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LAN92 - High-velocity OH/IR stars at the Galactic centre

Short title: van Langevelde et al. (1992)
Authors: van Langevelde, H. J. Brown, A. G. A. Lindqvist, M. Habing, H. J. de Zeeuw, P. T.
Journal: Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 1, p. L17-L20.
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Abstract
We present the results of a small survey for OH/IR stars at high radial velocities in the Galactic center region performed with the VLA and the Nancay telescope. We have detected two new OH/IR stars, one at a peculiar velocity of -309 km/s, the other at -355 km/s. These two objects and one previously detected high-velocity OH/IR star (OH 0.3-0.2, Baud et al., 1975) stand out in the 1, v diagram of OH/IR stars at the Galactic center. Are these stars just on the extreme edge of the radial velocity distribution? Or are these objects no longer bound to the Galactic center? We discuss these possibilities, showing that these are most likely bulge stars on elongated orbits passing close to the Galactic center.	Comments: Velocity resolution: 1.20 km/s

Abstract

We present the results of a small survey for OH/IR stars at high radial velocities in the Galactic center region performed with the VLA and the Nancay telescope. We have detected two new OH/IR stars, one at a peculiar velocity of -309 km/s, the other at -355 km/s. These two objects and one previously detected high-velocity OH/IR star (OH 0.3-0.2, Baud et al., 1975) stand out in the 1, v diagram of OH/IR stars at the Galactic center. Are these stars just on the extreme edge of the radial velocity distribution? Or are these objects no longer bound to the Galactic center? We discuss these possibilities, showing that these are most likely bulge stars on elongated orbits passing close to the Galactic center.

Comments:
Velocity resolution: 1.20 km/s

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Detection table from van Langevelde et al. (1992)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	Frequency	V_range	V_peak	F_peak	List	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			OH	(MHz)	(km/s)	(km/s)	(Jy)		Yes/No		(kpc)
1	17 44 45.7	-29 00 44.8	359.8371	0.1202	G359.8374+0.1202	OH359.837+0.120	1612 MHz;	1612	38.0	-374.0	0.170	ENG15	+H₂O +OH	EVOLVED		LAN92
2	17 45 38.5	-29 02 5.7	359.9182	-0.0556	G359.9184-0.0551	OH359.918-0.056	1612 MHz;	1612	38.0	-328.0	0.780	ENG15	+OH +SiO	SFR_MIXED		LAN92

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 LAN92

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