10-Jets and outflows
... 1 pc has grown at the speed of 10 km s−1 , then it must be 105 years old, comparable to the age of a Class I protostar. In general, outflow sizes range from under 0.1 pc to several parsecs. Furthermore, outflow speeds range from a few km s−1 up to about 100 km s−1 . Therefore, kinematic ages take on ...
... 1 pc has grown at the speed of 10 km s−1 , then it must be 105 years old, comparable to the age of a Class I protostar. In general, outflow sizes range from under 0.1 pc to several parsecs. Furthermore, outflow speeds range from a few km s−1 up to about 100 km s−1 . Therefore, kinematic ages take on ...
Supernovae - University of Texas Astronomy Home Page
... question under active investigation). If we consider stars with mass in excess of about 20 solar masses, we find such stars are born, and hence die, too infrequently to account for the rate at which Type II supernovae explode. If we consider stars with less than about 8 solar masses, we find that su ...
... question under active investigation). If we consider stars with mass in excess of about 20 solar masses, we find such stars are born, and hence die, too infrequently to account for the rate at which Type II supernovae explode. If we consider stars with less than about 8 solar masses, we find that su ...
Hubble Offers a Dazzling View of Necklace Nebula
... ring is actually two stars orbiting close together. One of the stars is near the end of its life and created the planetary nebula. The estimated age of the ring is around 5,000 years. The nebula is 15,000 light-years from Earth. Astronomers discovered the nebula in November 2005 with the Isaac Newto ...
... ring is actually two stars orbiting close together. One of the stars is near the end of its life and created the planetary nebula. The estimated age of the ring is around 5,000 years. The nebula is 15,000 light-years from Earth. Astronomers discovered the nebula in November 2005 with the Isaac Newto ...
ASTR-100 - Jiri Brezina Teaching
... Tidal heating slows the bodies' rotation until it becomes tidally locked, and the tidal bulge does not change any more (68). Two (from many) examples of tidal heating: Moon’s rotation, originally faster than now (the Moon showed all sides earlier), has been tidally locked to the Earth since 3.5 bill ...
... Tidal heating slows the bodies' rotation until it becomes tidally locked, and the tidal bulge does not change any more (68). Two (from many) examples of tidal heating: Moon’s rotation, originally faster than now (the Moon showed all sides earlier), has been tidally locked to the Earth since 3.5 bill ...
PowerPoint Presentation - Getting Acquainted to PDC
... Galaxy is an open, web-based platform for data intensive biomedical research. Whether on the free public server or your own instance, you can perform, reproduce, and share complete analyses. See http://galaxy.psu.edu ...
... Galaxy is an open, web-based platform for data intensive biomedical research. Whether on the free public server or your own instance, you can perform, reproduce, and share complete analyses. See http://galaxy.psu.edu ...
TEKS 8.13 A, B, and C
... are divided into Sa, which have a strong bulge and tight indistinct arms, Sb, which are an intermediate type, and Sc, which have a small bulge and loose, well-defined arms. Stars in spiral galaxies tend to be of a medium age but new stars are forming within them. It is believed the Sun lies on the e ...
... are divided into Sa, which have a strong bulge and tight indistinct arms, Sb, which are an intermediate type, and Sc, which have a small bulge and loose, well-defined arms. Stars in spiral galaxies tend to be of a medium age but new stars are forming within them. It is believed the Sun lies on the e ...
Slide 1
... Recall that the average speed of atoms in a cloud is one and the same as the cloud’s temperature. The atoms in hotter gases travel faster. In galaxy clusters, the combined gravity of all the galaxies tends to hold the intergalactic gas within the cluster. Consider: galactic clusters will retain gas, ...
... Recall that the average speed of atoms in a cloud is one and the same as the cloud’s temperature. The atoms in hotter gases travel faster. In galaxy clusters, the combined gravity of all the galaxies tends to hold the intergalactic gas within the cluster. Consider: galactic clusters will retain gas, ...
IMPLICATIONS OF EXTRASOLAR PLANETS FOR
... ■ Abstract The observed properties of extrasolar planets and planetary systems are reviewed, including discussion of the mass, period, and eccentricity distributions; the presence of multiple systems; and the properties of the host stars. In all cases, the data refer to systems with ages in the Ga r ...
... ■ Abstract The observed properties of extrasolar planets and planetary systems are reviewed, including discussion of the mass, period, and eccentricity distributions; the presence of multiple systems; and the properties of the host stars. In all cases, the data refer to systems with ages in the Ga r ...
My talk on CO at z=0 from Santiago in June, 2011
... A Preview of the Next 10 Years (‘10s) ALMA! Maturation of Wide-Field Receivers, Big Surveys An ALMA preview: the PAWS Survey (PI: E. Schinnerer) – PDBI 1” (50 pc) Map of M51: ...
... A Preview of the Next 10 Years (‘10s) ALMA! Maturation of Wide-Field Receivers, Big Surveys An ALMA preview: the PAWS Survey (PI: E. Schinnerer) – PDBI 1” (50 pc) Map of M51: ...
Astrophysics Lab “A”
... Hot, luminous stars = BRIGHT stars. See Fig. 1. • hot: effective temperature, Teff , of approx. 10,000 K . . . 50,000 K (spectral type A0 - O2) • luminous: 104 . . . some 106 times the energy output of the sun For comparison: the luminosity of the sun, L⊙ , is – 3.82 * 1033 erg/s = – 3.82 * 1026 Wat ...
... Hot, luminous stars = BRIGHT stars. See Fig. 1. • hot: effective temperature, Teff , of approx. 10,000 K . . . 50,000 K (spectral type A0 - O2) • luminous: 104 . . . some 106 times the energy output of the sun For comparison: the luminosity of the sun, L⊙ , is – 3.82 * 1033 erg/s = – 3.82 * 1026 Wat ...
Calculating Radial Velocities of Low Mass Eclipsing Binaries
... temperatures directly. By studying eclipsing binary pairs comprising one F, G, or K type star with an M type star, we are able to use what we know about the primary star to learn more about the secondary star. For example, measuring the orbital reflex motion of the primary star, together with the ec ...
... temperatures directly. By studying eclipsing binary pairs comprising one F, G, or K type star with an M type star, we are able to use what we know about the primary star to learn more about the secondary star. For example, measuring the orbital reflex motion of the primary star, together with the ec ...
Goal: To understand clusters of stars
... • Open clusters are YOUNG clusters that drift apart in about a billion years. • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
... • Open clusters are YOUNG clusters that drift apart in about a billion years. • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
General Relativity Einstein`s Theory of Gravity Paul Woodward
... light rays outside this boundary are able to expand away from the hole. The left edge of the horizon history diagram shows the shape of the initial configuration, corresponding to either two separate holes (if they are far enough apart initially), or two holes that are already merged into a single h ...
... light rays outside this boundary are able to expand away from the hole. The left edge of the horizon history diagram shows the shape of the initial configuration, corresponding to either two separate holes (if they are far enough apart initially), or two holes that are already merged into a single h ...
Goal: To understand clusters of stars
... • Open clusters are YOUNG clusters that drift apart in about a billion years. • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
... • Open clusters are YOUNG clusters that drift apart in about a billion years. • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
Astronomical units
... The color of a star or other object is defined as the difference in the magnitude in each of two bandpasses: e.g. the (B-V) color is: B-V = mB-mV Stars radiate roughly as blackbodies, so the color reflects surface temperature. Vega has T = 9500 K, by definition color is zero. Which sense for hotter ...
... The color of a star or other object is defined as the difference in the magnitude in each of two bandpasses: e.g. the (B-V) color is: B-V = mB-mV Stars radiate roughly as blackbodies, so the color reflects surface temperature. Vega has T = 9500 K, by definition color is zero. Which sense for hotter ...
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 ...
AST 207 Test 3 23 November 2009
... a. (1 pt.) At the present time, does the value of Hubble’s constant depend on the galaxy in which the observations are made? (2 pts.) Explain your reasoning. b. Simplicio erroneously believes that everything in the universe is expanding according to Hubble’s Law. At an earlier time, everything did o ...
... a. (1 pt.) At the present time, does the value of Hubble’s constant depend on the galaxy in which the observations are made? (2 pts.) Explain your reasoning. b. Simplicio erroneously believes that everything in the universe is expanding according to Hubble’s Law. At an earlier time, everything did o ...
Nucleosynthesis and Chemical Evolution of Oxygen
... only one particular model, its yields are fairly representative of the ejecta from any star more than ten times the mass of the Sun. Chemical evolution models using detailed stellar model yields have long shown that the Galaxy’s supply 16O is dominantly from massive stars (e.g., B. M. Tinsley 1980—“ ...
... only one particular model, its yields are fairly representative of the ejecta from any star more than ten times the mass of the Sun. Chemical evolution models using detailed stellar model yields have long shown that the Galaxy’s supply 16O is dominantly from massive stars (e.g., B. M. Tinsley 1980—“ ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.