Chapter 17
... other galaxies galaxy was the entire universe. As telescopes got better, though, some “smudges” that were thought to be nebulae in the Milky Way were recognized to be whole galaxies far outside our own. The discovery was made in the 1920s by Edwin Hubble, an American astronomer. When he focused a hu ...
... other galaxies galaxy was the entire universe. As telescopes got better, though, some “smudges” that were thought to be nebulae in the Milky Way were recognized to be whole galaxies far outside our own. The discovery was made in the 1920s by Edwin Hubble, an American astronomer. When he focused a hu ...
What is a Star - Optics Institute of Southern California
... The final ingredient in determining the structure of a main sequence star is the source of heat in the interior, nuclear reactions. There are many of these, and the details are complicated and there is still some uncertainty about the exact rates for the reactions (for example, the solar neutrino pr ...
... The final ingredient in determining the structure of a main sequence star is the source of heat in the interior, nuclear reactions. There are many of these, and the details are complicated and there is still some uncertainty about the exact rates for the reactions (for example, the solar neutrino pr ...
in BRIGHTEST STARS
... supergiant star (Ia). Prof. James Kaler, using the figure of 2,600 light years as the distance, estimated a diameter 200 times greater than our sun, and about a quarter of a million times brighter in visible light. Considering its spectral classification (A2), Deneb must have a surface temperature b ...
... supergiant star (Ia). Prof. James Kaler, using the figure of 2,600 light years as the distance, estimated a diameter 200 times greater than our sun, and about a quarter of a million times brighter in visible light. Considering its spectral classification (A2), Deneb must have a surface temperature b ...
procedure processing the data - Mr. Traeger`s Earth Science
... Homework for tonight! Go outside tonight after dark with your star finder and some binoculars if you have them. A small flashlight (preferably with a red filter) is also needed. Make sure to hold the star finder over your head and point the North arrow in the direction of the mountains. On a separat ...
... Homework for tonight! Go outside tonight after dark with your star finder and some binoculars if you have them. A small flashlight (preferably with a red filter) is also needed. Make sure to hold the star finder over your head and point the North arrow in the direction of the mountains. On a separat ...
N5128PNSydney
... O is the most efficient coolant for the nebula < 15% of the stellar luminosity (1-2x104 L )סּis emitted in a single collisionally excited line O++ 1D2 – 3P2 [O III]5007Å This strong line allows detection of PN; high [O III]/Hα ratio discriminates against H I I regions Other lines of H, He, N, Ne, A ...
... O is the most efficient coolant for the nebula < 15% of the stellar luminosity (1-2x104 L )סּis emitted in a single collisionally excited line O++ 1D2 – 3P2 [O III]5007Å This strong line allows detection of PN; high [O III]/Hα ratio discriminates against H I I regions Other lines of H, He, N, Ne, A ...
Lecture18
... luminosity of the star Using the luminosity and the apparent brightness, the astronomer can calculate the distance to the star The relationship between period and luminosity was discovered by Henrietta Leavit in 1908 Leavit found that the brighter cepheids always had longer periods These cepheids we ...
... luminosity of the star Using the luminosity and the apparent brightness, the astronomer can calculate the distance to the star The relationship between period and luminosity was discovered by Henrietta Leavit in 1908 Leavit found that the brighter cepheids always had longer periods These cepheids we ...
Chasing the Pole — Howard L. Cohen
... away? This star may have an orbit about Polaris that requires tens of thousands of years to complete once. (This dim star was first seen by William Herschel in 1780.) Try observing this faint double even if you only have a two or three-inch aperture telescope. This star has even been seen with apert ...
... away? This star may have an orbit about Polaris that requires tens of thousands of years to complete once. (This dim star was first seen by William Herschel in 1780.) Try observing this faint double even if you only have a two or three-inch aperture telescope. This star has even been seen with apert ...
HW11
... the super giants (I), the giants (III) and the White Dwarfs. Why do each have the position that they do o the H-R diagram. For instance, red super giants have cool surface temperature. So they are on the right side of the diagram. But their luminosity is huge. This is because their radius is giganti ...
... the super giants (I), the giants (III) and the White Dwarfs. Why do each have the position that they do o the H-R diagram. For instance, red super giants have cool surface temperature. So they are on the right side of the diagram. But their luminosity is huge. This is because their radius is giganti ...
Astronomy Worksheet
... *In general a hot star’s spectrum looks smoother than a cooler star’s spectrum. *In very hot stars (> 10,000 K) most of the Hydrogen gas in the star’s atmosphere will be ionized. Since an ionized Hydrogen atom has no electron it cannot produce any spectral lines, thus the Hydrogen lines are weak in ...
... *In general a hot star’s spectrum looks smoother than a cooler star’s spectrum. *In very hot stars (> 10,000 K) most of the Hydrogen gas in the star’s atmosphere will be ionized. Since an ionized Hydrogen atom has no electron it cannot produce any spectral lines, thus the Hydrogen lines are weak in ...
arXiv:0712.2297v1 [astro
... telescopes. Consequently, more than 66% of our target stars are fainter than V=8 mag. The observing scheme follows the standard practices implemented in precision radial velocity measurements with the iodine cell (Marcy & Butler 1992). The spectral data used for RV measurements are extracted from th ...
... telescopes. Consequently, more than 66% of our target stars are fainter than V=8 mag. The observing scheme follows the standard practices implemented in precision radial velocity measurements with the iodine cell (Marcy & Butler 1992). The spectral data used for RV measurements are extracted from th ...
Chapter 2 Test Review Vocabulary • axis – an imaginary line
... Why does the moon’s shape look different on different nights? As the moon revolves around Earth, different amounts of its bright side can be seen. Stars Why does the sun look larger than the other stars you can see? The sun looks larger than other stars you can see because it is so much clos ...
... Why does the moon’s shape look different on different nights? As the moon revolves around Earth, different amounts of its bright side can be seen. Stars Why does the sun look larger than the other stars you can see? The sun looks larger than other stars you can see because it is so much clos ...
Astronomy Part 1 - Malvern Troop 7
... a) Identify in the sky at least 10 constellations, at least four of which are in the zodiac. b) Identify at least eight conspicuous stars, five of which are of magnitude 1 or brighter. c) Make two sketches of the Big Dipper. In one sketch, show the Big Dipper's orientation in the early evening sky. ...
... a) Identify in the sky at least 10 constellations, at least four of which are in the zodiac. b) Identify at least eight conspicuous stars, five of which are of magnitude 1 or brighter. c) Make two sketches of the Big Dipper. In one sketch, show the Big Dipper's orientation in the early evening sky. ...
Ch. 20
... the use of instructors in teaching their courses and assessing student learning. Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permitted. The work and materials from it should never be made available to students exc ...
... the use of instructors in teaching their courses and assessing student learning. Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permitted. The work and materials from it should never be made available to students exc ...
SPECTRAL ANALYSIS OF A NEWLY DISCOVERED HgMn STAR
... 4500-5840 Å. The data were obtained with the multi-fiber spectrograph GIRAFFE with MEDUSA, mounted at UT2 (Kueyen), the 8 meter class VLT telescope, in Chile. The atmospheric parameters of the star were determined from Geneva photometry and hydrogen line modeling (Te = 12000 ± 200 K, log g = 4.1 ± ü ...
... 4500-5840 Å. The data were obtained with the multi-fiber spectrograph GIRAFFE with MEDUSA, mounted at UT2 (Kueyen), the 8 meter class VLT telescope, in Chile. The atmospheric parameters of the star were determined from Geneva photometry and hydrogen line modeling (Te = 12000 ± 200 K, log g = 4.1 ± ü ...
Chapter 13 The Life of a Star The Life of a Star Mass Is the Key The
... History of Stellar Evolution Theories • Aristotle wrote more than 2000 years ago that stars are heated by their passage through the heavens, but never considered that they evolved • In the 18th century, Immanuel Kant described the Sun as a fiery sphere, formed from the gases gravitated to the center ...
... History of Stellar Evolution Theories • Aristotle wrote more than 2000 years ago that stars are heated by their passage through the heavens, but never considered that they evolved • In the 18th century, Immanuel Kant described the Sun as a fiery sphere, formed from the gases gravitated to the center ...
28. What causes waves - Summer Science Safari
... light year distance light travels in one year apparent magnitude how bright a star appears from earth galaxy largest grouping of stars in space absolute magnitude the actual brightness of a star parallax one of the ways we measure distances in space; apparent shift in a star’s location nebulae cloud ...
... light year distance light travels in one year apparent magnitude how bright a star appears from earth galaxy largest grouping of stars in space absolute magnitude the actual brightness of a star parallax one of the ways we measure distances in space; apparent shift in a star’s location nebulae cloud ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.