Studies of two LYNDS bright nebulae - LBN 140.77 - 1.42, a remarkable thermal ridge, and LBN 139.57 + 2.70, a radio and infrared partial ring

Details Studies of two LYNDS bright nebulae - LBN 140.77 - 1.42, a remarkable thermal ridge, and LBN 139.57 + 2.70, a radio and infrared partial ring Studies of two LYNDS bright nebulae - LBN 140.77 - 1.42, a remarkable thermal ridge, and LBN 139.57 + 2.70, a radio and infrared partial ring

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.2210g&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Dec. 1989, p. 2210-2220.

Astronomy and Astrophysics

Astronomy

5

Infrared Spectra, Nebulae, Radio Spectra, Astronomical Catalogs, Astronomical Spectroscopy, Emission Spectra, H Ii Regions, Infrared Astronomy Satellite, Radio Telescopes

Scientific paper

Observations at 408 MHz of two extended features corresponding to objects in Lynds' (1965) catalog of bright nebulae are presented. These are LBN 140.77 - 1.42, which corresponds to a linear radio ridge roughly 2 deg in extent that is approximately perpendicular to the Galactic plane, and LBN 139.57 + 2.70, which shows a partial radio ring roughly 12 arcmin in radius. The radio emission from LBN 140.77 - 1.42 has a thermal spectrum, and it coincides with the western edge of a large 'spur' that is evident in atomic hydrogen in the Perseus arm. Part of this 'spur' is also evident in the infrared at all IRAS wavebands. Thus, LBN 140.77 - 1.42 appears to be a remarkably large-scale ionization front penetrating a large interstellar cloud. The nature of LBN 139.57 + 2.70 is not clear.

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