File:Herx1 lc.gif

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Summary

DescriptionHerx1 lc.gif	English: This light curve of Her X-1 shows long term and medium term variability. Each pair of vertical lines deliniate the eclipse of the compact object behind its companion star. In this case, the companion is a 2 Solar-mass star with a radius of nearly 4 times that of our Sun. This eclipse shows us the orbital period of the system, 1.7 days. The long term variability shown here is precession of a disk of accreting matter around the neutron star. This precession has a 35-day period. In addition, the neutron star in Her X-1 is also a pulsar with a 1.24 second pulse period.
Date	26 June 2003
Source	NASA's HEASARC: Observatories, Goddard Spaceflight Center, Uhuru observations of Hercules X-1
Author	HEASARC Director: Dr. Alan P. Smale HEASARC Associate Director: Dr. Roger Brissenden Responsible NASA Official: Phil Newman Web Curator: Meredith Gibb
Permission (Reusing this file)	Images produced by NASA are usually free of copyright [...]

	This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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	Date/Time	Thumbnail	Dimensions	User	Comment
current	04:51, 16 November 2009		445 × 189 (13 KB)	wikimediacommons>Materialscientist	cropped white space

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