Our galaxy - School of Physics
... • The story of how we found out the shape of the Galaxy is told in a lovely book, “Minding the Heavens: The Story of our Discovery of the Milky Way” by Leila Belkora (IoP, 2003). • The website of the UCLA Galactic Centre group is at http://www.galacticcenter.astro.ucla.edu/. It contains lots of inte ...
... • The story of how we found out the shape of the Galaxy is told in a lovely book, “Minding the Heavens: The Story of our Discovery of the Milky Way” by Leila Belkora (IoP, 2003). • The website of the UCLA Galactic Centre group is at http://www.galacticcenter.astro.ucla.edu/. It contains lots of inte ...
Test Ch. 27 Multiple Choice Identify the choice that best completes
... D. red giant 25. In the last stage of stellar evolution following a supernova, stars too massive to form neutron stars may form a A. black dwarf. B. red supergiant. C. white dwarf. D. black hole. 26. In which stage of stellar evolution does combined hydrogen fusion and helium fusion cause a star’s o ...
... D. red giant 25. In the last stage of stellar evolution following a supernova, stars too massive to form neutron stars may form a A. black dwarf. B. red supergiant. C. white dwarf. D. black hole. 26. In which stage of stellar evolution does combined hydrogen fusion and helium fusion cause a star’s o ...
October 2016 BRAS Newsletter - The Baton Rouge Astronomical
... ‘The burst of the century’ “This was the burst of the century!” exclaimed James A. Wren, an engineer at Los Alamos National Laboratory and coauthor of one of the papers. Indeed, GRB 130427A (as it is now called) was the most powerful gamma-ray burst and the secondbrightest optical flash measured in ...
... ‘The burst of the century’ “This was the burst of the century!” exclaimed James A. Wren, an engineer at Los Alamos National Laboratory and coauthor of one of the papers. Indeed, GRB 130427A (as it is now called) was the most powerful gamma-ray burst and the secondbrightest optical flash measured in ...
SkyWatcher2017.5 1.3 Mb - Boise Astronomical Society
... luminosity distance of DL = 749 mega-parsecs may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of −26.7, meaning that if it were only as distant as Pollux it would appear nearly as bright in the sky as the Sun. Since the sun's absolute magnitude ...
... luminosity distance of DL = 749 mega-parsecs may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of −26.7, meaning that if it were only as distant as Pollux it would appear nearly as bright in the sky as the Sun. Since the sun's absolute magnitude ...
Labeling the HR Diagram - Mastering Physics Answers
... Spectral type is related to surface temperature, with stars of spectral type O having the highest surface temperature and stars of spectral type M having the lowest surface temperature. In other words, spectral type increases to the left on the HR diagram. Now proceed to Part E to determine how the ...
... Spectral type is related to surface temperature, with stars of spectral type O having the highest surface temperature and stars of spectral type M having the lowest surface temperature. In other words, spectral type increases to the left on the HR diagram. Now proceed to Part E to determine how the ...
THE MONTHLY SKY GUIDE, SIXTH EDITION
... own light but planets do not. Planets shine in the sky because they reflect the light of the Sun. They can consist mostly of rock, like our Earth, or they can be composed of gas and liquid, as are Jupiter and Saturn. Planets are always on the move, so they cannot be shown on the maps in this book. T ...
... own light but planets do not. Planets shine in the sky because they reflect the light of the Sun. They can consist mostly of rock, like our Earth, or they can be composed of gas and liquid, as are Jupiter and Saturn. Planets are always on the move, so they cannot be shown on the maps in this book. T ...
Astronomy Astrophysics NGC 7419 as a template for red supergiant clusters &
... spectroscopy around the Hα line for most of the candidate Be stars, confirming their nature. A second peculiarity of NGC 7419 is the presence of five red supergiants (RSGs) as confirmed radial velocity members of the cluster (Beauchamp et al. 1994). Until recently, this was the highest number of RSG ...
... spectroscopy around the Hα line for most of the candidate Be stars, confirming their nature. A second peculiarity of NGC 7419 is the presence of five red supergiants (RSGs) as confirmed radial velocity members of the cluster (Beauchamp et al. 1994). Until recently, this was the highest number of RSG ...
Variable Stars – II. Pulsating stars
... As noted above, Cepheids have similar temperatures to the Sun (something like 5000 to 7000K; spectral types from early F to K) and range in luminosity from about 500L⊙ to about 30000L⊙ which makes them detectable at great distances. Their periods are typically from about 1 to 50 days. For individual ...
... As noted above, Cepheids have similar temperatures to the Sun (something like 5000 to 7000K; spectral types from early F to K) and range in luminosity from about 500L⊙ to about 30000L⊙ which makes them detectable at great distances. Their periods are typically from about 1 to 50 days. For individual ...
Entropy
... entropy and entropy production for astrophysical objects; rough estimates are applied in rare cases even for relatively well-studied objects, such as, for instance, stars [11-15]. However, it is obvious that such calculations are extremely important for our understanding of the physics of the world ...
... entropy and entropy production for astrophysical objects; rough estimates are applied in rare cases even for relatively well-studied objects, such as, for instance, stars [11-15]. However, it is obvious that such calculations are extremely important for our understanding of the physics of the world ...
Entropy Production of Main-Sequence Stars
... to discuss of black holes, questions connected with the accelerated expansion of the Universe, to build and generalize gravitation theories, etc. (see, e.g., [6–10]). The majority of the papers, being strictly theoretical, place principal emphasis on functional relations between variables establishe ...
... to discuss of black holes, questions connected with the accelerated expansion of the Universe, to build and generalize gravitation theories, etc. (see, e.g., [6–10]). The majority of the papers, being strictly theoretical, place principal emphasis on functional relations between variables establishe ...
Chapter 26.2 notes
... Properties of Stars Size and Mass Once astronomers know a star’s temperature and absolute brightness, they can estimate its diameter and then calculate its volume. The masses of many stars can be determined by observing the gravitational interaction of stars that occur in pairs. For most stars, ther ...
... Properties of Stars Size and Mass Once astronomers know a star’s temperature and absolute brightness, they can estimate its diameter and then calculate its volume. The masses of many stars can be determined by observing the gravitational interaction of stars that occur in pairs. For most stars, ther ...
What are Messier Objects? - Bowling Green State University
... visible to the naked eye. Is considered one of the brightest of all deep sky objects and is one of the most studied. ...
... visible to the naked eye. Is considered one of the brightest of all deep sky objects and is one of the most studied. ...
The Pleiades in the Salle des Taureaux", Grotte de Lascaux
... the oldest traditions, for example from the nomenclature in the Almanac of Fig. 4 The copperplate engraving VII from Bode, 1805. The figure of the Klaudios Ptolemaios2 (ERREN, 1967: constellation looks like the rock picture of the aurochs no. 18 in the "Salle des 320; KUNITZSCH, 1974: 268-269, 271); ...
... the oldest traditions, for example from the nomenclature in the Almanac of Fig. 4 The copperplate engraving VII from Bode, 1805. The figure of the Klaudios Ptolemaios2 (ERREN, 1967: constellation looks like the rock picture of the aurochs no. 18 in the "Salle des 320; KUNITZSCH, 1974: 268-269, 271); ...
Colour-magnitude diagrams of the post
... can be considered a member. Goranskii determined a period of 0.5752 days, so that the cluster can be tentatively classified as Oosterhoff type I. 5. Conclusions Cluster parameters based on CCD photometry were derived for NGC 6256 and NGC 6717. They are both located in the bulge, but are not metal-ri ...
... can be considered a member. Goranskii determined a period of 0.5752 days, so that the cluster can be tentatively classified as Oosterhoff type I. 5. Conclusions Cluster parameters based on CCD photometry were derived for NGC 6256 and NGC 6717. They are both located in the bulge, but are not metal-ri ...
Chap 16: Galaxies
... Starburst galaxies contain many young stars and recent supernovae, and are often very rich in gas and dust; bright in infrared: ultraluminous infrared galaxies ...
... Starburst galaxies contain many young stars and recent supernovae, and are often very rich in gas and dust; bright in infrared: ultraluminous infrared galaxies ...
Lecture 3 - University of Washington
... • Earlier (1930’s) suggested by Fritz Zwicky, became an accepted view after Rubin’s work • While, in principle, this discrepancy could also be due to a different gravitational law (i.e. force that is not ∝ 1/R2), the modern data, including cosmic microwave background measurements, suggest that indee ...
... • Earlier (1930’s) suggested by Fritz Zwicky, became an accepted view after Rubin’s work • While, in principle, this discrepancy could also be due to a different gravitational law (i.e. force that is not ∝ 1/R2), the modern data, including cosmic microwave background measurements, suggest that indee ...
classifying stars
... (HOW BRIGHT A STAR APPEARS.) However, if astronomers could take two stars and place them exactly the same distance from earth, they could tell which one really is brighter... unfortunately, this is not possible, but astronomers can measure the amount of light a star actually gives off. This is calle ...
... (HOW BRIGHT A STAR APPEARS.) However, if astronomers could take two stars and place them exactly the same distance from earth, they could tell which one really is brighter... unfortunately, this is not possible, but astronomers can measure the amount of light a star actually gives off. This is calle ...
The Paranatellonta in ancient Greek astrological literature
... eleventh century 9 and sounds like that: "Through Teucer the Babylonian’s books could be acquired many things more than beautiful, and through the zodiacal signs which are in the sky 10 and by (the stars) rising together with each of them and through the so-called decans, obtaining resources of all ...
... eleventh century 9 and sounds like that: "Through Teucer the Babylonian’s books could be acquired many things more than beautiful, and through the zodiacal signs which are in the sky 10 and by (the stars) rising together with each of them and through the so-called decans, obtaining resources of all ...
Star Formation in Our Galaxy - Wiley-VCH
... dark clouds in Orion, determined by tracing the regions of strong obscuration in optical photographs. A number of the most prominent structures, such as L1630 and L1641, are labeled by their designations in the Lynds cloud catalogue. The shaded areas, including those with NGC numbers, are chiefly re ...
... dark clouds in Orion, determined by tracing the regions of strong obscuration in optical photographs. A number of the most prominent structures, such as L1630 and L1641, are labeled by their designations in the Lynds cloud catalogue. The shaded areas, including those with NGC numbers, are chiefly re ...
Globular Clusters
... ω Centauri, the biggest Galactic GC, barely visible in the southern hemisphere. The first ‘astronomical’ detection dates back to the 18th century. John Herschel, in the 1830s, realized that a large number of these clusters are concentrated in a relatively small portion of the sky in the direction of ...
... ω Centauri, the biggest Galactic GC, barely visible in the southern hemisphere. The first ‘astronomical’ detection dates back to the 18th century. John Herschel, in the 1830s, realized that a large number of these clusters are concentrated in a relatively small portion of the sky in the direction of ...
File 11 - School of Astronomy, IPM
... Often low surface brightness, so hard to find. More than one family of objects: • Gas-poor, passive (dE and dSph) • Gas rich, star forming • Why are dwarf galaxies important? • Majority of galaxies are dwarfs! • Dwarf galaxies may be remnants of galaxy formation process: “proto-dwarf” gas clouds cam ...
... Often low surface brightness, so hard to find. More than one family of objects: • Gas-poor, passive (dE and dSph) • Gas rich, star forming • Why are dwarf galaxies important? • Majority of galaxies are dwarfs! • Dwarf galaxies may be remnants of galaxy formation process: “proto-dwarf” gas clouds cam ...
Moitinho et al. - Wiley Online Library
... Furthermore, metallicity does not affect the colours of these stars significantly. Hence the only unknowns that remain in the CMD analysis are distance and age, which can also be uniquely derived provided that the photometry is deep enough so that a population sequence appears with a well defined mo ...
... Furthermore, metallicity does not affect the colours of these stars significantly. Hence the only unknowns that remain in the CMD analysis are distance and age, which can also be uniquely derived provided that the photometry is deep enough so that a population sequence appears with a well defined mo ...
1 Introduction - Wiley-VCH
... Their kinematic is characterized by a more or less significant rotation. They are generally referred to as late-type systems. In addition to these two families, there exists an intermediate class of objects. The lenticular galaxies (S0) are characterized by a flat disk without any spiral structure, ...
... Their kinematic is characterized by a more or less significant rotation. They are generally referred to as late-type systems. In addition to these two families, there exists an intermediate class of objects. The lenticular galaxies (S0) are characterized by a flat disk without any spiral structure, ...
Constraining the star formation histories of spiral bulges
... Stellar populations in spiral bulges are investigated using the Lick system of spectral indices. Long-slit spectroscopic observations of line strengths and kinematics made along the minor axes of four spiral bulges are reported. Comparisons are made between central line strengths in spiral bulges an ...
... Stellar populations in spiral bulges are investigated using the Lick system of spectral indices. Long-slit spectroscopic observations of line strengths and kinematics made along the minor axes of four spiral bulges are reported. Comparisons are made between central line strengths in spiral bulges an ...
26.2 Stars - Clinton Public Schools
... Properties of Stars Size and Mass Once astronomers know a star’s temperature and absolute brightness, they can estimate its diameter and then calculate its volume. The masses of many stars can be determined by observing the gravitational interaction of stars that occur in pairs. For most stars, ther ...
... Properties of Stars Size and Mass Once astronomers know a star’s temperature and absolute brightness, they can estimate its diameter and then calculate its volume. The masses of many stars can be determined by observing the gravitational interaction of stars that occur in pairs. For most stars, ther ...
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.