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CHO95 - Detection of the (29)SiO V = 1, J = 1-0 maser from TX Camelopardalis

Short title: Cho & Ukita (1995)
Authors: Cho, Se-Hyung Ukita, Nobuharu
Journal: PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 47, no. 1, p. L1-L4
Bibcode:

Non-detection table: Show non-detection table
Detection table: Show detection table (7 detection) Non-detection table: Show non-detection table (1 non-detection)

Abstract
The maser emission from the v = 1, J = 1-0 transition of (29)SiO has been detected for the first time toward the Mira variable star TX Cam among 54 surveyed late-type stars. The line was fairly narrower than the (29)SiO v = 0, J = 1-0 transition, and slightly redshifted compared to the v = 0 line. In addition, the (28)SiO v = 2, J = 2-1 transition has also been newly detected in this star. Based on the line intensity, the pumping mechanism for the (29)SiO v = 1, J = 1-0 maser is discussed. The simple large velocity-gradient model and the line overlap of H2O can not be adopted for this maser.

Abstract

The maser emission from the v = 1, J = 1-0 transition of (29)SiO has been detected for the first time toward the Mira variable star TX Cam among 54 surveyed late-type stars. The line was fairly narrower than the (29)SiO v = 0, J = 1-0 transition, and slightly redshifted compared to the v = 0 line. In addition, the (28)SiO v = 2, J = 2-1 transition has also been newly detected in this star. Based on the line intensity, the pumping mechanism for the (29)SiO v = 1, J = 1-0 maser is discussed. The simple large velocity-gradient model and the line overlap of H2O can not be adopted for this maser.

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Detection table from Cho & Ukita (1995)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	V_peak	T_a	∫T_a dv	Telescope	RMS	List	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			SiO	(km/s)	(K)	(K*km/s)		(Jy)		Yes/No		(kpc)
1	05 00 51.1	+56 10 54	152.8381	8.5685	G152.837+8.569	IRAS04566+5606 npl	29SiO J=1-0 v=1;	9.2	3.2	2.5	NRO	0.050	NRO	-H₂O -OH +SiO	EVOLVED		CHO95
2	05 00 51.1	+56 10 54	152.8381	8.5685	G152.837+8.569	IRAS04566+5606 npl	29SiO J=1-0 v=0;	8.9	15.7	25.9	NRO	0.040	NRO	-H₂O -OH +SiO	EVOLVED		CHO95
3	05 00 51.1	+56 10 54	152.8381	8.5685	G152.837+8.569	IRAS04566+5606 npl	29SiO J=2-1 v=0;	5.4	0.3	2	NRO	0.050	NRO	-H₂O -OH +SiO	EVOLVED		CHO95
4	05 00 51.1	+56 10 54	152.8381	8.5685	G152.837+8.569	IRAS04566+5606 npl	SiO J=1-0 v=2;	10.8	27.2	145.9	NRO	0.040	NRO	-H₂O -OH +SiO	EVOLVED		CHO95
5	05 00 51.1	+56 10 54	152.8381	8.5685	G152.837+8.569	IRAS04566+5606 npl	SiO J=2-1 v=2;	9.2	3.1	2	NRO	0.060	NRO	-H₂O -OH +SiO	EVOLVED		CHO95
	05 00 51.1	+56 10 54	152.8381	8.5685	G152.837+8.569	IRAS04566+5606 npl	SiO J=2-1 v=2;	5.6	2.1	1.5	NRO	0.060	NRO	-H₂O -OH +SiO	EVOLVED		CHO95
7	05 00 51.1	+56 10 54	152.8381	8.5685	G152.837+8.569	IRAS04566+5606 npl	SiO J=2-1 v=1;	8.9	9.9	29.9	NRO	0.090	NRO	-H₂O -OH +SiO	EVOLVED		CHO95

Non-detection table from Cho & Ukita (1995)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	T_a	Date	Telescope	RMS	List	Detection	Class	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			SiO	(K)			(Jy)		Yes/No
1	05 00 51.1	+56 10 54	152.8381	8.5685	G152.837+8.569	IRAS04566+5606 npl	SiO J=1-0 v=3;	< 0.1	1994-03-27	NRO	0.030	NRO	-H₂O -OH +SiO	EVOLVED	CHO95

Distribution of sources in all sky (l,b)

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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 CHO95

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