Lives of Stars - Amazon Web Services
... these stages, but you know the stages exist. Astronomers have a similar problem in trying to understand how stars age. They can't watch a single star for billions of years. Instead, they study many stars and other objects in space. Over time, astronomers have figured out that these objects represent ...
... these stages, but you know the stages exist. Astronomers have a similar problem in trying to understand how stars age. They can't watch a single star for billions of years. Instead, they study many stars and other objects in space. Over time, astronomers have figured out that these objects represent ...
V Example: our SUN (G2V)
... Denser stars with higher surface gravity will exhibit greater pressure broadening of spectral lines. Since the radius of a giant star is much greater than a dwarf star while their masses are roughly comparable, the gravity and thus the gas density and pressure on the surface of a giant star are much ...
... Denser stars with higher surface gravity will exhibit greater pressure broadening of spectral lines. Since the radius of a giant star is much greater than a dwarf star while their masses are roughly comparable, the gravity and thus the gas density and pressure on the surface of a giant star are much ...
Introduction to the HR Diagram
... surrounding the helium core of the star; however the temperature is not high enough for this hydrogen to burn. As the star begins to contract, the core gets hot enough to start a thin shell of hydrogen burning around the helium core. The increase in radiation pressure causes the star's outer atmosph ...
... surrounding the helium core of the star; however the temperature is not high enough for this hydrogen to burn. As the star begins to contract, the core gets hot enough to start a thin shell of hydrogen burning around the helium core. The increase in radiation pressure causes the star's outer atmosph ...
Deep Space (PDF: 224k)
... a slowly cooling ball of gas that fades from a dull red glow into the infrared as it cools in a few tens of millions of years. A graph of the luminosity versus temperature (called a Hertzsprung-Russell diagram) of all stars show that most of the stars in the sky, about 90 percent, fall in a line cal ...
... a slowly cooling ball of gas that fades from a dull red glow into the infrared as it cools in a few tens of millions of years. A graph of the luminosity versus temperature (called a Hertzsprung-Russell diagram) of all stars show that most of the stars in the sky, about 90 percent, fall in a line cal ...
Week 11 Concept Summary
... blocks visible light and only allows us to see nearby stars in the plane of the galaxy, though radio and infrared light can get through it easily. Stars collapse and form from the ISM, build up more heavy elements, and then recycle their enriched gas back to the ISM through stellar winds, pletary ne ...
... blocks visible light and only allows us to see nearby stars in the plane of the galaxy, though radio and infrared light can get through it easily. Stars collapse and form from the ISM, build up more heavy elements, and then recycle their enriched gas back to the ISM through stellar winds, pletary ne ...
poster
... cluster members are found around the reddening slope in the CMD, indicating that their color changes are caused by variable extinction (reddening). In contrast, only cluster members have slopes where the source becomes more blue as it fades (bluening). A change in the inner disk radius can cause thi ...
... cluster members are found around the reddening slope in the CMD, indicating that their color changes are caused by variable extinction (reddening). In contrast, only cluster members have slopes where the source becomes more blue as it fades (bluening). A change in the inner disk radius can cause thi ...
High Mass Stars
... – From H-R diagram its luminosity is 100000 times greater than the Sun’s. – It therefore burns fuel (uses it’s mass) 100000 times faster than the Sun. – It has 25 times the mass of the Sun so its lifetime will be 25/100000 = 0.00025 times than the Sun’s lifetime = 2.5 million years. ...
... – From H-R diagram its luminosity is 100000 times greater than the Sun’s. – It therefore burns fuel (uses it’s mass) 100000 times faster than the Sun. – It has 25 times the mass of the Sun so its lifetime will be 25/100000 = 0.00025 times than the Sun’s lifetime = 2.5 million years. ...
Our Solar System 6.1 Planets 6.2 Dwarf planets and other solar
... In space, most (90%) of all stars are actually double-star systems in which two stars orbit each other. This close orbit prohibits any planets from forming. Our solo star system gave way for planets to form. It is thought by astronomers that had the material that formed the outer (Jovian) planets be ...
... In space, most (90%) of all stars are actually double-star systems in which two stars orbit each other. This close orbit prohibits any planets from forming. Our solo star system gave way for planets to form. It is thought by astronomers that had the material that formed the outer (Jovian) planets be ...
The Distribution of Stars Most Likely to Harbor Intelligent Life
... We wish to model the probability, P (M ), that a star of given mass M has one or more terrestrial planets within its habitable zone (HZ). The HZ around a star is the radial band ∆rHZ within which an Earth-like planet could support surface liquid water. The inner and outer HZ radii are determined by ...
... We wish to model the probability, P (M ), that a star of given mass M has one or more terrestrial planets within its habitable zone (HZ). The HZ around a star is the radial band ∆rHZ within which an Earth-like planet could support surface liquid water. The inner and outer HZ radii are determined by ...
our knowledge of high-mass star formation at the dawn of - CEA-Irfu
... Theoretically, the copious UV flux emitted by a stellar embryo of more than 8 M⊙ heats and ionizes its parental molecular cloud, leading to the formation and development of a hot core and an H ii region. These physical and chemical feedback processes are difficult to treat but must be added in analy ...
... Theoretically, the copious UV flux emitted by a stellar embryo of more than 8 M⊙ heats and ionizes its parental molecular cloud, leading to the formation and development of a hot core and an H ii region. These physical and chemical feedback processes are difficult to treat but must be added in analy ...
Part1
... Scaling Relations: Mass and Metallicity Relation to Millimeter and IR astronomy: o The infrared continuum is a key tracer of the distribution of dust and the dust-to-gas ratio is intimately related to heavy element enrichment (e.g., you need dust to see IR!). o Along similar lines, millimeter line ...
... Scaling Relations: Mass and Metallicity Relation to Millimeter and IR astronomy: o The infrared continuum is a key tracer of the distribution of dust and the dust-to-gas ratio is intimately related to heavy element enrichment (e.g., you need dust to see IR!). o Along similar lines, millimeter line ...
Frank Timmes (ASU)
... 1. SN Ia 2011fe (M101) discovered by the Palomar Transient Factory about 11 hours after the explosion. No evidence for circumbinary material and progenitor likely a CO WD. 2. However, PTF 11kx was a SN Ia that exploded in a system with circumbinary material and they suggest that the progenitor was a ...
... 1. SN Ia 2011fe (M101) discovered by the Palomar Transient Factory about 11 hours after the explosion. No evidence for circumbinary material and progenitor likely a CO WD. 2. However, PTF 11kx was a SN Ia that exploded in a system with circumbinary material and they suggest that the progenitor was a ...
featured in the Arizona Daily Star
... piece of a star and study it in the laboratory. That’s what I do — I study pieces of ancient stardust. But instead of using a telescope, I use a microscope to look for stardust inside meteorites. Over their lifetimes, stars shed matter that can condense into solid mineral grains — stardust — if cond ...
... piece of a star and study it in the laboratory. That’s what I do — I study pieces of ancient stardust. But instead of using a telescope, I use a microscope to look for stardust inside meteorites. Over their lifetimes, stars shed matter that can condense into solid mineral grains — stardust — if cond ...
ph709-14
... This disk around Beta Pictoris is probably connected with a planetary system. The disk does not start at the star. Rather, its inner edge begins around 25 AU away, farther than the average orbital distance of Uranus in the Solar System. Its outer edge appears to extend as far out as 550 AUs away fro ...
... This disk around Beta Pictoris is probably connected with a planetary system. The disk does not start at the star. Rather, its inner edge begins around 25 AU away, farther than the average orbital distance of Uranus in the Solar System. Its outer edge appears to extend as far out as 550 AUs away fro ...
pluto: a human comedy
... mass, with the density decreasing smoothly with increasing distance from the Sun, until Neptune, where there seemed to be an apparent edge. The only known object beyond Neptune at that time was Pluto. But Pluto is so tiny that its mass would not make much contribution. They speculated that, if the e ...
... mass, with the density decreasing smoothly with increasing distance from the Sun, until Neptune, where there seemed to be an apparent edge. The only known object beyond Neptune at that time was Pluto. But Pluto is so tiny that its mass would not make much contribution. They speculated that, if the e ...
– 1 – 1. Chemical Evolution 1.1.
... of source terms which are of the general form shown above, namely an integral over a range of stellar mass times a production rate Qi (t) and the initial mass function. These can be from various types of supernovae, novae, AGB stars, or any other source. There is another equation which gives the tot ...
... of source terms which are of the general form shown above, namely an integral over a range of stellar mass times a production rate Qi (t) and the initial mass function. These can be from various types of supernovae, novae, AGB stars, or any other source. There is another equation which gives the tot ...
updated
... When a star is fusing energy in its core, it is stable. When the core is collapsing to reach a new equilibrium configuration, the heat from that collapse supports shell burning and the envelope of the star expands. Each new phase of stellar evolution is marked by a shorter duration as each is suppor ...
... When a star is fusing energy in its core, it is stable. When the core is collapsing to reach a new equilibrium configuration, the heat from that collapse supports shell burning and the envelope of the star expands. Each new phase of stellar evolution is marked by a shorter duration as each is suppor ...