The classification of stellar spectra
... Late 1890s: at this time, the energy-level structure of atoms was not known. Stars were classified according to the strength of hydrogen Balmer lines with classes that were assigned a letter from A to O (from the strongest to the weakest). “Henry Draper Catalogue”, published by astronomers at the Ha ...
... Late 1890s: at this time, the energy-level structure of atoms was not known. Stars were classified according to the strength of hydrogen Balmer lines with classes that were assigned a letter from A to O (from the strongest to the weakest). “Henry Draper Catalogue”, published by astronomers at the Ha ...
6 March 2013 Exoplanets and Where to Find Them Professor
... The Galaxy is continually evolving and changing, albeit on the astronomical timescale of millions of years. Within the disc, the spiral arms show where diffuse hydrogen gas clouds have been compressed by density waves, triggering the process of gravitational collapse that leads to the formation of s ...
... The Galaxy is continually evolving and changing, albeit on the astronomical timescale of millions of years. Within the disc, the spiral arms show where diffuse hydrogen gas clouds have been compressed by density waves, triggering the process of gravitational collapse that leads to the formation of s ...
Potential for Life on the Terrestrial Planets
... by hydrogen envelopes or dense hydrogen-rich volatiles containing a few percent of their masses (e.g., Lissauer et al., 2011; Ikoma and Hori, 2012; Lammer et al., 2013). The existance of such envelopes indicates that these planets did not get rid of their nebulabased or outgassed protoatmospheres (K ...
... by hydrogen envelopes or dense hydrogen-rich volatiles containing a few percent of their masses (e.g., Lissauer et al., 2011; Ikoma and Hori, 2012; Lammer et al., 2013). The existance of such envelopes indicates that these planets did not get rid of their nebulabased or outgassed protoatmospheres (K ...
report
... assignments and grouping strategies. An extension would be to follow up this activity with a night sky projection activity. Have the students poke holes in a piece of black construction paper and then have them project a light through the paper and hang Styrofoam balls from the ceiling at the locati ...
... assignments and grouping strategies. An extension would be to follow up this activity with a night sky projection activity. Have the students poke holes in a piece of black construction paper and then have them project a light through the paper and hang Styrofoam balls from the ceiling at the locati ...
DTU 8e Chap 11 Characterizing Stars
... the Doppler effect as the orbits of the stars carry them alternately toward and away from Earth. An eclipsing binary is a system whose orbits are viewed nearly edge on from Earth, so that one star periodically eclipses the other. Detailed information about the stars in an eclipsing binary can be obt ...
... the Doppler effect as the orbits of the stars carry them alternately toward and away from Earth. An eclipsing binary is a system whose orbits are viewed nearly edge on from Earth, so that one star periodically eclipses the other. Detailed information about the stars in an eclipsing binary can be obt ...
Chapter 13
... spend about 30 million years in the protostar phase. Massive O- and B-type stars remain protostars for only tens of thousands of years before joining the main sequence. 5. O and B stars may undergo a period of instability that is more violent than the one for stars of low mass; during this period, t ...
... spend about 30 million years in the protostar phase. Massive O- and B-type stars remain protostars for only tens of thousands of years before joining the main sequence. 5. O and B stars may undergo a period of instability that is more violent than the one for stars of low mass; during this period, t ...
Jan 2017 Newsletter here
... Low in the south are Crux, the Southern Cross, and Beta and Alpha Centauri, often called 'The Pointers'. Alpha Centauri is the closest naked-eye star, 4.3 light years away. Beta Centauri, like most of the stars in Crux, is a blue-giant star hundreds of light years away. Canopus is also very luminous ...
... Low in the south are Crux, the Southern Cross, and Beta and Alpha Centauri, often called 'The Pointers'. Alpha Centauri is the closest naked-eye star, 4.3 light years away. Beta Centauri, like most of the stars in Crux, is a blue-giant star hundreds of light years away. Canopus is also very luminous ...
More on Stars and the Sky
... Why does the Sun appear to move in the sky with respect to Stars? Can you see the Sun’s annual movement in the sky? Given an example. Why don’t we ever see the planets near the celestial poles? What is the Zodiac? How is it different from the Elliptic? What are the Zodiac ...
... Why does the Sun appear to move in the sky with respect to Stars? Can you see the Sun’s annual movement in the sky? Given an example. Why don’t we ever see the planets near the celestial poles? What is the Zodiac? How is it different from the Elliptic? What are the Zodiac ...
Leaving the Main Sequence
... million K for He burning - in massive star’s cores), then carbon, oxygen, etc. The most massive stars will have cores of iron. Nothing past iron is created. (To create iron ...
... million K for He burning - in massive star’s cores), then carbon, oxygen, etc. The most massive stars will have cores of iron. Nothing past iron is created. (To create iron ...
doc
... 7. What are the different types of waves in the electromagnetic spectrum? 8. How do we study the x-rays emitted from black holes? 9. Which 2 wave types can be detected by earth-based telescopes? ...
... 7. What are the different types of waves in the electromagnetic spectrum? 8. How do we study the x-rays emitted from black holes? 9. Which 2 wave types can be detected by earth-based telescopes? ...
The Sun and other Stars
... Particular atoms absorb particular wavelengths. – Allows us to determine stellar composition. ...
... Particular atoms absorb particular wavelengths. – Allows us to determine stellar composition. ...
Chap. 4: Gravitation and the Waltz of the Planets
... Note (added on Sep. 25, 2006): this ppt file contains the lecture note for the whole chap. 4. Section 4.1- 4.4 was taught on Sep. 18, 2006, and the other section 4.5 – 4.8 was taught on Sep. 25, 2006 ...
... Note (added on Sep. 25, 2006): this ppt file contains the lecture note for the whole chap. 4. Section 4.1- 4.4 was taught on Sep. 18, 2006, and the other section 4.5 – 4.8 was taught on Sep. 25, 2006 ...
Constellations and Distances to Stars
... and look at one finger first with your left eye only and then with your right eye only. Now try doing the same thing with your finger closer to your face • What did you observe? ...
... and look at one finger first with your left eye only and then with your right eye only. Now try doing the same thing with your finger closer to your face • What did you observe? ...
Astronomy and Survey of Information
... only a determination of the joint product of mass and the sine of the angle of inclination relative to the line of sight is possible. • Therefore, without additional information regarding the angle of inclination, the mass can only be inferred in a statistical sense. • In the case of eclipsing binar ...
... only a determination of the joint product of mass and the sine of the angle of inclination relative to the line of sight is possible. • Therefore, without additional information regarding the angle of inclination, the mass can only be inferred in a statistical sense. • In the case of eclipsing binar ...
THE LIFE CYCLES OF STARS (3)
... Illust Fraunhofer spectrum Fraunhofer found dark lines crossing the sun's spectrum. He was not the first to see them but was the first to catalogue them. He named them A,B,C,D,……. He did not know what caused them. These dark lines mean something. We now know each one is caused by some element in the ...
... Illust Fraunhofer spectrum Fraunhofer found dark lines crossing the sun's spectrum. He was not the first to see them but was the first to catalogue them. He named them A,B,C,D,……. He did not know what caused them. These dark lines mean something. We now know each one is caused by some element in the ...
Transit of Venus
... All these objects are gravitationally bound to the Sun and revolve around it. Planets are very small compared to the space between them. The size of the astronomical objects can vary over a large range… ...
... All these objects are gravitationally bound to the Sun and revolve around it. Planets are very small compared to the space between them. The size of the astronomical objects can vary over a large range… ...
Chapter 11
... a. About 40 weeks. b. About 30,000 years. c. About 30 million years. d. About 1 billion years. e. About 5 billion years. ...
... a. About 40 weeks. b. About 30,000 years. c. About 30 million years. d. About 1 billion years. e. About 5 billion years. ...
The ExOoS Mission - Extraterrestrial Octopus on Steroids
... lakes such as Rio tinto in Spain, to the atmosphere or the deep earth (Harrison et al. 2013). This fact, linked to the day-to-day increasing discovery of iso-planets, raises the need of searching for life in the outer space and the probability to succeed on it (Schneider et al. 2010; Seager et al. 2 ...
... lakes such as Rio tinto in Spain, to the atmosphere or the deep earth (Harrison et al. 2013). This fact, linked to the day-to-day increasing discovery of iso-planets, raises the need of searching for life in the outer space and the probability to succeed on it (Schneider et al. 2010; Seager et al. 2 ...
Star Formation - University of Redlands
... • Bigger clumps have more mass and attract more matter. • Planetesimals are the building blocks of the planets. Orion Nebula – Copyright O’Dell and Wong ...
... • Bigger clumps have more mass and attract more matter. • Planetesimals are the building blocks of the planets. Orion Nebula – Copyright O’Dell and Wong ...
PPT - Yale University
... Standard accretion disks become inefficient and unstable at radii > 0.1 pc, so if gas is to get into such a region from a galactic bulge, its angular momentum must be reduced by at least 3 orders of magnitude in some other way. ...
... Standard accretion disks become inefficient and unstable at radii > 0.1 pc, so if gas is to get into such a region from a galactic bulge, its angular momentum must be reduced by at least 3 orders of magnitude in some other way. ...
