Understanding the Hertzsprung-Russell Diagram through Observations

Dec 28, 2024

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Explore the Hertzsprung-Russell diagram based on observational data. Learn about the spectral sequence OBAFGKMLT, temperature variations, and color representations in stars. Understand the luminosity versus brightness and color ratios in different stars.

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Understanding the Hertzsprung-Russell Diagram through Observations

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The Hertzsprung-Russell Diagram (a.k.a. H-R Diagram)

The Hertzsprung-Russell Diagram (a.k.a. H-R Diagram). Star Classification. Stars can be classified in three ways: Size – How massive the star is Temperature – A stars color reveals its temperature. Red stars have a cooler temperature, and blue stars have a warmer temperature.

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Stellar oscillations across the H-R diagram

Stellar oscillations across the H-R diagram. Helioseismology. Larger.  Surface spatial scale . Smaller. Shallower. Millions of independent oscillation frequencies excited simultaneously Each mode samples the interior in a different and complementary way

534 views • 34 slides

Classificagtion of Stars: The H-R diagram

“ The stars are distant and unobtrusive, but bright and enduring as our fairest and most memorable experiences.” Henry David Thoreau (1849). Classificagtion of Stars: The H-R diagram. Are Stars similar to our Sun? How far away are they? Where did they come from? What do they do?

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H-R DIAGRAM

H-R DIAGRAM. HERTSPRUNG-RUSSELL DIAGRAM. The surface temperatures of main sequence stars range from about 3000 K (spectral class M) to over 30,000 K (spectral class O).

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Star Brightness and the H-R Diagram

Star Brightness and the H-R Diagram. A Star’s perceived brightness (how we see it) depends on three things: 1) Temperature of the Star 2) Distance from the Earth 3) Star Magnitude

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The H R Diagram

The H R Diagram. Hertzsprung - Russel. Some stars are very big, others are very small. Some are very hot and some are much cooler. Some are very bright and some are much dimmer. A chart which helps us understand what different types of star there are and how they evolve.

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Lecture 11: The H-R Diagram and Star Clusters

Lecture 11: The H-R Diagram and Star Clusters. by early 20 th century parallaxes (i.e. distances) measured for many nearby stars  knew their M v , + other properties (colour, spectral type)  Hertzsprung (1911) plotted M v versus B – V  Russell (1913) plotted M v versus sp. type

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Asteroseismology across the H-R diagram

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Observational techniques meeting #15

Observational techniques meeting #15. Gamma-ray Astronomy. Main processes: Photoelectric effect – dominant below 1 MeV Compton scattering – 1-5 MeV Pair production – dominant above ~5 Mev. Basics: γ -ray interaction.

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The H-R Diagram

The H-R Diagram. In 1913, the American astronomer Henry Russel plotted the luminosities of stars versus their spectra class (related to the temperature). Similar to work done in 1911 by Danish astronomer Ejnar Hertzsprung They found that the luminosities and temperatures of star are related

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H-R Diagram

H-R Diagram. H-R Diagram. H-R Diagram. H-R Diagram. Where does our Sun plot on the H-R Diagram?. Sun. Temperature. H-R Diagram. H-R Diagram. Where do most stars plot on the H-R diagram – this is also where most stars spend most of there lives?. Main Sequence. Temperature. H-R Diagram.

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H-R Diagram

H-R Diagram. Absolute Bolometric Magnitude. The ABM value includes ALL types of EMR a star emits. The ABM is the absolute magnitude the star would have if we could see all wavelengths. We generally compare the ABM value with that of the Sun, which is a 4.7. Luminosity, Radius, & Temperature.

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h R

SCHEMA DI CALCOLO. d s. R. A. h S. Z. h R. S. h A. P. O. d T. hs = 2,00 m hr = 9.00 m ha = 2,50 m. SR = SO 2 + OR 2. = AS + AR - SR. d. AS = SP 2 + AP 2. dt = 110 m ds = 1,75 m. AR = AZ 2 + RZ 2.

136 views • 1 slides

R-H + Base  R: - + H-Base

Slides 2 through 6 introduce students to the acidity of terminal alkynes compared to other C-H bonds. R-H + Base  R: - + H-Base. hybridization sp 3 sp 2 sp s character is increasing … a. left to right b. right to left c. no change with hybridization.

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H-R diagram and star magnitude

H-R diagram and star magnitude. Star magnitude. Magnitude or luminosity- The brightness of a star. Apparent magnitude demonstration. Absolute vs. Apparent magnitude. Apparent magnitude. Apparent magnitude- how bright a star appears to us fromEarth. Absolute Magnitude. The absolute truth!!!

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The Grouping of Stars in the H-R Diagram

1000 R sun. Sizes scale. 10 R sun. 100 R sun. 1 R sun. The Grouping of Stars in the H-R Diagram. The Major Categories of Stars The Main Sequence , The Supergiants , The Giants , The White Dwarfs . Main Sequence – healthy stars , fusing hydrogen in the core.

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The H-R Diagram

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