ASTR 553/554 (1) : Questions
... questions that follow, work with either I(R) or µ(R), which ever your prefer. b. What's the surface brightness, I(0), at the center of the Milky Way disk, and what's the disk's total luminosity in LV, . c. Using MV, = 4.82, calculate the Milky Way's absolute magnitude, MV. If viewed from Virgo (dist ...
... questions that follow, work with either I(R) or µ(R), which ever your prefer. b. What's the surface brightness, I(0), at the center of the Milky Way disk, and what's the disk's total luminosity in LV, . c. Using MV, = 4.82, calculate the Milky Way's absolute magnitude, MV. If viewed from Virgo (dist ...
PH607 – Galaxies
... to several hundred km/s - later to be determined to be due to the expansion of the Universe. Curtis believed that the spiral nebulae are galaxies like our own lying at distances ranging from 150 kpc (M31) to 3,000 kpc for the most distant systems. Shapley believed the spirals were part of our Galaxy ...
... to several hundred km/s - later to be determined to be due to the expansion of the Universe. Curtis believed that the spiral nebulae are galaxies like our own lying at distances ranging from 150 kpc (M31) to 3,000 kpc for the most distant systems. Shapley believed the spirals were part of our Galaxy ...
answer key
... Astronomers initially (before 1920) classified stars by their hydrogen-line intensities and labelled them alphabetically A through P. “As” had a stronger hydrogen signature – hence were thought to have more hydrogen – than “Bs”, with “Ps” theoretically having the least hydrogen of all. As time went ...
... Astronomers initially (before 1920) classified stars by their hydrogen-line intensities and labelled them alphabetically A through P. “As” had a stronger hydrogen signature – hence were thought to have more hydrogen – than “Bs”, with “Ps” theoretically having the least hydrogen of all. As time went ...
The Night Sky
... may be conveyed from one to another, is to me so great an absurdity that I believe no man, who has in philosophical matters a competent faculty of thinking, can ever fall into it. (Newton. Letter to ...
... may be conveyed from one to another, is to me so great an absurdity that I believe no man, who has in philosophical matters a competent faculty of thinking, can ever fall into it. (Newton. Letter to ...
File
... As time goes by, the water evaporates very slowly from the solution , so sugar molecules continue to come out of the remaining solution and move onto the seed crystals on the string. Sugar molecules have a particular shape; they don't, for example, look like snow or diamond crystals. After millions ...
... As time goes by, the water evaporates very slowly from the solution , so sugar molecules continue to come out of the remaining solution and move onto the seed crystals on the string. Sugar molecules have a particular shape; they don't, for example, look like snow or diamond crystals. After millions ...
Observational Astronomy - Spring 2014 Homework 7
... • Spacecraft take hundreds to thousands of watts of power, so it would take really large solar cells to power a spacecraft at Neptune, too large to be practical. For this reason, deep-space missions are nuclear powered. 3. What process powers the stars? What element does the Sun consume for fuel and ...
... • Spacecraft take hundreds to thousands of watts of power, so it would take really large solar cells to power a spacecraft at Neptune, too large to be practical. For this reason, deep-space missions are nuclear powered. 3. What process powers the stars? What element does the Sun consume for fuel and ...
What are the Spectral Lines? - University of Texas Astronomy Home
... - real knowledge only due to hard facts, e.g., laboratory science, measurements • claimed ...
... - real knowledge only due to hard facts, e.g., laboratory science, measurements • claimed ...
Parallaxes are very small The position of Ursa Major
... The images to the left show Barnard's star, which has the largest proper motion of all stars. It moves by 10.4 arcseconds per year and its parallax amounts to 0.55 arcseconds. Can you spot the star in the photos to the left? ...
... The images to the left show Barnard's star, which has the largest proper motion of all stars. It moves by 10.4 arcseconds per year and its parallax amounts to 0.55 arcseconds. Can you spot the star in the photos to the left? ...
doc
... [The lucky placement of a “resonance” without which there would be no carbon or anything heavier is discussed in class.] This reaction requires T~100 million degrees K, which the core has attained by its contraction and heating. But for low mass stars (less than about 2 Mo), when the He gets hot eno ...
... [The lucky placement of a “resonance” without which there would be no carbon or anything heavier is discussed in class.] This reaction requires T~100 million degrees K, which the core has attained by its contraction and heating. But for low mass stars (less than about 2 Mo), when the He gets hot eno ...
Notes_ stars and sun
... • A more practical use for constellations was in farming cultures. • People began to learn that when Orion was fully visible, that winter was coming soon. • The star patterns made it easier for early farming cultures to know when to plant. • Constellations were named from the Greeks. • They are ...
... • A more practical use for constellations was in farming cultures. • People began to learn that when Orion was fully visible, that winter was coming soon. • The star patterns made it easier for early farming cultures to know when to plant. • Constellations were named from the Greeks. • They are ...
Earth and Space - Sun, Moon and Stars
... SI.2.C Gather and communicate information from careful observations and simple investigation through a variety of methods. ...
... SI.2.C Gather and communicate information from careful observations and simple investigation through a variety of methods. ...
Space Key Word Search
... supermassive black holes; radiation is emitted into space as material falls into a black hole, usually at the center of a galaxy - this is referred to as an AGN - Active Galactic Nucleus; extremely far away. ...
... supermassive black holes; radiation is emitted into space as material falls into a black hole, usually at the center of a galaxy - this is referred to as an AGN - Active Galactic Nucleus; extremely far away. ...
The Sizes of Stars
... a disk, this will cause the atoms will rub up against each other. There will be friction! So The material will lose orbital energy and spiral in The disk will get real hot. The faster the gas moves, the greater the friction, and the hotter the disk. If the companion star is compact (white dwarf, ...
... a disk, this will cause the atoms will rub up against each other. There will be friction! So The material will lose orbital energy and spiral in The disk will get real hot. The faster the gas moves, the greater the friction, and the hotter the disk. If the companion star is compact (white dwarf, ...
(HR) Diagrams
... 5. How many sub-types are there in each spectral class? a. For instance, in the range of A type stars, how many A sub-types are there and what are their names? b. Write down the spectral class of the sub-type halfway between K and M. 6. Which is the hottest type of star, O, B, A, F, G, K or M? Circ ...
... 5. How many sub-types are there in each spectral class? a. For instance, in the range of A type stars, how many A sub-types are there and what are their names? b. Write down the spectral class of the sub-type halfway between K and M. 6. Which is the hottest type of star, O, B, A, F, G, K or M? Circ ...
Goals of the day Clickers Order of Magnitude Astronomy
... A radio message from outer space arrived today which was sent from planet Buff on the day you were born. The friendly aliens sending you the birthday message live: ...
... A radio message from outer space arrived today which was sent from planet Buff on the day you were born. The friendly aliens sending you the birthday message live: ...
Summer 2001 Day 07: Intro to Solar System
... circle (i.e. within the confines of this building), the NEAREST next star would be in CORTLAND! (3) A parsec is real big! (4) Miles – km analogy Practice Problem #1 & #2 2) Proper Motion and Radial Velocity A) Stars are not truly fixed in the sky, but move in two ways B) Towards or away from the Sun ...
... circle (i.e. within the confines of this building), the NEAREST next star would be in CORTLAND! (3) A parsec is real big! (4) Miles – km analogy Practice Problem #1 & #2 2) Proper Motion and Radial Velocity A) Stars are not truly fixed in the sky, but move in two ways B) Towards or away from the Sun ...
Electromagnetic Radiation from the Sun
... Spectral class, distance, temperature, age, chemical composition, mass, radial velocity, rotational velocity, expansion or contraction, ionization level, luminosity, magnetic fields, spectroscopic binary systems, emission nebulae, interstellar absorption lines and more. 8. Are all elements found in ...
... Spectral class, distance, temperature, age, chemical composition, mass, radial velocity, rotational velocity, expansion or contraction, ionization level, luminosity, magnetic fields, spectroscopic binary systems, emission nebulae, interstellar absorption lines and more. 8. Are all elements found in ...
Stellar kinematics
Stellar kinematics is the study of the movement of stars without needing to understand how they acquired their motion. This differs from stellar dynamics, which takes into account gravitational effects. The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding part of the Milky Way.In astronomy, it is widely accepted that most stars are born within molecular clouds known as stellar nurseries. The stars formed within such a cloud compose open clusters containing dozens to thousands of members. These clusters dissociate over time. Stars that separate themselves from the cluster's core are designated as members of the cluster's stellar association. If the remnant later drifts through the Milky Way as a coherent assemblage, then it is termed a moving group.