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Stellar Classification and HR Diagram Quiz

10 Questions

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Stellar Classification and HR Diagram Quiz

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Questions and Answers

What is the subclassification for supergiant stars?

IIa or IIb

IIIa or IIIb

Ia or Ib (correct)

IVa or IVb

What is the key indicator used to assess the age of star clusters?

Color index

Distance from Earth

Luminosity in solar units

Turnoff point on the main sequence (correct)

What is the point of entry to the main sequence called?

Post-main sequence

Zero age main sequence (ZAMS) (correct)

Protostar stage

Supergiant stage

What are the stars in a star cluster like in terms of age and distance?

Same age and about the same distance from Earth Signup and view all the answers

What is the conventional way to denote stars?

Spectral class followed by luminosity class Roman numerals Signup and view all the answers

What does the y-axis of the Hertzsprung-Russell diagram represent?

Luminosity in units of the Sun’s luminosity Signup and view all the answers

How are stellar colors determined?

By employing a method of determining their temperature via filters Signup and view all the answers

What is the significance of the Hubble redshift in the context of star classification?

It contributed to the understanding of the existence of other galaxies Signup and view all the answers

What is the purpose of the B-V color index?

To derive the temperature of a star Signup and view all the answers

When were the classes L and T added to the classical Harvard sequence for star classification?

In 1999 Signup and view all the answers

Study Notes

Supergiant Stars

Subclassification of supergiant stars is based on luminosity classes (Ia, Iab, Ib)

Star Clusters

Age of star clusters is assessed by main-sequence turn-off point (MSTOP)
Stars in a star cluster are similar in age and distance from the Sun

Star Classification

Conventional way to denote stars is by a combination of letters and numbers (e.g., HD 123456)
Stars enter the main sequence at the Zero-Age Main Sequence (ZAMS)

Hertzsprung-Russell Diagram

Y-axis of the H-R diagram represents luminosity or absolute magnitude

Stellar Colors

Stellar colors are determined by the surface temperature of the star
Colors are typically measured using a color index, such as B-V (blue minus visual)

Hubble Redshift

Hubble redshift is a significant indicator of a star's recession velocity, which is used in star classification

B-V Color Index

B-V color index is a measure of a star's surface temperature and is used to classify stars

Harvard Sequence

Classes L and T were added to the classical Harvard sequence for star classification in the 1990s and 2000s

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Description

Test your knowledge of stellar classification and the Hertzsprung‐Russell diagram in this quiz. Explore the significance of spectral differences and the evolution of our understanding of stars throughout the twentieth century.