Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1239s&link_type=abstract
Astronomical Journal v.100, p.1239
Astronomy and Astrophysics
Astronomy
13
Stars: Emission-Line, Clusters: Open
Scientific paper
Long-term monitoring of NGC 663 on objective-prism plates confirms the
presence of 24 Hα-emission-line stars, half of which show evidence
of marked emission-line variability on a timescale of years to decades.
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