Astronomy Unit 5 Flashcards

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1
Q

a loose group of young stars whose spectral types, motions, and positions in the sky indicate a
common origin

A

association

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2
Q

one of about 150 large, spherical star clusters (each with hundreds of thousands of stars) that
form a system of clusters in the center of our Galaxy

A

global cluster

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3
Q

a nearly explosive ignition of helium in the triple-alpha process in the dense core of a red giant
star

A

helium flash

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4
Q

location in the H–R diagram where stars begin to leave the main sequence

A

main-sequence turnoff

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5
Q

the building up of heavy elements from lighter ones by nuclear fusion

A

nucleosynthesis

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6
Q

a comparatively loose cluster of stars, containing from a few dozen to a few thousand members,
located in the spiral arms or disk of our Galaxy; sometimes referred to as a galactic cluster

A

open cluster

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7
Q

a shell of gas ejected by and expanding away from an extremely hot low-mass star that is
nearing the end of its life (the nebulae glow because of the ultra-violet energy of the central star)

A

planetary nebula

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8
Q

a nuclear reaction by which three helium nuclei are built up (fused) into one carbon
nucleus

A

triple-alpha process

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