Galaxy Zoo Talk

Foreground star

  • bluemagi by bluemagi

    I classed this as a merger of a disturbed loose barred spiral with another barred spiral but on the SDSS it says Star (G8V) but it also says galaxy. I am totally confused.I know that the star is a foreground star.

    Posted

  • Budgieye by Budgieye moderator

    SDSS Skyserver has software to analyze images without a person having to look at it. People (like us) can see where the software has made mistakes.

    The algorithm is

    Round = star

    Not round = galaxy

    The software looks for edges, but it doesn't see any edges around the star, so it goes out to the galaxy edge, and so analyses it as a galaxy.

    http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=236.4350933432092&dec=11.4041606647473

    A different piece of software analyzes the spectral chart, and categorizes it as a hot blue star.

    enter image description here

    Posted

  • bluemagi by bluemagi

    Thanks

    Posted