March 2010 - Pomona Valley Amateur Astronomers
... million light years away. That's a long was for any alien to travel. This telescopic object, discovered by E. E. Barnard in 1881, is one of a dozen satellite dwarf galaxies near our Milky Way. They include the more visible Large and Small Magellanic clouds, first charted by the explorer Magellan whe ...
... million light years away. That's a long was for any alien to travel. This telescopic object, discovered by E. E. Barnard in 1881, is one of a dozen satellite dwarf galaxies near our Milky Way. They include the more visible Large and Small Magellanic clouds, first charted by the explorer Magellan whe ...
HR Diagram and Stellar Fusion
... H-R Diagram named for… • …Ejnar Hertzsprung and H. N. Russell, graph (see illustration) showing the luminosity of a star as a function of its surface temperature. The luminosity, or absolute magnitude, increases upwards on the vertical axis; the temperature (or some temperature-dependent characteri ...
... H-R Diagram named for… • …Ejnar Hertzsprung and H. N. Russell, graph (see illustration) showing the luminosity of a star as a function of its surface temperature. The luminosity, or absolute magnitude, increases upwards on the vertical axis; the temperature (or some temperature-dependent characteri ...
Slide 1
... • A. It is a cloud-like halo that surrounds the disks of spiral galaxies • B. It was a term used historically to refer to any galaxy • C. It is a cloud of hydrogen gas that we detect by looking at light from quasars • D. It is a cloud of matter that contracts to become a galaxy ...
... • A. It is a cloud-like halo that surrounds the disks of spiral galaxies • B. It was a term used historically to refer to any galaxy • C. It is a cloud of hydrogen gas that we detect by looking at light from quasars • D. It is a cloud of matter that contracts to become a galaxy ...
Candles in the Dark
... and is in fact iuseless for measuring distances of more than about 1600 light years. How then can we tell, for example, that M31, the galaxy in Andromeda, is 2.2 million light years away? It would be straight-forward to tell how far away a star was if it was exactly the same brightness as our own Su ...
... and is in fact iuseless for measuring distances of more than about 1600 light years. How then can we tell, for example, that M31, the galaxy in Andromeda, is 2.2 million light years away? It would be straight-forward to tell how far away a star was if it was exactly the same brightness as our own Su ...
Ch 19 Directed Reading
... 18. A star made up of neutrons is called a _____________________________. 19. A spinning neutron star that emits pulses of energy is called a _____________________________. 20. An object so massive and dense that light cannot escape its gravity is called a _____________________________. ...
... 18. A star made up of neutrons is called a _____________________________. 19. A spinning neutron star that emits pulses of energy is called a _____________________________. 20. An object so massive and dense that light cannot escape its gravity is called a _____________________________. ...
Astrophysics by Daniel Yang
... Photometry is the measurement of the brightness of a light source such as a star. Photoelectric techniques are now more common than photographic techniques for a number of reasons. Photographic photometry involves the use of photographic emulsions to record a photograph of a portion of the sky. Once ...
... Photometry is the measurement of the brightness of a light source such as a star. Photoelectric techniques are now more common than photographic techniques for a number of reasons. Photographic photometry involves the use of photographic emulsions to record a photograph of a portion of the sky. Once ...
Galaxies – Island universes
... • Many have later infalling matter which has been pulled on by nearby mass and thus doesn’t fall straight in. It settles into a rotating disk, arranging itself into a flat, roughly circularly orbiting plane of material • This material gradually condenses enough to initiate star formation. Then super ...
... • Many have later infalling matter which has been pulled on by nearby mass and thus doesn’t fall straight in. It settles into a rotating disk, arranging itself into a flat, roughly circularly orbiting plane of material • This material gradually condenses enough to initiate star formation. Then super ...
AS2001 - University of St Andrews
... • Lab measurements: Unique line signature for each element. ...
... • Lab measurements: Unique line signature for each element. ...
Stars
... Dipper, a constellation of stars known as Ursa Major.. The Big Dipper is perhaps the best known group of stars in the northern sky and is easy to distinguish from all others. Also known as the Great Bear, the Big Dipper is located just north of the celestial pole. Knowing how to find the Big Dipper ...
... Dipper, a constellation of stars known as Ursa Major.. The Big Dipper is perhaps the best known group of stars in the northern sky and is easy to distinguish from all others. Also known as the Great Bear, the Big Dipper is located just north of the celestial pole. Knowing how to find the Big Dipper ...
1 pracovni list HR diagram I EN
... 3 Preparation of data for construction of H–R diagram Open the prepared CSV file in an Excel spreadsheet. To construct a H–R diagram you need to know the star’s luminosity (or absolute magnitude) and effective temperature (or spectral type or colour index). From the catalogue it is possible to obta ...
... 3 Preparation of data for construction of H–R diagram Open the prepared CSV file in an Excel spreadsheet. To construct a H–R diagram you need to know the star’s luminosity (or absolute magnitude) and effective temperature (or spectral type or colour index). From the catalogue it is possible to obta ...
The Universe and Galaxies - West Jefferson Local Schools
... might be causing accelerated expansion of the universe ...
... might be causing accelerated expansion of the universe ...
Integrative Studies 410 Our Place in the Universe
... • The orbital plane of the pair almost edge-on to our line of sight • We observe periodic changes in the starlight as one member of the binary passes in front of the other ...
... • The orbital plane of the pair almost edge-on to our line of sight • We observe periodic changes in the starlight as one member of the binary passes in front of the other ...
Section 19.2
... • Stars that are smaller than the sun come in two main categories, dwarfs and neutron stars. • Sirius, the Dog Star, is the largest known white dwarf. ...
... • Stars that are smaller than the sun come in two main categories, dwarfs and neutron stars. • Sirius, the Dog Star, is the largest known white dwarf. ...
Binocular Universe: Summer`s Swan Song
... stars poking through. That was still enough to earn NGC 6910 a place in the Astronomical League’s Binocular Deep Sky Club. Our next stop, NGC 6819, is nestled about 8° west of Sadr and is also a member of the Binocular Deep Sky Club. Shining at 7th magnitude and spanning just 5 arcminutes, this litt ...
... stars poking through. That was still enough to earn NGC 6910 a place in the Astronomical League’s Binocular Deep Sky Club. Our next stop, NGC 6819, is nestled about 8° west of Sadr and is also a member of the Binocular Deep Sky Club. Shining at 7th magnitude and spanning just 5 arcminutes, this litt ...
Mass and composition determine most of the properties of a star
... across the street, which light would appear brighter? You cannot tell by looking in the sky how bright a star truly is. The farther away the star is, the less bright it will appear. ...
... across the street, which light would appear brighter? You cannot tell by looking in the sky how bright a star truly is. The farther away the star is, the less bright it will appear. ...
Lecture 16
... A later scheme, called the B-V Index, classed stars according to a logarithmic ratio of the peak amount of radiation in the blue and violet colors. The current scheme is to class stars according to color in a way which is more or less logarithmically proportional to temperature. In this scheme stars ...
... A later scheme, called the B-V Index, classed stars according to a logarithmic ratio of the peak amount of radiation in the blue and violet colors. The current scheme is to class stars according to color in a way which is more or less logarithmically proportional to temperature. In this scheme stars ...
StarCharacteristics
... across the street, which light would appear brighter? You cannot tell by looking in the sky how bright a star truly is. The farther away the star is, the less bright it will appear. ...
... across the street, which light would appear brighter? You cannot tell by looking in the sky how bright a star truly is. The farther away the star is, the less bright it will appear. ...
Chapter 12
... stars. The preceding chapter told us how stars form, and the next chapter tells us how stars die. This chapter is the heart of the story—how stars live. As always, we accept nothing at face value. We expect theory to be supported by evidence. We expect carefully constructed models to help us underst ...
... stars. The preceding chapter told us how stars form, and the next chapter tells us how stars die. This chapter is the heart of the story—how stars live. As always, we accept nothing at face value. We expect theory to be supported by evidence. We expect carefully constructed models to help us underst ...
MS Word
... parsecs away from the Earth. Do not confuse this with apparent magnitude (denoted by a little m), which is the brightness as seen from the Earth at whatever distance the star happens to be at. Recall how the magnitude scale works. The smaller the magnitude number, the brighter the star. Thus, the to ...
... parsecs away from the Earth. Do not confuse this with apparent magnitude (denoted by a little m), which is the brightness as seen from the Earth at whatever distance the star happens to be at. Recall how the magnitude scale works. The smaller the magnitude number, the brighter the star. Thus, the to ...
Stars and Galaxies
... • Mass of massive stars 6x that of sun • Take same path as medium-sized stars except for after red giant stage they do not become white dwarfs • Carbon atoms continue to fuse creating heavier elements like oxygen & nitrogen • Core of massive star so hot that fusion continues until the heavy element ...
... • Mass of massive stars 6x that of sun • Take same path as medium-sized stars except for after red giant stage they do not become white dwarfs • Carbon atoms continue to fuse creating heavier elements like oxygen & nitrogen • Core of massive star so hot that fusion continues until the heavy element ...
october 2008 - Mahoning Valley Astronomical Society
... try for the brightest-- go for G1. Also known as Mayall II or Andromeda's Globular, it was discovered in 1953 by the astronomers Nicholas Mayall and Olin J. Eggen. G1 consists of 300,000 to 1 million old stars. It lies about 130,000 light years away from its home galaxy M31. From our perspective thi ...
... try for the brightest-- go for G1. Also known as Mayall II or Andromeda's Globular, it was discovered in 1953 by the astronomers Nicholas Mayall and Olin J. Eggen. G1 consists of 300,000 to 1 million old stars. It lies about 130,000 light years away from its home galaxy M31. From our perspective thi ...
Chapter 28 Stars and Their Characteristics
... A Star is a “self-luminous” (it is giving off light as opposed to reflecting it) sphere of gas that is undergoing Nuclear Fusion in its center. ...
... A Star is a “self-luminous” (it is giving off light as opposed to reflecting it) sphere of gas that is undergoing Nuclear Fusion in its center. ...
February 16
... The key to determining the luminosity of a blackbody is knowing its temperature and surface area. The sizes of stars can vary from 0.01 R to 1000 R, where R is the radius of the Sun. ...
... The key to determining the luminosity of a blackbody is knowing its temperature and surface area. The sizes of stars can vary from 0.01 R to 1000 R, where R is the radius of the Sun. ...
Exercise 4
... (b) C > D > E > A > B (Largest m to smallest m, i.e. dimmest to brightest, i.e. least luminous to most luminous since the objects are at the same distance from the Earth) (c) B > A > E > D > C (Using m–M = 5 log d/10, the largest m-M corresponds the farthest star) ...
... (b) C > D > E > A > B (Largest m to smallest m, i.e. dimmest to brightest, i.e. least luminous to most luminous since the objects are at the same distance from the Earth) (c) B > A > E > D > C (Using m–M = 5 log d/10, the largest m-M corresponds the farthest star) ...
Aries (constellation)
Aries is one of the constellations of the zodiac. It is located in the northern celestial hemisphere between Pisces to the west and Taurus to the east. The name Aries is Latin for ram, and its symbol is 20px (Unicode ♈), representing a ram's horns. It is one of the 48 constellations described by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. It is a mid-sized constellation, ranking 39th overall size, with an area of 441 square degrees (1.1% of the celestial sphere).Although Aries came to represent specifically the ram whose fleece became the Golden Fleece of Ancient Greek mythology, it has represented a ram since late Babylonian times. Before that, the stars of Aries formed a farmhand. Different cultures have incorporated the stars of Aries into different constellations including twin inspectors in China and a porpoise in the Marshall Islands. Aries is a relatively dim constellation, possessing only four bright stars: Hamal (Alpha Arietis, second magnitude), Sheratan (Beta Arietis, third magnitude), Mesarthim (Gamma Arietis, fourth magnitude), and 41 Arietis (also fourth magnitude). The few deep-sky objects within the constellation are quite faint and include several pairs of interacting galaxies. Several meteor showers appear to radiate from Aries, including the Daytime Arietids and the Epsilon Arietids.