HR Diagram. Characteristics of Stars Temperature/Color Mass Luminosity Absolute Magnitude...

HR Diagram

Characteristics of Stars

Temperature/Color

Luminosity

• Absolute Magnitude• Apparent Magnitude

The Spectral Sequence

Bluest Reddest

Hottest Coolest50,000K 1300K

O B A F G K M L

Oh Boy, an F grade kills me, Louis!

The mass of a star determines the length of its life cycle (how long

will it burn).

Sun-like StarsUp to 1.5 times the mass of the Sun

Huge StarFrom 1.5 to 3 times the mass of the Sun

Giant Star Over 3 times the mass of the Sun

Stellar Nebula(nursery)

Sun/main sequence star

Massive Star ( Huge & Giant)

Red Giant

Red Supergiant

Planetary Nebula

Supernova

White Dwarf

Neutron Star

Black Hole

Protostar

Star sizeDistance from EarthStar temperature

Variables which affect a star’s brightness:

Absolute Magnitude

• Apparent Brightness: The amount of light received on Earth from a star.

Apparent Magnitudevs.

• Actual Brightness: How large and hot a star is in relation to other stars.

Which star looks like it is giving off more light?

• But, which star is actually giving off more light?

Hotter Stars

Cooler Stars

Luminous/Brighter Stars

Dim Stars

O B A F G K M

• Life Cycle of Stars Interactive Investigation http://aspire.cosmic-ray.org/labs/star_life/starlife_main.html

• HR Diagram Interacative Lab http://aspire.cosmic-ray.org/labs/star_life/hr_interactive.html

• Stellar Evolution/H-R Diagram Simulationhttp://instruct1.cit.cornell.edu/courses/astro101/java/evolve/evolve.htm

• Astronomy Place Tutorialshttp://media.pearsoncmg.com/bc/bc_bennett_cosmicpers_2/medialib/tutorials/index.html

HR Diagram. Characteristics of Stars Temperature/Color Mass Luminosity Absolute Magnitude...

Documents

Transcript of HR Diagram. Characteristics of Stars Temperature/Color Mass Luminosity Absolute Magnitude...

The Magnitude Scale A measure of the apparent brightness Logarithmic scale Notation: 1 m.4 (smaller brighter) Originally six groupings –1 st magnitude.

Binary stars and clusters Chapter 11. Review Properties of stars –apparent brightness (apparent magnitude) measure energy/area/second –luminosity (absolute.

The luminosity-dependent evolution of the radio luminosity function

Class 4 : Basic properties of stars Distance to stars Parallax method for determining distance Definition of the “parsec” Flux, luminosity, magnitude and.

8.4 Light & Telescopes. Do Now! 1.What is the difference between apparent magnitude and absolute magnitude? 2.What two characteristics of stars does a.

Plate-tectonic analysis of shallow seismicity: Apparent boundary width, beta, corner magnitude, coupled lithosphere thickness, and coupling in 7 tectonic.

Stars and Galaxies. Important Vocabulary Absolute Magnitude How bright a star would look if it were a standard position from Earth. Apparent Magnitude.

Stellar Luminosity

Intensity and Distance Intensity depends on luminosity and distance Inverse-square law discovered by Newton Magnitude system used in astronomy.

Goal: To understand the HR diagram Objectives: 1)To explore the Magnitude scale 2)To understand the differences between Absolute vs Apparent Magnitude.

Longmont Astronomical Society Newsletter · 2019-03-21 · constellation Virgo. It is magnitude -3.9 and is 11 arc sec in apparent size. Mars Mars begins the month with an apparent

Stars and Galaxies Stars and Galaxies BIG Idea: ► The life cycle of every star is determined by its mass, luminosity, magnitude, temperature, and composition.

Stars Flux and Luminosity Brightness of stars and the magnitude scale Absolute magnitude and luminosity Distance modulus Temperature vs heat Temperature.

Star Formation. Classifying Stars The surface temperature of a star T is compared to a black body. –Luminosity L –Radius R The absolute magnitude calculates.

Luminosity measurments roadmap for luminosity determinations relative luminosity monitors

Bayes and the Cosmic Distance Scale10/25/04 5 Bayes and the Cosmic Distance Scale Distances to Cepheid variable stars Convert apparent brightness to luminosity Trigonometric Parallaxes

1. introduction 2. goal of luminosity monitor 3. Structure of BESII Luminosity detector 4. Calculation of the luminosity 5. MC of luminosity detector 6.

Luminosity Tuning

Magnitude! Copy the following words into your vocab section. Copy the following words into your vocab section. Apparent Magnitude: How bright a star appears.

Chapter 11 Surveying the Stars. I.Parallax and distance. II.Luminosity and brightness Apparent Brightness (ignore “magnitude system” in book) Absolute.