Activity III: Calibrating Images
... just that it remains constant. For images of objects beyond our own galaxy, foreground stars are typically chosen. These are stars within our galaxy that are in the same line of sight to the further away object. If the observing conditions did not change from one night to the next, the reference sta ...
... just that it remains constant. For images of objects beyond our own galaxy, foreground stars are typically chosen. These are stars within our galaxy that are in the same line of sight to the further away object. If the observing conditions did not change from one night to the next, the reference sta ...
Magnitude Scales and Photometric Systems
... Technological advances over the last 100 yr have provided a series of light detectors to supplement the eye. These detectors, in general, respond differently to light of different wavelengths from the eye; that is, they are more sensitive to blue light or to red light than is the eye. The advent of ...
... Technological advances over the last 100 yr have provided a series of light detectors to supplement the eye. These detectors, in general, respond differently to light of different wavelengths from the eye; that is, they are more sensitive to blue light or to red light than is the eye. The advent of ...
The Physics of Star Formation: Understanding the Youngest Protostars
... stars which have dissipated their disks and may have completed their planet formation (Class III SED). Although we have made considerable progress in observing and understanding pre{ main sequence evolution (Class II and III phases), the earliest phases of star formation { the events which lead to C ...
... stars which have dissipated their disks and may have completed their planet formation (Class III SED). Although we have made considerable progress in observing and understanding pre{ main sequence evolution (Class II and III phases), the earliest phases of star formation { the events which lead to C ...
Process of Science: PreMainSequence Stellar Life Tracks on the HR
... If you watch the position of the red dot on the HR diagram as the interactive figure plays, you will see that the dot is highest — meaning the object is most luminous— when it is a protostar and therefore does not yet have internal fusion. This fact can be a little surprising, but do not forget tha ...
... If you watch the position of the red dot on the HR diagram as the interactive figure plays, you will see that the dot is highest — meaning the object is most luminous— when it is a protostar and therefore does not yet have internal fusion. This fact can be a little surprising, but do not forget tha ...
1. INTRODUCTION
... a Doppler precision of D10 m s~1 (cf. Marcy, Cochran, & Mayor 2000 ; Noyes et al. 1997). These ““ planets ÏÏ all have mass estimates, M sin i, less than 7.5 M , where i is the JUP unknown orbital inclination. Interestingly, these precision Doppler surveys, along with low-precision surveys of several ...
... a Doppler precision of D10 m s~1 (cf. Marcy, Cochran, & Mayor 2000 ; Noyes et al. 1997). These ““ planets ÏÏ all have mass estimates, M sin i, less than 7.5 M , where i is the JUP unknown orbital inclination. Interestingly, these precision Doppler surveys, along with low-precision surveys of several ...
Early stages of clustered star formation -massive dark clouds
... Figure 1.2: Illustration of the evolution of the SED during pre- and proto-stellar stages. Adapted from (Lada & Wilking 1984; Andre & Montmerle 1994). – Class 0 – The SED resembles a blackbody spectrum at a temperature below 30 K, peaking at sub-mm wavelengths ( 100 μm). – Class I – The peak of the ...
... Figure 1.2: Illustration of the evolution of the SED during pre- and proto-stellar stages. Adapted from (Lada & Wilking 1984; Andre & Montmerle 1994). – Class 0 – The SED resembles a blackbody spectrum at a temperature below 30 K, peaking at sub-mm wavelengths ( 100 μm). – Class I – The peak of the ...
Chapter 8 Pre-galactic enrichment of the IGM 8.1 Summary
... created per Population III supernova. Abel et al. [39] and Bromm et al. [42] both suggest that the first population of stars will be very massive. The mass function of the first generation of stars is unclear, due to lack of resolution and appropriate physics. The main-sequence mass of the star stro ...
... created per Population III supernova. Abel et al. [39] and Bromm et al. [42] both suggest that the first population of stars will be very massive. The mass function of the first generation of stars is unclear, due to lack of resolution and appropriate physics. The main-sequence mass of the star stro ...
Coordinate Systems - AST 114, Astronomy Lab II for Spring 2017!
... The ecliptic is the apparent path of the Sun, Moon, and planets as seen from the Earth. In another sense, the ecliptic is the path of the Earth’s orbit projected onto the sky. The orbits of the Earth and most of the other planets move in a relatively flat plane around the Sun. ...
... The ecliptic is the apparent path of the Sun, Moon, and planets as seen from the Earth. In another sense, the ecliptic is the path of the Earth’s orbit projected onto the sky. The orbits of the Earth and most of the other planets move in a relatively flat plane around the Sun. ...
PH607 – Galaxies
... Components: Almost 90% of its mass cannot be accounted for (the "dark matter" problem). The Local Group: It then goes on to consider how the Milky Way fits in with what we see in other galaxies, and what the morphologies of these systems tell us about their life histories. Evolution: Galaxies are no ...
... Components: Almost 90% of its mass cannot be accounted for (the "dark matter" problem). The Local Group: It then goes on to consider how the Milky Way fits in with what we see in other galaxies, and what the morphologies of these systems tell us about their life histories. Evolution: Galaxies are no ...
Slide 1
... low mass, hard to detect Kuiper belt like discs. Observations find hot, dusty discs within tidal radius Can we link the two populations? Maybe the Kuiper-belts provide the reservoir of material required to replenish the hot discs? We just need a mechanism to move the ...
... low mass, hard to detect Kuiper belt like discs. Observations find hot, dusty discs within tidal radius Can we link the two populations? Maybe the Kuiper-belts provide the reservoir of material required to replenish the hot discs? We just need a mechanism to move the ...
Chapter 17--Star Stuff
... The length of time from the formation of a protostar to the birth of a main-sequence star depends on the star’s mass. Massive stars do everything faster. The contraction of a high-mass protostar into a main-sequence star may take only a million years or less. A star like our Sun takes about 50 milli ...
... The length of time from the formation of a protostar to the birth of a main-sequence star depends on the star’s mass. Massive stars do everything faster. The contraction of a high-mass protostar into a main-sequence star may take only a million years or less. A star like our Sun takes about 50 milli ...
CHP 15
... b. map the location of Hot O and B stars by the radio radiation they emit. c. reveal that the spiral arms are winding up and growing closer together. d. reveal that the sun is currently located in the center of a spiral arm. e. map the location of dense neutral hydrogen clouds. ____ 23. Halo stars l ...
... b. map the location of Hot O and B stars by the radio radiation they emit. c. reveal that the spiral arms are winding up and growing closer together. d. reveal that the sun is currently located in the center of a spiral arm. e. map the location of dense neutral hydrogen clouds. ____ 23. Halo stars l ...
Stellar Evolution Task
... Red giants are sooo large that we can actually 'see' their size. Sadly we have to use very special techniques and can't just look through a very large telescope. Many bright red stars we see in the sky are red giants. ...
... Red giants are sooo large that we can actually 'see' their size. Sadly we have to use very special techniques and can't just look through a very large telescope. Many bright red stars we see in the sky are red giants. ...
Searching for Dwarf Galaxies and Population III Star
... sources is the chemically unevolved surroundings of a large galaxy or proto-cluster of galaxies at high redshift. The central sources are likely to have ionized a local “bubble” through which strong Lyman emission can escape from surrounding dwarf galaxies. Thus, near-infrared observations of thes ...
... sources is the chemically unevolved surroundings of a large galaxy or proto-cluster of galaxies at high redshift. The central sources are likely to have ionized a local “bubble” through which strong Lyman emission can escape from surrounding dwarf galaxies. Thus, near-infrared observations of thes ...
Comparison of low- and high-mass star formation
... object is located near the minimum of the global potential well and accretes the global collapse-fed material at a rate higher than any other object. Nevertheless, its accretion rate is only ∼10% of the total rate. In other words, the vast majority of the globally collapsing flow is diverted to star ...
... object is located near the minimum of the global potential well and accretes the global collapse-fed material at a rate higher than any other object. Nevertheless, its accretion rate is only ∼10% of the total rate. In other words, the vast majority of the globally collapsing flow is diverted to star ...
On the nature and detectability of Type Ib/c supernova progenitors
... Some of the helium stars in this figure (YWL9, YWL14 and YWL21) end their lives while they are filling their Rochelobes during Case ABB or BB mass transfer (i.e., mass transfer from the He star during/after the carbon-oxygen core contraction phase; see Yoon et al. 2010 for more details). For compari ...
... Some of the helium stars in this figure (YWL9, YWL14 and YWL21) end their lives while they are filling their Rochelobes during Case ABB or BB mass transfer (i.e., mass transfer from the He star during/after the carbon-oxygen core contraction phase; see Yoon et al. 2010 for more details). For compari ...
University of Groningen Weak Interactions in Neutron Stars van
... Thirrlly. thc anisotropic rreutrirro ernissiori dne to p:rrity violatiorr in the wcak irrtcrz-lctionis considcrecl. Irr tlie rionrelativistic lirnit the ncutrino-pair brensstr:rlihrng proccss is parity conservirrg. Therefore. it is rurimport:rnt. At about thc liighest surface magrrctic ficlcl rneasu ...
... Thirrlly. thc anisotropic rreutrirro ernissiori dne to p:rrity violatiorr in the wcak irrtcrz-lctionis considcrecl. Irr tlie rionrelativistic lirnit the ncutrino-pair brensstr:rlihrng proccss is parity conservirrg. Therefore. it is rurimport:rnt. At about thc liighest surface magrrctic ficlcl rneasu ...
Journey through the cosmos
... It is called the Milky Way because it looks like a giant splash or river of milk across a dark sky. But you probably haven’t seen it look like this, unless you live somewhere a long way away from a town. Until 150 years ago, the Milky Way was the most obvious thing in the night sky. Light pollution ...
... It is called the Milky Way because it looks like a giant splash or river of milk across a dark sky. But you probably haven’t seen it look like this, unless you live somewhere a long way away from a town. Until 150 years ago, the Milky Way was the most obvious thing in the night sky. Light pollution ...
Science East Meteor Radiant Worksheet finished
... Meteors: Pieces of this dust or debris that enter the atmosphere and burns up. These are also known as ‘shooting stars’ or ‘falling stars’. Most burn up and never land at the surface. Fireball: Is simply a very bright meteor, generated by a larger chunk or rock. Fireballs can make it to the ground, ...
... Meteors: Pieces of this dust or debris that enter the atmosphere and burns up. These are also known as ‘shooting stars’ or ‘falling stars’. Most burn up and never land at the surface. Fireball: Is simply a very bright meteor, generated by a larger chunk or rock. Fireballs can make it to the ground, ...
Chapters 12 and 13 Review: The Life Cycle and Death of Stars
... • A star remains on the main sequence as long as it can fuse hydrogen into helium in its core. – About 90% of total lifetime is spent on main sequence – Stable energy generation during this phase. • Once the core H fuel is gone, the star evolves rapidly off the main-sequence, spending much o ...
... • A star remains on the main sequence as long as it can fuse hydrogen into helium in its core. – About 90% of total lifetime is spent on main sequence – Stable energy generation during this phase. • Once the core H fuel is gone, the star evolves rapidly off the main-sequence, spending much o ...
Age Aspects of Habitability
... most intriguing question driving the search for habitable planets is whether they host life. But is the age of the planet important for its habitability? If we define habitability as the ability of a planet to beget life, then probably it is not. After all, life on Earth has developed within only 80 ...
... most intriguing question driving the search for habitable planets is whether they host life. But is the age of the planet important for its habitability? If we define habitability as the ability of a planet to beget life, then probably it is not. After all, life on Earth has developed within only 80 ...
Chromospherically young, kinematically old stars
... which are given with formal uncertainties. The last column shows the velocity criteria used in order to classify the object as a CYKOS. The results also show that CYKOS are generally more apparent in V than in the other velocity components, as expected for a kinematically old stellar population: the ...
... which are given with formal uncertainties. The last column shows the velocity criteria used in order to classify the object as a CYKOS. The results also show that CYKOS are generally more apparent in V than in the other velocity components, as expected for a kinematically old stellar population: the ...
Lyra
Lyra (/ˈlaɪərə/; Latin for lyre, from Greek λύρα) is a small constellation. It is one of 48 listed by the 2nd century astronomer Ptolemy, and is one of the 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star maps as a vulture or an eagle carrying a lyre, and hence sometimes referred to as Aquila Cadens or Vultur Cadens. Beginning at the north, Lyra is bordered by Draco, Hercules, Vulpecula, and Cygnus. Lyra is visible from the northern hemisphere from spring through autumn, and nearly overhead, in temperate latitudes, during the summer months. From the southern hemisphere, it is visible low in the northern sky during the winter months.The lucida or brightest star—and one of the brightest stars in the sky—is the white main sequence star Vega, a corner of the Summer Triangle. Beta Lyrae is the prototype of a class of stars known as Beta Lyrae variables, binary stars so close to each other that they become egg-shaped and material flows from one to the other. Epsilon Lyrae, known informally as the Double Double, is a complex multiple star system. Lyra also hosts the Ring Nebula, the second-discovered and best-known planetary nebula.