The Physical Properties of Normal A Stars
... I give the name, spectral type, Teff, log g, log Fe/H, log Si/log Sr, v sin i, and . My “model” was that stars rotating sufficiently fast have normal abundances all over their surfaces. When the rotation decreases below some critical value, the poles begin to show peculiar abundances. These regions ...
... I give the name, spectral type, Teff, log g, log Fe/H, log Si/log Sr, v sin i, and . My “model” was that stars rotating sufficiently fast have normal abundances all over their surfaces. When the rotation decreases below some critical value, the poles begin to show peculiar abundances. These regions ...
Asteroseismology of Solar-Like Stars
... With these scaling relations and an independent source of Tef f , the project can progress, and power spectra, along with stellar parameters can be determined. ...
... With these scaling relations and an independent source of Tef f , the project can progress, and power spectra, along with stellar parameters can be determined. ...
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. ...
Star formation and internal kinematics of irregular galaxies
... the picture that I will proceed with in this thesis; that star formation is a local process, with the same basic physics occuring in independent cells with dimensions between tens of parsecs and a couple of kiloparsecs. Thus a galaxy’s global structure and dynamics can be viewed as an organising fra ...
... the picture that I will proceed with in this thesis; that star formation is a local process, with the same basic physics occuring in independent cells with dimensions between tens of parsecs and a couple of kiloparsecs. Thus a galaxy’s global structure and dynamics can be viewed as an organising fra ...
1. The catalogue structure
... translates as “named”). Thus, “vocatur Arcturus” stands for “star named Arcturus”. All these stars are represented as large black dots in fig. 2.1. They are as follows: Arcturus, Previndemiatrix, Spica, Regulus, Acelli, Sirius, Procyon, Lyra = Vega, Cappella, Aquila, Canopus and Antares. We see that ...
... translates as “named”). Thus, “vocatur Arcturus” stands for “star named Arcturus”. All these stars are represented as large black dots in fig. 2.1. They are as follows: Arcturus, Previndemiatrix, Spica, Regulus, Acelli, Sirius, Procyon, Lyra = Vega, Cappella, Aquila, Canopus and Antares. We see that ...
Chapter 20
... arms—because a wave of compression passes by. Still another possibility is that a nearby star explodes (a “supernova”; see Chapter 13), sending out a shock wave that compresses the gas and dust. ...
... arms—because a wave of compression passes by. Still another possibility is that a nearby star explodes (a “supernova”; see Chapter 13), sending out a shock wave that compresses the gas and dust. ...
Distance
... parallax technique enables – (a) To refine the accepted distance scale and absolute magnitude calibration used – (b) To take into account all observational errors – (c) To calculate full set of kinematical parameters of a given uniform stellar sample (space velocity of the Sun, rotation curve or oth ...
... parallax technique enables – (a) To refine the accepted distance scale and absolute magnitude calibration used – (b) To take into account all observational errors – (c) To calculate full set of kinematical parameters of a given uniform stellar sample (space velocity of the Sun, rotation curve or oth ...
How to Directly Image a Habitable Planet Around Alpha Centauri
... sensitivities. It is commonly thought that directly imaging a potentially habitable planet around a Sun-like star requires telescope apertures of at least 1m, costing at least $1B, and launching no earlier than the mid-2020s and more likely the 2030s. This conventional wisdom is probably correct for ...
... sensitivities. It is commonly thought that directly imaging a potentially habitable planet around a Sun-like star requires telescope apertures of at least 1m, costing at least $1B, and launching no earlier than the mid-2020s and more likely the 2030s. This conventional wisdom is probably correct for ...
The Bigger Picture - Astronomy and Astrophysics
... • We live on the outskirts of a pretty good-sized spiral galaxy composed of about 100 billion stars. • There are only about 6000 stars that you can see with the unaided eye -- not even the tip of the iceberg. • At a dark site, you can see a diffuse glow tracing and arc across the sky. This is the Mi ...
... • We live on the outskirts of a pretty good-sized spiral galaxy composed of about 100 billion stars. • There are only about 6000 stars that you can see with the unaided eye -- not even the tip of the iceberg. • At a dark site, you can see a diffuse glow tracing and arc across the sky. This is the Mi ...
The Official Magazine of the University Of St Andrews Astronomical Society 1
... The vast majority of exoplanets found have been large gas giants, close to their parent star, with orbital periods of only a few days. Our gas giants, however, are orders of magnitude more distant from the sun than typical exoplanets are from their stars. Why is our Solar system so different to – wh ...
... The vast majority of exoplanets found have been large gas giants, close to their parent star, with orbital periods of only a few days. Our gas giants, however, are orders of magnitude more distant from the sun than typical exoplanets are from their stars. Why is our Solar system so different to – wh ...
Anatomy of a Supernova - hrsbstaff.ednet.ns.ca
... temperatures is extremely thorough, everything that can burn, does. All that's left are iron, cobalt, and nickel — the socalled iron-peak elements. Burning stops at these elements because making stillheavier ones would absorb more energy tban is released. Astronomers realized early on that detonatio ...
... temperatures is extremely thorough, everything that can burn, does. All that's left are iron, cobalt, and nickel — the socalled iron-peak elements. Burning stops at these elements because making stillheavier ones would absorb more energy tban is released. Astronomers realized early on that detonatio ...
HD 140283: A Star in the Solar Neighborhood that Formed Shortly
... parallax would be a nearby extremely metal-deficient star, with a well-determined chemical composition based on high-resolution spectroscopy, which has begun to evolve off the main sequence in the Hertzsprung-Russell diagram (HRD). The one star that best satisfies these criteria is HD 140283, a brig ...
... parallax would be a nearby extremely metal-deficient star, with a well-determined chemical composition based on high-resolution spectroscopy, which has begun to evolve off the main sequence in the Hertzsprung-Russell diagram (HRD). The one star that best satisfies these criteria is HD 140283, a brig ...
The Sun
... – A binary star is two stars that are gravitationally bound together and that orbit a common center of mass. – More than half of the stars in the sky are either binary stars or members of multiple-star systems. – Astronomers are able to identify binary stars through several methods. • Accurate measu ...
... – A binary star is two stars that are gravitationally bound together and that orbit a common center of mass. – More than half of the stars in the sky are either binary stars or members of multiple-star systems. – Astronomers are able to identify binary stars through several methods. • Accurate measu ...
ppt
... planet's size, distance from star, and orbital period. With velocity measurements, could then get planet's mass and hence density (rocky, gas giant?) *Massive planet like Jupiter that is very close to the star ...
... planet's size, distance from star, and orbital period. With velocity measurements, could then get planet's mass and hence density (rocky, gas giant?) *Massive planet like Jupiter that is very close to the star ...
Iron does not burn.
... sequence. The points plotted here are for stars lying within about 5 pc of the Sun. The diagonal lines correspond to constant stellar radius, so that stellar size can be represented on the same diagram as luminosity and temperature. The first H-R diagrams considered stars in the solar neighbourhood ...
... sequence. The points plotted here are for stars lying within about 5 pc of the Sun. The diagonal lines correspond to constant stellar radius, so that stellar size can be represented on the same diagram as luminosity and temperature. The first H-R diagrams considered stars in the solar neighbourhood ...
phys-1600 - Dave Heppenstall
... moon's rocks are fundamentally different from the Earth's crust material. • The current leading theory explaining the existence of the moon is that during the formation of the earth, a massive collision between the earth and another object took place at which point portions of the two objects flew o ...
... moon's rocks are fundamentally different from the Earth's crust material. • The current leading theory explaining the existence of the moon is that during the formation of the earth, a massive collision between the earth and another object took place at which point portions of the two objects flew o ...
Tutor Marked Assignment
... (b) What is the Chandrasekhar limit? Discuss the fate of stars whose masses are beyond the Chandrasekhar limit. (c) What causes emission of pulses from a rotating neutron star? ...
... (b) What is the Chandrasekhar limit? Discuss the fate of stars whose masses are beyond the Chandrasekhar limit. (c) What causes emission of pulses from a rotating neutron star? ...
ES Chapter 30
... – A binary star is two stars that are gravitationally bound together and that orbit a common center of mass. – More than half of the stars in the sky are either binary stars or members of multiple-star systems. – Astronomers are able to identify binary stars through several methods. • Accurate measu ...
... – A binary star is two stars that are gravitationally bound together and that orbit a common center of mass. – More than half of the stars in the sky are either binary stars or members of multiple-star systems. – Astronomers are able to identify binary stars through several methods. • Accurate measu ...
PC3692: Physics of Stellar Structure (and Evolution)
... right. This sequence is called main sequence. You also see a clump of to the right of the main sequence, these stars are called red clump stars, and the stars further to the right, red giants. You can also vaguely see some stars in the bottom left; these are white dwarf stars, they are hot and very ...
... right. This sequence is called main sequence. You also see a clump of to the right of the main sequence, these stars are called red clump stars, and the stars further to the right, red giants. You can also vaguely see some stars in the bottom left; these are white dwarf stars, they are hot and very ...
Scientific requirements of ALMA, and its capabilities for key
... Image gas kinematics in protostars and protoplanetary disks around Sun-like stars at 140pc distance, enabling one to study their physical, chemical and magnetic field structures and to detect the gaps created by planets undergoing formation in the disk. Provide precise images at 0.1 arcsec resolutio ...
... Image gas kinematics in protostars and protoplanetary disks around Sun-like stars at 140pc distance, enabling one to study their physical, chemical and magnetic field structures and to detect the gaps created by planets undergoing formation in the disk. Provide precise images at 0.1 arcsec resolutio ...
Slides from the fourth lecture
... – The localization of the short-duration, hard-spectrum GRB 050509b was a watershed event. Thanks to the nearly immediate relay of the GRB position by Swift, we began imaging the GRB field 8 minutes after the burst and continued for the following 8 days. No convincing optical/infrared candidate afte ...
... – The localization of the short-duration, hard-spectrum GRB 050509b was a watershed event. Thanks to the nearly immediate relay of the GRB position by Swift, we began imaging the GRB field 8 minutes after the burst and continued for the following 8 days. No convincing optical/infrared candidate afte ...
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.