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Date: Tue, 2 Oct 2012 10:55:07 -0700 (PDT)
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Subject: High Resolution Images of the Algol Triple Star System
From: Yosemite Samuelson <yosemite.samuel...@gmail.com>
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http://www.oculum.de/newsletter/astro/100/60/2/162.fa1cn.asp

Translation by Google Translate. Although there are many slips, the
gist of the article is readily understandable.

Algol B orbits Algol A: an animation of 55 images of the CHARA
interferometer, which were grouped according to the orbit. Because
some stages are covered poorly, B jumps at some points along its path.
[Baron]
http://www.oculum.de/newsletter/astro/100/60/2/2-02_algol_movie.gif

The eclipsing binary =E2 Persei alias alias Devil star Algol is the
first ever discovered variable star, where it is unclear whether this
was recognized in antiquity, the Middle Ages and in 1667 in Italy for
the first time safely. But whatever about the end of the 18th Century
found that the brightness variations of Algol between 2, and 3 m1, m4
are strictly periodic. Another hundred years later clarified by means
of spectroscopy that there are two stars orbit on a narrow path and
the darker the brighter regularly covered. Since then, many
astronomers have sought to elucidate the detailed prototype Algol
system that turned out to be even as a three-fold: It finally
succeeded with the optical interferometer NPOI, all three stars
spatially resolve. And the optical interferometer CHARA on the
California Mount Wilson has now enabled even better: Thanks baselines
of up to 331m between the six 1-m telescopes and modern methods of
interferometric analysis is not only the physical parameters of the
famous variable better than ever been determined. There was even a
real "film" are created from two-dimensional reconstructed images, in
which the extremely tight pair of star Algol A / B in fast circles
around each other. It is clear to see that B - has robbed most of its
mass from A - moved noticeably in the length: This star filled - which
had been developed for a long time indirectly - its Roche limit of
broadly ovate.

Further evaluations should provide even sharper images of the stars
and maybe even details of their surfaces. But in a totally different
direction the Algol research may just found it: In a 3200 year-old
Weissagungskalender from ancient Egypt, every day is divided into
three eight-hour periods. Each of these periods has in the calendar
either the attribute "" good "or" bad. Finnish physicists have
analyzed these periods and are met with a periodicity of 2.85 days,
which - according to that of the synodic orbit of the moon - is by far
the strongest. The value is suspiciously close to the current 2.87
days in the period of Algol: Did the Egyptians already knew his
variability and determine the period - and the difference is
significant even today? The increase in the period in the course of
time - as a consequence of the mass exchange of A and B - in any case
would be incorrect.

So the Algol system saw on 12 August 2009 from: no artistic
representation but a true two-dimensional image with 1/2 milli-
arcsecond resolution in the near-infrared H-band, reconstructed from
data of the CHARA interferometer. The elongated appearance of Algol B
and the round of Algol A are real, in the form of C, however, is an
artifact of Algol. [Baron et al.]
http://www.oculum.de/newsletter/astro/100/60/2/2-01_algol_g.jpg

Yosemite Samuelson