Picture: Alnitak is the left-hand star in Orion`s Belt. Image: NASA
... carbon/oxygen ratios that are typically four to five times higher than those of normal red giants and show little trace of the light metal oxide bands that are the usual red giant hallmark. They resemble S stars in their relative proportion of heavy and light metals, but contain far more carbon in t ...
... carbon/oxygen ratios that are typically four to five times higher than those of normal red giants and show little trace of the light metal oxide bands that are the usual red giant hallmark. They resemble S stars in their relative proportion of heavy and light metals, but contain far more carbon in t ...
A bowshock model for the wind-ISM interaction of the run
... We will need to look a little closer to what combinations of the four parameters proper motion (two components), distance and ρism lead to ’nice agreements’ between model and observations. We will also look at what happens inside the bowshock. If an outburst occurs, it will interact with the shock a ...
... We will need to look a little closer to what combinations of the four parameters proper motion (two components), distance and ρism lead to ’nice agreements’ between model and observations. We will also look at what happens inside the bowshock. If an outburst occurs, it will interact with the shock a ...
White Dwarfs
... Quiz Questions 2. Why can't the lowest-mass stars become giants? a. They never get hot enough for the triple-alpha process. b. Their gravity is too weak to stop them from expanding beyond the giant phase. c. They live so long that none has ever left the main sequence. d. The rate of hydrogen-shell ...
... Quiz Questions 2. Why can't the lowest-mass stars become giants? a. They never get hot enough for the triple-alpha process. b. Their gravity is too weak to stop them from expanding beyond the giant phase. c. They live so long that none has ever left the main sequence. d. The rate of hydrogen-shell ...
Milky Way
... • Cepheids are evolved supergiant stars that brighten and fade periodically as their size oscillates. Remember, these are standard candles. • If Cepheids appear faint, then they must be way outside the Milky Way Galaxy. • From the distance and angular size of spiral nebulae, Hubble deduced that they ...
... • Cepheids are evolved supergiant stars that brighten and fade periodically as their size oscillates. Remember, these are standard candles. • If Cepheids appear faint, then they must be way outside the Milky Way Galaxy. • From the distance and angular size of spiral nebulae, Hubble deduced that they ...
ASTR3007/4007/6007, Tutorial 4: Deuterium Burning in Protostars
... When stars first form out of interstellar gas, they have radii substantially larger than main sequence stars of the same mass. As a result, their centres are too cool to drive nuclear reactions, and they are not in energy equilibrium. They therefore contract over a KelvinHelmholtz timescale. As they ...
... When stars first form out of interstellar gas, they have radii substantially larger than main sequence stars of the same mass. As a result, their centres are too cool to drive nuclear reactions, and they are not in energy equilibrium. They therefore contract over a KelvinHelmholtz timescale. As they ...
Document
... For stars like the sun, the oscillation period is 5 min → 1 min exposure time For good RV measurement you need S/N = 200 On a 2m telescope with a good spectrograph you can get S/N = 100 (10000 photons) in one hour on a V=10 star → 400.000 photons on a V=6 star in one hour, 6600 photons in one minute ...
... For stars like the sun, the oscillation period is 5 min → 1 min exposure time For good RV measurement you need S/N = 200 On a 2m telescope with a good spectrograph you can get S/N = 100 (10000 photons) in one hour on a V=10 star → 400.000 photons on a V=6 star in one hour, 6600 photons in one minute ...
28. What causes waves - Summer Science Safari
... 40. Why are spectroscopes/ spectrographs useful tools used by astronomers? Used to determine the composition of stars, distance to stars, if star is moving towards or away from an object ( red/blue shift) ...
... 40. Why are spectroscopes/ spectrographs useful tools used by astronomers? Used to determine the composition of stars, distance to stars, if star is moving towards or away from an object ( red/blue shift) ...
The Northern Winter Constellations
... will come across a very bright star called Capella. From Capella, you can follow the pentagon of brighter stars nearby that make up Auriga. Just below Capella, there is a triangle of stars known as ‘the kids’ as in goat babies. Capella was one of the most important stars for navigation as it could b ...
... will come across a very bright star called Capella. From Capella, you can follow the pentagon of brighter stars nearby that make up Auriga. Just below Capella, there is a triangle of stars known as ‘the kids’ as in goat babies. Capella was one of the most important stars for navigation as it could b ...
Nature of Stars 2
... Nearest star is 4 x 1013 km away ‣ Called Proxima Centauri Around 4.2 light years More than 5000 times the distance to Pluto Walking time: 1 billion years Fastest space probes: Voyagers 1 & 2, Pioneers 10 & 11) – 60,000 years at about 3.6 AU/year (38000 mi/hr) ...
... Nearest star is 4 x 1013 km away ‣ Called Proxima Centauri Around 4.2 light years More than 5000 times the distance to Pluto Walking time: 1 billion years Fastest space probes: Voyagers 1 & 2, Pioneers 10 & 11) – 60,000 years at about 3.6 AU/year (38000 mi/hr) ...
ASTRONOMY 0089: EXAM 1 Class Meets M,W,F, 1:00 PM Feb 12
... a. there is a cold gas between us and the light source. b. an atom undergoes a collision. c. the spectrum is that of a perfect black body. d. the energy at that wavelength is higher than at neighboring wavelengths. e. the energy at that wavelength is lower than at neighboring wavelengths. 17. The da ...
... a. there is a cold gas between us and the light source. b. an atom undergoes a collision. c. the spectrum is that of a perfect black body. d. the energy at that wavelength is higher than at neighboring wavelengths. e. the energy at that wavelength is lower than at neighboring wavelengths. 17. The da ...
Name Date Life and Death of a Star 2015 1. In the main
... B. hydrogen fusing to helium makes the core more dense C. carbon and iron are accumulating in the core In a timeline that shows the sequence of events that occurs during the formation of a star, what happens after the temperature increases in a proto-star? A. nuclear fusion begins B. gravity ceases ...
... B. hydrogen fusing to helium makes the core more dense C. carbon and iron are accumulating in the core In a timeline that shows the sequence of events that occurs during the formation of a star, what happens after the temperature increases in a proto-star? A. nuclear fusion begins B. gravity ceases ...
MSci Astrophysics 210PHY412 - Queen's University Belfast
... • Begin to understand how we will constrain stellar models with hard observational evidence ...
... • Begin to understand how we will constrain stellar models with hard observational evidence ...
star signs - Museum of the Rockies
... Because all stars appear to rotate around the North Celestial Pole, the stars between the pole and the observer’s horizon are known as “circumpolar constellations” because they never rise or set. ACTIVITY: This activity relates to coordinate systems and graphing and has a direct relationship to the ...
... Because all stars appear to rotate around the North Celestial Pole, the stars between the pole and the observer’s horizon are known as “circumpolar constellations” because they never rise or set. ACTIVITY: This activity relates to coordinate systems and graphing and has a direct relationship to the ...
Coursework 6 File
... lines shift periodically in wavelength with a period equal to 4.23 days. More specifically, a spectral line located at wavelength λ = 650 nm shifts periodically by an amount equal to ∆λ = ±2.17×10−4 nm. The sun-like star has a mass M∗ = 2×1030 kg and a radius 7×108 m. Assuming that the periodic shif ...
... lines shift periodically in wavelength with a period equal to 4.23 days. More specifically, a spectral line located at wavelength λ = 650 nm shifts periodically by an amount equal to ∆λ = ±2.17×10−4 nm. The sun-like star has a mass M∗ = 2×1030 kg and a radius 7×108 m. Assuming that the periodic shif ...
DP11 Foundations of Astronomy
... know its distance, we can determine its luminosity, from the socalled inverse square law: b = L/4 d2 ...
... know its distance, we can determine its luminosity, from the socalled inverse square law: b = L/4 d2 ...
Radio-quiet Isolated Neutron Stars
... RX J1856.5-3754 • ROSAT Detected in the RASS between 1990/09/14~1990/10/02. Identified with the 1992/10/16 PSPC data. No variability at levels greater than ~1% in 1hr, or <30% on timescale up to 15 years. ...
... RX J1856.5-3754 • ROSAT Detected in the RASS between 1990/09/14~1990/10/02. Identified with the 1992/10/16 PSPC data. No variability at levels greater than ~1% in 1hr, or <30% on timescale up to 15 years. ...
Ursa Minor
Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.