ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

Hits per page

hit 1 - 1 | 1 hit

Select All Export

Unknown

Evidence for an about 300 day period in Cygnus X-1 (1983)

Priedhorsky, W. C. ; Terrell, J. ; Holt, S. S.

In: Other Sources

add to mindlist on the mindlist

Details

Publication Date: 2011-08-18

Description: Results from 10 years of observation of Cyg X-1 by the Vela 5B satellite are reported. Good evidence for an approximately 300 day period is found, which is confirmed by independent data from the All-Sky Monitor instrument on Ariel 5. Cyg X-1 varies by about 25 percent with a 294 + or -4 day period. This modulation is apparently unrelated to the known transitions between the source high and low states. Flux minima occur at 1974.05+nP. The 294 day period is consistent with the precession of the supergiant companion HDE 226868 and also with the precession period of a tilted accretion disk. The light curve could be modulated by a change in the mass transfer rate or variable obscuration by ionized matter.

Keywords: ASTROPHYSICS

Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 270; July 1

Format: text

	Location	Call Number	Expected	Availability

Others were also interested in ...

NASA TECHNICAL REPORTS

S·F·X

hit 1 - 1 | 1 hit