Supernovae Oct 19 − Supernova 1987A
... Sirius A, a main-sequence star Sirius B, an earth-sized white dwarf ...
... Sirius A, a main-sequence star Sirius B, an earth-sized white dwarf ...
cifutielu`s Astronomy Test 2014
... 1. _____ Unstable supergiants that have a temperature between 10,000 and 25,000 degrees Kelvin and a luminosity 250,000 to 1,000,000 times that of the Sun’s. 2. _____ Pre-main sequence stars that are very young (less than a million years old) and have a mass that is between a fifth and a third of th ...
... 1. _____ Unstable supergiants that have a temperature between 10,000 and 25,000 degrees Kelvin and a luminosity 250,000 to 1,000,000 times that of the Sun’s. 2. _____ Pre-main sequence stars that are very young (less than a million years old) and have a mass that is between a fifth and a third of th ...
E N 1”=140 AU
... ②HST/WFPC2 Observations （Fig 3; Krist et al. 1997, 1999, Coffey et al. 2004） ⇒A bubble of emission nebulosity was detected to north (P.A. ~20 deg) of the binary system. Its structure is the following: ・The bubble extending with time ・[S II], Hα, and [O I] emission lines ・The bubble = Shock created b ...
... ②HST/WFPC2 Observations （Fig 3; Krist et al. 1997, 1999, Coffey et al. 2004） ⇒A bubble of emission nebulosity was detected to north (P.A. ~20 deg) of the binary system. Its structure is the following: ・The bubble extending with time ・[S II], Hα, and [O I] emission lines ・The bubble = Shock created b ...
The Birth, Life, and Death of Stars
... Born in Ulm, Germany in 1879 and died in Princeton in 1955 Questions the basic tenets of Quantum Mechanics: God does not play dice with the Universe ... Yet, is awarded the 1921 Nobel Prize in Physics: ... for his discovery of the law of the photoelectric effect 1905 Einstein’s Miracle Year while wo ...
... Born in Ulm, Germany in 1879 and died in Princeton in 1955 Questions the basic tenets of Quantum Mechanics: God does not play dice with the Universe ... Yet, is awarded the 1921 Nobel Prize in Physics: ... for his discovery of the law of the photoelectric effect 1905 Einstein’s Miracle Year while wo ...
Fulltext PDF
... The process of formation of a star can be divided into three phases. The first, known as 'star formation', involves massive interstellar clouds or cloud fragments, which have cooled to the point where they are detectable in molecular lines (such as CO) but which are unable to collapse because of an ...
... The process of formation of a star can be divided into three phases. The first, known as 'star formation', involves massive interstellar clouds or cloud fragments, which have cooled to the point where they are detectable in molecular lines (such as CO) but which are unable to collapse because of an ...
Life in the Universe
... light strikes the center of the spiral on the first day of summer (about 1000AD) ...
... light strikes the center of the spiral on the first day of summer (about 1000AD) ...
Week 11 Concept Summary
... (c) Halo: The halo contains only older stars, almost all inside the globular clusters also found there. There is no gas and dust, and what stars are there have very low concentrations of heavy elements. They also orbit randomly in the gallaxy. 2. Interstellar Medium: This is the gas and dust that fl ...
... (c) Halo: The halo contains only older stars, almost all inside the globular clusters also found there. There is no gas and dust, and what stars are there have very low concentrations of heavy elements. They also orbit randomly in the gallaxy. 2. Interstellar Medium: This is the gas and dust that fl ...
Stellar Luminosities
... • When we learn how to get distances beyond the limits of parallax and sample many more stars, we will find there are stars that are stars that are 106 times the luminosity of the Sun. • This is an enormous range in energy output from stars. This is an important clue in figuring out how they produce ...
... • When we learn how to get distances beyond the limits of parallax and sample many more stars, we will find there are stars that are stars that are 106 times the luminosity of the Sun. • This is an enormous range in energy output from stars. This is an important clue in figuring out how they produce ...
objects in telescope are farther than they appear
... be detected, such sky conditions and the sensitivity of the human eye.10 This detection limit means that the apparent star diameters Galileo sees will be smaller than twice the Airy Disk radius (Figure 2). What's more, dimmer stars will appear to have smaller diameters than brighter stars (Figure 3) ...
... be detected, such sky conditions and the sensitivity of the human eye.10 This detection limit means that the apparent star diameters Galileo sees will be smaller than twice the Airy Disk radius (Figure 2). What's more, dimmer stars will appear to have smaller diameters than brighter stars (Figure 3) ...
Slide 1
... Very small zone near the star solar system. Planets within this zone would be tidally locked with the star; a thick circulating atmosphere might be required to avoid the freeze-out of the atmosphere on the night side. This might be somewhat challenging to develop with a rotation period of 70 days (a ...
... Very small zone near the star solar system. Planets within this zone would be tidally locked with the star; a thick circulating atmosphere might be required to avoid the freeze-out of the atmosphere on the night side. This might be somewhat challenging to develop with a rotation period of 70 days (a ...
Astronomy Assignment #1
... question is 9 times the radius of the Sun. A note is worthy here: We expected this star to be larger because it was the same temperature as the Sun, by quite a bit more luminous. What this problem is trying to illustrate, is the luminosity depends on the square of the stellar radius, not just on the ...
... question is 9 times the radius of the Sun. A note is worthy here: We expected this star to be larger because it was the same temperature as the Sun, by quite a bit more luminous. What this problem is trying to illustrate, is the luminosity depends on the square of the stellar radius, not just on the ...
12.748 Lecture 2 Cosmic Abundances, Nucleosynthesis and
... barrier between deuterium nuclei (deuterium is the heavier isotope of hydrogen, whose nucleus consists of one proton and one neutron), and it begins a brief flirtation with nuclear fusion. Temperatures have reached somewhere between 0.5 and 5 million degrees. In addition to deuterium, other light el ...
... barrier between deuterium nuclei (deuterium is the heavier isotope of hydrogen, whose nucleus consists of one proton and one neutron), and it begins a brief flirtation with nuclear fusion. Temperatures have reached somewhere between 0.5 and 5 million degrees. In addition to deuterium, other light el ...
An Earth-sized Planet in the Habitable Zone of a
... out, the planet was likely vulnerable to photo-evaporation early in the star’s life when extreme ultra-violet (XUV) flux from the star was significantly higher. Hence any H/He envelope that was accreted would likely have been stripped via hydrodynamic mass loss (23). Although Kepler-186f likely does ...
... out, the planet was likely vulnerable to photo-evaporation early in the star’s life when extreme ultra-violet (XUV) flux from the star was significantly higher. Hence any H/He envelope that was accreted would likely have been stripped via hydrodynamic mass loss (23). Although Kepler-186f likely does ...
Type Ia supernovae and the ESSENCE supernova survey
... stars in the sky are said to be “of the first magnitude”. The faintest stars visible to the unaided eye are 6th magnitude. For two stars of intensity I1 and I2 their apparent magnitudes are related as follows: m2 – m1 = log (I2/I1) Thus, if we receive 100 times as many photons per second from ...
... stars in the sky are said to be “of the first magnitude”. The faintest stars visible to the unaided eye are 6th magnitude. For two stars of intensity I1 and I2 their apparent magnitudes are related as follows: m2 – m1 = log (I2/I1) Thus, if we receive 100 times as many photons per second from ...
Surveys of Stars, The interstellar medium
... Parallax Distance Distance + apparent brightness Luminosity ( L=4D2 f) Spectral type (or color) Temperature Luminosity + temperature Radius (L=4R2 T4) Luminosity and temperature are the two independent intrinsic parameters of stars. ...
... Parallax Distance Distance + apparent brightness Luminosity ( L=4D2 f) Spectral type (or color) Temperature Luminosity + temperature Radius (L=4R2 T4) Luminosity and temperature are the two independent intrinsic parameters of stars. ...
Magnitudes and Colours of Stars - Lincoln
... Let’s leave brightness for now, and start thinking about stellar size: another important property for classifying stars. It is almost impossible to actually see a star through a telescope and measure its physical diameter. We can do this with objects within the Solar System, but the stars are simply ...
... Let’s leave brightness for now, and start thinking about stellar size: another important property for classifying stars. It is almost impossible to actually see a star through a telescope and measure its physical diameter. We can do this with objects within the Solar System, but the stars are simply ...
The First Stars - Amazon Web Services
... stars. These tracers are the ratios of certain elements to a standard tracer such as iron. Iron is a useful age indicator since it is the ultimate endpoint of thermonuclear combustion and ejected in supernovae throughout the history of the universe. If we find an iron-poor environment, we can be sur ...
... stars. These tracers are the ratios of certain elements to a standard tracer such as iron. Iron is a useful age indicator since it is the ultimate endpoint of thermonuclear combustion and ejected in supernovae throughout the history of the universe. If we find an iron-poor environment, we can be sur ...
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.