Zeta ([zeta]) Persei is the most southerly bright star of Perseus--and also the brightest star in the Zeta Persei OB Association
. Other hot stars of spectral type O and B in the association, which is estimated to have a remarkably young age of only about 1 million years, include Omicron ([omicron]), Xi ([xi]), 40, X, and AG Persei.
New research by astrophysicists from the University of Rochester focused on stars in the north part of the constellation, known as Upper Scorpius, which is a part of the Scorpius-Centaurus OB association
, one of the best studied groups of young stars and a benchmark sample for investigating the early lives of stars and the evolution of their planet-spawning disks.
About 35 of the thousands of stars in this group, known as the Scorpius-Centaurus (Sco-Cen) OB association
, weigh several times as much as the sun.
While moving at random and not gravitationally bound, the hot, young stars of spectral type O and B in Scorpius, Centaurus, and Crux have astrophysical importance as the nearest OB association
to our Sun.
Antares is the brightest member of the Scorpius-Centaurus OB Association
, the nearest such large grouping of hot, young stars of spectral class O and B.
THE MILKY WAY in Puppis and Vela harbors many young blue stars and fine open clusters that are part of the Vela OB association
. They're well known to Southern Hemisphere observers but less familiar to stargazers farther north.
The cluster lies about 1,600 light-years away--consistent with many of the stars in the giant Scorpius-Centaurus OB association
, a large grouping of massive stars that have a common age and proper motion.
The Scorpius-Centaurus OB association
is the nearest region of significant ongoing star formation.
This hot, blue-white supergiant is believed to be part of the Scorpius-Centaurus OB Association
("Sco-Cen"), a large region of recent and ongoing star formation that counts among its members many of the brighter stars in tonight's sky.
While both are members of the sprawling Scorpius-Centaurus OB association
, a grouping of hot young stars in our local spiral arm that were born around the same time (several million years ago), Upsilon is about 180 light-years closer to us.
At a distance of 600 light-years, Antares is probably the most famous member of the Scorpius-Centaurus OB Association
(see the June issue, page 90).
Considered to be a member of the Scorpius-Centaurus OB Association
(June issue, page 90), 2.3-magnitude Alpha Lupi is some 550 light-years distant.