1 Introduction - University of Amsterdam
... explosion and therefore also the nature of the compact object that is left behind. It is not only mass that governs the evolution of massive stars, the initial chemical composition and rotation velocity also play an instrumental role. Stars are mainly composed of the primordial elements hydrogen and ...
... explosion and therefore also the nature of the compact object that is left behind. It is not only mass that governs the evolution of massive stars, the initial chemical composition and rotation velocity also play an instrumental role. Stars are mainly composed of the primordial elements hydrogen and ...
Ardua et Astra: On the Calculation of the Dates of the Rising and
... encourages us to drink at the rising of Sirius; and Horace assures us that a man content with his lot is not disturbed at the setting of Arcturus or the rising of Haedus.1 Indeed, Quintilian suggests that a knowledge of the stars is necessary to understand poetry, because poets so often specify the ...
... encourages us to drink at the rising of Sirius; and Horace assures us that a man content with his lot is not disturbed at the setting of Arcturus or the rising of Haedus.1 Indeed, Quintilian suggests that a knowledge of the stars is necessary to understand poetry, because poets so often specify the ...
3D Tour of the Universe Template
... regions, resulting in the formation of new young stars. As is common in these kinds of encounters, spiral structure was induced in the more massive galaxy. M51 is an easily found astronomical showpiece if the sky is dark, where suggestions of its spiral arms may be visible. As is also common with th ...
... regions, resulting in the formation of new young stars. As is common in these kinds of encounters, spiral structure was induced in the more massive galaxy. M51 is an easily found astronomical showpiece if the sky is dark, where suggestions of its spiral arms may be visible. As is also common with th ...
The Star Zodiac of Antiquity
... Lu.hung.ga, the Sumerian equivalent of Aries.5 Some half a dozen of these constellations had the same names as today (the Crab, Balance, Bull, Lion, Scorpion and Goat-fish), though the images may have differed. For example, ‘The Mesopotamian Bull-of-Heaven shared with our Taurus the cluster Hyades a ...
... Lu.hung.ga, the Sumerian equivalent of Aries.5 Some half a dozen of these constellations had the same names as today (the Crab, Balance, Bull, Lion, Scorpion and Goat-fish), though the images may have differed. For example, ‘The Mesopotamian Bull-of-Heaven shared with our Taurus the cluster Hyades a ...
instructor notes: weeks 9/10
... Lenticular galaxies get their name because they are “lenslike,” but are more like spiral and barred spiral galaxies in possessing a flattened disk, rather than like elliptical galaxies which mostly possess an ellipsoidal symmetry. The distinguishing feature of lenticulars relative to spiral galaxie ...
... Lenticular galaxies get their name because they are “lenslike,” but are more like spiral and barred spiral galaxies in possessing a flattened disk, rather than like elliptical galaxies which mostly possess an ellipsoidal symmetry. The distinguishing feature of lenticulars relative to spiral galaxie ...
Star Formation in Bok Globules - European Southern Observatory
... star when it fulfils the following four conditions: (1) The star is associated with nebulosity and dark clouds, (2) Ha is seen in emission in its spectrum, (3) The star is weakly variable in an irregular manner, (4) The flux distribution of the star shows an infrared excess. All these criteria are f ...
... star when it fulfils the following four conditions: (1) The star is associated with nebulosity and dark clouds, (2) Ha is seen in emission in its spectrum, (3) The star is weakly variable in an irregular manner, (4) The flux distribution of the star shows an infrared excess. All these criteria are f ...
Lecture21 - Michigan State University
... Sagittarius-Carina, Perseus, Cygnus arms We are located in a sub-arm called the Orion arm There is a fourth, unnamed arm difficult to observe ...
... Sagittarius-Carina, Perseus, Cygnus arms We are located in a sub-arm called the Orion arm There is a fourth, unnamed arm difficult to observe ...
Open clusters in the Third Galactic Quadrant III. Alleged binary
... content may become evident in some clusters from the reddening estimation. Therefore, we applied the same metal content set of isochronous lines (Girardi et al. 2000) until the best MS match is achieved in the CMD. The method is exemplified with the cluster Haffner 10 (see Sect. 4.1.1) where a simult ...
... content may become evident in some clusters from the reddening estimation. Therefore, we applied the same metal content set of isochronous lines (Girardi et al. 2000) until the best MS match is achieved in the CMD. The method is exemplified with the cluster Haffner 10 (see Sect. 4.1.1) where a simult ...
19_Testbank - Lick Observatory
... of stars ever born, arising out of the primordial mix of elements that came from the Big Bang. The oldest stars we know about are over 12-15 billion years old—a star made of only helium and hydrogen would have to be at least this old. (No such star has ever been discovered.) 2) Nebulae that scatter ...
... of stars ever born, arising out of the primordial mix of elements that came from the Big Bang. The oldest stars we know about are over 12-15 billion years old—a star made of only helium and hydrogen would have to be at least this old. (No such star has ever been discovered.) 2) Nebulae that scatter ...
Document
... • If you can see both stars in the spectrum, then you may be able to use Doppler shifts to measure the radial velocities of both stars. This gives you the mass ratio, regardless of the viewing angle (e.g. nearly face-on, nearly edgeon, etc.). This is usually useful information. • If you can find the ...
... • If you can see both stars in the spectrum, then you may be able to use Doppler shifts to measure the radial velocities of both stars. This gives you the mass ratio, regardless of the viewing angle (e.g. nearly face-on, nearly edgeon, etc.). This is usually useful information. • If you can find the ...
Precision age indicators that exploit chemically peculiar stars
... Tracing stellar population age by integrated light is a mainstay of galaxy evolution interpretation. Somewhat ambiguously, yet still of great value, blue photometric colors generally indicate galaxies with ongoing star formation, while red colors indicate galaxies that have not formed significant nu ...
... Tracing stellar population age by integrated light is a mainstay of galaxy evolution interpretation. Somewhat ambiguously, yet still of great value, blue photometric colors generally indicate galaxies with ongoing star formation, while red colors indicate galaxies that have not formed significant nu ...
15_Testbank
... A) The magnitude system that we use now is based on a system used by the ancient Greeks over 2,000 years ago that classified stars by how bright they appeared. B) A star with apparent magnitude 1 is brighter than one with apparent magnitude 2. C) The absolute magnitude of a star is another measure o ...
... A) The magnitude system that we use now is based on a system used by the ancient Greeks over 2,000 years ago that classified stars by how bright they appeared. B) A star with apparent magnitude 1 is brighter than one with apparent magnitude 2. C) The absolute magnitude of a star is another measure o ...
MESSIER - EarthLink
... On September 7, he originally discovers his first deepsky object: The Saturn Nebula (NGC 7009). ...
... On September 7, he originally discovers his first deepsky object: The Saturn Nebula (NGC 7009). ...
the UKIRT Fundamental and Extended lists
... of 82 standard stars, 28 from the widely used preliminary list known as the ‘UKIRT Faint Standards’, referred to here as the Fundamental List, and 54 additional stars referred to as the Extended List. The stars have 9:4 , K , 15:0 and all or most should be readily observable with imaging array detec ...
... of 82 standard stars, 28 from the widely used preliminary list known as the ‘UKIRT Faint Standards’, referred to here as the Fundamental List, and 54 additional stars referred to as the Extended List. The stars have 9:4 , K , 15:0 and all or most should be readily observable with imaging array detec ...
JHK standard stars for large telescopes: the UKIRT Fundamental
... of 82 standard stars, 28 from the widely used preliminary list known as the ‘UKIRT Faint Standards’, referred to here as the Fundamental List, and 54 additional stars referred to as the Extended List. The stars have 9:4 , K , 15:0 and all or most should be readily observable with imaging array detec ...
... of 82 standard stars, 28 from the widely used preliminary list known as the ‘UKIRT Faint Standards’, referred to here as the Fundamental List, and 54 additional stars referred to as the Extended List. The stars have 9:4 , K , 15:0 and all or most should be readily observable with imaging array detec ...
Document
... They merely reflect the starlight toward us without emitting visible radiation of their own. ...
... They merely reflect the starlight toward us without emitting visible radiation of their own. ...
Galaxies - University of Iowa Astrophysics
... Why are Cepheid variable stars useful in determining distances? A) They all have the same distance. B) Their luminosity can be determined from their pulsation period. C) They all have the same luminosity. D) They all have the same radius. ...
... Why are Cepheid variable stars useful in determining distances? A) They all have the same distance. B) Their luminosity can be determined from their pulsation period. C) They all have the same luminosity. D) They all have the same radius. ...
Lecture 12: Evolution of the Galaxy
... momentum. This results in (a) an accretion disk around equator (b) strong bipolar magnetic field and hence mass loss in bipolar outflow through poles (observed through strong millimetre wave emission in lines of CO) • Typical mass loss rate of protostar ~ 10-4 to 10-6 M⊙/yr • Protostars are often en ...
... momentum. This results in (a) an accretion disk around equator (b) strong bipolar magnetic field and hence mass loss in bipolar outflow through poles (observed through strong millimetre wave emission in lines of CO) • Typical mass loss rate of protostar ~ 10-4 to 10-6 M⊙/yr • Protostars are often en ...
PowerPoint Presentation - 16. Properties of Stars
... • The key is that all stars were not born at the same time. • the stars which we see today are at different stages in their lives • we observe only a brief moment in any one star’s life • by studying large numbers of stars, we get a “snapshot” of one moment in the history of the stellar community • ...
... • The key is that all stars were not born at the same time. • the stars which we see today are at different stages in their lives • we observe only a brief moment in any one star’s life • by studying large numbers of stars, we get a “snapshot” of one moment in the history of the stellar community • ...
July - Antelope Valley Astronomy Club
... 13 arc seconds. Mars is due south - and so highest in the Venus sky - at ~9:30 on the first of July, and even though its ...
... 13 arc seconds. Mars is due south - and so highest in the Venus sky - at ~9:30 on the first of July, and even though its ...
Cepheid
... In Shapley’s day, the LMC and SMC were considered as two isolated offshoots of the Milky Way, different from the spiral nebulae. We now realize that they are ‘dwarf’ galaxies in their own right (but not spirals). ...
... In Shapley’s day, the LMC and SMC were considered as two isolated offshoots of the Milky Way, different from the spiral nebulae. We now realize that they are ‘dwarf’ galaxies in their own right (but not spirals). ...
normal and active - FirstLight Astro
... 1. Many galaxies were discovered in the 1700’s by a man whose name is still associated with many of them. Who was he? 2. Which type of galaxy can be spherical to flat? 3. Which type can be loosely wound to tightly wound? 4. Which type is filled with older stars and little gas? 5. Which type has star ...
... 1. Many galaxies were discovered in the 1700’s by a man whose name is still associated with many of them. Who was he? 2. Which type of galaxy can be spherical to flat? 3. Which type can be loosely wound to tightly wound? 4. Which type is filled with older stars and little gas? 5. Which type has star ...
Distance determination for RAVE stars using stellar models
... Figure 1 shows log(L/L ) versus log(Tef f ) and is called the HerzsprungRussel (HR) Diagram. This diagram is comparable to plots of absolute magnitude (e.g. MV ) versus colour (e.g. B − V ), since effective temperature and colour are correlated, and the luminosity is related to the magnitude. A dia ...
... Figure 1 shows log(L/L ) versus log(Tef f ) and is called the HerzsprungRussel (HR) Diagram. This diagram is comparable to plots of absolute magnitude (e.g. MV ) versus colour (e.g. B − V ), since effective temperature and colour are correlated, and the luminosity is related to the magnitude. A dia ...
Quiz 2 Lecture 12
... Which of the following statements is FALSE? a. Ring galaxies can be produced by head-on collisions between galaxies. b. The ratio of the number of elliptical to spiral galaxies remains constant over time. c. The Magellanic Clouds may eventually be "cannibalized" by our Galaxy. d. The shape of a gala ...
... Which of the following statements is FALSE? a. Ring galaxies can be produced by head-on collisions between galaxies. b. The ratio of the number of elliptical to spiral galaxies remains constant over time. c. The Magellanic Clouds may eventually be "cannibalized" by our Galaxy. d. The shape of a gala ...
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.