Happy Halloween

God & Science Forum Message

Forums: Atm · Astrophotography · Blackholes · Blackholes2 · CCD · Celestron · Domes · Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem
RSS Button

Home | Discussion Forums | God and Science | Post
Login

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Model This...

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Robert Garfinkle on June 21, 2003 23:31:41 UTC

to quote "SpaceFlight Now" space news (June 14th 2003) "Flattest Star Ever Seen":

The high degree of flattening measured for Achernar - a first in observational astrophysics - now poses an unprecedented challenge for theoretical astrophysics. The effect cannot be reproduced by common models of stellar interiors unless certain phenomena are incorporated, e.g. meridional circulation on the surface ("north-south streams") and non-uniform rotation at different depths inside the star.

http://spaceflightnow.com/news/n0306/14flattest/

And to quote: ScienceNow (12 June 2003)

Achernar turned out to be much flatter than expected, Kervella says. In fact, its polar diameter is a mere 64% of its equatorial diameter (the previous record was 85%). That was a surprise, given that the spin rate of 225 kilometers per second suggested a flattening of only 80%. One possible reason is that gas inside a star may spin even faster than the gas on the surface, which would bloat its midriff, says Grant Bazán of Lawrence Livermore National Laboratory (LLNL) in California. Studying that effect would require a three-dimensional model of the star, says Kervella.

http://www.govertschilling.nl/artikelen/science/030612_sc.htm

Follow Ups:

    Login to Post
    Additional Information
    Google
     
    Web www.astronomy.net
    DayNightLine
    About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
    Unless otherwise specified, web site content Copyright 1994-2018 John Huggins All Rights Reserved
    Forum posts are Copyright their authors as specified in the heading above the post.
    "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET"
    are trademarks of John Huggins