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PAY88 - A young planetary nebula with OH molecules - NGC 6302

Short title: Payne et al. (1988)
Authors: Payne, H. E. Phillips, J. A. Terzian, Yervant
Journal: Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 326, March 1, 1988, p. 368-375. Research supported by Cornell University.
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Abstract
The results of a sensitive survey of planetary nebulae in all four ground-state OH lines are reported. The results confirm that evolved planetary nebulas are not OH sources in general. However, one interesting object was not detected: an OH 1612 MHz maser in the young planetary nebula NGC 6302. This nebula may be in a brief evolutionary stage, similar to the young and compact planetary nebula Vy 2-2, where OH has already been detected. In addition, the results of further observations of NGC 6302 are reported, including VLA observations of the 1612 MHz line and continuum emission and detections of rotationally excited OH lines at 5-cm wavelength in absorption.

Abstract

The results of a sensitive survey of planetary nebulae in all four ground-state OH lines are reported. The results confirm that evolved planetary nebulas are not OH sources in general. However, one interesting object was not detected: an OH 1612 MHz maser in the young planetary nebula NGC 6302. This nebula may be in a brief evolutionary stage, similar to the young and compact planetary nebula Vy 2-2, where OH has already been detected. In addition, the results of further observations of NGC 6302 are reported, including VLA observations of the 1612 MHz line and continuum emission and detections of rotationally excited OH lines at 5-cm wavelength in absorption.

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Detection table from Payne et al. (1988)

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ID	Obs. RA	Obs. Dec	l	b	Group id	grpv	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 13 44.4	-37 06 15.1	349.5080	1.0555	G349.509+1.055	G349.5093+1.0555	NGC 6302	1667 MHz;	1667	9.2	-54.4	0.090	ENG15	-H₂O -CH₃OH II +OH	UNK		PAY88
2	19 24 21.8	+09 53 55.7	45.4972	-2.7018	G45.497-2.702	G45.4971-2.7023	VY 2-2	1612 MHz;	1612	62.0	-62.0	4.640	ENG15	-H₂O +OH	UNK		PAY88
3	17 13 44.4	-37 06 15.1	349.5080	1.0555	G349.509+1.055	G349.5093+1.0555	NGC 6302	1612 MHz;	1612	10.8	-51.3	0.140	ENG15	-H₂O -CH₃OH II +OH	UNK		PAY88

Non-detection table from Payne et al. (1988)