Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212..203k&link_type=abstract
Astrophysical Journal, Part 1, vol. 212, Feb. 15, 1977, p. 203-210.
Astronomy and Astrophysics
Astronomy
54
Ariel 5 Satellite, Novae, Spaceborne Astronomy, X Ray Sources, Light Curve, Stellar Models, X Ray Stars
Scientific paper
The All-Sky X-ray Monitor on board Ariel-5 has observed the 3-6 keV decline of the bright transient X-ray source A0620-00 on a virtually continuous basis during the period 1975 September-1976 March. The source behavior on time scales greater than about 100 minutes is characterized by smooth, exponential decays interrupted by substantial increases in October and February. The latter increase was an order-of-magnitude rise above the extrapolated exponential falloff, and was followed by a final rapid decline below a level of about 0.05 per sq cm per sec by late March. Upper limits of 2.5% and 10% were found for any periodicities in the range 0.2-10 days during the early and later decay phases, respectively. A probable correlation between the optical and 3-6 keV emission from A0620-00 has been noted, effectively ruling out models involving traditional optical novae in favor of Roche-lobe overflow in a binary system. The existing data on the transient X-ray sources are consistent with two distinct luminosity-lifetime classes of these objects.
Boldt Elihu A.
Holt Stephen S.
Kaluzienski L. J.
Serlemitsos Peter J.
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