Mar 2017 - What`s Out Tonight?
... cury, Venus, Mars, Jupiter and Saturn. Venus is extremely bright Open clusters reside in our Milky Way Galaxy. Our Sun is no and hugs close to the Sun, so you see it for a short time in the longer in its group. west after sunset or in the east before sunrise. Jupiter can be out Globular Clusters loo ...
... cury, Venus, Mars, Jupiter and Saturn. Venus is extremely bright Open clusters reside in our Milky Way Galaxy. Our Sun is no and hugs close to the Sun, so you see it for a short time in the longer in its group. west after sunset or in the east before sunrise. Jupiter can be out Globular Clusters loo ...
The Missing Mass
... • Many of the stars will be faint, red main sequence stars, but some will be bright blue O and B stars. These stars will continue to drift through the region. • The O and B stars don’t go far before they go supernova. The brightest (and bluest) of a galaxy’s stars will never be far from the spiral a ...
... • Many of the stars will be faint, red main sequence stars, but some will be bright blue O and B stars. These stars will continue to drift through the region. • The O and B stars don’t go far before they go supernova. The brightest (and bluest) of a galaxy’s stars will never be far from the spiral a ...
Lab 6
... class of variable stars called the Cepheids. These stars vary in brightness in a cyclical pattern, and are bright enough to be seen within another galaxy. Leavitt determined that absolute magnitude (M) of a Cepheid variable was mathematically related to the period (P, measured in days) of its bright ...
... class of variable stars called the Cepheids. These stars vary in brightness in a cyclical pattern, and are bright enough to be seen within another galaxy. Leavitt determined that absolute magnitude (M) of a Cepheid variable was mathematically related to the period (P, measured in days) of its bright ...
HR Diagram, Star Clusters, and Stellar Evolution
... • A RG brightens by a factor of between 1,000 and 10,000. The outer, hydrogen-rich envelope swells up to a few au radius, with T ~ 2,000 - 3,000 K • A strong stellar wind begins to blow from the star's surface (akin to the Sun's solar wind, but much stronger), and, in the course of the star's RG l ...
... • A RG brightens by a factor of between 1,000 and 10,000. The outer, hydrogen-rich envelope swells up to a few au radius, with T ~ 2,000 - 3,000 K • A strong stellar wind begins to blow from the star's surface (akin to the Sun's solar wind, but much stronger), and, in the course of the star's RG l ...
The Birth of Stars
... Clumps of glowing gas called Herbig-Haro objects are sometimes found along these jets and at their ends ...
... Clumps of glowing gas called Herbig-Haro objects are sometimes found along these jets and at their ends ...
The Birth of Stars Guiding Questions • Because stars shine by
... Clumps of glowing gas called Herbig-Haro objects are sometimes found along these jets and at their ends ...
... Clumps of glowing gas called Herbig-Haro objects are sometimes found along these jets and at their ends ...
Practice Questions for Final
... B. It would mean the distance to the Andromeda Galaxy is 10% less than we thought. C. It would not have any effect on our estimate of the distance to the Andromeda Galaxy. D. It would mean that all the objects we've assumed are standard candles really are not good standard candles, and therefore tha ...
... B. It would mean the distance to the Andromeda Galaxy is 10% less than we thought. C. It would not have any effect on our estimate of the distance to the Andromeda Galaxy. D. It would mean that all the objects we've assumed are standard candles really are not good standard candles, and therefore tha ...
Stellar Lives (continued). Galaxies.
... The CNO cycle is the chain of reactions that leads to hydrogen fusion in high-mass stars. The escalated fusion rate of the CNO cycle produces many more photons than in low-mass stars. The photons have no mass, but carry momentum. They transfer the momentum to anything the run into. The result is rad ...
... The CNO cycle is the chain of reactions that leads to hydrogen fusion in high-mass stars. The escalated fusion rate of the CNO cycle produces many more photons than in low-mass stars. The photons have no mass, but carry momentum. They transfer the momentum to anything the run into. The result is rad ...
Winter Stargazing - Trimble County Schools
... • Distance-400 LY • Diameter-30 LY • The most famous and beautiful star cluster is just north of Taurus. • The brightest of these bluish stars are perfectly visible to the unaided eye. • All the stars in Pleiades were born about the same time, about 70 Million years ago. ...
... • Distance-400 LY • Diameter-30 LY • The most famous and beautiful star cluster is just north of Taurus. • The brightest of these bluish stars are perfectly visible to the unaided eye. • All the stars in Pleiades were born about the same time, about 70 Million years ago. ...
May 2017 - What`s Out Tonight?
... cury, Venus, Mars, Jupiter and Saturn. Venus is extremely bright Open clusters reside in our Milky Way Galaxy. Our Sun is no and hugs close to the Sun, so you see it for a short time in the longer in its group. west after sunset or in the east before sunrise. Jupiter can be out Globular Clusters loo ...
... cury, Venus, Mars, Jupiter and Saturn. Venus is extremely bright Open clusters reside in our Milky Way Galaxy. Our Sun is no and hugs close to the Sun, so you see it for a short time in the longer in its group. west after sunset or in the east before sunrise. Jupiter can be out Globular Clusters loo ...
Stellar Pops 2
... thoughout the volume of space to the Virgo Cluster? – What are the star-formation histories for gE galaxies? – Is there a Universal `floor’ to the MDF? – Are there IMF variations as evidenced by element mixes in different galaxies? – Detailed understanding of galaxies at z=0 is crucial to interpreta ...
... thoughout the volume of space to the Virgo Cluster? – What are the star-formation histories for gE galaxies? – Is there a Universal `floor’ to the MDF? – Are there IMF variations as evidenced by element mixes in different galaxies? – Detailed understanding of galaxies at z=0 is crucial to interpreta ...
Stellar Evolution (Formation)
... The characteristic mass of these dense cores is ~ 10 Msun so they are unstable to gravitational collapse - consistent with them being sites of star formation. ...
... The characteristic mass of these dense cores is ~ 10 Msun so they are unstable to gravitational collapse - consistent with them being sites of star formation. ...
Chapter11
... contracting star and gives it stability? We can understand this phenomenon because we understand some of the basic laws of physics. ...
... contracting star and gives it stability? We can understand this phenomenon because we understand some of the basic laws of physics. ...
Lecture Eight (Powerpoint format) - Flash
... Giant Molecular clouds -- very dense and cold (by ISM standards) -hundreds of thousands of molecules per cubic centimeter, tens of degrees. Location of all known star formation. Coronal phase -- very hot (millions of degrees), heated by powerful blasts from supernovae. Diffuse, not concentrated ...
... Giant Molecular clouds -- very dense and cold (by ISM standards) -hundreds of thousands of molecules per cubic centimeter, tens of degrees. Location of all known star formation. Coronal phase -- very hot (millions of degrees), heated by powerful blasts from supernovae. Diffuse, not concentrated ...
Milky Way I
... • The thickness of the disk is only 300pc (1000 light years) on average. • The total detectable mass is 200 billion solar masses. ...
... • The thickness of the disk is only 300pc (1000 light years) on average. • The total detectable mass is 200 billion solar masses. ...
Lecture 12
... This tells us that the Universe is expanding and we can get an age estimate for the Universe, but for now we can just use it as a distance estimator. If a galaxy is receding at 7000 km/s, its redshift distance is ~100 Mpc. This works if the Hubble velocity is high enough to washout peculiar local mo ...
... This tells us that the Universe is expanding and we can get an age estimate for the Universe, but for now we can just use it as a distance estimator. If a galaxy is receding at 7000 km/s, its redshift distance is ~100 Mpc. This works if the Hubble velocity is high enough to washout peculiar local mo ...
Stellar Evolution Chapter 12
... b. Objects below this mass can only form in HI clouds. c. Objects below this mass are not hot enough to fuse normal hydrogen. d. They form too slowly and hot stars nearby clear the gas and dust quickly. e. Our telescopes do not have enough light gathering power to detect dim objects. ...
... b. Objects below this mass can only form in HI clouds. c. Objects below this mass are not hot enough to fuse normal hydrogen. d. They form too slowly and hot stars nearby clear the gas and dust quickly. e. Our telescopes do not have enough light gathering power to detect dim objects. ...
Feb 2017 - What`s Out Tonight?
... cury, Venus, Mars, Jupiter and Saturn. Venus is extremely bright Open clusters reside in our Milky Way Galaxy. Our Sun is no and hugs close to the Sun, so you see it for a short time in the longer in its group. west after sunset or in the east before sunrise. Jupiter can be out Globular Clusters loo ...
... cury, Venus, Mars, Jupiter and Saturn. Venus is extremely bright Open clusters reside in our Milky Way Galaxy. Our Sun is no and hugs close to the Sun, so you see it for a short time in the longer in its group. west after sunset or in the east before sunrise. Jupiter can be out Globular Clusters loo ...
Fulltext PDF
... it gets hotter it burns hydrogen just like our own Sun. The star is now beginning to shine quite brightly, and the radiation from the star prevents further material accreting onto the star, and may even begin to disperse the remaining material in the disc that still surrounds the star. Once the star ...
... it gets hotter it burns hydrogen just like our own Sun. The star is now beginning to shine quite brightly, and the radiation from the star prevents further material accreting onto the star, and may even begin to disperse the remaining material in the disc that still surrounds the star. Once the star ...
PH607lec08
... between recession velocity and distance. (Type Ia supernova). The Hubble law defines a special frame of reference at any point in the Universe. An observer with a large motion with respect to the Hubble flow would measure blueshifts in front and large redshifts behind, instead of the same redshifts ...
... between recession velocity and distance. (Type Ia supernova). The Hubble law defines a special frame of reference at any point in the Universe. An observer with a large motion with respect to the Hubble flow would measure blueshifts in front and large redshifts behind, instead of the same redshifts ...
chapter 26 instructor notes
... abundant than spirals in rich clusters of galaxies, for example. Computer simulations have confirmed the possibility of such a mechanism, but keep in mind that computer simulations have reproduced a variety of possible galaxy scenarios, some of which have not yet been observed. ...
... abundant than spirals in rich clusters of galaxies, for example. Computer simulations have confirmed the possibility of such a mechanism, but keep in mind that computer simulations have reproduced a variety of possible galaxy scenarios, some of which have not yet been observed. ...
Milky Way
... •When a low mass object orbits a high mass object, there is a simple relationship between the distance and the velocity: ...
... •When a low mass object orbits a high mass object, there is a simple relationship between the distance and the velocity: ...
The Next 2-3 Weeks
... Distances to Cepheids relative to LMC distance Magellanic Clouds Used these to calibrate secondary distance indicators M31 ...
... Distances to Cepheids relative to LMC distance Magellanic Clouds Used these to calibrate secondary distance indicators M31 ...
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.