آهزش ِ OB1 شکارگر، ~ ~ اریون
âhazeš-e OB1 Šekârgar, ~ ~ Oryon
Fr.: Association Orion OB1
An → OB association consisting of several
dozen → hot stars
of → spectral types O and B
(→ O star, → B star).
The Orion OB1 association consists of several subgroups, first
divided by Blaauw (1964) into four subgroups. The subgroups differ
in age and gas and dust content:
Orin OB1a, which contains the stars to the northwest of
→ Orion's Belt
stars. Within this group lies another subgroup, known as
the → 25 Orionis group;
Orion OB1b, containing the group of stars located in and around the
Orion OB1c, including the stars around
→ Orion's Sword; and
Orion OB1d, which contains the stars in and close to the
→ Orion Nebula
(including the → Trapezium cluster).
→ Orion; → OB association.