Query : 2001A&A...367..273S

2001A&A...367..273S - Astronomy and Astrophysics, volume 367, 273-276 (2001/2-3)

Research Note. IY Ursae Majoris: accretion disc evolution after superoutburst.


Abstract (from CDS):

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 TBR∼5000-5500K. 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, ∼15900K and ∼13800K, respectively.

Abstract Copyright:

Journal keyword(s): accretion, accretion disc - binaries: eclipsing - stars: individual: IY UMa - dwarf nova, cataclysmic variables

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 V* Z Cha CV* 08 07 27.7421647579 -76 32 00.679589237   12.00       M5.5 594 1
2 V* OY Car CV* 10 06 22.0792108747 -70 14 04.582997921           ~ 556 0
3 V* IY UMa CV* 10 43 56.7486759841 +58 07 31.917125704   17.52 16.61 17.62 17.60 ~ 103 0

    Equat.    Gal    SGal    Ecl

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