OH emission from early-type emission-line stars with large infrared excesses

Journal Article · Fri Jun 01 04:00:00 EDT 1979 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/157099· OSTI ID:6094351

Davis, L E; Seaquist, E R; Purton, C R

We present the results of a search for ground-state OH emission from 23 early-type emission-line stars with large infrared excesses. The objects were searched at 1612, 1665, and 1667 MHz with the 300 m Arecibo telescope. We detected one new object, Vy 2--2, and confirmed the results of Fix and Mutel for the peculiar OH source M 1--92. The 1612 MHz profile for Vy 2--2 displays a single, strong, asymmetric feature about 10 km s/sup -1/ wide. Vy 2--2 is also an infrared source and a thermal radio continuum source, and has been classified as a planetary nebula of stellar appearance . If the latter classification is correct, it is the first planetary nebula detected in OH. The association of 1612 MHz OH emission and the infrared spectrum suggest that the pump mechanism for Vy 2--2 is far-infrared radiation. Vy 2--2 may represent a planetary nebula in the process of formation. The bipolar nebula M 1--92 has remained unchanged in intensity since 1973. Its evolutionary state is not known. The stars HK Ori and LkH..cap alpha.. 208, suggested as possible weak OH emitters by Lepine and Nguyen-Quang-Rieu, were not detected.

• Research Organization: David Dunlap Observatory, University of Toronto
• OSTI ID: 6094351
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 230:2; 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
CHEMICAL COMPOSITION
CHEMISTRY
COSMIC DUST
COSMOCHEMISTRY
DUSTS
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
HYDROXYL RADICALS
INFRARED RADIATION
INFRARED SPECTRA
NEBULAE
PLANETARY NEBULAE
RADIATIONS
RADICALS
SPECTRA
STARS
VARIABLE STARS
VARIATIONS