Search for HeH(+) in NGC 7027

Journal Article · Tue Mar 01 04:00:00 EST 1988 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/166147· OSTI ID:7129301

Moorhead, J M; Lowe, R P; Wehlau, W H; Maillard, J P; Bernath, P F

The 3.3-micron spectrum of the planetary nebula NGC 7027 was searched for the R(0) line of the fundamental vibration-rotation band of the molecular ion HeH(+) without detecting it. The upper limit for detection is 3.7 x 10 to the -14th ergs/sq cm per sec, an improvement in excess of 100 over previous published attempts. This limit is low when compared to expectations based on analysis of molecular processes in gaseous nebulas. Likely causes are incorrect radiative association rates or inadequate representation of the nebular size or of the density distribution in the outer boundary of the nebular model used for the flux prediction. 39 references.

• Research Organization: Western Ontario Univ., London (Canada); CNRS, Institut d'Astrophysique, Paris (France); Arizona Univ., Tucson (USA)
• OSTI ID: 7129301
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 326; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
CHARGED PARTICLES
CHEMICAL COMPOSITION
DETECTION
DOPPLER EFFECT
ELEMENTS
FLUIDS
GASES
HELIUM
HYDRIDES
HYDROGEN COMPOUNDS
INFRARED SPECTRA
IONS
MOLECULAR IONS
NEBULAE
NONMETALS
PLANETARY NEBULAE
RARE GASES
SPECTRA