THE MASS OF A STELLAR BLACK HOLE Andrea Massi
... The light cannot escape a black hole. Therefore, we cannot observe directly this celestial body and at first glance it seems very difficult to calculate its mass. ...
... The light cannot escape a black hole. Therefore, we cannot observe directly this celestial body and at first glance it seems very difficult to calculate its mass. ...
Teacher Guide Lives of Stars
... “Our galaxy, by conservative estimates, contains 100 billion stars. The small number of stars we can see at night are the nearby stars in our tiny neighborhood of our galaxy. Stars are not eternal, but live long lives compared to our lifetime. Over time they change. Just like you can look at a famil ...
... “Our galaxy, by conservative estimates, contains 100 billion stars. The small number of stars we can see at night are the nearby stars in our tiny neighborhood of our galaxy. Stars are not eternal, but live long lives compared to our lifetime. Over time they change. Just like you can look at a famil ...
Chapter 1 - A Modern View of the Universe
... You will need to register your clickers by going to your Blackboard page for this course and clicking on “Register Clickers Here”, and inputting the 6digit code after the words: Device ID (some of the digits are letters) on the back of the clicker ...
... You will need to register your clickers by going to your Blackboard page for this course and clicking on “Register Clickers Here”, and inputting the 6digit code after the words: Device ID (some of the digits are letters) on the back of the clicker ...
Today: Magnitude Terminology Photometry Applications Reading
... Vega); typically obtained by calculating differential magnitude w.r.t. a known standard star. ...
... Vega); typically obtained by calculating differential magnitude w.r.t. a known standard star. ...
Events - Temecula Valley Astronomers
... the Almagest. It was produced sometime in the mid-100s AD. Ptolemy applied a system of brightnesses that originated with Hipparchus. The brightest stars were said to be 1 st magnitude. The faintest stars were said to be 6th magnitude. This is the ancient origin of the system we still use in modern a ...
... the Almagest. It was produced sometime in the mid-100s AD. Ptolemy applied a system of brightnesses that originated with Hipparchus. The brightest stars were said to be 1 st magnitude. The faintest stars were said to be 6th magnitude. This is the ancient origin of the system we still use in modern a ...
File
... and rebounds outward, like someone jumping on a trampoline. The rebounding core collides with the inward-falling surrounding layers and propels them outward, greatly assisted by the plentiful neutrinos (only a very tiny fraction of which actually interact with the gas). The star explodes, achieving ...
... and rebounds outward, like someone jumping on a trampoline. The rebounding core collides with the inward-falling surrounding layers and propels them outward, greatly assisted by the plentiful neutrinos (only a very tiny fraction of which actually interact with the gas). The star explodes, achieving ...
lect3 — 1 Measuring stars: What can be measured?
... Hence by measuring the apparent magnitude m, and somehow knowing the absolute magnitude M (i.e. the true luminosity), one can infer the distance D (in pc). H-R diagram distance: We discussed the H-R diagram last time as a relation between temperature and luminosity. In observational terms, it is act ...
... Hence by measuring the apparent magnitude m, and somehow knowing the absolute magnitude M (i.e. the true luminosity), one can infer the distance D (in pc). H-R diagram distance: We discussed the H-R diagram last time as a relation between temperature and luminosity. In observational terms, it is act ...
Lecture19
... The Crab nebula is ~2 kpc away, with an angular size of 4x2 arcminutes. The expansion velocity is measured from the Doppler shift to be 1450 km/s. Estimate the age of the nebula. How bright would the supernova that gave rise to the Crab nebula have been? ...
... The Crab nebula is ~2 kpc away, with an angular size of 4x2 arcminutes. The expansion velocity is measured from the Doppler shift to be 1450 km/s. Estimate the age of the nebula. How bright would the supernova that gave rise to the Crab nebula have been? ...
Can you write numbers in scientific notation
... Can you define the wave properties of light (wavelength, frequency, speed of light)? Do you understand how light can be described as a particle (photon)? Can you make the following calculations if you are given the equations? - energy of an individual photon - luminosity of a star - the wavelength o ...
... Can you define the wave properties of light (wavelength, frequency, speed of light)? Do you understand how light can be described as a particle (photon)? Can you make the following calculations if you are given the equations? - energy of an individual photon - luminosity of a star - the wavelength o ...
14 The Interstellar Medium and Star Formation
... Dust grains are known to be elongated, rather than spherical, because they polarize light passing through them. They also may be slightly conductive because they polarize and rotate radio waves. ...
... Dust grains are known to be elongated, rather than spherical, because they polarize light passing through them. They also may be slightly conductive because they polarize and rotate radio waves. ...
Stellar Evolution
... of radio energy that acts like a spinning search-light. That appear to us as a Pulsar, a source of a rhythmic radio signal first thought to be intelligent aliens! ...
... of radio energy that acts like a spinning search-light. That appear to us as a Pulsar, a source of a rhythmic radio signal first thought to be intelligent aliens! ...
Constellation ARA
... planet 12152 Aratus are Hades, and Poseidon. When the named in his honour youngest child, Zeus, was born, his mother Rhea hid him in Crete and gave Cronus a stone to swallow, telling him the stone was Zeus. When Zeus grew up, he made Cronus vomit his brothers and sisters. Once freed, they banded tog ...
... planet 12152 Aratus are Hades, and Poseidon. When the named in his honour youngest child, Zeus, was born, his mother Rhea hid him in Crete and gave Cronus a stone to swallow, telling him the stone was Zeus. When Zeus grew up, he made Cronus vomit his brothers and sisters. Once freed, they banded tog ...
10.1 The Solar Neighborhood Barnard`s Star
... 10.5 The Hertzsprung-Russell Diagram An H-R diagram of the 100 brightest stars looks quite different: These stars are all more luminous than the Sun. Two new categories appear here – the red giants and the blue giants. Clearly, the brightest stars in the sky appear bright because of their enormous ...
... 10.5 The Hertzsprung-Russell Diagram An H-R diagram of the 100 brightest stars looks quite different: These stars are all more luminous than the Sun. Two new categories appear here – the red giants and the blue giants. Clearly, the brightest stars in the sky appear bright because of their enormous ...
Chapter 19 Star Formation
... 19.3 Stars of Other Masses Some fragments are too small for fusion ever to begin. They gradually cool off and simply fade, radiating away whatever heat generated in trying (unsuccessfully) to ignite nuclear fusion. A protostar must have 0.08 the mass of the Sun (which is 80 times the mass of Jupite ...
... 19.3 Stars of Other Masses Some fragments are too small for fusion ever to begin. They gradually cool off and simply fade, radiating away whatever heat generated in trying (unsuccessfully) to ignite nuclear fusion. A protostar must have 0.08 the mass of the Sun (which is 80 times the mass of Jupite ...
Star Types
... and quite bright. Ex. Betelgeuse is 100,000 times more luminous than the Sun but is only 3,500K on the surface. It’s radius is 1,000 times that of the Sun. ...
... and quite bright. Ex. Betelgeuse is 100,000 times more luminous than the Sun but is only 3,500K on the surface. It’s radius is 1,000 times that of the Sun. ...
Chapter 19 Star Formation
... 19.3 Stars of Other Masses Some fragments are too small for fusion ever to begin. They gradually cool off and simply fade, radiating away whatever heat generated in trying (unsuccessfully) to ignite nuclear fusion. A protostar must have 0.08 the mass of the Sun (which is 80 times the mass of Jupite ...
... 19.3 Stars of Other Masses Some fragments are too small for fusion ever to begin. They gradually cool off and simply fade, radiating away whatever heat generated in trying (unsuccessfully) to ignite nuclear fusion. A protostar must have 0.08 the mass of the Sun (which is 80 times the mass of Jupite ...
Part II: Ideas in Conflict.
... galaxy was nearly 220 Mpc from us – farther from us that any previously observed galaxy. For this radio source to produce a radio signal large enough to be detected by a back-yard radio telescope, and to be that far away it must be emitting a HUGE amount of energy – hundreds of times the output of ...
... galaxy was nearly 220 Mpc from us – farther from us that any previously observed galaxy. For this radio source to produce a radio signal large enough to be detected by a back-yard radio telescope, and to be that far away it must be emitting a HUGE amount of energy – hundreds of times the output of ...
Lecture 10: The Milky Way
... From lecture 5 this is a mass of about 6M, and from lecture 6 this gives a MS lifetime of ~100Myr. ...
... From lecture 5 this is a mass of about 6M, and from lecture 6 this gives a MS lifetime of ~100Myr. ...
Relativistic jets in microquasars, AGN and GRBs
... • A LARGE FRACTION OF ULXs IN NEARBY GALAXIES • GRBs OF LONG DURATION IN DISTANT GALAXIES BLACK HOLE ASTROPHYSICS IS TODAY IN AN ANALOGOUS SITUATION AS WAS STELLAR ASTRONOMY IN THE FIRST HALF OF LAST CENTURY, WHEN THE HR DIAGRAM WAS ...
... • A LARGE FRACTION OF ULXs IN NEARBY GALAXIES • GRBs OF LONG DURATION IN DISTANT GALAXIES BLACK HOLE ASTROPHYSICS IS TODAY IN AN ANALOGOUS SITUATION AS WAS STELLAR ASTRONOMY IN THE FIRST HALF OF LAST CENTURY, WHEN THE HR DIAGRAM WAS ...
L = σAT 4
... order OBAFGKM. This is the same as a scale of decreasing temperature. Once again the scale is not a ...
... order OBAFGKM. This is the same as a scale of decreasing temperature. Once again the scale is not a ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.