2019-08-01_Sky_and_Telescope

Wolf-Rayet Nebulae

30 AUGUST 2019 • SKY & TELESCOPE

ARCS AND FILAMENTS Lying

in the Cygnus OB 3 association,

WR 134 is responsible for this

delicate arc captured by the May-

all 4-meter telescope at Kitt Peak

National Observatory. During the

WR phase, the fast stellar wind

plows into the ambient medium,

which may include matter previ-

ously shrugged off by the supergi-

ant. When the high-speed winds

collide with the nebula around the

star, they generate shocks that we

see as arcs in the visible.

T.^

A.^

RE

CT

OR

/^ U

NIV

ER

SIT

Y^ O

F^ A

LA

SK

A^ A

NC

HO

RA

GE

/^

H.^

SC

HW

EIK

ER

/^ W

IYN

/^ N

OA

O^ /

AU

RA

/^ N

SF