Astronomy 102, Spring 2003 Solutions to Review Problems
... Sometimes there’s just no way to know. We observe supernovae now where the type is in doubt; the lightcurve and spectrum are consistent with both types. This is also true of remnants observed from historical supernoave. 2. Consider a binary system consisting of a main sequence star and a white dwarf ...
... Sometimes there’s just no way to know. We observe supernovae now where the type is in doubt; the lightcurve and spectrum are consistent with both types. This is also true of remnants observed from historical supernoave. 2. Consider a binary system consisting of a main sequence star and a white dwarf ...
HR Diagram
... tell not only the temperature of a star by its spectra, but also whether it was an average star (called mainsequence), a giant, or a white dwarf. Several classifications of stars were identified from the H-R diagram, called luminosity classes. They were given a designation as follows: Ia Ib II III I ...
... tell not only the temperature of a star by its spectra, but also whether it was an average star (called mainsequence), a giant, or a white dwarf. Several classifications of stars were identified from the H-R diagram, called luminosity classes. They were given a designation as follows: Ia Ib II III I ...
Final review - Physics and Astronomy
... Denoted by lower-case letters, e.g., mV or mB • Absolute magnitude = apparent magnitude the star would have if placed at a standard distance (10 pc) from the Earth = dependent on luminosity only ...
... Denoted by lower-case letters, e.g., mV or mB • Absolute magnitude = apparent magnitude the star would have if placed at a standard distance (10 pc) from the Earth = dependent on luminosity only ...
April 1st
... • Not enough mass for fusion • Minimum mass of gas need for fusion is 0.08 solar masses (80 times the mass of Jupiter) ...
... • Not enough mass for fusion • Minimum mass of gas need for fusion is 0.08 solar masses (80 times the mass of Jupiter) ...
Astrophysics Presentation
... -- so if it looks dim it must be a very long way away A red star is not as bright, so if it looks bright it must be relatively close. For example: Sirius and Alpha Centauri are similar in apparent brightness but Sirius is bluish while A.Cent. is yellowish ...
... -- so if it looks dim it must be a very long way away A red star is not as bright, so if it looks bright it must be relatively close. For example: Sirius and Alpha Centauri are similar in apparent brightness but Sirius is bluish while A.Cent. is yellowish ...
Why are Binary Stars so Important for the Theory
... modern model-simulation method by Wood. The two independent methods give consistent results and the radii of the two components are determined better than 1 %. The surface gravities are then also known very precisely (2 %). The temperature difference is small and weil defined. 80th of the components ...
... modern model-simulation method by Wood. The two independent methods give consistent results and the radii of the two components are determined better than 1 %. The surface gravities are then also known very precisely (2 %). The temperature difference is small and weil defined. 80th of the components ...
Kepler`s Law - New Mexico Tech
... The Sun’s Lifecycle • The Sun was formed about 4.57 billion years ago when a hydrogen molecular cloud collapsed. • It is about halfway through its main-sequence evolution, during this time, nuclear fusion reactions in its core fuse hydrogen into helium. • It will spend approx. 10 billion years as a ...
... The Sun’s Lifecycle • The Sun was formed about 4.57 billion years ago when a hydrogen molecular cloud collapsed. • It is about halfway through its main-sequence evolution, during this time, nuclear fusion reactions in its core fuse hydrogen into helium. • It will spend approx. 10 billion years as a ...
Solar System from Web
... The Sun’s Lifecycle • The Sun was formed about 4.57 billion years ago when a hydrogen molecular cloud collapsed. • It is about halfway through its main-sequence evolution, during this time, nuclear fusion reactions in its core fuse hydrogen into helium. • It will spend approx. 10 billion years as a ...
... The Sun’s Lifecycle • The Sun was formed about 4.57 billion years ago when a hydrogen molecular cloud collapsed. • It is about halfway through its main-sequence evolution, during this time, nuclear fusion reactions in its core fuse hydrogen into helium. • It will spend approx. 10 billion years as a ...
SES4U ~ The Formation of Our Solar Systemstudentcopy
... • These grains will settle to the disk midplane since they are heavier than the H and He gas. What happens next is uncertain. – One possibility is that the thin disk of dust is gravitationally unstable, leading to the formation of roughly 1 kilometer size objects known as planetesimals. – Another po ...
... • These grains will settle to the disk midplane since they are heavier than the H and He gas. What happens next is uncertain. – One possibility is that the thin disk of dust is gravitationally unstable, leading to the formation of roughly 1 kilometer size objects known as planetesimals. – Another po ...
Chapter 13
... • Most luminous yellow giants on an H-R diagram are aging high-mass stars • Less luminous yellow giants are low-mass stars that have completed their first red giant stage • Regardless of mass, many yellow giants pulsate in size and luminosity ...
... • Most luminous yellow giants on an H-R diagram are aging high-mass stars • Less luminous yellow giants are low-mass stars that have completed their first red giant stage • Regardless of mass, many yellow giants pulsate in size and luminosity ...
REACH FOR THE STARS MLK 2009
... What causes a sun like star to suddenly contract in diameter? ___________________________________ How many times will a blue giant orbit the center of the Milky Way during its life? ________________ Where are globular clusters typically found in a galaxy? ___________________ Approximately what % of ...
... What causes a sun like star to suddenly contract in diameter? ___________________________________ How many times will a blue giant orbit the center of the Milky Way during its life? ________________ Where are globular clusters typically found in a galaxy? ___________________ Approximately what % of ...
File
... • The difference between luminosity and brightness • How we can measure radius using temperature • The magnitude system of star brightness • Stellar spectra and how it indicates surface temperature • Luminosity classes • How we estimate stellar masses • The H-R diagram for inferring a star’s size an ...
... • The difference between luminosity and brightness • How we can measure radius using temperature • The magnitude system of star brightness • Stellar spectra and how it indicates surface temperature • Luminosity classes • How we estimate stellar masses • The H-R diagram for inferring a star’s size an ...
New Braunfels Astronomy Club
... Near the end of April Comet 41P is heading into Lyra, then passes into Hercules in mid-May. Look for it just west, then southwest of Vega in the first week of May. As May progresses 41P moves into eastern Hercules, about 4-5° east-southeast of omicron (ο) Herculis (in his left hand). If we’re lucky, ...
... Near the end of April Comet 41P is heading into Lyra, then passes into Hercules in mid-May. Look for it just west, then southwest of Vega in the first week of May. As May progresses 41P moves into eastern Hercules, about 4-5° east-southeast of omicron (ο) Herculis (in his left hand). If we’re lucky, ...
Lesson 4 - Scientist in Residence Program
... 2. Have the students watch the first two sections of the Exploring Stars DVD – the first section is about the characteristics of stars and the second section reviews the lifecycle of a star. 3. Ask the students to write down on their video report sheet any new facts they might learn from the video, ...
... 2. Have the students watch the first two sections of the Exploring Stars DVD – the first section is about the characteristics of stars and the second section reviews the lifecycle of a star. 3. Ask the students to write down on their video report sheet any new facts they might learn from the video, ...
Lecture 9/10 Stellar evolution Ulf Torkelsson 1 Main sequence stars
... gains momentum and continues outward. The shock wave eventually reaches the stellar surface after a few hours, at which time the star appears as a supernova. Typically this will be a type II supernova, which is characterised by a spectrum with strong hydrogen lines. (There are also type I supernovae ...
... gains momentum and continues outward. The shock wave eventually reaches the stellar surface after a few hours, at which time the star appears as a supernova. Typically this will be a type II supernova, which is characterised by a spectrum with strong hydrogen lines. (There are also type I supernovae ...
Nov 2017 - What`s Out Tonight?
... well liked for its blue & gold colors. Ptolemaeus magnitude +11. The second closest star visible to Alphonsus the naked eye is Sirius at 8.6 ly followed by Epsilon Moon (e) Eridani at 10.5 ly and Procyon at 11.4 ly. There Tycho Starting from New Moon, the Moon cycles through are several stars closer ...
... well liked for its blue & gold colors. Ptolemaeus magnitude +11. The second closest star visible to Alphonsus the naked eye is Sirius at 8.6 ly followed by Epsilon Moon (e) Eridani at 10.5 ly and Procyon at 11.4 ly. There Tycho Starting from New Moon, the Moon cycles through are several stars closer ...
Astronomy 112: Physics of Stars Problem set 1 solutions 1
... we want to calculate the masses of the two stars, M1 and M2 . For simplicity we will assume that the orbit is circular, with semi-major axis a. The orbital plane of the binary is inclined at an unknown angle i relative to the plane of the sky, where i = 0 corresponds to an orbit that is perfectly fa ...
... we want to calculate the masses of the two stars, M1 and M2 . For simplicity we will assume that the orbit is circular, with semi-major axis a. The orbital plane of the binary is inclined at an unknown angle i relative to the plane of the sky, where i = 0 corresponds to an orbit that is perfectly fa ...
Stars
... amount of energy, but there are billions of reactions per second. Each second, the Sun produces 4 × 1026 joules of energy. It would take 2,000 million nuclear power plants a whole year to produce the same amount of energy on Earth. In the Sun, and in most stars, hydrogen atoms fuse together to form ...
... amount of energy, but there are billions of reactions per second. Each second, the Sun produces 4 × 1026 joules of energy. It would take 2,000 million nuclear power plants a whole year to produce the same amount of energy on Earth. In the Sun, and in most stars, hydrogen atoms fuse together to form ...
Stellar Evolution – Life of a Star
... Sun…a MAIN SEQUENCE STAR. It has been burning for about 4.5 billion years…and will continue to burn as such for another 4.5 billion years. • Most stars are Main Sequence Stars (recall the Hertizsprung-Russell Diagram) ...
... Sun…a MAIN SEQUENCE STAR. It has been burning for about 4.5 billion years…and will continue to burn as such for another 4.5 billion years. • Most stars are Main Sequence Stars (recall the Hertizsprung-Russell Diagram) ...
Lab 5: Searching for Extra-Solar Planets
... planetary systems were suspected to exist, none had been found. Now, thirteen years later, the search for planets around other stars, known as extra-solar planets or exoplanets, is one of the hot research areas in astronomy. As of June 2011, 560 extra-solar planets have been found in at least 369 pl ...
... planetary systems were suspected to exist, none had been found. Now, thirteen years later, the search for planets around other stars, known as extra-solar planets or exoplanets, is one of the hot research areas in astronomy. As of June 2011, 560 extra-solar planets have been found in at least 369 pl ...
ASTR-1020: Astronomy II Course Lecture Notes - Faculty
... (A0 V) will remain for 370 million years (Vega is relatively young), and an M0 V star will remain on the main sequence for 57 billion years! Since the Universe is about 12-14 billion years old, no M0 star has yet evolved off of the main sequence. ...
... (A0 V) will remain for 370 million years (Vega is relatively young), and an M0 V star will remain on the main sequence for 57 billion years! Since the Universe is about 12-14 billion years old, no M0 star has yet evolved off of the main sequence. ...
Lecture 15: The Main Sequence
... More massive main-sequence stars need higher pressures to support themselves against gravitational collapse. Higher pressure=higher temperatures. The higher temperatures lead to greater rates of nuclear fusion which means higher luminosity. ...
... More massive main-sequence stars need higher pressures to support themselves against gravitational collapse. Higher pressure=higher temperatures. The higher temperatures lead to greater rates of nuclear fusion which means higher luminosity. ...
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.