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? ...
using a cepheid variable to determine distance
... where L is luminosity in solar units T is the period in days To find the absolute magnitude M once the luminosity is known, use the equation M = 4.8 - 2.5 log(L) ...
... where L is luminosity in solar units T is the period in days To find the absolute magnitude M once the luminosity is known, use the equation M = 4.8 - 2.5 log(L) ...
The Great Debate - The Story Behind The Science
... The significance of this rotational period requires understanding Shapley's size of the Milky Way. Shapley had been a supporter of the island universe idea until he determined the Milky Way to be 300,000 light-years in diameter (10x larger than the consensus estimate). He concluded this by measuring ...
... The significance of this rotational period requires understanding Shapley's size of the Milky Way. Shapley had been a supporter of the island universe idea until he determined the Milky Way to be 300,000 light-years in diameter (10x larger than the consensus estimate). He concluded this by measuring ...
Part1
... (broad), and narrow features (lines) … o other shape at very long (synchrotron, thin free free) … o mm and radio emission is a footnote (useful as a tracer of conditions). ...
... (broad), and narrow features (lines) … o other shape at very long (synchrotron, thin free free) … o mm and radio emission is a footnote (useful as a tracer of conditions). ...
Amanda Boyle Starstuff
... and most luminous stars are born first, and there are only a few of these O and B Stars. As you go down the line, more and more of each kind exist with the most common being M. Our Sun is a G. Not as in a gangster, or bro though in a way our sun is a bro because without the sun we would be dead. Bec ...
... and most luminous stars are born first, and there are only a few of these O and B Stars. As you go down the line, more and more of each kind exist with the most common being M. Our Sun is a G. Not as in a gangster, or bro though in a way our sun is a bro because without the sun we would be dead. Bec ...
Time From the Perspective of a Particle Physicist
... 1. Determine Surface Temperature + spectral class of star 2. Determine where on HR diagram should go 3. Read off absolute luminosity from HR diagram 4. Measure apparent luminosity and calculate distance • works best if many close-by stars ...
... 1. Determine Surface Temperature + spectral class of star 2. Determine where on HR diagram should go 3. Read off absolute luminosity from HR diagram 4. Measure apparent luminosity and calculate distance • works best if many close-by stars ...
Barium Stars Observed with the Coude Echelle Spectrometer
... The Optical Pulsar H 2252-035 (AO Psc) M. KUbiak, Warsaw University Observatory, Poland, and Hoher List Observatorium, FRG The optical counterpart of the pulsating X-ray source H 2252035 appeared to be an interesting object for optical astronomers also. In the X-ray domain it shows the same characte ...
... The Optical Pulsar H 2252-035 (AO Psc) M. KUbiak, Warsaw University Observatory, Poland, and Hoher List Observatorium, FRG The optical counterpart of the pulsating X-ray source H 2252035 appeared to be an interesting object for optical astronomers also. In the X-ray domain it shows the same characte ...
Definitions of Magnitudes and Surface Brightness
... surface brightness of radio sources. Unfortunately the definition of the first does not coincide with the second two. In the context of the radiation field, the surface brightness of an optically thin source is given by ...
... surface brightness of radio sources. Unfortunately the definition of the first does not coincide with the second two. In the context of the radiation field, the surface brightness of an optically thin source is given by ...
Stars and Galaxies - La Salle Elementary Public Schools No 122
... • When a star’s hydrogen supply is nearly gone, the star leaves the main sequence and begins the next stage of its life cycle. • All stars form in the same way, but stars die in different ways, depending on their masses. ...
... • When a star’s hydrogen supply is nearly gone, the star leaves the main sequence and begins the next stage of its life cycle. • All stars form in the same way, but stars die in different ways, depending on their masses. ...
October 2014 - Newbury Astronomical Society
... the star. Later this sequence was found to be wrong. However the class letters for each kind of star were retained but now they are not in alphabetical order. A star like our Sun will spend a few million years in its very active pre-main sequence phase then settle into its normal life. The luminosit ...
... the star. Later this sequence was found to be wrong. However the class letters for each kind of star were retained but now they are not in alphabetical order. A star like our Sun will spend a few million years in its very active pre-main sequence phase then settle into its normal life. The luminosit ...
Today in Astronomy 142: observations of stars
... Flux and luminosity Primary observable quantity: flux, f, (power per unit area) within some range of wavelengths. The flux at the surface of an emitting object is often called the surface brightness. Most stars, like many astronomical objects, emit light isotropically (same in all directions) ! Sin ...
... Flux and luminosity Primary observable quantity: flux, f, (power per unit area) within some range of wavelengths. The flux at the surface of an emitting object is often called the surface brightness. Most stars, like many astronomical objects, emit light isotropically (same in all directions) ! Sin ...
Which Constellation is Which?
... You probably know some constellations. The Big Dipper looks like a giant pot with a long handle. Orion is named after a great hunter. You can see his belt, marked by three bright stars. Constellations are imaginary pictures in the sky. The stars look like they are all the same distance away. That’s ...
... You probably know some constellations. The Big Dipper looks like a giant pot with a long handle. Orion is named after a great hunter. You can see his belt, marked by three bright stars. Constellations are imaginary pictures in the sky. The stars look like they are all the same distance away. That’s ...
Separating Stars and Galaxies Based on Color
... are evident more so in some color-color diagrams than in others. In either case, the stellar locus can be defined by fitting exclusively stellar data to a polynomial, and then applying that line to the entirety of the data (including non-stellar objects). Color-color diagrams become more complicated ...
... are evident more so in some color-color diagrams than in others. In either case, the stellar locus can be defined by fitting exclusively stellar data to a polynomial, and then applying that line to the entirety of the data (including non-stellar objects). Color-color diagrams become more complicated ...
The formation of the galaxy is believed to be similar
... The position of the Sun in the Milky Way Galaxy is best described as a) in the disk, slightly more than halfway out from the center. b) very close to the center. c) in an open cluster in the disk. d) in a globular cluster in the halo. ...
... The position of the Sun in the Milky Way Galaxy is best described as a) in the disk, slightly more than halfway out from the center. b) very close to the center. c) in an open cluster in the disk. d) in a globular cluster in the halo. ...
New light on our Sun`s fate - Space Telescope Science Institute
... white dwarf properties of a hydrogen-burning star shining in the night sky. Similarly, for a nearby white dwarf, we have no way to infer the initial sun’s mass. (Astronomers refer to this initial star as the progenitor.) But we do have “laboratories” to tackle the problem: star clusters, environment ...
... white dwarf properties of a hydrogen-burning star shining in the night sky. Similarly, for a nearby white dwarf, we have no way to infer the initial sun’s mass. (Astronomers refer to this initial star as the progenitor.) But we do have “laboratories” to tackle the problem: star clusters, environment ...
Measuring the Properties of Stars (ch. 17)
... The only method for directly determining the masses of stars is from binary stars, using Newton’s form of Kepler’s 3rd law. There are three types of binary stars, which depend on how close they are to each other, their relative brightnesses, the distance of the binary, and other factors: a.Visual bi ...
... The only method for directly determining the masses of stars is from binary stars, using Newton’s form of Kepler’s 3rd law. There are three types of binary stars, which depend on how close they are to each other, their relative brightnesses, the distance of the binary, and other factors: a.Visual bi ...
Centimeter and Millimeter Observations of Very Young Binary Systems
... • They last between 2 and 10 million years. • But little is known about their formation, about their earliest stages. • It can be argued theoretically that the disks should start small and grow with time… ...
... • They last between 2 and 10 million years. • But little is known about their formation, about their earliest stages. • It can be argued theoretically that the disks should start small and grow with time… ...
Magnitudes - Astronomy @ Walton High School
... We measure the brightness of a star by its magnitude. There are two types of magnitude: Apparent magnitude is how bright an object is to us on Earth. Absolute magnitude is how bright a star would appear in space from a certain distance. ...
... We measure the brightness of a star by its magnitude. There are two types of magnitude: Apparent magnitude is how bright an object is to us on Earth. Absolute magnitude is how bright a star would appear in space from a certain distance. ...
SHELL H II REGIONS IN NGC 6334
... • They last between 2 and 10 million years. • But little is known about their formation, about their earliest stages. • It can be argued theoretically that the disks should start small and grow with time… ...
... • They last between 2 and 10 million years. • But little is known about their formation, about their earliest stages. • It can be argued theoretically that the disks should start small and grow with time… ...
observing cards - NC Science Festival
... they don’t know what else to ask. By opening with a story, you encourage relevant questions. This also allows you to read your visitors’ interests and knowledge levels. • Give Context: Most people have no concept of the distance involved in a light-year or how long a billion years is. Stories engag ...
... they don’t know what else to ask. By opening with a story, you encourage relevant questions. This also allows you to read your visitors’ interests and knowledge levels. • Give Context: Most people have no concept of the distance involved in a light-year or how long a billion years is. Stories engag ...
Chapter 3 Cosmology 3.1 The Doppler effect
... that the expansion of the Universe is accelerating and has been for about the past 5000 million years. Before this discovery, most astronomers expected that the Universe was decelerating because very distant objects would be slowed down by the force of gravity from other galaxies. Many more observat ...
... that the expansion of the Universe is accelerating and has been for about the past 5000 million years. Before this discovery, most astronomers expected that the Universe was decelerating because very distant objects would be slowed down by the force of gravity from other galaxies. Many more observat ...
The Pistol Star - Emmi
... for Prometheus. Prometheus was punished for giving fire to man. His punishment was being chained to a rock. Each day an eagle would come and eat his liver and each night it would grow back. Jupiter(a god) had agreed to release Prometheus if a substitute could be found. ...
... for Prometheus. Prometheus was punished for giving fire to man. His punishment was being chained to a rock. Each day an eagle would come and eat his liver and each night it would grow back. Jupiter(a god) had agreed to release Prometheus if a substitute could be found. ...
HR Diagram Activity - Mr. Alster`s Science Classes
... Purpose: In this lab we will investigate the relationship between the temperature, brightness and diameter of stars. Introduction The H-R Diagram is a tool that astronomers use to classify stars based on their luminosity, magnitude, temperature, spectral class and evolutionary stage. The H-R Diagram ...
... Purpose: In this lab we will investigate the relationship between the temperature, brightness and diameter of stars. Introduction The H-R Diagram is a tool that astronomers use to classify stars based on their luminosity, magnitude, temperature, spectral class and evolutionary stage. The H-R Diagram ...
Quasars- The Brightest Black Holes
... Universe, there is a direct relationship (established in the late 1920’s as Hubble’s law) between the speed with which a cosmic object is receding and its distance away from us – the further objects move away faster. 3C273’s redshift indicated that this ‘star’ was two and a half billion light-years ...
... Universe, there is a direct relationship (established in the late 1920’s as Hubble’s law) between the speed with which a cosmic object is receding and its distance away from us – the further objects move away faster. 3C273’s redshift indicated that this ‘star’ was two and a half billion light-years ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.