One of the basic properties used to characterize stars, luminosity is defined as the total energy radiated by a star each second, at all wavelengths.
A measure of the rate of energy flowing from a source, such as a galaxy, star, or light bulb. Luminosity tells astronomers how fast energy "leaks" from the star. It is a measure of power, and it is measured in units called watts. Given the luminosity of a star, an astronomer can calculate the distance to the star by measuring the star's brightness. Luminosity is also related to temperature, mass and size of a star.
of a star depends upon the area of the star's surface (opaque radiating layer of gases) and upon the fourth power of its surface temperature. The luminosity of a star is a measure of its energy output, it can be known directly, as opposed to inferred, only if the star's distance can be measured.
The brightness of an area determined by the amount of light it reflects or emits.
the total radiant energy leaving a body per second.
the rate at which a star or other object emits energy, usually in the form of electromagnetic radiation.
A measure of a stars power output, often measured in watts. Sometimes called intrinsic or absolute brightness.
The amount of light energy output per unit time by an object.
The amount of radiation emitted by a star or celestial object in a given time.
the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"
the amount of energy radiated per second by a body. For example, the wattage of a light bulb defines its luminosity. Stellar luminosity is usually measured in units of the Sun's luminosity, approximately 4X1026 watts.
the measure of the absolute brightness of a star. Luminosity has much to do with the amount of power put out by the star as well as the size of the star
The brightness of a source of light or a reflective surface.
This is the total power output of an object such as a star. The Sun's luminosity, LS = 4.0x1026W.
The amount of energy radiated into space per second by a star. The bolometric luminosity is the total amount of radiation at all frequencies; sometimes luminosity is given for a specific band of frequencies (e.g. the visual band).
A value that corresponds to the brightness of colour
The amount of energy a star emits in 1 second.
the amount of energy emitted by an object per second. As with flux, luminosities can be monochromatic, bolometric or integrated over a finite frequency range. Note that astronomers often quote bolometric luminosities in units of the Sun's luminosity (L/Lsun) rather than in watts.
actual brightness of a star; depends on size and temperature
The rate at which light is emitted from an object.
Total power output of a source of radiation, usually measured in units of the sun's luminosity, which is 4X10^26 Watts.
Refers to the brightness of a color. macro A series of keystrokes and mouse clicks that can be abbreviated into a single keystroke or mouse click.
An expression of the true brightness of a star as compared to the Sun. The Sun's luminosity is 1.0 by definition. Sirius, for example, has a luminosity of 23. Rigel has a luminosity of about 50,000.
Gives the total amount of radiation being given off by a star in 1 second.
Absolute brightness. The total energy radiated into space, per second, by a celestial object such as a star.
A value corresponding to the brightness of a color. A yellow street sign photographed at dusk would have low luminance, or luminosity. That same sign, photographed at 2 p.m. on a sunny day, would have high luminosity. If a cloud comes by and covers that bright sun, the yellow in the sign would exhibit medium luminance.
the total amount of light that an object radiates
An object's brightness/lightness. The quantification of an object's luminosity is its luminance.
The number of particles per square-centimeter per second generated in the beams of high energy particle experiments. The higher the luminosity, the greater the number of events produced for study.
The amount of light emitted by a star.
The rate at which a star or other object emits electromagnetic energy into space.
Another word for brightness.
The total amount of energy a star radiates in one second.
Astronomers use this to describe the brightness of an object. It is the total amount of energy produced per second by the object.
The brightness of either a light source or a reflective surface.
The total amount of energy per unit time released by an object.
The total rate at which radiative energy is given off by a celestial body, over all wavelengths; the Sun's luminosity is about 4x1026 watts.
A measure of the rate of energy flowing from a source, like a galaxy, star, or light bulb. Luminosity tells astronomers how fast energy "leaks" from the star. Luminosity is a measure of power divided into units called watts. Given the luminosity of a star, an astronomer can calculate the distance to the star by measuring the star's brightness. Temperature and luminosity are related, but dependent on the mass and size of a star. See also: temperature
the total amount of energy radiated by an object every second.
A measure of the intensity of light emitted by an object.
The rate of electromagnetic energy released from any object, sometimes called the absolute brightness.
Scanners. A value corresponding to the brightness of colour.
The amount of energy radiated into space every second by a celestial object, such as a star. It is closely related to the absolute brightness of a celestial object.
Luminosity is the total brightness of a star (or galaxy). Luminosity is the total amount of energy that a star radiates each second (including all wavelengths of electromagnetic radiation). The Sun is a as a G2V type star.
