Stellar Evolution
... consider what happens to stars as they burn their fuel, first hydrogen, then helium, etc. Stars go through different evolutionary stages as their energy source changes. This results in changes in the surface temperature (thus color), the luminosity (the energy output per second), and their sizes. In ...
... consider what happens to stars as they burn their fuel, first hydrogen, then helium, etc. Stars go through different evolutionary stages as their energy source changes. This results in changes in the surface temperature (thus color), the luminosity (the energy output per second), and their sizes. In ...
Stellar Evolution
... X-ray afterglow of GRB 970228 (GRBs are named by their date: Feb. 28, 1997) Most GRBs have gradually decaying afterglows in X-rays, some also in optical and radio. ...
... X-ray afterglow of GRB 970228 (GRBs are named by their date: Feb. 28, 1997) Most GRBs have gradually decaying afterglows in X-rays, some also in optical and radio. ...
StarWalkKiDS manual en
... Simplified, Japanese and Korean languages. Star Walk™ Kids is an excellent guide to the world of astronomy that allows you to learn the secrets of our Universe just sitting comfortably in the arm-chair or during stargazing outside. With Star Walk™ Kids you can see the following object/events: • Star ...
... Simplified, Japanese and Korean languages. Star Walk™ Kids is an excellent guide to the world of astronomy that allows you to learn the secrets of our Universe just sitting comfortably in the arm-chair or during stargazing outside. With Star Walk™ Kids you can see the following object/events: • Star ...
Science Olympiad 2008 Reach for the Stars Division B
... most determines how they will differ? A) location where they are formed B) time they are formed C) luminosity they are formed with D) mass they are formed with E) color they are formed with 111. The spectral sequence sorts stars according to: (choose as many as apply) A) mass B) surface temperature ...
... most determines how they will differ? A) location where they are formed B) time they are formed C) luminosity they are formed with D) mass they are formed with E) color they are formed with 111. The spectral sequence sorts stars according to: (choose as many as apply) A) mass B) surface temperature ...
Lect16-3-28-and-30-1..
... Thus we predict that there should be a greater relative abundance of heavier elements with even numbers of protons. This is indeed the case, as is shown on the next slide. ...
... Thus we predict that there should be a greater relative abundance of heavier elements with even numbers of protons. This is indeed the case, as is shown on the next slide. ...
Natasha Wood
... Mentors: Marco Ajello & Masaaki Hayashida How will you be doing the comparisons? An active galactic nucleus (AGN) is a relatively small region of space at the center of a galaxy that is very luminous over all or part of the electromagnetic spectrum1. This radiation is theorized to be a product of ma ...
... Mentors: Marco Ajello & Masaaki Hayashida How will you be doing the comparisons? An active galactic nucleus (AGN) is a relatively small region of space at the center of a galaxy that is very luminous over all or part of the electromagnetic spectrum1. This radiation is theorized to be a product of ma ...
Document
... Exceeding a certain density, matter may preferentially be in the form of free (unconfined) quarks. In addition, because the strange quark mass is close to u and d quarks, the “soup” may contain u, d, and s. Quark/hybrid stars: typically refer to a NS whose cores contain a mixed phase of confined and ...
... Exceeding a certain density, matter may preferentially be in the form of free (unconfined) quarks. In addition, because the strange quark mass is close to u and d quarks, the “soup” may contain u, d, and s. Quark/hybrid stars: typically refer to a NS whose cores contain a mixed phase of confined and ...
Slide 1
... • In addition to “normal” stars, there are also red giants, red supergiants, blue giants, blue supergiants, red dwarfs, and white dwarfs • Luminosity class can distinguish giant star from main-sequence one in the same spectral class • If spectrum is measured, can find luminosity; combining this with ...
... • In addition to “normal” stars, there are also red giants, red supergiants, blue giants, blue supergiants, red dwarfs, and white dwarfs • Luminosity class can distinguish giant star from main-sequence one in the same spectral class • If spectrum is measured, can find luminosity; combining this with ...
17_LectureOutline
... • In addition to “normal” stars, there are also red giants, red supergiants, blue giants, blue supergiants, red dwarfs, and white dwarfs • Luminosity class can distinguish giant star from main-sequence one in the same spectral class • If spectrum is measured, can find luminosity; combining this with ...
... • In addition to “normal” stars, there are also red giants, red supergiants, blue giants, blue supergiants, red dwarfs, and white dwarfs • Luminosity class can distinguish giant star from main-sequence one in the same spectral class • If spectrum is measured, can find luminosity; combining this with ...
Part I Light, Telescopes, Atoms and Stars
... cooler type of star called an L dwarf has been observed that extends the classifications one more full notch cooler ...
... cooler type of star called an L dwarf has been observed that extends the classifications one more full notch cooler ...
Outlook: Disk structure models
... - comparison with observations by scanning through the disk with e.g. VISIR, IRAM, ALMA in the NIR to submm feedback for the models - evaporation of the inner disk as a function of spectral-type of central star ...
... - comparison with observations by scanning through the disk with e.g. VISIR, IRAM, ALMA in the NIR to submm feedback for the models - evaporation of the inner disk as a function of spectral-type of central star ...
The Life Cycles of Stars
... Black Holes- Black holes are another resulting body created after a supernova, usually having to be greater than at least 3.0 solar masses. When a star collapses at such a size, the stellar object becomes incredibly small and dense, resulting in a gravitational pull so powerful that radiation (heat) ...
... Black Holes- Black holes are another resulting body created after a supernova, usually having to be greater than at least 3.0 solar masses. When a star collapses at such a size, the stellar object becomes incredibly small and dense, resulting in a gravitational pull so powerful that radiation (heat) ...
EXPLORATION OF THE KUIPER BELT BY HIGH
... photometric data from Neptune and Uranus occultation observations obtained for different purposes (Sicardy et al. 1991). The conditions of observation were similar, but, with a projected radius >10 km at 40 AU, these stars should not have shown diffraction occultation events. Using the same procedur ...
... photometric data from Neptune and Uranus occultation observations obtained for different purposes (Sicardy et al. 1991). The conditions of observation were similar, but, with a projected radius >10 km at 40 AU, these stars should not have shown diffraction occultation events. Using the same procedur ...
I. Determination of stellar Parameters
... temperature precisely • further parameters can be derived: – surface gravity ...
... temperature precisely • further parameters can be derived: – surface gravity ...
poster
... young star forming region, are found below the canonical ISM ratio, while isolated nearby stars from the GS08 sample (mostly in TWA and Taurus) lie above it. The ratio is influenced by several factors, the most promising explanations are a change in the gas-to-dust ratio or in the grain properties. ...
... young star forming region, are found below the canonical ISM ratio, while isolated nearby stars from the GS08 sample (mostly in TWA and Taurus) lie above it. The ratio is influenced by several factors, the most promising explanations are a change in the gas-to-dust ratio or in the grain properties. ...
Contents ISP 205 Section 2 Study Guide for Test 3 28 March 2007
... o Giants burn hydrogen in a shell, helium, or other elements White dwarfs are earth-sized, dead stars. Main sequence is a mass sequence o O stars are massive o M stars have least mass Hot massive stars live a short life and cool stars live a long time o Lifetime=mass/luminosity o Comparison: If sun ...
... o Giants burn hydrogen in a shell, helium, or other elements White dwarfs are earth-sized, dead stars. Main sequence is a mass sequence o O stars are massive o M stars have least mass Hot massive stars live a short life and cool stars live a long time o Lifetime=mass/luminosity o Comparison: If sun ...
Nucleosynthesis of heavy elements in gamma ray bursts
... Gamma Ray Bursts (GRB) are the extremely energetic transient events, visible from the most distant parts of the Universe. They are most likely powered by accretion on the hyper-Eddington rates that proceeds onto a stellar mass black hole newly formed in the center of a rotating collapsing star or vi ...
... Gamma Ray Bursts (GRB) are the extremely energetic transient events, visible from the most distant parts of the Universe. They are most likely powered by accretion on the hyper-Eddington rates that proceeds onto a stellar mass black hole newly formed in the center of a rotating collapsing star or vi ...
Document
... The iron core mass is a (nucleosynthetic) lower limit to the baryonic mass of the neutron star. A large entropy jump characterizes the base of the oxygen shell and may provide a natural location for the mass cut. Naively the baryonic mass of the remnant may be between these two – but this is very cr ...
... The iron core mass is a (nucleosynthetic) lower limit to the baryonic mass of the neutron star. A large entropy jump characterizes the base of the oxygen shell and may provide a natural location for the mass cut. Naively the baryonic mass of the remnant may be between these two – but this is very cr ...
Exam 03
... A) Because the interstellar medium is predominantly hydrogen, the H-α line makes stars all appear red. B) When viewed through a cloud of interstellar gas and dust,a star will appear redder than it actually is. The blue light it emits will be scattered more by the cloud than the red light will be. C) ...
... A) Because the interstellar medium is predominantly hydrogen, the H-α line makes stars all appear red. B) When viewed through a cloud of interstellar gas and dust,a star will appear redder than it actually is. The blue light it emits will be scattered more by the cloud than the red light will be. C) ...
Cygnus X-1
Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source, thought to be a black hole, in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 6977229999999999999♠2.3×10−23 Wm−2 Hz−1 (7003230000000000000♠2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole and it remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too small to be any known kind of normal star, or other likely object besides a black hole. If so, the radius of its event horizon is about 7004440000000000000♠44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 7019574266339685654♠6070 ly from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 7001400000000000000♠40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1975, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.