Particulars:
General
This small constellation is located between Boötes and Hercules (+40 dec. to +26 dec.; the thought line of 16 RA crosses the 'crown' at its eastern extension). The constellations brightest star Gemma, also known as Alphecca, is set like a juwel in the midst of the crown.
Stars and other objects
The recurrent nova T CrB, also known as the Blaze Star,
is with a brightness of 10 mag usually not visible by the eye,
but twice it became bright enough to be seen without optical
help: First reported in 1866, it reaches 2 mag; in 1946 it
brightened again an reached 3 mag. At any time there might be
further eruptions.
Within a few years R CrB show enourmous changes in its
brightness. Normally its about 6 mag and therefore at the limit
where stars can be seen by the naked eye (of course not in the
lightpolluted cities), but the brightness can drop down to 14 mag
within a few weeks. When this is going to take place is not
predictable. After that drastic drop in brightness it can take
months before the normal Magnitude is reached again. A possible
explanation is that carbon particles at the outer layers of the
star are more or less periodically (chaotic ?) are build up and
then blown away darkening the radiation of the star.
Gamma CrB and eta CrB are close doubles, the first
requiring about 101 years, the latter 42 years for a revolution.
For small scopes zeta CrB is a nice pair of blue stars (5
mag and 6 mag) to observe.
Nu1 nu2 CrB is a wide pair of 5 mag orange giants, best
seen in binoculars. This pair is not physically related.
Mythological Background
In his "Metamorphoses", book VIII, the roman poet
Ovid (Publius Ovidius Naso, 43 BC to 17 AC) mentions the story of
Theseus and the Minotaurus and how Theseus was able to overcome
that monster with the help of the princess of Crete, Ariadne.
Leaded by the string she gave Theseus he was able to escape the
dark caves of the labyrinth where the Minotaurus had lived.
After this success he took Ariadne with him to Naxos. But once
they reached the coast Theseus left her. Her cries and
lamentations were heard by Bacchus, who gave her his love and
protection. To make glorify her forever between the stars he took
her crown and lift it up to the skies. During its flight the
juwels turned to glittering stars still forming a crown.