First firm spectral classification of an early-B pre-main
... for mid- to late-B stars (Gray & Corbally 2009) as the neutral helium line disappears towards lower temperature (A0) and the magnesium line strengthens. When also considering another line ratio, Si ii 412.8 nm/He i 448.1 nm, the spectral type becomes B6 (±one subtype). The spectral type and luminosi ...
... for mid- to late-B stars (Gray & Corbally 2009) as the neutral helium line disappears towards lower temperature (A0) and the magnesium line strengthens. When also considering another line ratio, Si ii 412.8 nm/He i 448.1 nm, the spectral type becomes B6 (±one subtype). The spectral type and luminosi ...
How to watch the Perseid meteor shower
... in or are close to the UK you will be in for a treat during the Perseid meteor shower in 2013 as the International Space Station is visible over UK skies. This orbital laboratory is the size of a football pitch, travels at 1,7500 mph and is around 200 miles up! It orbits the Earth every 90 minutes a ...
... in or are close to the UK you will be in for a treat during the Perseid meteor shower in 2013 as the International Space Station is visible over UK skies. This orbital laboratory is the size of a football pitch, travels at 1,7500 mph and is around 200 miles up! It orbits the Earth every 90 minutes a ...
Stellar Classification - Solar Physics and Space Weather
... B 10,000 - 30,000 K Blue-white stars A 7,500 - 10,000 K White stars F 6,000 - 7,500 K Yellow-white stars G 5,000 - 6,000 K Yellow stars (like the Sun) K 3,500 - 5,000K Yellow-orange stars M < 3,500 K Red stars ...
... B 10,000 - 30,000 K Blue-white stars A 7,500 - 10,000 K White stars F 6,000 - 7,500 K Yellow-white stars G 5,000 - 6,000 K Yellow stars (like the Sun) K 3,500 - 5,000K Yellow-orange stars M < 3,500 K Red stars ...
printer-friendly version of benchmark
... For mid-mass stars, such as our Sun, this is called the red giant stage, where helium is being fused into carbon. Scientists have gathered strong evidence that our Sun will become, in about 5 billion years, a red giant where its outer layer may spread as wide as Earth’s orbit. The temperature of our ...
... For mid-mass stars, such as our Sun, this is called the red giant stage, where helium is being fused into carbon. Scientists have gathered strong evidence that our Sun will become, in about 5 billion years, a red giant where its outer layer may spread as wide as Earth’s orbit. The temperature of our ...
Introduction
... The L−Tef f diagram itself gives no further information than L, Tef f , and R and says nothing about mass, composition, or state of evolution. But these may be inferred from from the distribution of stars in the diagram, plus the modeling. Observer’s HR (or color-magnitude) diagram: e.g., Mv vs. B − ...
... The L−Tef f diagram itself gives no further information than L, Tef f , and R and says nothing about mass, composition, or state of evolution. But these may be inferred from from the distribution of stars in the diagram, plus the modeling. Observer’s HR (or color-magnitude) diagram: e.g., Mv vs. B − ...
Planets Beyond the Solar System
... Microlensing events are not very common It is also difficult to get a repeat observation This method does not work well for planets that are very close to their stars. ...
... Microlensing events are not very common It is also difficult to get a repeat observation This method does not work well for planets that are very close to their stars. ...
Gravity Defied From Potato Asteroids to Magnetised Neutron Stars
... From Potato Asteroids to Magnetised Neutron Stars; 1: The Self-Gravitating Objects, Resonance, Vol.22, No.3, pp.225– ...
... From Potato Asteroids to Magnetised Neutron Stars; 1: The Self-Gravitating Objects, Resonance, Vol.22, No.3, pp.225– ...
Universe 8/e Chapter 2 - Physics and Astronomy
... locate objects in the sky 2-5 What causes the seasons 2-6 The effect of changes in the direction of Earth’s axis of rotation 2-7 The role of astronomy in measuring time 2-8 How the modern calendar developed ...
... locate objects in the sky 2-5 What causes the seasons 2-6 The effect of changes in the direction of Earth’s axis of rotation 2-7 The role of astronomy in measuring time 2-8 How the modern calendar developed ...
Stellar Evolution
... • Think back to the first carbon core. • How they get from main sequence to the carbon core stage is a little different. • Now however, there is enough mass that it becomes hot enough to ...
... • Think back to the first carbon core. • How they get from main sequence to the carbon core stage is a little different. • Now however, there is enough mass that it becomes hot enough to ...
Lecture 3 - Empyrean Quest Publishers
... Angular separation (distance)--no. of deg., min., sec. between objects or points on sphere. Angular size or diameter--angle an object subtends at observer's distance. ...
... Angular separation (distance)--no. of deg., min., sec. between objects or points on sphere. Angular size or diameter--angle an object subtends at observer's distance. ...
Quantum Well Electron Gain Structures and Infrared
... • If planet is close in, orbit will be unstable and chaotic • Moving in/out of HZ is probably hard on life development • If planet is far away (orbiting BOTH stars), orbit is stable, but typically outside the HZ (!) ...
... • If planet is close in, orbit will be unstable and chaotic • Moving in/out of HZ is probably hard on life development • If planet is far away (orbiting BOTH stars), orbit is stable, but typically outside the HZ (!) ...
Joining the Party - Lincoln-Sudbury Regional High School
... In a larger, cooler cloud, the protons are moving more slowly and tend to be further apart. That is, the gas is at a low temperature and a low pressure. The protons have enough time, and space, to avoid each other. ...
... In a larger, cooler cloud, the protons are moving more slowly and tend to be further apart. That is, the gas is at a low temperature and a low pressure. The protons have enough time, and space, to avoid each other. ...
ES Review Power P
... The Earth rotates on its axis once every 24 hours (it rotates 360o/24 hrs.=15oper hour) The Moon revolves around the Earth once every 29 days The moon rotates on its axis once every 27-29 days The sun & stars DO NOT move in an orbit, BUT the universe is expanding (red shift). Constellations change w ...
... The Earth rotates on its axis once every 24 hours (it rotates 360o/24 hrs.=15oper hour) The Moon revolves around the Earth once every 29 days The moon rotates on its axis once every 27-29 days The sun & stars DO NOT move in an orbit, BUT the universe is expanding (red shift). Constellations change w ...
HEA_Accretion_2003_04
... • Primary accretes material with angular momentum => primary spins-up (rather than spin-down as observed in pulsars) • Rate of spin-up consistent with neutron star primary (white dwarf would be slower) • Cen X-3 ‘classical’ X-ray pulsator ...
... • Primary accretes material with angular momentum => primary spins-up (rather than spin-down as observed in pulsars) • Rate of spin-up consistent with neutron star primary (white dwarf would be slower) • Cen X-3 ‘classical’ X-ray pulsator ...
Document
... White dwarfs shine by leftover heat, no fusion. WD will cool off and fade away slowly, becoming a "Black Dwarf“. ...
... White dwarfs shine by leftover heat, no fusion. WD will cool off and fade away slowly, becoming a "Black Dwarf“. ...
スライド 1 - STScI
... monitoring an area of 3 square degrees along the bar in the LMC, and also an area of 1 square degree in the central part of the SMC. In the last 10 years, we observed these areas about 80-90 and 100-110 times for LMC and SMC, respectively. As a result, we obtained time series data with more than 3,0 ...
... monitoring an area of 3 square degrees along the bar in the LMC, and also an area of 1 square degree in the central part of the SMC. In the last 10 years, we observed these areas about 80-90 and 100-110 times for LMC and SMC, respectively. As a result, we obtained time series data with more than 3,0 ...
Stars
... A star’s stable phase ends when most of its hydrogen has been consumed by fusion. The reduction in fusion causes the core to cool. This lowers the pressure causing the star to collapse upon itself under its own gravity. As the outer layers contract, they heat up. This triggers the fusion of the rema ...
... A star’s stable phase ends when most of its hydrogen has been consumed by fusion. The reduction in fusion causes the core to cool. This lowers the pressure causing the star to collapse upon itself under its own gravity. As the outer layers contract, they heat up. This triggers the fusion of the rema ...
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.