Polaris
... yellow Cepheid variable (α UMi A), orbited by a bright yellow dwarf (α UMi B) at a distance of about 2400 AU (360 billion kilometers, or 224 billion miles). Polaris B can be seen with even a modest telescope and was first noticed by William Herschel in 1780. In 1929, it was discovered by examining t ...
... yellow Cepheid variable (α UMi A), orbited by a bright yellow dwarf (α UMi B) at a distance of about 2400 AU (360 billion kilometers, or 224 billion miles). Polaris B can be seen with even a modest telescope and was first noticed by William Herschel in 1780. In 1929, it was discovered by examining t ...
Surveys of Stars, The interstellar medium
... The Coronal Gas Additional component of very hot, low-density gas in the ISM: T ~ 1 million K n ~ 0.001 particles/cm3 ...
... The Coronal Gas Additional component of very hot, low-density gas in the ISM: T ~ 1 million K n ~ 0.001 particles/cm3 ...
Student Exploration Sheet: Growing Plants
... Late in the life of a normal star, the core of the star collapses and grows hotter. This causes the outer layers of the star to expand outward, forming a giant star. Nebula – a cloud of gas and dust in interstellar space. ...
... Late in the life of a normal star, the core of the star collapses and grows hotter. This causes the outer layers of the star to expand outward, forming a giant star. Nebula – a cloud of gas and dust in interstellar space. ...
Unit 3: Understanding the Universe
... Enduring Understandings The solar system contains planets, dwarf planets, comets, asteroids, and other small solar system bodies. ...
... Enduring Understandings The solar system contains planets, dwarf planets, comets, asteroids, and other small solar system bodies. ...
Biology: Unit One Calendar
... Section 30.1 Characteristics of Stars Describe how astronomers determine the composition and temperature of stars (2d) Explain why stars appear to move in the sky. (1d) Describe one way astronomers measure distance to stars. (1d) Explain the difference between absolute magnitude and apparent ...
... Section 30.1 Characteristics of Stars Describe how astronomers determine the composition and temperature of stars (2d) Explain why stars appear to move in the sky. (1d) Describe one way astronomers measure distance to stars. (1d) Explain the difference between absolute magnitude and apparent ...
star-formation rate
... • The theory of population synthesis aims at interpreting the spectrum of galaxies as a superposition of stellar spectra. • Change of the stellar distribution over time e.g., massive stars leave the main sequence after several 106 years, the number of luminous blue stars thus decreases, so the spect ...
... • The theory of population synthesis aims at interpreting the spectrum of galaxies as a superposition of stellar spectra. • Change of the stellar distribution over time e.g., massive stars leave the main sequence after several 106 years, the number of luminous blue stars thus decreases, so the spect ...
The Milky Way Galaxy
... Dark matter must be about 90% of the mass! Composition unknown. Probably mostly exotic particles that don't interact with ordinary matter at all (except gravity). Some may be brown dwarfs, dead white dwarfs … Most likely it's a dark halo surrounding the Milky Way. ...
... Dark matter must be about 90% of the mass! Composition unknown. Probably mostly exotic particles that don't interact with ordinary matter at all (except gravity). Some may be brown dwarfs, dead white dwarfs … Most likely it's a dark halo surrounding the Milky Way. ...
Great Basin - 2016 NSS Convention
... As it is visible as a faint smudge on a moonless night, and is one of the farthest objects visible to the naked eye. The Andromeda Galaxy is approaching the Sun at about 62 to 87 miles per second, so Andromeda and the Milky Way are expected to collide in perhaps 2.5 billion years. ...
... As it is visible as a faint smudge on a moonless night, and is one of the farthest objects visible to the naked eye. The Andromeda Galaxy is approaching the Sun at about 62 to 87 miles per second, so Andromeda and the Milky Way are expected to collide in perhaps 2.5 billion years. ...
CP2: KUPKA et al.: Observational signatures of atmospheric velocity
... strong lines seems too large for the weak lines. (Numerous weak lines not modeled are from the secondary star.) A fit to the spectrum of the A3 V star HD 103578. The star is an SB2 system. The spectrum has been corrected by subtracting 9% of the light to remove the secondary contribution. The model ...
... strong lines seems too large for the weak lines. (Numerous weak lines not modeled are from the secondary star.) A fit to the spectrum of the A3 V star HD 103578. The star is an SB2 system. The spectrum has been corrected by subtracting 9% of the light to remove the secondary contribution. The model ...
The Doppler Effect - RanelaghALevelPhysics
... • Now, it turns out that if the material absorbing light is moving towards or away from us with some radial velocity, we see shifts in the location of the absorption lines: • material moves towards us: shift to shorter wavelengths (blue) • material moves away from us: shift to longer wavelengths (re ...
... • Now, it turns out that if the material absorbing light is moving towards or away from us with some radial velocity, we see shifts in the location of the absorption lines: • material moves towards us: shift to shorter wavelengths (blue) • material moves away from us: shift to longer wavelengths (re ...
MSci Astrophysics 210PHY412 - Queen's University Belfast
... high density observed within the observed shells in stellar ejecta, and relative paucity of very bright stars on the AGB. The latter (Prialnik P. 161) comes from the number of AGB stars expected compared to observed is >10. Hence a process prevents them completing their movement up the AGB, while lo ...
... high density observed within the observed shells in stellar ejecta, and relative paucity of very bright stars on the AGB. The latter (Prialnik P. 161) comes from the number of AGB stars expected compared to observed is >10. Hence a process prevents them completing their movement up the AGB, while lo ...
L10 - QUB Astrophysics Research Centre
... high density observed within the observed shells in stellar ejecta, and relative paucity of very bright stars on the AGB. The latter (Prialnik P. 161) comes from the number of AGB stars expected compared to observed is >10. Hence a process prevents them completing their movement up the AGB, while lo ...
... high density observed within the observed shells in stellar ejecta, and relative paucity of very bright stars on the AGB. The latter (Prialnik P. 161) comes from the number of AGB stars expected compared to observed is >10. Hence a process prevents them completing their movement up the AGB, while lo ...
Core-collapse supernovae and their massive progenitors
... H-rich envelopes, for which single-star evolutionary models suggest initial masses of up to about 20 M⊙. Observationally, RSG progenitors for a number of Type II-P SNe are confirmed from pre-explosion images (e.g. figure 2). Type IIL and IIb supernovae are less common, with a relatively low-mass hyd ...
... H-rich envelopes, for which single-star evolutionary models suggest initial masses of up to about 20 M⊙. Observationally, RSG progenitors for a number of Type II-P SNe are confirmed from pre-explosion images (e.g. figure 2). Type IIL and IIb supernovae are less common, with a relatively low-mass hyd ...
Your Place in Space and Time
... ...we learned that Earth is a planet orbiting the Sun only 1 second ago ... ...
... ...we learned that Earth is a planet orbiting the Sun only 1 second ago ... ...
Astro history notes 1
... • Why are we here (not clear on that one either…?) • Where are we? • Humans have been working on that one for a long time! ...
... • Why are we here (not clear on that one either…?) • Where are we? • Humans have been working on that one for a long time! ...
Week8Lecture1
... The galactic halo and globular clusters formed very early; the halo is essentially spherical. All the stars in the halo are very old, and there is no gas and dust. The galactic disk is where the youngest stars are, as well as star formation regions – emission nebulae, large clouds of gas and dust. S ...
... The galactic halo and globular clusters formed very early; the halo is essentially spherical. All the stars in the halo are very old, and there is no gas and dust. The galactic disk is where the youngest stars are, as well as star formation regions – emission nebulae, large clouds of gas and dust. S ...
Why Aren`t All Galaxies Barred?
... the mass of the bulge to be much greater than one would guess from its luminosity. As we increase the mass of the bulge component in the computer models, we reduce the growth rate of the bar. Eventually, when the bulge is roughly twice as massive as the entire disk, we find that the bar instability ...
... the mass of the bulge to be much greater than one would guess from its luminosity. As we increase the mass of the bulge component in the computer models, we reduce the growth rate of the bar. Eventually, when the bulge is roughly twice as massive as the entire disk, we find that the bar instability ...
Astronomy Notes - Science with Ms. Peralez
... size from <1 meter to several hundred km Comet- made of gas, dust and ice and moves around the Sun in an oval-shaped orbit Meteoroids- debris left by colliding asteroids or dispersing comets ...
... size from <1 meter to several hundred km Comet- made of gas, dust and ice and moves around the Sun in an oval-shaped orbit Meteoroids- debris left by colliding asteroids or dispersing comets ...
Multiple Choice, continued Stars, Galaxies, and the Universe
... Today, we know that Copernicus was right: the stars are very far from Earth. In fact, stars are so distant that a new unit of length—the light-year—was created to measure their distance. A light-year is a unit of length equal to the distance that light travels through space in 1 year. Because the sp ...
... Today, we know that Copernicus was right: the stars are very far from Earth. In fact, stars are so distant that a new unit of length—the light-year—was created to measure their distance. A light-year is a unit of length equal to the distance that light travels through space in 1 year. Because the sp ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.