The DIM inner accretion disk of the quiescent black hole A0620-00

Details The DIM inner accretion disk of the quiescent black hole A0620-00 The DIM inner accretion disk of the quiescent black hole A0620-00

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...442..358m&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 442, no. 1, p. 358-365

Astronomy and Astrophysics

Astronomy

102

Accretion Disks, Black Body Radiation, Black Holes (Astronomy), Stellar Luminosity, Stellar Spectra, Ultraviolet Spectra, X Ray Binaries, X Ray Spectra, Light Curve, Mass Flow Rate, Mass Transfer, Spectrum Analysis, Stellar Spectrophotometry

Scientific paper

We observed the X-ray nova A0620-00 with the Hubble Space Telescope (HST) Faint object Spectrograph 16 yr after its 1975 outburst. We present a single spectrum (1250-4750 A), which is approximately an average over a full 7.8 hr orbital cycle of the source. The continuum can be fitted approximately by a blackbody model with T = 9000 K and a small projected source area, which is approximately 1 % of the expected area of the accretion disk. AS0620-00 is faint in the far-UV band; its luminosity is comparable to the luminosity of the quiescent dwarf-nova accretion disk (i.e., excluding the white dwarf). By analogy with dwarf novae, the optical luminosity of the disk (Mnu approximately = 7) and the orbital period of A0620-00 imply that the rate of mass transfer onto the outer disk in Md approximately 10-10 solar mass/yr. We also observed A0620-00 with the ROSAT PSPC X-ray detector for 3 x 104 s and detected a faint source (5 sigma) at the location of the X-ray nova. For an assumed blackbody spectrum the source temperature and luminosity are approximately 0.16 keV and 6 x 1030 ergs/s, respectively (d = 1 kpc). This luminosity implies that the rate of mass transfer into the black hole is extraordinarily small: MBH less than 5 x 10-15 solar mass/yr. The much larger mass transfer rate onto the outer disk, and the UV/X-ray faintness of the inner disk confirm key predictions of the disk instability model for the nova outburst of A0620-00 published by Huang and Wheeler and by Mineshige and Wheeler.

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