Expanding Universe and Big Bang
... developed to measure astronomical distances. Next he turned his attention to Slipher’s puzzling results – why were galaxies so much more likely to be moving away from the Milky Way? Surely, if they were all randomly distributed throughout the cosmos, they should be as likely to go one way as another ...
... developed to measure astronomical distances. Next he turned his attention to Slipher’s puzzling results – why were galaxies so much more likely to be moving away from the Milky Way? Surely, if they were all randomly distributed throughout the cosmos, they should be as likely to go one way as another ...
Life Stages of High
... Particles can’t be in same state in same place Doesn’t depend on heat content ...
... Particles can’t be in same state in same place Doesn’t depend on heat content ...
High resolution spectroscopy: what`s next?
... these main scientific drivers: • Measure high-precision radial velocities (RV) for search for rocky planets; • Measure the variation of physical constants; • Analyse the chemical composition of stars in nearby galaxies; Feb 2011 Kick-off of the ESPRESSO project whose proposal was accepted by ...
... these main scientific drivers: • Measure high-precision radial velocities (RV) for search for rocky planets; • Measure the variation of physical constants; • Analyse the chemical composition of stars in nearby galaxies; Feb 2011 Kick-off of the ESPRESSO project whose proposal was accepted by ...
Supermassive Black Holes and the Growth of Galaxies
... The equations of gravity tell us that the escape velocity for a spherical object (such as a star or planet) is given by vesc = GM/R. Thus, if we make an object more massive (larger M) or compress it (smaller R), then we increase the escape velocity. Taking this to its extreme, we can imagine taking ...
... The equations of gravity tell us that the escape velocity for a spherical object (such as a star or planet) is given by vesc = GM/R. Thus, if we make an object more massive (larger M) or compress it (smaller R), then we increase the escape velocity. Taking this to its extreme, we can imagine taking ...
First firm spectral classification of an early-B pre-main
... massive YSOs, based on luminosity arguments (e.g., Urquhart et al. 2011). A (K-band) spectrum has been obtained for only a few of these (Hanson et al. 1997, 2002; Bik et al. 2006), and they show a red continuum, likely due to hot dust, and an emission-line spectrum that includes Brγ and, often, CO 2 ...
... massive YSOs, based on luminosity arguments (e.g., Urquhart et al. 2011). A (K-band) spectrum has been obtained for only a few of these (Hanson et al. 1997, 2002; Bik et al. 2006), and they show a red continuum, likely due to hot dust, and an emission-line spectrum that includes Brγ and, often, CO 2 ...
Homologous Stellar Models and Polytropes Main Sequence Stars
... Main Sequence stars obey several relations: • As already shown by homology, L ∝ M a5 where for low-mass and highmass stars a5 = 5.5 and a5 = 3.0 were deduced respectively. The flattening at higher masses is due to the increased contribution of radiation pressure in the central core, which helps supp ...
... Main Sequence stars obey several relations: • As already shown by homology, L ∝ M a5 where for low-mass and highmass stars a5 = 5.5 and a5 = 3.0 were deduced respectively. The flattening at higher masses is due to the increased contribution of radiation pressure in the central core, which helps supp ...
Emergency Land Navigation
... other and thus are called fixed stars. Out of the many stars found on the sphere, there are only 57 of them, which we consider are bright enough to help us in our navigation. Planets as a class move among the fixed stars; the navigational planets are Mercury, Venus, Mars, Jupiter, Saturn, the Moon a ...
... other and thus are called fixed stars. Out of the many stars found on the sphere, there are only 57 of them, which we consider are bright enough to help us in our navigation. Planets as a class move among the fixed stars; the navigational planets are Mercury, Venus, Mars, Jupiter, Saturn, the Moon a ...
the magellanic clouds newsletter - Keele University Astrophysics
... age distribution of the LMC Cepheids is found to have a peak at log Age = 8.2 ± 0.1. This suggests that major star formation event took place at about 125–200 Myr ago which may have been triggered by a close encounter between the SMC and the LMC. Cepheids are found to be asymmetrically distributed t ...
... age distribution of the LMC Cepheids is found to have a peak at log Age = 8.2 ± 0.1. This suggests that major star formation event took place at about 125–200 Myr ago which may have been triggered by a close encounter between the SMC and the LMC. Cepheids are found to be asymmetrically distributed t ...
May 2017 Astronomy Calendar by Dave Mitsky
... http://www.popastro.com/meteor/activity/activity.php?id_pag=485 for additional information. Information on Iridium flares and passes of the ISS, the Tiangong-1, the USAF’s X-37B, the HST, and other satellites can be found at http://www.heavens-above.com/ The Moon is 6.2 days old, is illuminated 44.6 ...
... http://www.popastro.com/meteor/activity/activity.php?id_pag=485 for additional information. Information on Iridium flares and passes of the ISS, the Tiangong-1, the USAF’s X-37B, the HST, and other satellites can be found at http://www.heavens-above.com/ The Moon is 6.2 days old, is illuminated 44.6 ...
D ASTROPHYSICS
... A galaxy is a creation of stars, gas, and dust held together by gravity and containing billions of stars. The Milky Way contains about 3 × 10 11 stars and, probably, at least this number of planets. Some galaxies exist in isolation but the majority of them occur in groups known as clusters that have ...
... A galaxy is a creation of stars, gas, and dust held together by gravity and containing billions of stars. The Milky Way contains about 3 × 10 11 stars and, probably, at least this number of planets. Some galaxies exist in isolation but the majority of them occur in groups known as clusters that have ...
sections 16-18 instructor notes
... extreme values for globular clusters. This technique also has uncertainties owing to the unknown rate of rotation for the globular cluster system about the Galactic centre, as well as to the possible existence of two distinct groups of globulars. An analysis of this type gives a value of 0 ≥ 230 km ...
... extreme values for globular clusters. This technique also has uncertainties owing to the unknown rate of rotation for the globular cluster system about the Galactic centre, as well as to the possible existence of two distinct groups of globulars. An analysis of this type gives a value of 0 ≥ 230 km ...
classifying stars
... The brightness of a star depends on its size, temperature and distance from the earth. Some stars appear brighter to us on earth because they are much closer than others, astronomers call this apparent magnitude (HOW BRIGHT A STAR APPEARS.) However, if astronomers could take two stars and place them ...
... The brightness of a star depends on its size, temperature and distance from the earth. Some stars appear brighter to us on earth because they are much closer than others, astronomers call this apparent magnitude (HOW BRIGHT A STAR APPEARS.) However, if astronomers could take two stars and place them ...
Low-Res Version - Chandra X
... The Crab Nebula is the remnant of a supernova explosion that was so powerful that it was seen on Earth by Chinese and Japanese astronomers in 1054 AD, long before telescopes were invented. Chandra is able to image the very heart of the remnant where a neutron star, only 10 miles across, but as massi ...
... The Crab Nebula is the remnant of a supernova explosion that was so powerful that it was seen on Earth by Chinese and Japanese astronomers in 1054 AD, long before telescopes were invented. Chandra is able to image the very heart of the remnant where a neutron star, only 10 miles across, but as massi ...
On the nature and detectability of Type Ib/c supernova progenitors
... calculate the corresponding visual magnitudes, which are shown in Fig. 4. This figure shows that helium stars of M = 3M⊙ − 5M⊙ are visually very faint (Mv > 1) on the helium main-sequence. However, rapid expansion of the helium envelope during and after the carbon-burning phase suddenly makes these ...
... calculate the corresponding visual magnitudes, which are shown in Fig. 4. This figure shows that helium stars of M = 3M⊙ − 5M⊙ are visually very faint (Mv > 1) on the helium main-sequence. However, rapid expansion of the helium envelope during and after the carbon-burning phase suddenly makes these ...
ROTATION CURVES OF HIGH-LUMINOSITY SPIRAL GALAXIES
... near Vmax, followed by sometimes falling, sometimes rising, velocities. But it is almost impossible to identify a galaxy with a falling optical rotation curve. NGC 4321 may be an example (van der Kruit 1973), al though measured velocities cover less than 1/2 the optical disk. From Bosnia's 21-cm co ...
... near Vmax, followed by sometimes falling, sometimes rising, velocities. But it is almost impossible to identify a galaxy with a falling optical rotation curve. NGC 4321 may be an example (van der Kruit 1973), al though measured velocities cover less than 1/2 the optical disk. From Bosnia's 21-cm co ...
1.1 Latitude and Longitude - Leigh
... ocean, latitude and longitude has become a part of nearly everyone daily life. Whether using turn-byturn directions with your GPS device or locating a friend’s location, latitude and longitude are the basis for many different applications in every day life. ...
... ocean, latitude and longitude has become a part of nearly everyone daily life. Whether using turn-byturn directions with your GPS device or locating a friend’s location, latitude and longitude are the basis for many different applications in every day life. ...
PRESS 2001 Project Report - Hong Kong University of Science and
... Half or more of all stars in the universe are in orbit around another star or stars. In most of these multiple-star systems, there is a type of system which consists of two stars only, known as a binary star system, whose components may be separated by a large fraction of a light year, or they may b ...
... Half or more of all stars in the universe are in orbit around another star or stars. In most of these multiple-star systems, there is a type of system which consists of two stars only, known as a binary star system, whose components may be separated by a large fraction of a light year, or they may b ...
Astronomy Assignment #1
... declinations of +87, -40, and -67. Which of these objects can you observe? This question requires a fairly complete understanding of the celestial coordinate system and the celestial sphere model. According to the last sentence on page 43 “if a star’s declination matches your latitude it will pas ...
... declinations of +87, -40, and -67. Which of these objects can you observe? This question requires a fairly complete understanding of the celestial coordinate system and the celestial sphere model. According to the last sentence on page 43 “if a star’s declination matches your latitude it will pas ...
Chapter-by-Chapter Guide
... proposed by The Essential Cosmic Perspective author Bennett. Voyage replicas are being developed for other science centers; if you are interested in learning more about how to get a Voyage replica in your town, please contact the author. (The same scale is also used in the Colorado Scale Model Solar ...
... proposed by The Essential Cosmic Perspective author Bennett. Voyage replicas are being developed for other science centers; if you are interested in learning more about how to get a Voyage replica in your town, please contact the author. (The same scale is also used in the Colorado Scale Model Solar ...
Annual report 2004 - Département d`Astrophysique, Géophysique et
... both the photometric and spectroscopic data. So far we encounter a puzzle : a non adiabatic analysis of the solutions best fitting the observed frequencies shows that these modes are not excited. We now study the influence of a different mixture of heavy elements. Eclipsing binary HD 92024 HD 92024 ...
... both the photometric and spectroscopic data. So far we encounter a puzzle : a non adiabatic analysis of the solutions best fitting the observed frequencies shows that these modes are not excited. We now study the influence of a different mixture of heavy elements. Eclipsing binary HD 92024 HD 92024 ...
Stellar Physics
... black of night. You see a single light which may be a motorcycle. How do you know how far way it is? (Is it a motorcycle or something else?) Practical demonstration: various small light sources of varying brightnesses could be placed in a totally darkened room or corridor. Four would be a suitable n ...
... black of night. You see a single light which may be a motorcycle. How do you know how far way it is? (Is it a motorcycle or something else?) Practical demonstration: various small light sources of varying brightnesses could be placed in a totally darkened room or corridor. Four would be a suitable n ...
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.