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NAK06 - SiO Masers in a Scutum Massive Star Cluster of Red Supergiants

Short title: Nakashima & Deguchi (2006)
Authors: Nakashima, Jun-ichi Deguchi, Shuji
Journal: The Astrophysical Journal, Volume 647, Issue 2, pp. L139-L142.
Bibcode:

Non-detection table: Show non-detection table
Detection table: Show detection table (7 detection) Non-detection table: Show non-detection table (23 non-detection)

Abstract
We have detected five objects toward a Scutum massive star cluster of red supergiants in the SiO J=1-0, v=1 or v=2 transitions. The radial velocity data indicate that four of the detections are cluster members and that the other, which is located close to the X-ray source AX 1838-0655, is a foreground object. The high velocity resolution of the maser lines provides a more accurate determination of the radial velocity (120 km s^-1) and velocity dispersion (~2 km s^-1) of the cluster and, hence, of the distance (6.5 kpc) and luminosities of the stars. We discuss the implications of these measurements in constraining the relationships between SiO masers and mass-loss rate and modeling the cluster age and mass.	Target sources: 2MASS

Abstract

We have detected five objects toward a Scutum massive star cluster of red supergiants in the SiO J=1-0, v=1 or v=2 transitions. The radial velocity data indicate that four of the detections are cluster members and that the other, which is located close to the X-ray source AX 1838-0655, is a foreground object. The high velocity resolution of the maser lines provides a more accurate determination of the radial velocity (120 km s^-1) and velocity dispersion (~2 km s^-1) of the cluster and, hence, of the distance (6.5 kpc) and luminosities of the stars. We discuss the implications of these measurements in constraining the relationships between SiO masers and mass-loss rate and modeling the cluster age and mass.

Target sources:
2MASS

Input tables: Table 1
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Detection table from Nakashima & Deguchi (2006)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Other name	Spectra	Line	V_range	V_peak	T_a	∫T_a dv	Telescope	RMS	Detection	Class	Dist. (parallax)
	(J2000)	(J2000)	(deg.)	(deg.)					SiO	(km/s)	(km/s)	(K)	(K*km/s)		(Jy)	Yes/No		(kpc)
1	18 37 56.3	-06 52 32.2	25.2777	-0.1474	G25.279-0.153	F01	J18375629-0652322	Spectra	SiO J=1-0 v=1;	11.7*	115.0	0.316	2.11	NRO	0.076	-H₂O +OH +SiO	EVOLVED
2	18 37 55.3	-06 52 48.4	25.2717	-0.1457	G25.279-0.153	F02	J18375528-0652484	Spectra	SiO J=1-0 v=1;	6.6*	120.0	0.394	2.518	NRO	0.070	-H₂O +OH +SiO	EVOLVED
3	18 37 50.9	-06 53 38.2	25.2511	-0.1359	G25.254-0.124	F04	J18375090-0653382	Spectra	SiO J=1-0 v=1;	6.0*	121.5	0.336	1.387	NRO	0.057	-OH +SiO	EVOLVED
4	18 37 58.9	-06 52 32.1	25.2826	-0.1569	G25.279-0.153	F13	J18375890-0652321	Spectra	SiO J=1-0 v=1;	14.1*	116.5	0.493	3.242	NRO	0.061	-H₂O +OH +SiO	EVOLVED
5	18 37 58.9	-06 52 32.1	25.2826	-0.1569	G25.279-0.153	F13	J18375890-0652321	Spectra	SiO J=1-0 v=2;	4.2*	116.4	0.486	2.082	NRO	0.056	-H₂O +OH +SiO	EVOLVED
6	18 38 1.6	-06 55 23.6	25.2455	-0.1888	G25.245-0.189	X18	J18380162-0655235		SiO J=1-0 v=1;		74.3	0.554	3.405	NRO	0.078	+SiO	EVOLVED
7	18 38 1.6	-06 55 23.6	25.2455	-0.1888	G25.245-0.189	X18	J18380162-0655235		SiO J=1-0 v=2;		74.3	0.771	3.765	NRO	0.080	+SiO	EVOLVED

Non-detection table from Nakashima & Deguchi (2006)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Other name	Line	V_range	T_a	∫T_a dv	Date	End date	Telescope	RMS	Detection	Class
	(J2000)	(J2000)	(deg.)	(deg.)				SiO	(km/s)	(K)	(K*km/s)				(Jy)	Yes/No
1	18 37 56.3	-06 52 32.2	25.2777	-0.1474	G25.279-0.153	F01	J18375629-0652322	SiO J=1-0 v=2;				2006-02-16	2006-02-19	NRO	0.074	-H₂O +OH +SiO	EVOLVED
2	18 37 55.3	-06 52 48.4	25.2717	-0.1457	G25.279-0.153	F02	J18375528-0652484	SiO J=1-0 v=2;				2006-02-16	2006-02-19	NRO	0.070	-H₂O +OH +SiO	EVOLVED
3	18 37 59.7	-06 53 49.4	25.2651	-0.1698	G25.279-0.153	F03	J18375973-0653494	SiO J=1-0 v=1;				2006-02-16	2006-02-19	NRO	0.058	-H₂O +OH +SiO	EVOLVED
4	18 37 59.7	-06 53 49.4	25.2651	-0.1698	G25.279-0.153	F03	J18375973-0653494	SiO J=1-0 v=2;				2006-02-16	2006-02-19	NRO	0.059	-H₂O +OH +SiO	EVOLVED
5	18 37 50.9	-06 53 38.2	25.2511	-0.1359	G25.254-0.124	F04	J18375090-0653382	SiO J=1-0 v=2;				2006-02-16	2006-02-19	NRO	0.061	-OH +SiO	EVOLVED
6	18 37 55.5	-06 52 12.3	25.2811	-0.1419	G25.279-0.153	F05	J18375550-0652122	SiO J=1-0 v=1;				2006-02-16	2006-02-19	NRO	0.057	-H₂O +OH +SiO	EVOLVED
7	18 37 55.5	-06 52 12.3	25.2811	-0.1419	G25.279-0.153	F05	J18375550-0652122	SiO J=1-0 v=2;				2006-02-16	2006-02-19	NRO	0.062	-H₂O +OH +SiO	EVOLVED
8	18 37 57.5	-06 53 25.4	25.2667	-0.1584	G25.279-0.153	F06	J18375745-0653253	SiO J=1-0 v=1;				2006-02-16	2006-02-19	NRO	0.055	-H₂O +OH +SiO	EVOLVED
9	18 37 57.5	-06 53 25.4	25.2667	-0.1584	G25.279-0.153	F06	J18375745-0653253	SiO J=1-0 v=2;				2006-02-16	2006-02-19	NRO	0.058	-H₂O +OH +SiO	EVOLVED
10	18 37 54.3	-06 52 34.7	25.2733	-0.1404	G25.279-0.153	F07	J18375430-0652347	SiO J=1-0 v=1;				2006-02-16	2006-02-19	NRO	0.068	-H₂O +OH +SiO	EVOLVED
11	18 37 54.3	-06 52 34.7	25.2733	-0.1404	G25.279-0.153	F07	J18375430-0652347	SiO J=1-0 v=2;				2006-02-16	2006-02-19	NRO	0.070	-H₂O +OH +SiO	EVOLVED
12	18 37 57.8	-06 52 22.3	25.2829	-0.1515	G25.279-0.153	F09	J18375777-0652222	SiO J=1-0 v=1;	4.6*	0.379*	1.05*	2006-02-16	2006-02-19	NRO	0.060	-H₂O +OH +SiO	EVOLVED
13	18 37 57.8	-06 52 22.3	25.2829	-0.1515	G25.279-0.153	F09	J18375777-0652222	SiO J=1-0 v=2;	2.2*	0.326*	0.35*	2006-02-16	2006-02-19	NRO	0.059	-H₂O +OH +SiO	EVOLVED
14	18 37 59.5	-06 53 32	25.2690	-0.1668	G25.279-0.153	F10	J18375952-0653319	SiO J=1-0 v=1;				2006-02-16	2006-02-19	NRO	0.057	-H₂O +OH +SiO	EVOLVED
15	18 37 59.5	-06 53 32	25.2690	-0.1668	G25.279-0.153	F10	J18375952-0653319	SiO J=1-0 v=2;				2006-02-16	2006-02-19	NRO	0.059	-H₂O +OH +SiO	EVOLVED
16	18 37 51.7	-06 51 49.9	25.2794	-0.1251	G25.279-0.153	F11	J18375172-0651499	SiO J=1-0 v=1;				2006-02-16	2006-02-19	NRO	0.071	-H₂O +OH +SiO	EVOLVED
17	18 37 51.7	-06 51 49.9	25.2794	-0.1251	G25.279-0.153	F11	J18375172-0651499	SiO J=1-0 v=2;				2006-02-16	2006-02-19	NRO	0.070	-H₂O +OH +SiO	EVOLVED
18	18 38 3.3	-06 52 45.1	25.2878	-0.1747	G25.279-0.153	F12	J18380330-0652451	SiO J=1-0 v=1;				2006-02-16	2006-02-19	NRO	0.069	-H₂O +OH +SiO	EVOLVED
19	18 38 3.3	-06 52 45.1	25.2878	-0.1747	G25.279-0.153	F12	J18380330-0652451	SiO J=1-0 v=2;				2006-02-16	2006-02-19	NRO	0.069	-H₂O +OH +SiO	EVOLVED
20	18 37 47.6	-06 53 2.4	25.2538	-0.1194	G25.254-0.124	F14	J18374764-0653023	SiO J=1-0 v=1;				2006-02-16	2006-02-19	NRO	0.058	-OH +SiO	EVOLVED
21	18 37 47.6	-06 53 2.4	25.2538	-0.1194	G25.254-0.124	F14	J18374764-0653023	SiO J=1-0 v=2;				2006-02-16	2006-02-19	NRO	0.058	-OH +SiO	EVOLVED
22	18 38 1.3	-06 52 52	25.2823	-0.1682	G25.279-0.153	F16	J18380129-0652519	SiO J=1-0 v=1;				2006-02-16	2006-02-19	NRO	0.062	-H₂O +OH +SiO	EVOLVED
23	18 38 1.3	-06 52 52	25.2823	-0.1682	G25.279-0.153	F16	J18380129-0652519	SiO J=1-0 v=2;				2006-02-16	2006-02-19	NRO	0.061	-H₂O +OH +SiO	EVOLVED

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 NAK06

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