625	IRAS 19114+0920	22 GHz;	1.269	2006-04-20	0.423	ENG_H2O	-H₂O -OH -SiO	EVOLVED	DEG07A
11	19 13 37.4	+12 25 39	46.4994	0.8094	G46.495+0.812	IRAS 19112+1220	22 GHz;	0.69	2006-04-20	0.230	ENG_H2O	-H₂O -CH₃OH II +OH -SiO	EVOLVED	DEG07A
12	18 17 01	-16 37 00	14.2758	-0.1599	G14.276-0.160	G014.2758-00.1602	22 GHz;	0.831	2006-04-20	0.277	ENG_H2O	-H₂O -SiO	EVOLVED	DEG07A
13	18 35 24.3	-06 42 59	25.1301	0.4844	G25.130+0.484	IRAS 18327-0645	22 GHz;	0.738	2006-04-20	0.246	ENG_H2O	-H₂O -SiO	EVOLVED	DEG07A
14	18 42 30.9	-04 34 35	27.8429	-0.1060	G27.843-0.106	G027.8433-00.1060	22 GHz;	0.522	2006-04-20	0.174	ENG_H2O	-H₂O -SiO	UNK	DEG07A
15	18 43 25.8	-03 55 55	28.5204	-0.0143	G28.520-0.014	IRAS 18407-0358	22 GHz;	0.732	2006-04-20	0.244	ENG_H2O	-H₂O +OH +SiO	SFR_MIXED	DEG07A
16	18 06 25.3	-18 57 44	11.0061	0.9222	G11.006+0.922	IRAS 18034-1858	22 GHz;	0.807	2006-04-20	0.269	ENG_H2O	-H₂O -SiO	EVOLVED	DEG07A
17	18 35 19.1	-07 19 23	24.5815	0.2243	G24.581+0.224	IRAS 18325-0721	22 GHz;	0.732	2006-04-20	0.244	ENG_H2O	-H₂O +OH -SiO	EVOLVED	DEG07A
18	19 29 46.5	+17 09 01	52.5040	-0.4087	G52.504-0.409	IRAS 19275+1702	22 GHz;	0.78	2006-04-20	0.260	ENG_H2O	-H₂O -SiO	EVOLVED	DEG07A
19	19 05 14.4	+05 21 51	39.2779	-0.6132	G39.278-0.613	IRAS 19027+0517	22 GHz;	0.636	2006-04-20	0.212	ENG_H2O	-H₂O +OH	EVOLVED	DEG07A

Distribution of sources in all sky (l,b)

Distribution of sources in all sky using Aladin

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Distribution of sources in IRAS color-color diagram

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Original color diagram is taken form van der Veen & Habing (1987)

Type	Description
I	Oxygen-rich non-variable stars without circumstellar shells
II	Variable stars with "young" O-rich circumstellar shells
IIIa	Variable stars with more evolved O-rich circumstellar shells
IIIb	Variable stars with thick O-rich circumstellar shells
IV	Variable stars with very thick O-rich circumstellar shells
V	Planetary nebulae and non- variable stars with very cool circumstellar shells
VIa	Variable stars with relatively cold dust at large distances; a significant part of the stars is carbon-rich
VIb	Variable stars with relatively hot dust close to the star and relatively cold dust at large distances; Some of the objects have proven to be O-rich
VII	Variable stars with more evolved C-rich circumstellar shells
VIII	Different sort of objects

Distribution of the detection velocities versus galactic longitude from DEG07A

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