LAB: Star Classification
... exhaustion of their nuclear fuel. During the transition from a nuclear-burning star to the white dwarf stage, the star becomes very hot. Many such objects with surface temperatures around 100 000 Kelvin are known. Theories of stellar evolution predict that the stars can be much hotter. However, the ...
... exhaustion of their nuclear fuel. During the transition from a nuclear-burning star to the white dwarf stage, the star becomes very hot. Many such objects with surface temperatures around 100 000 Kelvin are known. Theories of stellar evolution predict that the stars can be much hotter. However, the ...
Stars: Binary Systems
... i = 0o would be a face-on system which would not be very useful since sin i = 0 and the observed radial velocity for such a system would be zero. You can still get the mass ratio since m2/ m1 = v1/ v2 since the sin i’s cancel. But only a lower limit on the masses; m sin3i. ...
... i = 0o would be a face-on system which would not be very useful since sin i = 0 and the observed radial velocity for such a system would be zero. You can still get the mass ratio since m2/ m1 = v1/ v2 since the sin i’s cancel. But only a lower limit on the masses; m sin3i. ...
Introduction to Accretion Phenomena in Astrophysics
... • Algol's magnitude is usually near-constant at 2.1, but regularly dips to 3.4 during the several hour long interval which happens every 2 days, 20 hours and 49 minutes. • John Goodricke (1764-1786). He was awarded Copley Medal for the solution of the Algol mystery, 1783! ...
... • Algol's magnitude is usually near-constant at 2.1, but regularly dips to 3.4 during the several hour long interval which happens every 2 days, 20 hours and 49 minutes. • John Goodricke (1764-1786). He was awarded Copley Medal for the solution of the Algol mystery, 1783! ...
Activity: Star Classification - d
... A star is an enormous, hot ball of gas held together by ________________. ...
... A star is an enormous, hot ball of gas held together by ________________. ...
Distances farther out
... Eg. 39 Cancri : Class K0 III => Mv = +0.5. & V = 6.4 = m log(D) = 2.2 => 150 pc away But !! Giant stars have spread about average --- , If 39 Cnc is as bright as Uma (ie Mv = -0.3), then it would be 50 % farther away. In a cluster can use several stars or whole main sequence to increase precisio ...
... Eg. 39 Cancri : Class K0 III => Mv = +0.5. & V = 6.4 = m log(D) = 2.2 => 150 pc away But !! Giant stars have spread about average --- , If 39 Cnc is as bright as Uma (ie Mv = -0.3), then it would be 50 % farther away. In a cluster can use several stars or whole main sequence to increase precisio ...
Luminosity
... The Nearest Stars • If the sun were a golf ball the nearest star would be in Comox • αCentauri is nearest star at 4light years then Barnard’s star ...
... The Nearest Stars • If the sun were a golf ball the nearest star would be in Comox • αCentauri is nearest star at 4light years then Barnard’s star ...
FRAC TRIVIA I QUIZ - Flint River Astronomy Club
... 14. ( 1 pt.) True or False: If you were standing on the floor at the center of the lunar crater Clavius, you could not see its 16,100-ft. walls in any direction. 15. (1 pt.) What is the largest of the 20 brightest stars in actual size? 16. (1 pt.) Which constellation contains the most naked-eye star ...
... 14. ( 1 pt.) True or False: If you were standing on the floor at the center of the lunar crater Clavius, you could not see its 16,100-ft. walls in any direction. 15. (1 pt.) What is the largest of the 20 brightest stars in actual size? 16. (1 pt.) Which constellation contains the most naked-eye star ...
Lecture 6
... Brightness Brightness e.g. 10-12 Watts/m2 Simple and easy to understand If your eye is 10-4m2, then it collects 10-16W 4 stars at 10-12W/m2 together have 4x10-12W/m2 But this would be too easy for astronomers. We use a brightness system invented by Ptolemy in the 400’s ...
... Brightness Brightness e.g. 10-12 Watts/m2 Simple and easy to understand If your eye is 10-4m2, then it collects 10-16W 4 stars at 10-12W/m2 together have 4x10-12W/m2 But this would be too easy for astronomers. We use a brightness system invented by Ptolemy in the 400’s ...
The Life Cycle of a Star and the Hertzsprung
... stages, all at the same time. It is also a great tool to check your understanding of the star life cycle. In the Hertzsprung-Russell (HR) Diagram, each star is represented by a dot. There are lots of stars out there, so there are lots of dots. The position of each dot on the diagram tells us two thi ...
... stages, all at the same time. It is also a great tool to check your understanding of the star life cycle. In the Hertzsprung-Russell (HR) Diagram, each star is represented by a dot. There are lots of stars out there, so there are lots of dots. The position of each dot on the diagram tells us two thi ...
Stellar Evolution and the HR Diagram – Study Guide
... phosphorus, magnesium, iron, and calcium that make up our bodies. So we really are made of atoms that were formed first in the dying explosions of long dead stars. 29. MINI-Essay: How is a supernova both a beginning and an end? Supernovae are the result of the death of a star that can no longer car ...
... phosphorus, magnesium, iron, and calcium that make up our bodies. So we really are made of atoms that were formed first in the dying explosions of long dead stars. 29. MINI-Essay: How is a supernova both a beginning and an end? Supernovae are the result of the death of a star that can no longer car ...
9 spectroscopic parallax
... Absolute magnitude = how bright (what magnitude) a star would appear at 10 parsecs (32.6 light years) ...
... Absolute magnitude = how bright (what magnitude) a star would appear at 10 parsecs (32.6 light years) ...
Measuring Stars
... •Observe the star – determine it’s brightness B •Measure its spectral type from spectrum •Deduce its luminosity from the HertzsprungRussell Diagram •Find its distance from: L = 4d2B ...
... •Observe the star – determine it’s brightness B •Measure its spectral type from spectrum •Deduce its luminosity from the HertzsprungRussell Diagram •Find its distance from: L = 4d2B ...
The Constellation Microscopium, the Microscope Microscopium is a
... specimens when he depicted it spectral type G7III. Epsilon Microscopii lies 165 light years away, and is a blue-white main sequence star of apparent magnitude 4.7, and spectral type A1V. Theta1 and Theta2 Microscopii make up a wide double whose components are splittable to the naked eye. Both are wh ...
... specimens when he depicted it spectral type G7III. Epsilon Microscopii lies 165 light years away, and is a blue-white main sequence star of apparent magnitude 4.7, and spectral type A1V. Theta1 and Theta2 Microscopii make up a wide double whose components are splittable to the naked eye. Both are wh ...
Astronomy 103 Exam 2 Review
... Two observers have two clocks, one at rest on the Earth’s surface and one at rest high above the Earth’s surface. Which statement is correct? A. Each observer will see the other's clock to be running slow with respect to the observer's own clock. B. Each observer will see the other's clock ...
... Two observers have two clocks, one at rest on the Earth’s surface and one at rest high above the Earth’s surface. Which statement is correct? A. Each observer will see the other's clock to be running slow with respect to the observer's own clock. B. Each observer will see the other's clock ...
File
... Hotter and brighter in stage 2, then cooler and less bright in stage 3 Cooler and less bright in stage 2, then hotter and brighter in stage 3 Hotter and less bright in stage 2, then cooler and brighter in stage 3 Cooler and bright in stage 2, then hotter and less bright in stage 3 ...
... Hotter and brighter in stage 2, then cooler and less bright in stage 3 Cooler and less bright in stage 2, then hotter and brighter in stage 3 Hotter and less bright in stage 2, then cooler and brighter in stage 3 Cooler and bright in stage 2, then hotter and less bright in stage 3 ...
How it works:
... because it contains the brightest star in the high eastern sky, called Vega! Once you have found Vega, look for a faint parallelogram to the lower right of it. Together, these five stars make up Lyra. ...
... because it contains the brightest star in the high eastern sky, called Vega! Once you have found Vega, look for a faint parallelogram to the lower right of it. Together, these five stars make up Lyra. ...
seven winter constellations
... a small goat, marked by one bright star known as “the Mother Goat.” Just below “the Mother Goat” is a triangle of three smaller stars called “the Baby Goats.” ...
... a small goat, marked by one bright star known as “the Mother Goat.” Just below “the Mother Goat” is a triangle of three smaller stars called “the Baby Goats.” ...
File
... • To measure to greater distances, we use more indirect methods which are calibrated by stellar parallax. • All other methods, except cosmological redshift, use the 1/r2 dimming of light. – We measure apparent brightness or magnitude and compare it with absolute brightness or magnitude. ...
... • To measure to greater distances, we use more indirect methods which are calibrated by stellar parallax. • All other methods, except cosmological redshift, use the 1/r2 dimming of light. – We measure apparent brightness or magnitude and compare it with absolute brightness or magnitude. ...
Monday, April 15
... Finding the absolute Magnitude • To figure out absolute magnitude, we need to know the distance to the star • Then do the following Gedankenexperiment: – In your mind, put the star from its actual position to a position 10 pc away – If a star is actually closer than 10pc, its absolute magnitude wil ...
... Finding the absolute Magnitude • To figure out absolute magnitude, we need to know the distance to the star • Then do the following Gedankenexperiment: – In your mind, put the star from its actual position to a position 10 pc away – If a star is actually closer than 10pc, its absolute magnitude wil ...
Calculating Main Sequence Lifetimes
... the distance; if we put a star at the distance of 10 Parsec (33 year light), its magnitude is called absolute magnitude: obviously it depends only on brightness of the star. According to color, stars are grouped in classes: O, B, A, F, G, K, and M. O stars are blue and M are red - see Table A. Class ...
... the distance; if we put a star at the distance of 10 Parsec (33 year light), its magnitude is called absolute magnitude: obviously it depends only on brightness of the star. According to color, stars are grouped in classes: O, B, A, F, G, K, and M. O stars are blue and M are red - see Table A. Class ...
Night Sky Checklist April–May–June Unaided Eye Astronomy
... hunter Charles Messier roughly around the time of the American Revolution. Most deep sky objects look like “faint fuzzies” to the unaided eye, and many are attractive in binoculars or a low power telescope.) The Coma Berenices Star Cluster is a faint open cluster of about 40 stars about 280 light ye ...
... hunter Charles Messier roughly around the time of the American Revolution. Most deep sky objects look like “faint fuzzies” to the unaided eye, and many are attractive in binoculars or a low power telescope.) The Coma Berenices Star Cluster is a faint open cluster of about 40 stars about 280 light ye ...
Capella
Capella is the brightest star in the constellation Auriga, the sixth brightest in the night sky and the third brightest in the northern celestial hemisphere, after Arcturus and Vega. Its name is derived from the diminutive of the Latin capra ""goat"", hence ""little goat"". Capella also bears the Bayer designation Alpha Aurigae (often abbreviated to α Aurigae, α Aur or Alpha Aur). Although it appears to be a single star to the naked eye, it is actually a star system of four stars in two binary pairs. The first pair consists of two bright, large type-G giant stars, both with a radius around 10 times that of the Sun and two and a half times its mass, in close orbit around each other. Designated Capella Aa and Capella Ab, these two stars have both exhausted their core hydrogen fuel and become giant stars, though it is unclear exactly what stage they are on the stellar evolutionary pathway. The second pair, around 10,000 astronomical units from the first, consists of two faint, small and relatively cool red dwarfs. They are designated Capella H and Capella L. The stars labelled Capella C through to G and I through to K are actually unrelated stars in the same visual field. The Capella system is relatively close, at only 42.8 light-years (13.1 pc) from Earth.