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DEG05A - Detection of SiO Maser Emission in V838 Mon

Short title: Deguchi et al. (2005A)
Authors: Deguchi, Shuji Matsunaga, Noriyuki Fukushi, Hinako
Journal: Publications of the Astronomical Society of Japan, Vol.57, No.5, pp. L25-L28
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Abstract
We report on the detection of 43GHz SiO maser emission in V838 Mon, a prototype of a new class of eruptive variables, in which a red supergiant was formed after a nova-like eruption in 2002. The detection of SiO masers indicates that the star formed after the eruption is indeed a kind of cool mass-losing object with circumstellar masers. The measured radial velocity and the intensity of maser emission are consistent with the object being located at a distance of about 7kpc from the sun. It also suggests that a considerable percentage of SiO masing objects in the Galaxy are formed by the same mechanism as that which created V838 Mon. eprintid: arXiv:astro-ph/0507363

Abstract

We report on the detection of 43GHz SiO maser emission in V838 Mon, a prototype of a new class of eruptive variables, in which a red supergiant was formed after a nova-like eruption in 2002. The detection of SiO masers indicates that the star formed after the eruption is indeed a kind of cool mass-losing object with circumstellar masers. The measured radial velocity and the intensity of maser emission are consistent with the object being located at a distance of about 7kpc from the sun. It also suggests that a considerable percentage of SiO masing objects in the Galaxy are formed by the same mechanism as that which created V838 Mon. eprintid: arXiv:astro-ph/0507363

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Detection table from Deguchi et al. (2005A)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Spectra	Line	V_peak	T_a	∫T_a dv	Telescope	RMS	Detection	Class	Dist. (parallax)
	(J2000)	(J2000)	(deg.)	(deg.)				SiO	(km/s)	(K)	(K*km/s)		(Jy)	Yes/No		(kpc)
1	07 04 4.8	-03 50 51.1	217.7975	1.0522	G217.798+1.052	V838 Mon	Spectra	SiO J=1-0 v=1;	54.6	0.197	0.577	NRO	0.034	+SiO	UNK
2	07 04 4.8	-03 50 51.1	217.7975	1.0522	G217.798+1.052	V838 Mon	Spectra	SiO J=1-0 v=2;	54.2	0.251	0.396	NRO	0.042	+SiO	UNK
3	07 04 4.8	-03 50 51.1	217.7975	1.0522	G217.798+1.052	V838 Mon	Spectra	SiO J=1-0 v=1;	53.5	0.33	0.813	NRO	0.070	+SiO	UNK
4	07 04 4.8	-03 50 51.1	217.7975	1.0522	G217.798+1.052	V838 Mon	Spectra	SiO J=1-0 v=2;	54.1	0.419	0.681	NRO	0.065	+SiO	UNK

Non-detection table from Deguchi et al. (2005A)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	Date	Telescope	RMS	Detection	Class
	(J2000)	(J2000)	(deg.)	(deg.)			SiO			(Jy)	Yes/No
1	07 04 4.8	-03 50 51.1	217.7975	1.0522	G217.798+1.052	V838 Mon	SiO J=2-1 v=1;	2005-04-24	NRO	0.034	+SiO	UNK
2	18 50 36.7	-21 23 29.6	13.6277	-9.4001	G13.628-9.400	V4332 Sgr	SiO J=1-0 v=1;	2005-03-10	NRO	0.052	-CH₃OH II -SiO	EVOLVED
3	18 50 36.7	-21 23 29.6	13.6277	-9.4001	G13.628-9.400	V4332 Sgr	SiO J=1-0 v=2;	2005-03-10	NRO	0.068	-CH₃OH II -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 DEG05A

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