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 [...]

Licensing

	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.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	04:51, 16 November 2009		445 × 189 (13 KB)	Materialscientist	cropped white space
	03:04, 27 September 2009		510 × 203 (14 KB)	Marshallsumter	{{Information \|Description={{en\|1=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 sta

File usage

The following pages on the English Wikipedia use this file (pages on other projects are not listed):

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Usage on el.wikipedia.org
- Ηρακλής X-1
Usage on fr.wikipedia.org
- Source astrophysique de rayons X
Usage on nl.wikipedia.org
- Röntgenastronomie
Usage on ru.wikipedia.org
- Геркулес X-1
Usage on sv.wikipedia.org
- Hercules X-1

File:Herx1 lc.gif

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26 June 2003

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