Upload
oki
View
32
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Citizen Sky and VStar. http://www.skyandtelescope.com/news/80730537.html. Citizen Sky. AAVSO originated Under IYA, but continuing beyond Focus: current Epsilon Aurigae eclipse “Citizen” = volunteer or amateur Tutorials, forums, teams, workshops http://www.citizensky.org/. - PowerPoint PPT Presentation
Citation preview
http://www.skyandtelescope.com/news/80730537.html
AAVSO originated Under IYA, but continuing beyond Focus: current Epsilon Aurigae
eclipse “Citizen” = volunteer or amateur Tutorials, forums, teams, workshops http://www.citizensky.org/
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.
Frequent releases since Dec 2009. AAS poster about VStar Team in Jan
2010. NACAA 2010 workshop. 2nd Citizen Sky workshop, San Francisco. There’s still plenty to do…
See SourceForge Bug & Issue tracker Want to write code, test, document?
http://www.citizensky.org/teams/vstar-software-development
http://www.citizensky.org/teams/southern-gems
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-de
velopment
Need Java 1.6 or higher installed.
VStarVStar VStarVStar
AAVSO AAVSO International International
DatabaseDatabase
AAVSO AAVSO International International
DatabaseDatabase
VSXVSX(Variable (Variable
Star Index)Star Index)
VSXVSX(Variable (Variable
Star Index)Star Index)
CSV, CSV, TSV TSV filesfiles
CSV, CSV, TSV TSV filesfiles
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
Load U Sco from file Observation details Plot/table link Zoom Change visible series Fainter-thans
1979
1987
1999 2010
Jan 28
Jan 27
Feb 2
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.
Epsilon Aurigae (circled) from Adelaide, 20 Dec 2009 at 0030
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
courtesy www.citizensky.org
By Brian Thieme and courtesy www.citizensky.org
By Nico Camargo and courtesy www.citizensky.org
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?)
http://www.citizensky.org/forum/w-uma-another-eclipsing-binary-star
Load UMa from a file. Phase plot with period 0.33363749 Replot with period 0.333
Load X Cyg from file Period analysis Phase plot
Plug-ins: extend VStar’s functionality.
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
Mira (omi Cet) Mean bins change Polynomial model: 7th degree is a good fit
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
http://www.mtwilson.edu/vir/CHARA.php
http://www.citizensky.org/teams/vstar-software-development
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/example-vstar-plugins-jar-files-development-doc