Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91.1382d&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, June 1986, p. 1382-1385.
Astronomy and Astrophysics
Astronomy
25
Astronomical Catalogs, Emission Spectra, H Alpha Line, Nitrogen Ions, Stellar Spectrophotometry, Supernova Remnants, Charge Coupled Devices, Data Reduction, Radiant Flux Density, Spectral Energy Distribution
Scientific paper
A deep image of the Kepler SNR has been obtained in the light of H-alpha + N II forbidden-line with the faint object spectrograph and camera (EFOSC) and a CCD detector at the ESO 3.6 m telescope. The visibility of the optically emitting knots of ionized gas has been greatly enhanced by subtraction of the continuum radiation. Features as faint as 2 percent of the night-sky brightness have been identified and a half-shell of emission is clearly revealed. The total H-alpha luminosity of the ionized gas is estimated to be 8.3 x 10 to the 45th photons/s at a distance of 5 kpc implying a mass of ionized hydrogen of about 0.02 solar mass. An automatic searching program has been used to identify and list individual emission features in the continuum-subtracted image. A catalog with accurate celestial positions and approximate fluxes for 64 emission-line knots is given.
Bandiera Rino
Danziger John
Dodorico Sandro
Focardi Paola
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