Research Note IY Ursae Majoris: Accretion disc evolution after superoutburst

Details Research Note IY Ursae Majoris: Accretion disc evolution after superoutburst Research Note IY Ursae Majoris: Accretion disc evolution after superoutburst

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...367..273s&link_type=abstract

Astronomy and Astrophysics, v.367, p.273-276 (2001)

Astronomy and Astrophysics

Astrophysics

5

Accretion, Accretion Disc, Binaries: Eclipsing, Stars: Individual: Iy Uma, Dwarf Nova, Cataclysmic Variables

Scientific paper

CCD photometry of the newly discovered eclipsing dwarf nova IY Ursae Majoris is used to study the physical properties of the accretion disc in the late decline and quiescence stages. Eclipse mapping analysis shows that in these stages the accretion disc is cool with approximately flat radial brightness temperature distribution and T_BR ~ 5000-5500 K. The hot spot is found to lie close along the stream trajectory at distance 0.36a and 0.25a from the disc center in February and March. The orbital hump strength decreases by ~ 30% in a month. Taking the smallest possible size of the hot spot, we derive an upper limit for its brightness temperature, ~ 15 900 K and ~ 13 800 K, respectively.

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