Life Cycle of Stars
... Is a barred spiral galaxy with two spiral arms. The central bulge is a huge collection of old stars. It is surrounded by spinning disc of newer stars and clumps of gas and dust. Our solar system is located on the inner edge of one of the spiral arms. A massive black hole is located at the cent ...
... Is a barred spiral galaxy with two spiral arms. The central bulge is a huge collection of old stars. It is surrounded by spinning disc of newer stars and clumps of gas and dust. Our solar system is located on the inner edge of one of the spiral arms. A massive black hole is located at the cent ...
2010_02_04 LP08 Our Galactic Home
... Lasers (reflecting off the Moon) Radar (reflecting off the Moon or Venus) Heliocentric parallax (Earth’s ORBIT as baseline) Moving clusters (Pleiades) H-R Diagram R R Lyrae variable stars (M=0.5) Cepheid variable stars Brightest supergiants (M=-8) “Normal” novae Globular clusters (brightest at M=-10 ...
... Lasers (reflecting off the Moon) Radar (reflecting off the Moon or Venus) Heliocentric parallax (Earth’s ORBIT as baseline) Moving clusters (Pleiades) H-R Diagram R R Lyrae variable stars (M=0.5) Cepheid variable stars Brightest supergiants (M=-8) “Normal” novae Globular clusters (brightest at M=-10 ...
1 Ay 124 Winter 2016 – HOMEWORK #3
... Problem 1 The nearest spiral galaxy to the Milky Way, M31, has a very concentrated nucleus. At a projected radius of 1 arcsec, stars in the nucleus have a line of sight velocity dispersion of 150 km s−1 , and are also rotating about the nucleus at 150 km s−1 . The total luminosity from within 1 arc ...
... Problem 1 The nearest spiral galaxy to the Milky Way, M31, has a very concentrated nucleus. At a projected radius of 1 arcsec, stars in the nucleus have a line of sight velocity dispersion of 150 km s−1 , and are also rotating about the nucleus at 150 km s−1 . The total luminosity from within 1 arc ...
Variable Stars: Pulsation, Evolution and applications to Cosmology
... 10 Msun star has tMS ~ 10 Million yrs 0.1Msun star has tMS ~ 10 Trillion Years. ...
... 10 Msun star has tMS ~ 10 Million yrs 0.1Msun star has tMS ~ 10 Trillion Years. ...
1 Ay 124 Winter 2014 – HOMEWORK #3
... Problem 1 The nearest spiral galaxy to the Milky Way, M31, has a very concentrated nucleus. At a projected radius of 1 arcsec, stars in the nucleus have a line of sight velocity dispersion of 150 km s−1 , and are also rotating about the nucleus at 150 km s−1 . The total luminosity from within 1 arc ...
... Problem 1 The nearest spiral galaxy to the Milky Way, M31, has a very concentrated nucleus. At a projected radius of 1 arcsec, stars in the nucleus have a line of sight velocity dispersion of 150 km s−1 , and are also rotating about the nucleus at 150 km s−1 . The total luminosity from within 1 arc ...
Hubble`s Law is the relation between the recession velocity of a
... for the density wave theory, not the other way around. Similarly, the fact that we see star formation implies that elliptical galaxies were once more efficient then spirals, not the other way around. Also, while population I stars are younger than population II stars, not all (or even most) populati ...
... for the density wave theory, not the other way around. Similarly, the fact that we see star formation implies that elliptical galaxies were once more efficient then spirals, not the other way around. Also, while population I stars are younger than population II stars, not all (or even most) populati ...
Chapter 19 Star Formation
... begins. The protostar has become a star. The star continues to contract and increase in temperature until it is in equilibrium: Internal pressure force outward, balancing the inward force of gravity, at every layer of the star’s interior. This is stage 7: The star has reached the Main Sequence and w ...
... begins. The protostar has become a star. The star continues to contract and increase in temperature until it is in equilibrium: Internal pressure force outward, balancing the inward force of gravity, at every layer of the star’s interior. This is stage 7: The star has reached the Main Sequence and w ...
Telescopes (continued). Properties of Stars.
... light as the Sun, but it is located 27,000 times further away from Earth than the Sun. Thus, its apparent brightness is 70 billion times less than that of the Sun. ...
... light as the Sun, but it is located 27,000 times further away from Earth than the Sun. Thus, its apparent brightness is 70 billion times less than that of the Sun. ...
Groups of Stars
... Most stars occur in groups of two or more. • A star system is a group of two or more stars that are ...
... Most stars occur in groups of two or more. • A star system is a group of two or more stars that are ...
Homework #7 (Ch. 19)
... because the entire process occurs deep inside a molecular cloud, which itself is deep inside a dark, dense dust cloud. Visible light cannot escape from this environment but long ...
... because the entire process occurs deep inside a molecular cloud, which itself is deep inside a dark, dense dust cloud. Visible light cannot escape from this environment but long ...
Stellar Birth - Chabot College
... Same relative distance comparing relative brightness is fair Same relative age comparing masses and types of stars is fair ...
... Same relative distance comparing relative brightness is fair Same relative age comparing masses and types of stars is fair ...
After the ZAMS - Lincoln-Sudbury Regional High School
... The Universe simply isn’t old enough for many very low mass stars to have made it onto the main sequence, let alone off it! This slowness is however of great benefit to us on Earth, with a Sun which has evolved not terribly fast. ...
... The Universe simply isn’t old enough for many very low mass stars to have made it onto the main sequence, let alone off it! This slowness is however of great benefit to us on Earth, with a Sun which has evolved not terribly fast. ...
CCD BVRI and 2MASS Photometry of the Poorly Studied Open
... Key words: Galaxy: open clusters and associations – individual: NGC 6631 – astrometry – Stars: luminosity function – Mass function. Open star clusters (OCs) are ideal objects for studying the main properties of the Milky Way Galaxy, i.e. star formation, stellar evolution, and distance scale of the G ...
... Key words: Galaxy: open clusters and associations – individual: NGC 6631 – astrometry – Stars: luminosity function – Mass function. Open star clusters (OCs) are ideal objects for studying the main properties of the Milky Way Galaxy, i.e. star formation, stellar evolution, and distance scale of the G ...
Unit 1: The Big Picture
... Intergalactic Space: the space between galaxies. mostly nothing, can’t see it, gravitational pull toward it exists Galaxy Clusters: small group of galaxies – Closest is Sagittarius galaxy 75,000 LY, Magellanic Clouds, then Andromeda ...
... Intergalactic Space: the space between galaxies. mostly nothing, can’t see it, gravitational pull toward it exists Galaxy Clusters: small group of galaxies – Closest is Sagittarius galaxy 75,000 LY, Magellanic Clouds, then Andromeda ...
Lecture 13
... • Most stars end up small and white after all fusion has ceased: white dwarfs. • The white dwarf stage is the final stage for most stars. ...
... • Most stars end up small and white after all fusion has ceased: white dwarfs. • The white dwarf stage is the final stage for most stars. ...
Constellations - Sierra Star Gazers
... clusters situated about 7,300 light years away. With visual magnitudes of 5.3 and 6.1 respectively, the pair was labeled as Caldwell 14 by Sir Patrick Moore, but somehow missed a Messier designation. While either cluster could stand alone as a noteworthy object, the pair, spanning two full Moon diam ...
... clusters situated about 7,300 light years away. With visual magnitudes of 5.3 and 6.1 respectively, the pair was labeled as Caldwell 14 by Sir Patrick Moore, but somehow missed a Messier designation. While either cluster could stand alone as a noteworthy object, the pair, spanning two full Moon diam ...
ALUMINIUM-26 IN THE EARLY SOLAR SYSTEM : A PROBABILITY
... formation [21]. It is comparable to the probability estimate calculated by [7, 8] for injection by a single SN. These works however vastly surestimated the fraction of disks (or cores) present within 1 pc of a SN. In fact, when massive stars are ready to explode as SNe, they are surrounded by HII re ...
... formation [21]. It is comparable to the probability estimate calculated by [7, 8] for injection by a single SN. These works however vastly surestimated the fraction of disks (or cores) present within 1 pc of a SN. In fact, when massive stars are ready to explode as SNe, they are surrounded by HII re ...
Milky Way
... • The luminosities of these things are HUGE: 1052 ergs/s. Equivalent to vaporizing a star into pure energy in a matter of 10 seconds. • Also highly beamed and relativistic (indicating jets moving near the speed of light) • Now we have the satellite Swift that can rotate quickly in the sky to do deta ...
... • The luminosities of these things are HUGE: 1052 ergs/s. Equivalent to vaporizing a star into pure energy in a matter of 10 seconds. • Also highly beamed and relativistic (indicating jets moving near the speed of light) • Now we have the satellite Swift that can rotate quickly in the sky to do deta ...
The Age of the Milky Way - Astronomy Program
... • In paleontology, ages of fossils are needed to understand evolution. • In archaeology, ages of finds are crucial for dating events and tracing human activity. ...
... • In paleontology, ages of fossils are needed to understand evolution. • In archaeology, ages of finds are crucial for dating events and tracing human activity. ...
Stellar Evolution
... Fast wind from hot, inner layers of the star overtakes the slow wind and excites it => Planetary Nebula ...
... Fast wind from hot, inner layers of the star overtakes the slow wind and excites it => Planetary Nebula ...
ON THE FORMATION OF MASSIVE STELLAR CLUSTERS
... as in galaxies of different types (see also Larsen & Richtler 2000 and Larsen 1999). This star-forming activity in which masses similar to the total gas content found in galactic giant molecular clouds (massive elongated structures that extend over 100 pc in length) are turned into stars, all in a v ...
... as in galaxies of different types (see also Larsen & Richtler 2000 and Larsen 1999). This star-forming activity in which masses similar to the total gas content found in galactic giant molecular clouds (massive elongated structures that extend over 100 pc in length) are turned into stars, all in a v ...
CCD PHOTOMETRY OF OPEN STAR CLUSTER M67
... old open star cluster. The distance and age of open star clusters can be determined by comparison of the process of main sequence with a theoretical model. Theoretical isochrones used in this work were published by Bertelli et al. (1994), and include models for different chemical composition and age ...
... old open star cluster. The distance and age of open star clusters can be determined by comparison of the process of main sequence with a theoretical model. Theoretical isochrones used in this work were published by Bertelli et al. (1994), and include models for different chemical composition and age ...
Where planets are formed: Protoplanetary disk evolution and planet
... Nebula distance from supernova < 0.3 pc N>1000 • The Solar System survived the supernova explosion distance from the supernova > 0.1 pc Solar System properties require the Sun formed in the outer region of an intermediate massive cluster, with few thousand members, necessary to provide the req ...
... Nebula distance from supernova < 0.3 pc N>1000 • The Solar System survived the supernova explosion distance from the supernova > 0.1 pc Solar System properties require the Sun formed in the outer region of an intermediate massive cluster, with few thousand members, necessary to provide the req ...
Chapter 19 Star Formation
... • Stars begin to form when an interstellar cloud begins to contract • The cloud fragments as it contracts; fragments continue to collapse and fragment until their density is high enough to prohibit further fragmentation ...
... • Stars begin to form when an interstellar cloud begins to contract • The cloud fragments as it contracts; fragments continue to collapse and fragment until their density is high enough to prohibit further fragmentation ...
Open cluster
An open cluster, also known as galactic cluster, is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way Galaxy, and many more are thought to exist. They are loosely bound by mutual gravitational attraction and become disrupted by close encounters with other clusters and clouds of gas as they orbit the galactic center, resulting in a migration to the main body of the galaxy as well as a loss of cluster members through internal close encounters. Open clusters generally survive for a few hundred million years, with the most massive ones surviving for a few billion years. In contrast, the more massive globular clusters of stars exert a stronger gravitational attraction on their members, and can survive for longer. Open clusters have been found only in spiral and irregular galaxies, in which active star formation is occurring.Young open clusters may still be contained within the molecular cloud from which they formed, illuminating it to create an H II region. Over time, radiation pressure from the cluster will disperse the molecular cloud. Typically, about 10% of the mass of a gas cloud will coalesce into stars before radiation pressure drives the rest of the gas away.Open clusters are key objects in the study of stellar evolution. Because the cluster members are of similar age and chemical composition, their properties (such as distance, age, metallicity and extinction) are more easily determined than they are for isolated stars. A number of open clusters, such as the Pleiades, Hyades or the Alpha Persei Cluster are visible with the naked eye. Some others, such as the Double Cluster, are barely perceptible without instruments, while many more can be seen using binoculars or telescopes. The Wild Duck Cluster, M11, is an example.