Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..402i&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 676, June 1992, p. 402-407. Research supported
Astronomy and Astrophysics
Astronomy
20
Astronomical Photometry, Astronomical Spectroscopy, Eclipsing Binary Stars, Supernovae, Accretion Disks, Ephemerides, Spectral Energy Distribution, Stellar Envelopes, Stellar Magnitude
Scientific paper
Observations of Nova Herculis 1991 obtained during the months of 1991 May-September are presented. Spectral observations a few weeks after outburst constrain the distance to Nova Her to between 6 and 12 kpc and show evidence of dust formation in the expanding shell and line profiles with five components having large expansion velocities. Initial photometric observations of the nova in June showed the nova had declined approximately ten magnitudes in the V band from its maximum, and by September, the nova had dimmed by approximately two additional magnitudes. The period derived from these observations agrees with that reported by Leibowitz et al. (1992). Periodic eclipses with a depth of about 0.7 V mag are observed, and the depths of the eclipses are constant over a 2-month period while the overall brightness diminished by one magnitude. The long duration of the eclipses indicates an eclipse of an extended source, likely the accretion disk.
Garnavich Peter
Green Paul
Ingram Doug
Szkody Paula
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