the spectral class of a star is related to its

Stars are also grouped into spectral types or classes by color. To discriminate between a giant and a dwarf star of the same spectral class astronomers use: Definition. Expert Answer . Each class is subdivided into 10 subclasses, numbered from 0 to 9 (our Sun is a G2 star with characteristics part-way between G and F). Spectral class is used as a method of categorizing stars. They generally stay roughly the same temperature/spectral class while on the main sequence, though they slowly get larger and brighter. c. mass. The spectral class of a star is related to its: a. luminosity b. brightness c. radius d. mass e. temperature. Stars hotter than Vega will have a negative colour index and appear more bluish. From the vertical axis at the right, we get the intrinsic brightness (luminosity) of the star when compared to the Sun. What force holds planets in their orbits? d. distance. Last Post; Apr 28, 2016; Replies 4 Views 2K. The luminosity of white dwarfs also depends rather strongly on spectral class. Question Get Answer. Select one: a. temperature. Also, the color of the star is directly related to its surface temperature, beginning from red, to orange, to yellow, to yellow-white, to white, to blue-white, and then to blue. Last Post; Jan 24, 2010; Replies 8 Views 2K. But when a star starts to die, its spectral class and luminosity changes. 23. Add a few letters and numbers like " G 2V" or " B 5IV-Vshnne" and the star suddenly gains personality and character. Magnitude. Stellar masses. Last Post; Apr 9, … (a) air resistance (b) electromagnetic (c) friction (d) gravity 5. 4. The Sun is a class G star; these are yellow, with surface temperatures of 5,000–6,000 K. Class K stars are yellow to orange, at about 3,500–5,000 K, and M stars are red, at about 3,000 K, with titanium oxide prominent in their spectra. 8 - If a star has an apparent magnitude equal to its... Ch. Spectral types are named with a letter. 13.6 - Understand how a star’s colour and spectral type are related to its surface temperature. Any star's mass can be related to its density as well. The spectral type of stars has an OBAFGKM class, along with a number, from 0 to 9. The temperature of each spectral class is then further subdivided from hot to cool by the simple addition of a number, where 0 is the hottest and 9 the coolest. An A-type main-sequence star (A V) or A dwarf star is a main-sequence (hydrogen-burning) star of spectral type A and luminosity class V. These stars have spectra which are defined by strong hydrogen Balmer absorption lines. Related to spectral types: HR diagram. (a) star A (b) The two stars are the same distance. Stellar Spectral Types Stars can be classified by their surface temperatures as determined from Wien's Displacement Law, but this poses practical difficulties for distant stars. There is a fair amount of scatter around the main sequence so it is likely that some stars a few spectral subtypes away may have absolute magnitudes near zero. Since our Sun is a star, we can classify it according to its spectral and luminosity classes. Stars are also classified by luminosity class. Which star in the figure below is closest to Earth? Luminosity classes are determined from spectral features and photometric measurements, coupled with information regarding the distance to the star and theamount of extinction of the starlight from interstellar material. This brightness, or flux is related to the amount of light emitted by the source, the true luminosity, by flux or brightness = f = L / (4 π D 2) where D in this equation is the distance to the object. The spectral type (but not luminosity class) of a star can be estimated by photometric measures of its flux through specific filters or narrowband sensors. The Sun is an example of a main sequence star, of spectroscopic type G2. Because a star’s temperature determines which absorption lines are present in its spectrum, these spectral classes are a measure of its surface temperature. where d is the distance to the star. The luminosity (L) and brightness (B) are related by the Inverse Square Law . This question hasn't been answered yet Ask an expert. Once the star's position on the HR Diagram is identified by the intersection of its spectral class and luminosity class, one can read off its absolute magnitude. 8 - terrnine the temperatures of the following stars... Ch. Based on the position of a star on the H-R diagram, we can find out its luminosity, color, and spectral class. The full spectral specification of a star includes its luminosity class. Note that the table there only covers the main sequence, it does not cover other luminosity classes that may also fall into this range, e.g. There are seven standard spectral classes. The luminosity class of the star pins down the vertical position of the star on the HR Diagram. Effective temperatures are closely related to spectral type and range from about 40,000 K for hot O-type stars, through 5,800 K for stars like the Sun, to about 300 K for brown dwarfs. The Hertzsprung -Russell (H-R) Diagram is a graph that plots stars color (spectral type or surface temperature) vs. its luminosity (intrinsic brightness or absolute magnitude). brightness c . The seven main types are M, K, G, F, A, B and O. M stars are the coldest stars and O stars are the hottest. e. None of these . Last Post; Mar 27, 2015; Replies 3 Views 1K. Astronomers categorise these by temperature and their chemical composition that they obtain from a star’s stellar spectrum. On it, astronomers plot stars' color, temperature, luminosity, spectral type, and evolutionary stage. subgiants and giants. Use... Ch. The star's luminosity depends on: Definition. Previous question Next question Get more help from Chegg. Each star is different and there are many different types of stars. or n any of various groups into which stars are classified according to characteristic spectral lines and bands. Subject: Physics, Science. radius d . The temperature of the stars decreases from blue (very hot) to red (less hot). The high content of metals is believed to be mainly present in the surface layers, not in the entire star. I Star Radius & Mass from Spectral Class, B-V, Luminosity. The Hertzsprung-Russell diagram uniquely describes: Definition. The word 'luminosity' is used because the more luminous a star is, the larger its size has to be. 8 - To which spectral classes do the stars in Problem... Ch. A diagram of spectral types with information on temperature, color and what elements and compounds show up in each spectral class. 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