parallax
3.33
Grouping stars by brightness
there are two separate ways that astronomers measure the brightness of a start, there is actuall and aparent brightness. In apparent brightness, the measure how bright it looks to all the humans on Earth. However, the actual brightness of a star is different. Say a star is really, really bright, but really far away. That star would look preety dim. Or if a star is not so bright, but really close, like the Sun. The actuall brightness of a star is harder to measure, but is possible by use of waves and stuff like that, I don't know too much about actuall brightness
Scientists actually use two measurements to identify a star's brightness. One is luminosity, or the energy that star puts out. Another is magnitude, or the amount of light a star puts out.
Yes, stars are luminous.Stars emit energy in the form of light. The immense temperature and pressure inside stars fuses atoms together in a process called nuclear fusion. This releases energy, largely in the form of light and heat. Some stars shine more brightly than others and this brightness is known as the star's magnitude. There are two types of magnitude.1. Apparent magnitude - This is a measure of how bright the Star appears to us (this does not take into account how far away from us the star is).2. Absolute magnitude - A measure of how bright the star actually is once we allow for distance (if it is further away it will appear to be less bright to us but this scale compensates for this).
Stars' brightness and temperature are typically represented on a Hertzsprung-Russell (H-R) diagram. An average star like the Sun would be located on the "Main Sequence" portion of the graph, where brightness increases as temperature increases.
The brightness is very similar to the temperature, the brightness relies on the temperature
Information on millions of stars shows that there is a relationship between temperature and brightness. Surface temperature is measured in degrees C and brightness is measured in absolute magnitude (the star's brightness at a standard distance). If all the stars are plotted on a graph of temperature against absolute magnitude, called a Hertzsprung-Russell diagram, very many of them lie close to a straight line that is called the Main Sequence. There are some stars that do not lie on the Main Sequence, notably the red giants that are very bright despite having a relatively low temperature. The Sun is right in the middle of the Main Sequence showing it is an average star in the middle of its life and very stable.
The Hertzsprung-Russell (HR) diagram is a graph that shows the relationship between a star's magnitude (luminosity) and temperature. It plots stars based on their color (temperature) and brightness (magnitude), allowing astronomers to classify stars and understand their evolutionary stage.
Brightness tells you the temperature and mostly temperature would tell the brightness of the star that we are talking about.
Temperature of stars is indicated by their color, with blue stars being hotter than red stars. Brightness of stars is indicated by their luminosity, which is how much light a star emits.
color
its color :)
Their Color!(:
The Hertzsprung-Russell diagram is a scatter graph of known stars. It shows the absolute magnitudes (actual brightness at a set distance) versus the spectral type or classification (which is effectively what their temperature is). Stars, when plotted onto this graph, tend to fall into set patterns. The position of a star within a pattern (or sequence) can give further information, such as how old the star is.
Size and temperature determine the brightness of stars.
No, the Hertzsprung-Russell (H-R) diagram classifies stars based on their luminosity (brightness) and temperature. It shows the relationship between a star's temperature and luminosity, allowing astronomers to categorize stars into different groups based on their color, size, and stage of evolution.