Chapter 09
... star A. What does this tell you about the masses of these two stars? a. The total mass of these two stars is four solar masses. b. The total mass of these two stars is five solar masses. c. The ratio of star A's mass to star B's mass is four to one. d. The ratio of star B's mass to star A's mass is ...
... star A. What does this tell you about the masses of these two stars? a. The total mass of these two stars is four solar masses. b. The total mass of these two stars is five solar masses. c. The ratio of star A's mass to star B's mass is four to one. d. The ratio of star B's mass to star A's mass is ...
The hawaiian star compass and the unit circle
... Nainoa positions the waʻa (canoe) centrally within the compass with the outer circular formation representing the horizon (Thompson, 2005). The right half (the eastern side) of the circle denotes stars’ rising points on the horizon, while the left half (the western side) depicts their setting points ...
... Nainoa positions the waʻa (canoe) centrally within the compass with the outer circular formation representing the horizon (Thompson, 2005). The right half (the eastern side) of the circle denotes stars’ rising points on the horizon, while the left half (the western side) depicts their setting points ...
Summary: Star Formation Near and Far
... What about the possibility of continuing fragmentation? In principle, one could imagine that a collapsing clump might fragment hierarchically into smaller and smaller objects until fragmentation is stopped by the increase of opacity at a mass less than 0.01 solar masses. However, this clearly is not ...
... What about the possibility of continuing fragmentation? In principle, one could imagine that a collapsing clump might fragment hierarchically into smaller and smaller objects until fragmentation is stopped by the increase of opacity at a mass less than 0.01 solar masses. However, this clearly is not ...
Chapter 11
... understand the life stories of the stars in this chapter and those that follow. In this chapter, we use the laws of physics in a new way. We develop theories and models based on physics that help us understand how stars work. For instance, what stops a contracting star and gives it stability? We can ...
... understand the life stories of the stars in this chapter and those that follow. In this chapter, we use the laws of physics in a new way. We develop theories and models based on physics that help us understand how stars work. For instance, what stops a contracting star and gives it stability? We can ...
How do the most massive galaxies constrain theories of
... o But default models do not produce enough massive red galaxies, especially at high redshift, because of continuous low level star formation. need a new process that quenches star ...
... o But default models do not produce enough massive red galaxies, especially at high redshift, because of continuous low level star formation. need a new process that quenches star ...
Progenitor and environment of the peculiar red nova V838 Mon
... years the system’s brightness was constant. After the outburst, we see photometric indications of a close approach and a collision of two components: first, brightening due to appearance of emission-line spectrum, then, an eclipse of B star observed for 70 days. ...
... years the system’s brightness was constant. After the outburst, we see photometric indications of a close approach and a collision of two components: first, brightening due to appearance of emission-line spectrum, then, an eclipse of B star observed for 70 days. ...
www.aavso.org
... Greek astronomer Hipparchus (c. 190 BC – c. 120 BC) He ranked stars into 6 classes of magnitude. The 20 brightest stars were assigned magnitude 1. Slightly dimmer stars were assigned magnitude 2. And so on, up to the faintest stars just visible with the naked eye, which were assigned magnitude 6. We ...
... Greek astronomer Hipparchus (c. 190 BC – c. 120 BC) He ranked stars into 6 classes of magnitude. The 20 brightest stars were assigned magnitude 1. Slightly dimmer stars were assigned magnitude 2. And so on, up to the faintest stars just visible with the naked eye, which were assigned magnitude 6. We ...
Into the sub-mm
... points of emission at the tips of the fingers. Although it is too early to say conclusively what the emission signifies, it is possibile that these mark the earliest phase of star formation. Modelling of the chemistry and dynamics of the finger-tip condensations has begun. The final presentation of ...
... points of emission at the tips of the fingers. Although it is too early to say conclusively what the emission signifies, it is possibile that these mark the earliest phase of star formation. Modelling of the chemistry and dynamics of the finger-tip condensations has begun. The final presentation of ...
Star Basics
... Norman Pogson proposed a quantitative scale of stellar magnitudes, which was adopted by the astronomical community. Each increment in magnitude corresponds to an increase in the amount of energy by 2.512, approximately. A fifth magnitude star is 2.512 times as bright as a sixth, and a fourth magnitu ...
... Norman Pogson proposed a quantitative scale of stellar magnitudes, which was adopted by the astronomical community. Each increment in magnitude corresponds to an increase in the amount of energy by 2.512, approximately. A fifth magnitude star is 2.512 times as bright as a sixth, and a fourth magnitu ...
EF Eri: Its White Dwarf Primary and L Dwarf Secondary
... EF Eri - Summary • EF Eri has just recovered from a nine year low state - the longest known for any polar. • Secondary star line emission started ~7 years in, 1.5 years before new high state. • RV solution yields secondary star mass = 0.055 Msun (fairly insensitive to M1) • Emission lines not irrad ...
... EF Eri - Summary • EF Eri has just recovered from a nine year low state - the longest known for any polar. • Secondary star line emission started ~7 years in, 1.5 years before new high state. • RV solution yields secondary star mass = 0.055 Msun (fairly insensitive to M1) • Emission lines not irrad ...
Lecture
... – O star: ~ 1 million years – G star (Sun): ~ 10 billion years – M star : ~ 5,000 billion years ...
... – O star: ~ 1 million years – G star (Sun): ~ 10 billion years – M star : ~ 5,000 billion years ...
New Double Stars from Asteroidal Occultations, 1971 - 2008
... Asteroids and planetary moons will naturally occult many stars as they move through the sky. The biggest challenge in observing such occultations is to accurately predict the time of the occultation event and the location of the shadow path as it crosses the Earth. Since the Hipparcos mission, and t ...
... Asteroids and planetary moons will naturally occult many stars as they move through the sky. The biggest challenge in observing such occultations is to accurately predict the time of the occultation event and the location of the shadow path as it crosses the Earth. Since the Hipparcos mission, and t ...
Eyeing the retina nebula
... Planetary nebulae are the multicolored remnants of dead stars. When a star about the size of the Sun runs out of nuclear fuel, the core collapses to form a much smaller dwarf star and the outer layers are ejected to form an expanding cloud of dust and gas. Intense radiation from the collapsed star i ...
... Planetary nebulae are the multicolored remnants of dead stars. When a star about the size of the Sun runs out of nuclear fuel, the core collapses to form a much smaller dwarf star and the outer layers are ejected to form an expanding cloud of dust and gas. Intense radiation from the collapsed star i ...
Answers to Coursebook questions – Chapter E3
... See discussion on page 506 in Physics for the IB Diploma. The method fails for stars far away (more than about 300 pc or 1000 ly) because then the parallax angle is too small to be measured accurately. ...
... See discussion on page 506 in Physics for the IB Diploma. The method fails for stars far away (more than about 300 pc or 1000 ly) because then the parallax angle is too small to be measured accurately. ...
Ch12&13 Life and Death of Stars
... You’ll have two shells burning around the core -- a H shell and a He shell, but no more fusion in the core. Again, the shells do nothing for the core, but they poof out the star even larger than before. It is at this point that probably our Sun will engulf Earth! ...
... You’ll have two shells burning around the core -- a H shell and a He shell, but no more fusion in the core. Again, the shells do nothing for the core, but they poof out the star even larger than before. It is at this point that probably our Sun will engulf Earth! ...
Spectroscopic parallax
... The Luminosity of a star can be found using an absorption spectrum. Using its spectrum a star can be placed in a spectral class. Also the star’s surface temperature can determined from its spectrum (Wien’s law) Using the H-R diagram and knowing both temperature and spectral class of the star, it ...
... The Luminosity of a star can be found using an absorption spectrum. Using its spectrum a star can be placed in a spectral class. Also the star’s surface temperature can determined from its spectrum (Wien’s law) Using the H-R diagram and knowing both temperature and spectral class of the star, it ...
Star names and magnitudes
... From the very earliest times, humans have grouped patterns of stars into constellations, often animals and characters from myths and legends. There are now 88 official constellations. ...
... From the very earliest times, humans have grouped patterns of stars into constellations, often animals and characters from myths and legends. There are now 88 official constellations. ...
Star of Bethlehem
In Christian tradition, the Star of Bethlehem, also called the Christmas Star, revealed the birth of Jesus to the Biblical Magi, and later led them to Bethlehem. The star appears only in the nativity story of the Gospel of Matthew, where astrologers from the east are inspired by the star to travel to Jerusalem. There they meet King Herod of Judea, and ask where the king of the Jews had been born. Herod, following a verse from the Book of Micah interpreted as a prophecy, directs them to Bethlehem, to the south of Jerusalem. The star leads them to Jesus' home in the town, where they worship him and give him gifts. The wise men are then given a divine warning not to return to Herod so they return home by a different route.Many Christians see the star as a miraculous sign to mark the birth of the Christ (or messiah). Some theologians claimed that the star fulfilled a prophecy, known as the Star Prophecy. Astronomers have made several attempts to link the star to unusual astronomical events, such as a conjunction of Jupiter and Saturn, a comet or a supernova.Many modern scholars do not consider the story to be describing a historical event but a pious fiction created by the author of the Gospel of Matthew.The subject is a favorite at planetarium shows during the Christmas season, although the Biblical account describes Jesus with a broader Greek word, which can mean either ""infant"" or ""child"" (paidon), rather than the more specific word for infant (brephos), possibly implying that some time has passed since the birth. The visit is traditionally celebrated on Epiphany (January 6) in Western Christianity.