Astronomy and Astrophysics – Astronomy
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1807r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, May 1991, p. 1807-1820.
Astronomy and Astrophysics
Astronomy
7
Astronomical Spectroscopy, Novae, Balmer Series, Emission Spectra, Interstellar Extinction, Light Curve, Stellar Spectrophotometry
Scientific paper
Nova V443 Scuti 1989 reached its maximum, of visual magnitude about 7.5, very likely on September 13-14, 1989, displaying in its early decline brightness fluctuations of relatively large amplitude with a periodicity of about 17 days. In October the spectrum was characterized by the presence of the Balmer emission lines and by those of Fe II, Na I, Ti II, O I, N II accompanied by two systems of displaced P Cyg absorptions, having an average velocity of about -710 and -1460 km/s. The transition phase took place in November, with the appearance of forbidden N II 5755 and O II 7319 -30 and with the O I 6300 - 6364 flash. In March 1990, the nova was found in the nebular phase with wide emission lines of H, He I, He II, and collisionally excited lines of forbidden N II, O II, O III, and Ne III. From April to July, the degree of ionization having further progressed, forbidden lines of Fe VI, Fe VII, A III, A IV, A V, Ca V, and possibly also of Fe X, emerged.
Benetti Stefano
Della Valle Massimo
Iijima Toru
Rafanelli Piero
Rosino Leonida
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