The ejected envelope of a red giant star, spread over a volume roughly the size of our solar system, with a hot central star that is in the process of becoming a white dwarf star
M45 The Seven Sisters:
Pleiades Star Cluster
What is a Star Cluster [Star Cloud]?
What are the 2 types & their properties?
Groups of stars
globular clusters [GC]: tight groups
100s of 1,000s of very old stars gravitationally bound
open clusters: more loosely clustered
generally contain few 100 stars
often very young
M13Hercules Globular Cluster: visible to the Naked Eye
has a planet in close orbit around it
purple glow means it's an X-ray source
a very active star
Cas A Cassiopeia A:
youngest known supernovaremnant in the Milky Way galaxy
Tycho's Star Cassiopeia:
Shines in Gamma Rays
When Does a Supernova Become a Supernova Remnant [the expanding glowing remains from a supernova]?
measure the total E coming from the explosion and how it declines with time
track the radiation produced when shock waves generated by the rapidly expanding supernova debris slam into surrounding gas If the light from the explosiondominates, the object is still a supernova
If the light from the collisiondominates, it has become a supernova remnant
Explosive death of a star
caused by the sudden onset of nuclear burning in a white dwarf star
Small, cool faint stars at the lower-right end of the main sequence on the H-R diagram, whose color and size give them their name
A dense stellar remnant produced by the collapse of the core of a massive star as part of a supernova that destroys the rest of the star
Typically composed almost entirely of neutrons
About 20km in diameter
About 1.5 times as massive as the Sun
Binary Star System
A system in which two stars orbit about their common center of gravity
Open [Star] Cluster
Loosely bound collection of tens to hundreds of stars, a few parsecs across, generally found in the plane of the Milky Way.
Tightly bound, roughly spherical collection of hundreds of thousands, and sometimes millions, of stars spanning about 100 light years. Globular clusters are distributed in the halos around the Milky Way and other galaxies.
What 2 Star Clusters are in Taurus [The Bull]?
M13 Hyades Hercules
What is the Great Globular Cluster?
nickname for M13 in Hercules
The Orion Nebula
South of Orion's beltClosest region of massive star formation to Earth
youngest planet ever observed being born
Wolf Rayet Star
NGC 281 Pac Man
NGC7000 North American Nebula
30 DoradusThe Tarantula Nebula
NGC 7293 The Helix Nebula
g359.23-0.82 The Mouse
SS433 mini Quasar
RFTS 2013 DSOs Images
Images of the Deep Space Objects that you need to know for RFTS 2013 SciOly