ASTRO-114--Lecture 38-
... and look up at the stars. And after a little practice, they could pick a star and tell what its magnitude was. Because you only had six numbers to choose from and usually you could tell whether it was first, ‘cause they were very bright, or whether it was sixth, because you could hardly see them, an ...
... and look up at the stars. And after a little practice, they could pick a star and tell what its magnitude was. Because you only had six numbers to choose from and usually you could tell whether it was first, ‘cause they were very bright, or whether it was sixth, because you could hardly see them, an ...
Planetary rulers are not simple affinities
... Hermes Half-Hour a misnomer…) It’s a matter of historical record that Jyotisha or Indian Astrology was heavily influenced by Greek astrology in the first centuries of the Common Era - thus, a path for the transmission of this particular doctrine from Greece to India is definitely suggested. The Ind ...
... Hermes Half-Hour a misnomer…) It’s a matter of historical record that Jyotisha or Indian Astrology was heavily influenced by Greek astrology in the first centuries of the Common Era - thus, a path for the transmission of this particular doctrine from Greece to India is definitely suggested. The Ind ...
Hertzsprung-Russell Diagram Outline
... 16631 single stars from the Hipparcos Catalogue with relative distance precision better than 10% and sigma_(B-V) less than or equal to 0.025 mag. Colors indicate number of stars in a cell of 0.01 mag in (B-V) and 0.05 mag in V magnitude ...
... 16631 single stars from the Hipparcos Catalogue with relative distance precision better than 10% and sigma_(B-V) less than or equal to 0.025 mag. Colors indicate number of stars in a cell of 0.01 mag in (B-V) and 0.05 mag in V magnitude ...
Chapter 25 - Haiku Learning
... he star Proxima Centauri is about 100 million times farther away from Earth than the moon. Yet, besides the sun, it is the closest star to Earth. The universe is incomprehensibly large. What is the nature of this vast universe? Do stars move, or do they remain in one place? Does the universe extend ...
... he star Proxima Centauri is about 100 million times farther away from Earth than the moon. Yet, besides the sun, it is the closest star to Earth. The universe is incomprehensibly large. What is the nature of this vast universe? Do stars move, or do they remain in one place? Does the universe extend ...
Document
... The Universe is filled with these star systems which themselves cluster together into larger systems. ...
... The Universe is filled with these star systems which themselves cluster together into larger systems. ...
Galaxies
... The Universe is filled with these star systems which themselves cluster together into larger systems. ...
... The Universe is filled with these star systems which themselves cluster together into larger systems. ...
- Cosmotography
... dwarfs have been identified observationally (Stinson et al. 2009), but it is not clear if these stars were accreted, or formed in-situ. Star formation in dwarfs is thought to occur in stochastic episodes (Tolstoy et al. 2009; Weisz et al. 2011), which could be triggered by accretion events. An iconi ...
... dwarfs have been identified observationally (Stinson et al. 2009), but it is not clear if these stars were accreted, or formed in-situ. Star formation in dwarfs is thought to occur in stochastic episodes (Tolstoy et al. 2009; Weisz et al. 2011), which could be triggered by accretion events. An iconi ...
Document
... - Estimated 1M years old - Most stars clouded from view by dust - Only 4-5 stars visible with small scope ...
... - Estimated 1M years old - Most stars clouded from view by dust - Only 4-5 stars visible with small scope ...
Neutron Stars and Black Holes
... Cepheid variable stars are located in two different galaxies, A and B. Both stars have the same average apparent brightness. The star in galaxy A has a bright-dim-bright period of 10 days, while the one in galaxy B has a bright-dim-bright period of 30 days. Which of the two galaxies is at a greater ...
... Cepheid variable stars are located in two different galaxies, A and B. Both stars have the same average apparent brightness. The star in galaxy A has a bright-dim-bright period of 10 days, while the one in galaxy B has a bright-dim-bright period of 30 days. Which of the two galaxies is at a greater ...
What is a standard candle?
... Cepheid variable stars are located in two different galaxies, A and B. Both stars have the same average apparent brightness. The star in galaxy A has a bright-dim-bright period of 10 days, while the one in galaxy B has a bright-dim-bright period of 30 days. Which of the two galaxies is at a greater ...
... Cepheid variable stars are located in two different galaxies, A and B. Both stars have the same average apparent brightness. The star in galaxy A has a bright-dim-bright period of 10 days, while the one in galaxy B has a bright-dim-bright period of 30 days. Which of the two galaxies is at a greater ...
100 Binocular Deep Sky Objects
... look? My answer to those questions is, You can look at nearly everything, but sometimes you just need a different way to look at things. This Binocular Observing List has many Deep Sky Objects, all listed in groups, sometimes 3 or 4 in a group, but usually 2 objects in a group. Seeing DSOs in groups ...
... look? My answer to those questions is, You can look at nearly everything, but sometimes you just need a different way to look at things. This Binocular Observing List has many Deep Sky Objects, all listed in groups, sometimes 3 or 4 in a group, but usually 2 objects in a group. Seeing DSOs in groups ...
Chapter 27 Quasars, Active Galaxies, and Gamma
... from stars, nebulae, and some galaxies. • There were also point-like, or star-like, radio sources which varied rapidly these are the `quasi-stellar’ radio sources or quasars. • In visible light quasars appear as points, like stars. ...
... from stars, nebulae, and some galaxies. • There were also point-like, or star-like, radio sources which varied rapidly these are the `quasi-stellar’ radio sources or quasars. • In visible light quasars appear as points, like stars. ...
THE HERTZSPRUNG-RUSSELL DIAGRAM
... The age of a cluster is given by the main sequence turn-off point—the highest point on the main sequence that is still populated by stars. On the left is a wellknown schematic diagram combining the HR diagrams of star clusters of different ages: NGC2362 is the youngest and M67 the oldest. The pink n ...
... The age of a cluster is given by the main sequence turn-off point—the highest point on the main sequence that is still populated by stars. On the left is a wellknown schematic diagram combining the HR diagrams of star clusters of different ages: NGC2362 is the youngest and M67 the oldest. The pink n ...
Galaxies and the Universe bb
... The universe looks about the same no matter where you are within it. ...
... The universe looks about the same no matter where you are within it. ...
An analogy
... – distant galaxies are younger than those used to define the Hubble Sequence – more peculiar galaxies are observed: could be due to patchy star formation (younger age) or to interactions being more frequent (denser Universe) – resolution is poor compared to local galaxies and usually limited to a fe ...
... – distant galaxies are younger than those used to define the Hubble Sequence – more peculiar galaxies are observed: could be due to patchy star formation (younger age) or to interactions being more frequent (denser Universe) – resolution is poor compared to local galaxies and usually limited to a fe ...
Introduction
... Fig. 1.1 compares images of two well-known elliptical galaxies. These galaxies have similar apparent luminosities and angular sizes; one is a little more elongated than the other, but otherwise there seems not much difference between them. Fig. 1.2, a comparison taking relative distance into account ...
... Fig. 1.1 compares images of two well-known elliptical galaxies. These galaxies have similar apparent luminosities and angular sizes; one is a little more elongated than the other, but otherwise there seems not much difference between them. Fig. 1.2, a comparison taking relative distance into account ...
Arcturus - bYTEBoss
... When he was grown up, Arcas met with the she-bear and, since obviously he didn't recognize her as his mother, he began to chase Callisto. Callisto, followed by Arcas, sheltered herself in a temple, a sacred place whose profaners were convicted to death. To avoid such fate, Zeus decided to set them i ...
... When he was grown up, Arcas met with the she-bear and, since obviously he didn't recognize her as his mother, he began to chase Callisto. Callisto, followed by Arcas, sheltered herself in a temple, a sacred place whose profaners were convicted to death. To avoid such fate, Zeus decided to set them i ...
Small galaxies are growing smaller
... have the spectacular appearance we see in “coffee table” books. Indeed, in the early days of extragalactic astronomy it was thought that most galaxies were of rather similar (large) luminosities. Specifically, Edwin Hubble (1936) and his contemporaries believed that the luminosity function (LF) of g ...
... have the spectacular appearance we see in “coffee table” books. Indeed, in the early days of extragalactic astronomy it was thought that most galaxies were of rather similar (large) luminosities. Specifically, Edwin Hubble (1936) and his contemporaries believed that the luminosity function (LF) of g ...
Abundances of RGB stars in NGC 6752 Grundahl
... abundance variations are of “primordial” origin. The primordial scenario, and variations on it, has been proposed and discussed several times before in the literature (see for example Cottrell & Da Costa 1981, and Cannon et al. 1998). The small star–to–star scatter in the iron peak elements (as obse ...
... abundance variations are of “primordial” origin. The primordial scenario, and variations on it, has been proposed and discussed several times before in the literature (see for example Cottrell & Da Costa 1981, and Cannon et al. 1998). The small star–to–star scatter in the iron peak elements (as obse ...
Challenging our Understanding of Stellar Structure and Evolution
... level of mass precision, luminosities are uncertain by 12 to 22%. This luminosity uncertainty means, for example, that radii would be very poorly determined, rendering them far less useful as checks of stellar models. At the 1% level of mass precision the variation in luminosity is now only 2 to 4%. ...
... level of mass precision, luminosities are uncertain by 12 to 22%. This luminosity uncertainty means, for example, that radii would be very poorly determined, rendering them far less useful as checks of stellar models. At the 1% level of mass precision the variation in luminosity is now only 2 to 4%. ...
Setting Instruction
... • The constellation display includes the positions of 452 fixed stars with a brightness of the 4.0th magnitude or brighter, 119 major nebulae and star clusters, delimitation of constellations, and the ecliptic and the celestial equator based on their positions for the year 2000.0. (Maximum magnitude ...
... • The constellation display includes the positions of 452 fixed stars with a brightness of the 4.0th magnitude or brighter, 119 major nebulae and star clusters, delimitation of constellations, and the ecliptic and the celestial equator based on their positions for the year 2000.0. (Maximum magnitude ...
Star Clusters and their stars
... They typically have 105 – 106 stars. They are spherically distributed around the center of our Galaxy. They tend to concentrate towards the center of the Galaxy, with many in the constellations Sagittarius, Scorpio and Ophiunchus It was by studying the distribution of globular clusters that astronom ...
... They typically have 105 – 106 stars. They are spherically distributed around the center of our Galaxy. They tend to concentrate towards the center of the Galaxy, with many in the constellations Sagittarius, Scorpio and Ophiunchus It was by studying the distribution of globular clusters that astronom ...
Aries (constellation)
Aries is one of the constellations of the zodiac. It is located in the northern celestial hemisphere between Pisces to the west and Taurus to the east. The name Aries is Latin for ram, and its symbol is 20px (Unicode ♈), representing a ram's horns. It is one of the 48 constellations described by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. It is a mid-sized constellation, ranking 39th overall size, with an area of 441 square degrees (1.1% of the celestial sphere).Although Aries came to represent specifically the ram whose fleece became the Golden Fleece of Ancient Greek mythology, it has represented a ram since late Babylonian times. Before that, the stars of Aries formed a farmhand. Different cultures have incorporated the stars of Aries into different constellations including twin inspectors in China and a porpoise in the Marshall Islands. Aries is a relatively dim constellation, possessing only four bright stars: Hamal (Alpha Arietis, second magnitude), Sheratan (Beta Arietis, third magnitude), Mesarthim (Gamma Arietis, fourth magnitude), and 41 Arietis (also fourth magnitude). The few deep-sky objects within the constellation are quite faint and include several pairs of interacting galaxies. Several meteor showers appear to radiate from Aries, including the Daytime Arietids and the Epsilon Arietids.