What physical property of a star does the spectral type measure?
What physical property of a star does the spectral type measure?
The modern spectral classification system is so successful that it has hardly been changed since 1943. It is based on just two physical properties that imprint themselves on the spectrum of a star’s light: the star’s surface temperature and atmospheric pressure
Which of the following methods is useful for determining a star’s approximate surface temperature?
Which of the following methods is useful for determining a star’s approximate surface temperature? As few as two brightness measurements at different wavelengths can be used to determine the effective blackbody temperature of a star.
Also Read: Which electron configuration violates the Pauli exclusion principle?
What physical property of a star does the spectral type measure quizlet?
The spectral type of a star uniquely determines its color. Redder main-sequence stars are fainter on average than bluer main-sequence stars. The spectral type of a star is directly related to its color.
Why does the orbital period of a binary star depend?
Why does the orbital period of a binary star depend on the binary’s mass? Massive stars exert a stronger gravitational attraction on each other, creating smaller orbits with shorter orbital periods.
What does spectral type measure?
The spectral types and sub-classes represent a temperature sequence, from hotter (O stars) to cooler (M stars), and from hotter (subclass 0) to cooler (subclass 9). The temperature defines the star’s color and surface brightness.
How is a star’s spectral type related to its surface temperature and color?
Spectral types are a way of classifying stars according to their color or what spectral lines we see in their light. The spectral types run OBAFGKM, where O stars are the hottest and M are the coolest. Hotter stars look bluer to us, and cooler stars look redder.
What properties of a star can we directly measure?
Directly Observed Properties -x26gt; distance, absolute brightness and luminosity, size, mass, composition, color and temperature, rotation (Arny ch.12.3), magnetic field
What basic property of a star determines its color and thus its spectral type?
Based on this, what basic property of a star determines its color (and thus its spectral type)? Temperature.
What is the most accurate way to determine the surface temperature of a star?
To the extent that Stellar spectra look like blackbodies, the temperature of a star can also be measured amazingly accurately by recording the brightness in two different filters. To get a stellar temperature: Measure the brightness of a star through two filters and compare the ratio of red to blue light.
How do we estimate the surface temperature of a star quizlet?
The way astronomers determine the surface temperature of a star which is determined by the spectral lines present in a stars spectrum.
How do astronomers measure the temperature of a star?
Astronomers are able to measure the temperatures of the surfaces of stars by comparing their spectra to the spectrum of a black body. A black body is one that entirely absorbs all radiation that strikes it. Astronomers determine the black body spectrum which most closely matches the spectrum of the star in question.
How do we typically determine the radius of a star quizlet?
The radius of a star can be indirectly determined if the star’s distance and luminosity are known. Astronomers can distinguish between main-sequence and giant stars purely by spectroscopic means.
What physical property of a star does the spectral type in measure?
The spectral types and sub-classes represent a temperature sequence, from hotter (O stars) to cooler (M stars), and from hotter (subclass 0) to cooler (subclass 9). The temperature defines the star’s color and surface brightness.
What is the spectral type of star a quizlet?
Star A is a main sequence star of spectral type F2 and star B is a white dwarf of spectral type B4. Which statement is true ? What physical property of a star does the spectral type measure ?
What are some of the physical properties of stars quizlet?
Terms in this set (25)
- stellar properties. there are six important properties of stars.
- distance. measure parallax for closer stars.
- effective temperature (T) determined from continuous spectrum (blackbody curve), wien’s law.
- luminosity (L)
- chemical composition.
- radius (R)
- mass (M)
- closest star.
What determines the characteristic spectra of stars quizlet?
The temperature of a star’s photosphere determines the pattern of spectral lines that we see. At the sun’s temperature, hydrogen lines are weaker in the visible light part of the spectrum.
Why does the orbital period of a binary star system depend on the masses of both stars if the mass of the stars increases what happens to the orbital period?
Why does the orbital period of a binary star depend on its mass? Greater mass more gravitational attraction faster orbits smaller orbital period.
Why does the luminosity of a star depend on both its radius and its temperature quizlet?
Why does the luminosity of a star depend on both its radius and its temperature? The luminosity of a star depends on temperature and radius because a star’s luminosity is proportional to its surface area. A big hot star will be very luminous but a small hot star will not be as luminous.
Why don’t astronomers know the inclination of a spectroscopic binary How do they know the inclination of an eclipsing binary?
The stars in a spectroscopic binary system are not visible individually so the inclination cannot be measured. How do they know the inclination of an eclipsing binary? In an eclipsing binary, the plane of the orbit is inclined to be nearly edge-on to Earth and so the inclination is measurable.
How do the masses of stars along the main sequence illustrate the mass luminosity relation?
When the luminosity of main sequence stars is plotted against their masses, we observe a massu2010luminosity relationship, approximately of the form L u221d M 3.5 (see Figure ). In other words, doubling the mass of a main sequence star produces an increase in luminosity by a factor 2 3.5 11 times.
What does spectral type show?
a category for classifying a star, as A star or G star, according to features of its spectrum, as its shape as a function of temperature and wavelength and its absorption spectrum, that indicate the surface temperature of the star and the presence of particular atoms or molecules in its outer layers: principal types
What does spectral class measure?
The spectral class of a star is a short code primarily summarizing the ionization state, giving an objective measure of the photosphere’s temperature.
What are spectral types based on?
The generally accepted system of stellar classification is a combination of two classification schemes: the Harvard system, which is based on the star’s surface temperature, and the MK system, which is based on the star’s luminosity.
What does spectral class describe specifically?
(classification of stars based upon spectral features) A star’s spectral type, indicated by its spectral class letter-code with a single-digit appended (e.g., G2), is a classification based upon the star’s spectral features and the temperatures associated with those features
How does a star’s temperature relate to its spectral type?
Each spectral type is divided into 10 subclasses, A0, A1, A2, A9 etc. The spectral types and sub-classes represent a temperature sequence, from hotter (O stars) to cooler (M stars), and from hotter (subclass 0) to cooler (subclass 9). The temperature defines the star’s color and surface brightness.
Read More Essays
