Observational properties of stars
... spectrum, “B” corresponds to blue light, “V” is green, “R” is red and “I” is infrared. There are actually hundreds of different types of filters, some are telescope specific, or are used only by particular observatories. However, the filters given here are the most commonly used in stellar astronomy ...
... spectrum, “B” corresponds to blue light, “V” is green, “R” is red and “I” is infrared. There are actually hundreds of different types of filters, some are telescope specific, or are used only by particular observatories. However, the filters given here are the most commonly used in stellar astronomy ...
Lecture12
... A certain star has 100 times the luminosity of the Sun and a surface temperature of 3500 K. What type of star is it? A. A high-mass main-sequence star B. A low-mass main-sequence star C. A red giant D. A red dwarf E. A white dwarf ...
... A certain star has 100 times the luminosity of the Sun and a surface temperature of 3500 K. What type of star is it? A. A high-mass main-sequence star B. A low-mass main-sequence star C. A red giant D. A red dwarf E. A white dwarf ...
ASTR1102-002 Potentially useful facts and mathematical relations
... If the star “Alpha Centauri A” (see Table 1) were moved twice as far away from us, how much brighter/fainter would it become as viewed on the night sky? a. “Alpha Centauri A” would become half as bright. b. “Alpha Centauri A” would become one-fourth as bright. c. “Alpha Centauri A” would become twic ...
... If the star “Alpha Centauri A” (see Table 1) were moved twice as far away from us, how much brighter/fainter would it become as viewed on the night sky? a. “Alpha Centauri A” would become half as bright. b. “Alpha Centauri A” would become one-fourth as bright. c. “Alpha Centauri A” would become twic ...
Life Cycle of a Star Vocabulary
... • Gravity presses the material in on itself so tightly that protons and electrons combine to make neutrons, yielding the name "neutron star”. ...
... • Gravity presses the material in on itself so tightly that protons and electrons combine to make neutrons, yielding the name "neutron star”. ...
X-ray output should be time variable
... Bright stars in the spectral range earlier than about B3 are soft X-ray sources, with LX ~ 10-7 LBol THEORY •O star X-ray emission comes from shock-heated gas present in their stellar winds; for B stars, the situation is more uncertain, and their Xrays may be related to magnetic fields, at least in ...
... Bright stars in the spectral range earlier than about B3 are soft X-ray sources, with LX ~ 10-7 LBol THEORY •O star X-ray emission comes from shock-heated gas present in their stellar winds; for B stars, the situation is more uncertain, and their Xrays may be related to magnetic fields, at least in ...
MS Word version
... Question 4: The two end stars of the Big Dipper are known as the “pointer stars” since a line drawn through them points toward Polaris (a very important marker in the sky since it is located very near the NCP). Use the constellations control to add the Big Dipper to the celestial sphere. Now manipul ...
... Question 4: The two end stars of the Big Dipper are known as the “pointer stars” since a line drawn through them points toward Polaris (a very important marker in the sky since it is located very near the NCP). Use the constellations control to add the Big Dipper to the celestial sphere. Now manipul ...
ISP205L, Week 13 Computer Lab Activity The Distance to the Pleiades
... where m = the apparent magnitude, M = the absolute magnitude, and d = the distance in parsecs. At long last, equation (8) is the one that we need for this lab exercise. 4. Back to the Pleiades For the lab exercise we are going to give you an H-R diagram that plots the absolute magnitudes (M) of stan ...
... where m = the apparent magnitude, M = the absolute magnitude, and d = the distance in parsecs. At long last, equation (8) is the one that we need for this lab exercise. 4. Back to the Pleiades For the lab exercise we are going to give you an H-R diagram that plots the absolute magnitudes (M) of stan ...
Oscillating White Dwarf Stars Background on White Dwarfs
... temperatures of 100.000.000 K. 8Be is unstable and decays back into He in 2.6 × 10–16 secs, but in the stellar interior a small equilibrium of 8Be exists. The 8Be ground state has almost exactly the energy of two alpha particles. In the second step, 8Be + 4He has almost exactly the energy of an exci ...
... temperatures of 100.000.000 K. 8Be is unstable and decays back into He in 2.6 × 10–16 secs, but in the stellar interior a small equilibrium of 8Be exists. The 8Be ground state has almost exactly the energy of two alpha particles. In the second step, 8Be + 4He has almost exactly the energy of an exci ...
Constellations Overview
... Ursa Minor (the little bear) • Ursa Minor, also called the Little Dipper, is a circumpolar constellation. • There are several mythological stories behind these famous constellations. In Greek myth, Zeus was having an affair with the lovely Callisto. When his wife, Hera, found out she changed Callis ...
... Ursa Minor (the little bear) • Ursa Minor, also called the Little Dipper, is a circumpolar constellation. • There are several mythological stories behind these famous constellations. In Greek myth, Zeus was having an affair with the lovely Callisto. When his wife, Hera, found out she changed Callis ...
AST4930 Star and Planet Formation
... enough that these objects are already on the main sequence as soon as the stellar system is non embedded. ...
... enough that these objects are already on the main sequence as soon as the stellar system is non embedded. ...
MS Word version
... Question 5: The two end stars of the Big Dipper are known as the “pointer stars” since a line drawn through them points toward Polaris (a very important marker in the sky since it is located very near the NCP). Use the constellations control to add the Big Dipper to the celestial sphere. Now manipul ...
... Question 5: The two end stars of the Big Dipper are known as the “pointer stars” since a line drawn through them points toward Polaris (a very important marker in the sky since it is located very near the NCP). Use the constellations control to add the Big Dipper to the celestial sphere. Now manipul ...
Here
... • Using a good high resolution spectrum, you can get a much better measurement of the spectral energy distribution. • The disadvantage is that the efficiency is lower (more photons are lost in the complex optics). Also, it is difficult to measure more than one star at a time (in contrast to the dire ...
... • Using a good high resolution spectrum, you can get a much better measurement of the spectral energy distribution. • The disadvantage is that the efficiency is lower (more photons are lost in the complex optics). Also, it is difficult to measure more than one star at a time (in contrast to the dire ...
uniview glossary - DMNS Galaxy Guide Portal
... Saturn was named for the Roman god of agriculture and lies 885 million miles from the Sun, (9.6 AU). Saturn takes 29.5 years to orbit, but only 10.7 hours to rotate (day). Its diameter is 75,000 miles, making it the second largest planet. Its mass is 95 times that of Earth. It is the second of the f ...
... Saturn was named for the Roman god of agriculture and lies 885 million miles from the Sun, (9.6 AU). Saturn takes 29.5 years to orbit, but only 10.7 hours to rotate (day). Its diameter is 75,000 miles, making it the second largest planet. Its mass is 95 times that of Earth. It is the second of the f ...
Chapter 2 Surveying the stars 2.1 Star magnitudes
... The brightness of a star in the night sky depends on the intensity of the star’s light at the Earth which is the light energy per second per unit surface area received from the star at normal incidence on a surface. The intensity of sunlight at the Earth’s surface is about 1400 W m−2. In comparison, ...
... The brightness of a star in the night sky depends on the intensity of the star’s light at the Earth which is the light energy per second per unit surface area received from the star at normal incidence on a surface. The intensity of sunlight at the Earth’s surface is about 1400 W m−2. In comparison, ...
Set 2: Nature of Galaxies
... • Non-constancy of the Ωlp will still cause winding but of the pattern and typically at a slower rate for (1, 2). • Where the local pattern speed matches the global pattern speed Lindblad resonances occur where the epicyclic amplitude increases due to forcing from the local density enhancement - can ...
... • Non-constancy of the Ωlp will still cause winding but of the pattern and typically at a slower rate for (1, 2). • Where the local pattern speed matches the global pattern speed Lindblad resonances occur where the epicyclic amplitude increases due to forcing from the local density enhancement - can ...
Preview Sample 2
... The names of stars usually come from ancient Arabic, although modern astronomers often refer to a star by its constellation and a Greek letter assigned according to its brightness within the constellation. How can you compare the brightness of the stars? The magnitude system is the astronomer’s brig ...
... The names of stars usually come from ancient Arabic, although modern astronomers often refer to a star by its constellation and a Greek letter assigned according to its brightness within the constellation. How can you compare the brightness of the stars? The magnitude system is the astronomer’s brig ...
Spectral Classification: The First Step in Quantitative Spectral Analysis
... Fall back on secondary luminosity criteria – lines of Fe II and Ti II “V” type is valid, so iteration is not necessary ...
... Fall back on secondary luminosity criteria – lines of Fe II and Ti II “V” type is valid, so iteration is not necessary ...
astro2_lec1 - Astronomy & Astrophysics Group
... For many years the prevailing belief was that ellipticals evolve into spirals, from left to right in the tuning fork (although Hubble did not argue for the tuning fork diagram as an evolutionary sequence). ...
... For many years the prevailing belief was that ellipticals evolve into spirals, from left to right in the tuning fork (although Hubble did not argue for the tuning fork diagram as an evolutionary sequence). ...
Lecture7
... before degeneracy stops further gravitational contraction before they go all the way to creation of an iron core and catastrophic explosion. So most of them probably will go through the planetary nebula stage and eventually end up as white dwarfs. However, before the degeneracy sets in finally in th ...
... before degeneracy stops further gravitational contraction before they go all the way to creation of an iron core and catastrophic explosion. So most of them probably will go through the planetary nebula stage and eventually end up as white dwarfs. However, before the degeneracy sets in finally in th ...
Boötes
Boötes /boʊˈoʊtiːz/ is a constellation in the northern sky, located between 0° and +60° declination, and 13 and 16 hours of right ascension on the celestial sphere. The name comes from the Greek Βοώτης, Boōtēs, meaning herdsman or plowman (literally, ox-driver; from βοῦς bous “cow”). The ""ö"" in the name is a diaeresis, not an umlaut, meaning that each 'o' is to be pronounced separately.One of the 48 constellations described by the 2nd century astronomer Ptolemy, Boötes is now one of the 88 modern constellations. It contains the fourth brightest star in the night sky, the orange-hued Arcturus. Boötes is home to many other bright stars, including eight above the fourth magnitude and an additional 21 above the fifth magnitude, making a total of 29 stars easily visible to the naked eye.