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http://www.skyandtelescope.com/news/80730537.html
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AAVSO originated Under IYA, but continuing beyond Focus: current Epsilon Aurigae eclipse “Citizen” = volunteer or amateur Tutorials, forums, teams, workshops http://www.citizensky.org/
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Conversation with Arne Henden (AAVSO Director) at NACAA 2008. Java replacement for Grant Foster’s DOS program. Collaboration with AAVSO and Citizen Sky participants since May 2009. Early demo given in Aug 2009 at first Citizen Sky workshop at Adler Planetarium, Chicago.
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Frequent releases since Dec 2009. AAS poster about VStar Team in Jan 2010. NACAA 2010 workshop. 2 nd Citizen Sky workshop, San Francisco. There’s still plenty to do… See SourceForge Bug & Issue tracker Want to write code, test, document?
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http://www.citizensky.org/teams/vstar- software-development http://www.citizensky.org/teams/vstar- software-development http://www.citizensky.org/teams/southern- gems http://www.citizensky.org/teams/southern- gems
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Intended to be an easy-to-use variable star data visualization and analysis tool. A SourceForge project licensed under GPL. Click “Download VStar Now” button on this page: http://www.citizensky.org/teams/vstar-software- development http://www.citizensky.org/teams/vstar-software- development Need Java 1.6 or higher installed.
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VStar VStar AAVSO International Database VSX VSX (Variable Star Index) VSX VSX (Variable Star Index) CSV, TSV files
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https://sites.google.com/site/aavsocvsection/ Not U Sco, but another similar system: Artist’s rendition of recurrent nova RS Oph Image credit: David Hardy and PPARC Barbara Harris Shawn Dvorak
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Load U Sco from file Observation details Plot/table link Zoom Change visible series Fainter-thans
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1979 1987 1999 2010
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Jan 28 Jan 27 Feb 2
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Bright (~3rd mag) star in northern constellation Auriga. Eclipsing binary variable distance: 625 parsecs orbital separation: 18 to 20 AU period: 27.1 years duration: almost 2 years Variability first noticed by Johann Fritsch, a German amateur in 1821.
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Epsilon Aurigae (circled) from Adelaide, 20 Dec 2009 at 0030
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Current Epsilon Aurigae eclipse began in August 2009 courtesy www.citizensky.org Minimum: December 2009 (maybe) Mid-eclipse: August 2010 Minimum light ends: March 2011 Eclipse ends: May 2011
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courtesy www.citizensky.org By Nico Camargo and courtesy www.citizensky.org By Brian Thieme and courtesy www.citizensky.org By Nico Camargo and courtesy www.citizensky.org
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Load Epsilon Aurigae from AID Filter obscode (BDJB, MRV) Save, print Info Preferences Colors New group: alpha Ori, del Cep, lx Cyg, omi Cet, x Cyg Error bars Mean series change, anova Help (anyone?)
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http://www.citizensky.org/forum/w-uma-another-eclipsing-binary-star
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Load UMa from a file. Phase plot with period 0.33363749 Replot with period 0.333
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Load X Cyg from file Period analysis Phase plot
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Plug-ins: extend VStar’s functionality. http://www.citizensky.org/teams/vstar- software-development/example-vstar-plugins- jar-files-development-doc http://www.citizensky.org/teams/vstar- software-development/example-vstar-plugins- jar-files-development-doc Create vstar_plugins dir under: Windows: C:\Documents and Settings\user *nix: ~/user
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Mira (omi Cet) Mean bins change Polynomial model: 7 th degree is a good fit
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http://www.youtube.com/watch?v=hhMeumI36BM http://en.wikipedia.org/wiki/Chi_Cygni Mira type pulsating variable post-Asymptotic Giant Branch Star (late stage red giant) 5th to 13th magnitude period: ~407 days
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http://www.mtwilson.edu/vir/CHARA.php http://www.mtwilson.edu/vir/CHARA.php http://www.citizensky.org/teams/vstar- software-development http://www.citizensky.org/teams/vstar- software-development https://sourceforge.net/projects/vstar/ https://sourceforge.net/projects/vstar/ http://www.citizensky.org/teams/vstar-software- development/vstar-citizen-sky-2-demo-data-files http://www.citizensky.org/teams/vstar-software- development/vstar-citizen-sky-2-demo-data-files http://www.citizensky.org/teams/vstar-software- development/example-vstar-plugins-jar-files-development- doc http://www.citizensky.org/teams/vstar-software- development/example-vstar-plugins-jar-files-development- doc
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