Detection of a large very faint emission nebula surrounding Alpha Virginis

Details Detection of a large very faint emission nebula surrounding Alpha Virginis Detection of a large very faint emission nebula surrounding Alpha Virginis

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90...92r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, Jan. 1985, p. 92-94.

Astronomy and Astrophysics

Astronomy

13

B Stars, H Alpha Line, Nebulae, Stellar Spectra, Emission Spectra, H Ii Regions, Ionized Gases, Lyman Spectra, Radial Velocity

Scientific paper

Twenty-nine Hα scans were obtained with the Wisconsin 15-cm Fabry-Perot spectrometer in a 32° diameter region surrounding the high galactic latitude B star α Vir. The scans reveal an H II region 14°×18° in extent with an emission measure of 8 cm-6pc, a gas density of about 0.6 cm-3, and a radial velocity of -6±1 km s-1 with respect to the local standard of rest. The total hydrogen ionization rate within the H II region is estimated to be 1.9±0.6×1046s-1.

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