First optical detection of W51 and observations of new H II regions and exciting stars

Details First optical detection of W51 and observations of new H II regions and exciting stars First optical detection of W51 and observations of new H II regions and exciting stars

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....66....1c&link_type=abstract

Astronomy and Astrophysics, vol. 66, no. 1-2, May 1978, p. 1-11.

Astronomy and Astrophysics

Astrophysics

157

Galactic Structure, H Alpha Line, H Ii Regions, Milky Way Galaxy, Nebulae, Astronomical Catalogs, Astronomical Maps, Astronomical Photometry, Fabry-Perot Interferometers, Radial Velocity

Scientific paper

Three H-alpha sources near the W51 complex have been detected optically. Radial velocities of these regions obtained by Fabry-Perot interferograms show the connection of these H-alpha regions with the radio complexes, although their positions are not identical. Optical detection of some other H109-alpha sources such as W48 and G 69.9 plus 1.5 is discussed. Photometric and spectroscopic observations of recently identified stars in H II regions, and radial velocities of 23 new H II regions, have been obtained for galactic longitudes of 20 to 115 deg. These optical results confirm the existence of another arm between 90 and 112 deg beyond the Perseus arm.

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