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A reprocessing model for the ultraviolet and optical light from 4U 1820-30We show that the recently discovered optical and ultraviolet light from the X-ray burst source 4U 1820-30 in the globular cluster NGC 6624 is due to reprocessing of the X-rays in the outer regions of an optically thick, geometrically thin accretion disk. We suggest that observation of orbital modulation of the reprocessed light, due to the variable contribution made as the heated face of the companion turns toward and away from the observer, would provide constraints on the inclination of the binary orbit, and we suggest that detection in the reprocessed flux of the 'red noise' already observed in the X-rays would provide useful constraints on the geometry and physics of the accretion disk.
Document ID
19930071106
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Arons, Jonathan (NASA Headquarters Washington, DC United States)
King, Ivan R. (California Univ. Berkeley, United States)
Date Acquired
August 16, 2013
Publication Date
August 20, 1993
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 413
Issue: 2
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG5-1607
CONTRACT_GRANT: W-7405-ENG-48
CONTRACT_GRANT: NAGW-2413
Distribution Limits
Public
Copyright
Other