The Hubble Mission - Indiana University Astronomy
... The period of pulsation of the Cepheids is related to their brightness, and allows a measurement of the distance – 108 million light years Observations like these tell us the Hubble Constant, the relation between the distances to galaxies and their recession velocities. A Hubble Constant of 70 km s- ...
... The period of pulsation of the Cepheids is related to their brightness, and allows a measurement of the distance – 108 million light years Observations like these tell us the Hubble Constant, the relation between the distances to galaxies and their recession velocities. A Hubble Constant of 70 km s- ...
LAB #6 - GEOCITIES.ws
... ANSWER ALL PRE-LAB WARMUPS BEFORE COMING TO LAB. You will begin lab with a short quiz on these questions. This exercise will continue with the techniques used by astronomers to determine the fundamental properties of stars. In this exercise we will use these techniques to study the characteristics o ...
... ANSWER ALL PRE-LAB WARMUPS BEFORE COMING TO LAB. You will begin lab with a short quiz on these questions. This exercise will continue with the techniques used by astronomers to determine the fundamental properties of stars. In this exercise we will use these techniques to study the characteristics o ...
The Sun and Stars The Sun is a typical star with a mass of about 2
... I is measured in Watt/m2 . So, a star that is 10 times farther away appears 100 time less bright. The brightness is sometimes expressed not in Watt/m2 but in magnitudes. The magnitude of Sirius (the brightest star in our sky) is -1.46, of Canopus -0.72, of Vega 0.04, of Deneb 1.26,. . . more or less ...
... I is measured in Watt/m2 . So, a star that is 10 times farther away appears 100 time less bright. The brightness is sometimes expressed not in Watt/m2 but in magnitudes. The magnitude of Sirius (the brightest star in our sky) is -1.46, of Canopus -0.72, of Vega 0.04, of Deneb 1.26,. . . more or less ...
February 16
... star formation is relatively constant, stars must spend about 90% of their lives on the main sequence. ...
... star formation is relatively constant, stars must spend about 90% of their lives on the main sequence. ...
Teaching astrophysics in VCE Physics
... $ The absolute magnitude is also used to describe this quantity. It is the ‘magnitude’ that a star would appear to have if at a distance of 10 pc from us. Sirius has an apparent magnitude of -1.4, and an absolute magnitude of +1.5 (compare the Sun +4.8, that is quite a bit less bright) and luminosit ...
... $ The absolute magnitude is also used to describe this quantity. It is the ‘magnitude’ that a star would appear to have if at a distance of 10 pc from us. Sirius has an apparent magnitude of -1.4, and an absolute magnitude of +1.5 (compare the Sun +4.8, that is quite a bit less bright) and luminosit ...
Formation of the Solar System Chapter 8
... The idea that the solar system was born from the collapse of a cloud of dust and gas for proposed by Immanuel Kant (1755) and by Pierre Simon Laplace 40 years later. During the first part of the 20th century, some proposed that the solar system was the result of a near collision of the Sun with anot ...
... The idea that the solar system was born from the collapse of a cloud of dust and gas for proposed by Immanuel Kant (1755) and by Pierre Simon Laplace 40 years later. During the first part of the 20th century, some proposed that the solar system was the result of a near collision of the Sun with anot ...
Lecture 7 February 9
... *All stars above 6,000 K look more or less white to the human eye because they emit plenty of radiation at all visible wavelengths. ...
... *All stars above 6,000 K look more or less white to the human eye because they emit plenty of radiation at all visible wavelengths. ...
Lives of stars HR
... Stars in the upper right are very large and stars in the lower left are very small. This defines only the SIZE of the star and not the MASS, since the density of stars can be very different. So the branch of stars to the upper right of the MS are giant and supergiant stars. ...
... Stars in the upper right are very large and stars in the lower left are very small. This defines only the SIZE of the star and not the MASS, since the density of stars can be very different. So the branch of stars to the upper right of the MS are giant and supergiant stars. ...
PHYSICS 110: PHYSICS OF EVERYDAY PHENOMENA
... present research fields?” These three astronomy questions form the basis of our gradually more intensive study of the universe. In WHAT we examine what we can see in the sky first without optical aids and consider the atmospherically, geographically, and seasonally limitations to develop a map of ou ...
... present research fields?” These three astronomy questions form the basis of our gradually more intensive study of the universe. In WHAT we examine what we can see in the sky first without optical aids and consider the atmospherically, geographically, and seasonally limitations to develop a map of ou ...
Student Handout - Mr. vallee`s Class Site
... and ________ moved through the sky in a different way than the stars. They noticed that, over time, these objects appeared to move with respect to the __________________________. 10. Because of the ___________________________ and its __________ around the Sun, it is convenient to divide the constell ...
... and ________ moved through the sky in a different way than the stars. They noticed that, over time, these objects appeared to move with respect to the __________________________. 10. Because of the ___________________________ and its __________ around the Sun, it is convenient to divide the constell ...
Teacher Guide
... A Cepheid variable star that appears very bright, but has a short period, is relatively close to our solar system. ...
... A Cepheid variable star that appears very bright, but has a short period, is relatively close to our solar system. ...
• This chapter concentrates on five goals:
... • Two, in the surface layers of stars hotter than about 20,000 K, there are many violent collisions between atoms. • These excite electrons to high energy levels or knock the electrons completely out of most atoms—so they become ionized. – In this case, few hydrogen atoms will have electrons in the ...
... • Two, in the surface layers of stars hotter than about 20,000 K, there are many violent collisions between atoms. • These excite electrons to high energy levels or knock the electrons completely out of most atoms—so they become ionized. – In this case, few hydrogen atoms will have electrons in the ...
! • Supermassive Black Holes (SMBH) at Work: Effects of
... type galaxies – Detect onset of winds – decrease in SZ signal – Detect hot halos of spirals!! see Andersen+11;Bogdan+13a,13b ...
... type galaxies – Detect onset of winds – decrease in SZ signal – Detect hot halos of spirals!! see Andersen+11;Bogdan+13a,13b ...
Barium Stars Observed with the Coude Echelle Spectrometer
... scaling to very different exposures). Thus, if one wants to fully exploit the high photometric accuracy the reticon is capable of, one has to spend quite some time on dark integrations. Nevertheless, the CES/reticon system is very efficient and versatile, and it makes much fun to work with it. High- ...
... scaling to very different exposures). Thus, if one wants to fully exploit the high photometric accuracy the reticon is capable of, one has to spend quite some time on dark integrations. Nevertheless, the CES/reticon system is very efficient and versatile, and it makes much fun to work with it. High- ...
Birth of Stars - High Energy Physics at Wayne State
... shock waves can trigger collapse by compressing the gas clouds into clump the explosion of a nearby massive star – supernova gravity from nearby stars or groups of stars gravity pulls more matter to form sufficiently massive clumps whatever the reason, the result is the same: gas clumps compress to ...
... shock waves can trigger collapse by compressing the gas clouds into clump the explosion of a nearby massive star – supernova gravity from nearby stars or groups of stars gravity pulls more matter to form sufficiently massive clumps whatever the reason, the result is the same: gas clumps compress to ...
Day 2
... away its store of thermal energy because of its small surface area. The white dwarf will slowly move down and to the right in the H-R Diagram as it cools until it fades from view as a "black dwarf" ...
... away its store of thermal energy because of its small surface area. The white dwarf will slowly move down and to the right in the H-R Diagram as it cools until it fades from view as a "black dwarf" ...
Microsoft Power Point version
... temperature dictates the energy states of electrons in atoms temperature dictates the types of ions or molecules which exist this, in turn, determines the number and relative strengths of absorption lines in the star’s spectrum this fact was discovered by Cecilia Payne-Gaposchkin in 1925 ...
... temperature dictates the energy states of electrons in atoms temperature dictates the types of ions or molecules which exist this, in turn, determines the number and relative strengths of absorption lines in the star’s spectrum this fact was discovered by Cecilia Payne-Gaposchkin in 1925 ...
PowerPoint Presentation - 21. Galaxy Evolution
... protogalactic cloud collapsed into a disk • stars which formed in the disk orbit on the same plane in the same direction • low content of heavy elements in halo stars implies that they formed before the star–gas– star cycle could significantly enrich the ISM ...
... protogalactic cloud collapsed into a disk • stars which formed in the disk orbit on the same plane in the same direction • low content of heavy elements in halo stars implies that they formed before the star–gas– star cycle could significantly enrich the ISM ...
Dark Matter -24-------------------------------~-----------R-E-S-O-N-A-N-C
... There have been three reactions to the discovery of dark matter: (i) It doesn't exist; the law of gravitation must be modified so that the stars are all there is to a galaxy. (ii) Dark matter exists, but consists entirely of ord~nary matter - Jupiter-like objects called broum dwarfs that are not mas ...
... There have been three reactions to the discovery of dark matter: (i) It doesn't exist; the law of gravitation must be modified so that the stars are all there is to a galaxy. (ii) Dark matter exists, but consists entirely of ord~nary matter - Jupiter-like objects called broum dwarfs that are not mas ...
Figure 1. Map showing the region of the Fourth Quadrant selected
... In these turbulent models (see MacLow & Klessen 2004) supersonic turbulence is driven on large scales (tens of parsecs or more) and generates turbulence on smaller scales via an energy cascade. The supersonic gas motions quickly compress regions of gas, which may then undergo collapse in these dense ...
... In these turbulent models (see MacLow & Klessen 2004) supersonic turbulence is driven on large scales (tens of parsecs or more) and generates turbulence on smaller scales via an energy cascade. The supersonic gas motions quickly compress regions of gas, which may then undergo collapse in these dense ...
Circular Polarization in Star- Formation Regions
... type that would be expected to be a source of ultraviolet (UV) light, the Crab Nebula and its pulsar, shows no CP either in the nebula (10) or in the pulsar (11), nor is any expected from synchrotron radiation under these conditions (12). Furthermore, the flat power law spectrum of such a source wil ...
... type that would be expected to be a source of ultraviolet (UV) light, the Crab Nebula and its pulsar, shows no CP either in the nebula (10) or in the pulsar (11), nor is any expected from synchrotron radiation under these conditions (12). Furthermore, the flat power law spectrum of such a source wil ...
Thursday October 1 - Montana State University
... It’s hard to read your protractor when it is dark outside. The parallax angle is very small because the stars are so far away. We can’t see any of the same stars six months apart. It actually is not difficult! ...
... It’s hard to read your protractor when it is dark outside. The parallax angle is very small because the stars are so far away. We can’t see any of the same stars six months apart. It actually is not difficult! ...
H II region
An H II region is a large, low-density cloud of partially ionized gas in which star formation has recently taken place. The short-lived blue stars forged in these regions emit copious amounts of ultraviolet light that ionize the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds. The first known H II region was the Orion Nebula, which was discovered in 1610 by Nicolas-Claude Fabri de Peiresc.H II regions are named for the large amount of ionised atomic hydrogen they contain, referred to as H II, pronounced H-two by astronomers (an H I region being neutral atomic hydrogen, and H2 being molecular hydrogen). Such regions have extremely diverse shapes, because the distribution of the stars and gas inside them is irregular. They often appear clumpy and filamentary, sometimes showing bizarre shapes such as the Horsehead Nebula. H II regions may give birth to thousands of stars over a period of several million years. In the end, supernova explosions and strong stellar winds from the most massive stars in the resulting star cluster will disperse the gases of the H II region, leaving behind a cluster of birthed stars such as the Pleiades.H II regions can be seen to considerable distances in the universe, and the study of extragalactic H II regions is important in determining the distance and chemical composition of other galaxies. Spiral and irregular galaxies contain many H II regions, while elliptical galaxies are almost devoid of them. In the spiral galaxies, including the Milky Way, H II regions are concentrated in the spiral arms, while in the irregular galaxies they are distributed chaotically. Some galaxies contain huge H II regions, which may contain tens of thousands of stars. Examples include the 30 Doradus region in the Large Magellanic Cloud and NGC 604 in the Triangulum Galaxy.