Cosmic Distance Ladder
... Note that beyond the Virgo cluster, even very bright stars like Cepheids become unresolved and we see only the integrated light from galaxies. Further away than this, we must determine distances using the redshift of galaxies. ...
... Note that beyond the Virgo cluster, even very bright stars like Cepheids become unresolved and we see only the integrated light from galaxies. Further away than this, we must determine distances using the redshift of galaxies. ...
Archaeology of the Milky Way - Max-Planck
... down into its detailed colors, shown here by lines. Each of the dark stripes represents an absorption line that originates from a specific chemical element. The astronomers use such a spectrum to find out which material the star is composed of and when it was formed. ...
... down into its detailed colors, shown here by lines. Each of the dark stripes represents an absorption line that originates from a specific chemical element. The astronomers use such a spectrum to find out which material the star is composed of and when it was formed. ...
1. How old is our sun now? How does its present luminosity
... 5. Why have astronomers introduced the concept of dark matter? Give two cases where dark matter has been invoked to explain astronomical observations. There are cases where motions seem to require more gravitational force than can be provided by the observed (luminous) matter. Some examples are: (a ...
... 5. Why have astronomers introduced the concept of dark matter? Give two cases where dark matter has been invoked to explain astronomical observations. There are cases where motions seem to require more gravitational force than can be provided by the observed (luminous) matter. Some examples are: (a ...
Powerpoint
... will be entirely convective and will have a total binding energy that approaches zero as approaches zero. But the calculation applies to those surface layers which must stay bound. Completely convective stars with a luminosity proportional to mass have a constant lifetime, which is in fact the sho ...
... will be entirely convective and will have a total binding energy that approaches zero as approaches zero. But the calculation applies to those surface layers which must stay bound. Completely convective stars with a luminosity proportional to mass have a constant lifetime, which is in fact the sho ...
How the quasars (lower right) are different than brown dwarfs
... ultraviolet and blue optical light is absorbed and reemitted in the infrared which can be seen as bumps in the purple, blue and green curves (around a wavelength of 5 to 110 micron). You might have also noticed the "spikes" of emission in the SEDs around about 5 to 12 micron, these are caused by so- ...
... ultraviolet and blue optical light is absorbed and reemitted in the infrared which can be seen as bumps in the purple, blue and green curves (around a wavelength of 5 to 110 micron). You might have also noticed the "spikes" of emission in the SEDs around about 5 to 12 micron, these are caused by so- ...
Infinity Express
... The information and activities presented in the Infinity Express Teacher’s Guide have been adapted for use and distribution by OMSI from the following: Smithsonian National Air and Space Museum GLOSSARY ...
... The information and activities presented in the Infinity Express Teacher’s Guide have been adapted for use and distribution by OMSI from the following: Smithsonian National Air and Space Museum GLOSSARY ...
Reach for the Stars B
... 400 light years away, as compared to one that is 100 light years away? 80. How many times brighter/dimmer would the Sun appear from a colony on Mars (which orbits at 1.5 AU) than it does from Earth? 81. How many times brighter/dimmer would it be from a space station orbiting Venus (0.75 AU)? Suppose ...
... 400 light years away, as compared to one that is 100 light years away? 80. How many times brighter/dimmer would the Sun appear from a colony on Mars (which orbits at 1.5 AU) than it does from Earth? 81. How many times brighter/dimmer would it be from a space station orbiting Venus (0.75 AU)? Suppose ...
An automated 2 epoch Proper Motion search of UKIDSS and VISTA
... finding very cold brown dwarfs. Objects too faint for normal multiband colour selection, or those with unusual colours (e.g. recent WISE 300 K object). brown dwarf companions to stars. These are benchmark objects with known age, metallicity and Hipparcos distance that can be used to test model atmos ...
... finding very cold brown dwarfs. Objects too faint for normal multiband colour selection, or those with unusual colours (e.g. recent WISE 300 K object). brown dwarf companions to stars. These are benchmark objects with known age, metallicity and Hipparcos distance that can be used to test model atmos ...
June 2013 Kepler Space Telescope Update
... producing stellar flares and other outbursts. The team, therefore, searched planets around retired cluster stars. "Using Hubble to analyze the atmospheres of white dwarfs is the best method for finding the signatures of solid planet chemistry and determining their composition," Farihi explains. "Nor ...
... producing stellar flares and other outbursts. The team, therefore, searched planets around retired cluster stars. "Using Hubble to analyze the atmospheres of white dwarfs is the best method for finding the signatures of solid planet chemistry and determining their composition," Farihi explains. "Nor ...
The Masses and Lifetimes of Stars
... 1010 years. According to the mass-lifetime relation, a star with a mass of 10 Msun has a lifetime of: 1. 107 years 2. 3x107 years 3. 108 years 4. 3x108 years 5. 109 years 6. 1011 years 7. 3x1011 years ...
... 1010 years. According to the mass-lifetime relation, a star with a mass of 10 Msun has a lifetime of: 1. 107 years 2. 3x107 years 3. 108 years 4. 3x108 years 5. 109 years 6. 1011 years 7. 3x1011 years ...
Where Do Chemical Elements Come From?
... scientists use a technique known as visible spectroscopy. It is based on a device, called a spectroscope, which spreads visible light into its component colors by passing it through a prism or grating. Figure 1. When light emitted by hydrogen is spread These colors are called an emission spectrum, a ...
... scientists use a technique known as visible spectroscopy. It is based on a device, called a spectroscope, which spreads visible light into its component colors by passing it through a prism or grating. Figure 1. When light emitted by hydrogen is spread These colors are called an emission spectrum, a ...
Supernovae March 23 − Supernova 1987A
... Degeneracy pressure prevents temperature from rising. Carbon burning. That is wrong; the sun will become a supernova. ...
... Degeneracy pressure prevents temperature from rising. Carbon burning. That is wrong; the sun will become a supernova. ...
Powerpoint
... •Luminosity up the vertical axis (measured relative to the Sun) •Temperature along the horizontal axis (measured in Kelvin) The stars Vega and Sirius are brighter than the Sun, and also hotter. Where would you put them? Where would you mark the Sun on the plot? ...
... •Luminosity up the vertical axis (measured relative to the Sun) •Temperature along the horizontal axis (measured in Kelvin) The stars Vega and Sirius are brighter than the Sun, and also hotter. Where would you put them? Where would you mark the Sun on the plot? ...
Star in a Box - Las Cumbres Observatory Global Telescope
... •Luminosity up the vertical axis (measured relative to the Sun) •Temperature along the horizontal axis (measured in Kelvin) The stars Vega and Sirius are brighter than the Sun, and also hotter. Where would you put them? Where would you mark the Sun on the plot? ...
... •Luminosity up the vertical axis (measured relative to the Sun) •Temperature along the horizontal axis (measured in Kelvin) The stars Vega and Sirius are brighter than the Sun, and also hotter. Where would you put them? Where would you mark the Sun on the plot? ...
X-ray binaries
... The latest large catalogue (Li et al. arXiv: 0707.0544) includes 187 galactic and Magellanic Clouds LMXBs with NSs and BHs as accreting components. Donors can be WDs, or normal low-mass stars (main sequence or sub-giants). Many sources are found in globular clusters. Also there are more and more LMX ...
... The latest large catalogue (Li et al. arXiv: 0707.0544) includes 187 galactic and Magellanic Clouds LMXBs with NSs and BHs as accreting components. Donors can be WDs, or normal low-mass stars (main sequence or sub-giants). Many sources are found in globular clusters. Also there are more and more LMX ...
Astronomy 120
... 1. Zeilik Study Exercise 16.1 In a short paragraph, describe the primary characteristics of a white dwarf? 2. Zeilik Study Exercise 16.2 In a short paragraph, describe to a friend who has not studied astronomy the chief features of a neutron star. 3. Zeilik Study Exercise 16.5 Assuming no loss of ma ...
... 1. Zeilik Study Exercise 16.1 In a short paragraph, describe the primary characteristics of a white dwarf? 2. Zeilik Study Exercise 16.2 In a short paragraph, describe to a friend who has not studied astronomy the chief features of a neutron star. 3. Zeilik Study Exercise 16.5 Assuming no loss of ma ...
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.