Astronomy Test 5 Continued

Front 1

Plage

Back 1

A bright spot on the sun believed to be associated with emerging magnetic field

Front 2

Solar model

Back 2

A set of equations that describes the internal structure and energy generation of the sun.

Front 3

Granulation

Back 3

The rice grain like structure of the solar photosphere due to convection of solar gases.

Front 4

Supergiant

Back 4

A star of very high luminosity.

Front 5

Optical double

Back 5

A pair of stars that appear to be near each other but are unbound and at very different distances from Earth.

Front 6

Radioactive zone

Back 6

A region inside a star where energy is transported outward by the Movement of photons through a gas from a hot location to a cooler one.

Front 7

Giant star

Back 7

A star whose diameter is roughly 10 to a 100 times that of the Sun.

Front 8

Zeeman effect

Back 8

A splitting of spectral lines in the presence of a magnetic field.

Front 9

Neutrino

Back 9

A sub comic particle with no electric charge and little mass not is important in many nuclear reaction and supernovae.

Front 10

Convective zone

Back 10

A layer in a star where the energy is transported outwards by means of convection also known as that convective envelope or convection zone.

Front 11

Helioseismology

Back 11

The study of vibrations of the solar surface.

Front 12

Apparent magnitude

Back 12

A measure of the brightness of light from a star or other object as seen from Earth.

Front 13

Granules

Back 13

Lightly colored convection Features about a 1000 mm in diameter seen constantly in the solar photoshphere

Front 14

Super granule

Back 14

A large convective cell in the Sun's chromosphere containing Many granules

Front 15

Photometry

Back 15

The measurement of light intensities

Front 16

Photosphere

Back 16

The region in the solar atmosphere from which most of the visible light escapes into space.

Front 17

Spectral types

Back 17

A classification of stars according to the appearance of their spectra

Front 18

Visual binary star

Back 18

A double star in which the 2 components can be resolved through a telescope.

Front 19

Stellar spectroscopy

Back 19

Study of the properties of stars encoded in their spectra

Front 20

Chromosphere

Back 20

The layer in the solar atmosphere between the photo sphere and the Corona.

Front 21

Mass luminosity relation

Back 21

The direct relationship between the masses and luminosity of main sequence stars

Front 22

Solar cycle

Back 22

A 22 year cycle during which the Sun's magnetic field reverses in polarity twice

Front 23

Main sequence

Back 23

A grouping of stars on the HR diagram extending diagonally across the graph from the hottest brightest stars to the dimmest coolest stars.

Front 24

Limb darkening

Back 24

The phenomenon where the Sun is darker near its limb then near the center of its disk.

Front 25

Obafgkm

Back 25

The sequence of stellar spectral classifications from the hottest 2 coolest stars.

Front 26

Magnetic dynamo

Back 26

A theory that explains phenomena of the solar cycle as a result of periodic winding and unwinding of the Sun's magnetic field in the solar atmosphere.

Front 27

Limb

Back 27

The apparent edge of the Sun as seen in the sky.

Front 28

Luminosity class

Back 28

The classification of a star of a given spectral type according to its luminosity and density, the classes are supergiant, bright giant, giant, subgiant and main sequence.

Front 29

Light curve

Back 29

A graph that displays variations in the brightness of a star or other astronomical object over time.

Front 30

Red giant

Back 30

A large cool star of high luminosity.

Front 31

Luminosity

Back 31

The rate at which electro magnetic radiation is emitted from a star or other objects.

Front 32

Binary star

Back 32

To stars revolving about each other a double star

Front 33

Hydrogen fusion

Back 33

The thermonuclear fusion of hydrogen to produce helium.