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A Model for the Quiescent Phase of the Recurrent Nova U Scorpii.
MedLine Citation:
PMID:  10813679     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A theoretical light curve is constructed for the quiescent phase of the recurrent nova U Scorpii in order to resolve the existing distance discrepancy between the outbursts (d approximately 6 kpc) and the quiescences (d approximately 14 kpc). Our U Sco model consists of a very massive white dwarf (WD), an accretion disk (ACDK) with a flaring-up rim, and a lobe-filling, slightly evolved, main-sequence star (MS). The model properly includes an accretion luminosity of the WD, a viscous luminosity of the ACDK, and a reflection effect of the MS and the ACDK irradiated by the WD photosphere. The B light curve is well reproduced by a model of 1.37 M middle dot in circle WD + 1.5 M middle dot in circle MS (0.8-2.0 M middle dot in circle MS is acceptable) with an ACDK having a flaring-up rim and the inclination angle of the orbit i approximately 80&j0;. The calculated color is rather blue (B-V approximately 0.0) for a suggested mass accretion rate of 2.5x10-7 M middle dot in circle yr-1, thus indicating a large color excess of E(B-V) approximately 0.56 with the observational color of B-V=0.56 in quiescence. Such a large color excess corresponds to an absorption of AV approximately 1.8 and AB approximately 2.3, which reduces the distance to 6-8 kpc. This is in good agreement with the distance estimation of 4-6 kpc for the latest outburst. Such a large intrinsic absorption is very consistent with the recently detected period change of U Sco, which is indicating a mass outflow of approximately 3x10-7 M middle dot in circle yr-1 through the outer Lagrangian points in quiescence.
Authors:
Hachisu; Kato; Kato; Matsumoto; Nomoto
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  The Astrophysical journal     Volume:  534     ISSN:  0004-637X     ISO Abbreviation:  Astrophys. J.     Publication Date:  2000 May 
Date Detail:
Created Date:  2000-05-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9890633     Medline TA:  Astrophys J     Country:  -    
Other Details:
Languages:  ENG     Pagination:  L189-L192     Citation Subset:  -    
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