Extragalactic Astrophysics 1 AA 2011-2012 Prof. LA Antonelli
... subtracting solar motion, it is found that Milky Way and M31 approach each other at V~120 km/s most other galaxies have velocities within ~60 km/s from MilkyWay+M31 center of mass, not enough to escape from LG: Local Group represents a typical galactic environment: less dense than a galaxy cluster l ...
... subtracting solar motion, it is found that Milky Way and M31 approach each other at V~120 km/s most other galaxies have velocities within ~60 km/s from MilkyWay+M31 center of mass, not enough to escape from LG: Local Group represents a typical galactic environment: less dense than a galaxy cluster l ...
How Close is our Nearest Neighbor
... center of the Milky Way to its outer edge. Our Milky Way contains hundreds of billions of stars and is one of billions of galaxies in the universe. The universe is vast, and most of the universe is empty – no stars, no dust, no gas, no galaxies. Yet, our Milky Way is located in a group of about 35 g ...
... center of the Milky Way to its outer edge. Our Milky Way contains hundreds of billions of stars and is one of billions of galaxies in the universe. The universe is vast, and most of the universe is empty – no stars, no dust, no gas, no galaxies. Yet, our Milky Way is located in a group of about 35 g ...
Testing
... dec of +38°44’ puts it almost 39° north of celestial equator (negative dec would be south of equator) ...
... dec of +38°44’ puts it almost 39° north of celestial equator (negative dec would be south of equator) ...
Talk - Otterbein University
... • We now know how far away stars are, so we know how big they are, and we can understand how they work. • We understand how big our galaxy is (100,000 ly) and that some “nebulae” are galaxies like our own ...
... • We now know how far away stars are, so we know how big they are, and we can understand how they work. • We understand how big our galaxy is (100,000 ly) and that some “nebulae” are galaxies like our own ...
The double-degenerate, super-Chandrasekhar nucleus of the
... characteristic features such as rings and/or jets highlighted as being associated with central star binarity9. One of them, Henize 2–428 (PN G049.4+02.4), shows one of the shortest orbital periods found for this class of object. This bipolar nebula consists of two open lobes emerging from a ringshap ...
... characteristic features such as rings and/or jets highlighted as being associated with central star binarity9. One of them, Henize 2–428 (PN G049.4+02.4), shows one of the shortest orbital periods found for this class of object. This bipolar nebula consists of two open lobes emerging from a ringshap ...
Stellar Evolution
... Observing Stellar Evolution in Star Clusters The following series of H–R diagrams shows how stars of the same age, but different masses, appear as the cluster as a whole ages. After 10 million years, the most massive stars have already left the main sequence, while many of the least massive have no ...
... Observing Stellar Evolution in Star Clusters The following series of H–R diagrams shows how stars of the same age, but different masses, appear as the cluster as a whole ages. After 10 million years, the most massive stars have already left the main sequence, while many of the least massive have no ...
Evolution of a Star
... has evolved into a giant. If the star equals one solar mass, then it becomes a red giant. If the star equals 100 solar masses, then it will become a supergiant. In about 5 billion years, our sun will become a giant. Once the red giant’s core uses its supply of helium, it contracts even more. As the ...
... has evolved into a giant. If the star equals one solar mass, then it becomes a red giant. If the star equals 100 solar masses, then it will become a supergiant. In about 5 billion years, our sun will become a giant. Once the red giant’s core uses its supply of helium, it contracts even more. As the ...
Lesson Plan G2 The Stars
... good indicator of its distance. In Starry Night they will examine several different stars and they will see how some stars end their lives. ...
... good indicator of its distance. In Starry Night they will examine several different stars and they will see how some stars end their lives. ...
Document
... For stars like the sun, the oscillation period is 5 min → 1 min exposure time For good RV measurement you need S/N = 200 On a 2m telescope with a good spectrograph you can get S/N = 100 (10000 photons) in one hour on a V=10 star → 400.000 photons on a V=6 star in one hour, 6600 photons in one minute ...
... For stars like the sun, the oscillation period is 5 min → 1 min exposure time For good RV measurement you need S/N = 200 On a 2m telescope with a good spectrograph you can get S/N = 100 (10000 photons) in one hour on a V=10 star → 400.000 photons on a V=6 star in one hour, 6600 photons in one minute ...
Beers_First_Stars_NIC_School
... times the solar mass. No clear evidence of supernovae from such supermassive stars has, however, yet been found in the chemical compositions of Milky Way stars. Here we report on an analysis of a very metal-poor star, SDSS J001820.5−093939.2, which possesses elemental-abundance ratios that differ si ...
... times the solar mass. No clear evidence of supernovae from such supermassive stars has, however, yet been found in the chemical compositions of Milky Way stars. Here we report on an analysis of a very metal-poor star, SDSS J001820.5−093939.2, which possesses elemental-abundance ratios that differ si ...
Compa ring between Spectroscopic and Photometric Method for
... This is the most popular and accessible method in astronomy. Photometry is the measurement of the intensity of electromagnetic radiation usually expressed in apparent magnitude. Apparent magnitude is a numerical scale to describe how bright each star appears in the sky. The lower the magnitude, the ...
... This is the most popular and accessible method in astronomy. Photometry is the measurement of the intensity of electromagnetic radiation usually expressed in apparent magnitude. Apparent magnitude is a numerical scale to describe how bright each star appears in the sky. The lower the magnitude, the ...
Using the Southern Cross to find south
... on human daily life’. In contrast, astronomy is defined as: ‘The science of the celestial bodies, their motions, positions, distances, magnitudes, and other related information’. Signs of the zodiac In Ptolemy’s time, over 2000 years ago, the Sun, Moon and planets as viewed from Earth moved through ...
... on human daily life’. In contrast, astronomy is defined as: ‘The science of the celestial bodies, their motions, positions, distances, magnitudes, and other related information’. Signs of the zodiac In Ptolemy’s time, over 2000 years ago, the Sun, Moon and planets as viewed from Earth moved through ...
Herbig Ae/Be Stars
... A reliable understanding of pre-main sequence evolution would reveal many details of star formation • What is the star formation history? + How long does star formation last? + Which stars form first? + What is the relation between young stars in adjacent ...
... A reliable understanding of pre-main sequence evolution would reveal many details of star formation • What is the star formation history? + How long does star formation last? + Which stars form first? + What is the relation between young stars in adjacent ...
Document
... Galaxy, but for the vast majority, the separation of the stars is large enough that one star doesn’t affect the evolution of the other(s). ...
... Galaxy, but for the vast majority, the separation of the stars is large enough that one star doesn’t affect the evolution of the other(s). ...
Star Spectra - Renton School District
... A nebula is an enormous cloud of gas and dust in which stars are born. Most nebulae produce an emission spectrum, which is characterized by bright lines of color against a dark background. The bright lines in an emission spectrum correspond to the dark lines in an absorption spectrum. ...
... A nebula is an enormous cloud of gas and dust in which stars are born. Most nebulae produce an emission spectrum, which is characterized by bright lines of color against a dark background. The bright lines in an emission spectrum correspond to the dark lines in an absorption spectrum. ...
The Milky Way Galaxy is Heading for a Major Cosmic Collision
... showing flattened shape – (camera angle zoom-out) Andromeda and M33 heading towards Milky Way – (4 billion years) Direct Milky Way – Andromeda collision ...
... showing flattened shape – (camera angle zoom-out) Andromeda and M33 heading towards Milky Way – (4 billion years) Direct Milky Way – Andromeda collision ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.