Spectroscopic observations of the high-ionization planetary nebula NGC 2242 and the H II region K4-45

Journal Article · Fri Jan 01 00:00:00 EST 1988 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/114619· OSTI ID:5294117

Garnett, D R; Dinerstein, H L

New optical spectra of two suspected planetary nebulae, K4-45 and NGC 2242, are presented. It is shown that K4-45 (PK 96 + 1) is a reddened H II region with approximately solar abundances, excited by an early B type star. NGC 2242 (PK 170 + 15) is a planetary nebula of exceptionally high ionization, exhibiting He II, and forbidden Ne V, Ar V, Ne III, and O III emission lines. The lack of He I emission and the presence of strong forbidden Ne V and He II emission indicate an optically thin nebula that is ionized by a central star with an effective temperature greater than 100,000 K. 45 references.

• Research Organization: Texas Univ. (USA); McDonald Observatory, Austin, TX (USA)
• OSTI ID: 5294117
• Journal Information: Astron. J.; (United States), Vol. 95
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
H2 REGIONS
VISIBLE SPECTRA
PLANETARY NEBULAE
ABUNDANCE
ARGON IONS
ENERGY SPECTRA
FORBIDDEN TRANSITIONS
HELIUM
IONIZATION
NEON IONS
OXYGEN IONS
CHARGED PARTICLES
COSMIC RADIO SOURCES
ELEMENTS
ENERGY-LEVEL TRANSITIONS
FLUIDS
GASES
IONS
NEBULAE
NONMETALS
RARE GASES
SPECTRA
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105 - Astrophysics & Cosmology- Galaxies