High-resolution near-infrared and millimeter-wave spectroscopy of NGC 7027

Journal Article · Sat Jan 15 04:00:00 EST 1983 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/160630· OSTI ID:6035251

Thronson, Jr, H A

The compact planetary nebula NGC 7027 has been observed at high spectral resolution at near-infrared and millimeter wavelengths. In the near-infrared, the line profiles of H Brackett ..gamma.., He ii 10--4, He i 2/sup 1/P--2/sup 1/S are presented and discussed. The widths and intensities of the three lines are generally in agreement with visual and radio recombination line observations. New J = 1..-->..0 /sup 12/CO and /sup 13/CO millimeter-wave observations are also presented. While /sup 12/CO was readily detected, /sup 13/CO emission at a level reported previously for NGC 7027 could not be confirmed. A peak antena temperature of T(/sub A/ = 0.035 +- 0.007 K was found for /sup 13/CO. An isotope ratio of (/sup 12/C)/(/sup 13/C)> or =36 +- 6 is derived for the planetary. On the basis of this value, it is suggested that NGC 7027 evolved from a 3 M/sub sun/ star that passed through at least the asymptotic giant branch stage.

• OSTI ID: 6035251
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 264:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON 12
CARBON 13
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
EMISSION
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
INFRARED SPECTRA
INTERSTELLAR GRAINS
ISOTOPE RATIO
ISOTOPES
LIGHT NUCLEI
LINE WIDTHS
NEBULAE
NUCLEI
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PLANETARY NEBULAE
SPECTRA
SPECTROSCOPY
STABLE ISOTOPES