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

Journal Article · Fri Jan 01 04:00:00 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), Journal Name: Astron. J.; (United States) Vol. 95; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

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