Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000arep...44..190t&link_type=abstract
Astronomy Reports, Volume 44, Issue 3, March 2000, pp.190-201
Astronomy and Astrophysics
Astronomy
4
Scientific paper
We present spectrophotometric (3400 7500 Å) observations of the evolution of a strong outburst of the classical symbiotic star YY Her in 1993 and photoelectric UBV observations of the star’s eclipse in 1997. The duration of the phase of lowest brightness, when the U brightness had decreased by ˜1.3m, was ˜0.17 P orb (P orb is the orbital period). If this phase is due to the total eclipse of ˜70% of the radiation of the circumstellar envelope, this duration implies that the cool component of YY Her fills its Roche lobe, the bulk of the envelope’s volume emission measure is concentrated around the hot component in a region with rather sharp boundaries r &MediaObjects/Figure1.jpg;
Buson Lucio Maria
Kolotilov Eugenii A.
Munari Ulisse
Rejkuba Marina
Tatarnikova A. A.
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