Test #4
... 1. The location of the center of the Galaxy is determined by observations of: a) Cepheids variables, b) Globular clusters, c) The spiral arms, d) A visually bright, massive, object around which all objects in the Galaxy move. 2. What two observations of an object allow for a determination of the Mil ...
... 1. The location of the center of the Galaxy is determined by observations of: a) Cepheids variables, b) Globular clusters, c) The spiral arms, d) A visually bright, massive, object around which all objects in the Galaxy move. 2. What two observations of an object allow for a determination of the Mil ...
N (North) Equator Latitude and Declination
... First, some definitions. The observer’s zenith is the point directly over the observer’s head. The observer’s meridian is an imaginary arc in the sky which runs north-south (so passes over the poles) and through the observer’s zenith. The meridian lies directly over the observer’s great circle of lo ...
... First, some definitions. The observer’s zenith is the point directly over the observer’s head. The observer’s meridian is an imaginary arc in the sky which runs north-south (so passes over the poles) and through the observer’s zenith. The meridian lies directly over the observer’s great circle of lo ...
Description of Pictures In the Dome
... Centaurus A (also known as NGC 5128) is a lenticular galaxy about 11 million light-years away in the constellation Centaurus. It is one of the closest radio galaxies to Earth, so its active galactic nucleus has been extensively studied by professional astronomers. The galaxy is also the fifth bright ...
... Centaurus A (also known as NGC 5128) is a lenticular galaxy about 11 million light-years away in the constellation Centaurus. It is one of the closest radio galaxies to Earth, so its active galactic nucleus has been extensively studied by professional astronomers. The galaxy is also the fifth bright ...
Presentation
... Prialnik, Dina (2000). An Introduction to the Theory of Stellar Structure and Evolution. Cambridge University Press. Stahler, S. W. & Palla, F. (2004). The Formation of Stars. Weinheim: Wiley-VCH. ...
... Prialnik, Dina (2000). An Introduction to the Theory of Stellar Structure and Evolution. Cambridge University Press. Stahler, S. W. & Palla, F. (2004). The Formation of Stars. Weinheim: Wiley-VCH. ...
Masers and high mass star formation Claire Chandler
... If you know flux density, dust temperature, distance to source, and opacity characteristics of dust, you can get Md. Assume dust to gas ratio and you get total mass of object. ...
... If you know flux density, dust temperature, distance to source, and opacity characteristics of dust, you can get Md. Assume dust to gas ratio and you get total mass of object. ...
Star - Astrophysics
... These are moderate mass stars (e.g. Sirius’ companion Sirius B with M = 1.05M), but with very high temperatures ( ~30000 K) and very low luminosities (~3 x 10−3L) – hence their position in the H-R diagram. These values imply radii ~7 x 10−3R ~5000km and therefore a density 3 x 109kg m−3. They are ...
... These are moderate mass stars (e.g. Sirius’ companion Sirius B with M = 1.05M), but with very high temperatures ( ~30000 K) and very low luminosities (~3 x 10−3L) – hence their position in the H-R diagram. These values imply radii ~7 x 10−3R ~5000km and therefore a density 3 x 109kg m−3. They are ...
White Dwarfs
... some observed properties of type Ia and type II supernovae? a. Type Ia supernovae have hydrogen lines in their spectra. b. Type II supernovae have hydrogen lines in their spectra. c. Type Ia supernovae are more luminous. d. Both a and c above. e. Both b and c above. ...
... some observed properties of type Ia and type II supernovae? a. Type Ia supernovae have hydrogen lines in their spectra. b. Type II supernovae have hydrogen lines in their spectra. c. Type Ia supernovae are more luminous. d. Both a and c above. e. Both b and c above. ...
The Basics of the Universe
... but it is not compared to the other planets. Its day is 58 Earthdays, but it actually seems to take 176 Earth days instead of 58 because of its orbit! Venus: This planet was named for the Roman Goddess of Love and Beauty, but it is anything but lovely. Temperatures soar to 900o F. This is because it ...
... but it is not compared to the other planets. Its day is 58 Earthdays, but it actually seems to take 176 Earth days instead of 58 because of its orbit! Venus: This planet was named for the Roman Goddess of Love and Beauty, but it is anything but lovely. Temperatures soar to 900o F. This is because it ...
Stars I - Astronomy Centre
... Seminar Quiz (Stars III) • Why, apart from the Sun, can we only measure reliable masses for stars in binary systems? • Sirius, the brightest star in the sky, has a parallax of 0.379 arcseconds. What is its distance in parsecs? In light years? • Sirius is 22 times more luminous than the Sun; Polaris ...
... Seminar Quiz (Stars III) • Why, apart from the Sun, can we only measure reliable masses for stars in binary systems? • Sirius, the brightest star in the sky, has a parallax of 0.379 arcseconds. What is its distance in parsecs? In light years? • Sirius is 22 times more luminous than the Sun; Polaris ...
CHAPTER 30: STARS, GALAXIES AND THE UNIVERSE Analyzing
... Stars such as our sun are considered medium-sized stars. The sun has a diameter of 1,390,000 km. Most of the stars you can see in the night sky are medium-sized stars. Many stars also have about the same mass as the sun, however some stars may be more or less massive. Stellar Motion Apparent Motion ...
... Stars such as our sun are considered medium-sized stars. The sun has a diameter of 1,390,000 km. Most of the stars you can see in the night sky are medium-sized stars. Many stars also have about the same mass as the sun, however some stars may be more or less massive. Stellar Motion Apparent Motion ...
The Stars of Namaqualand
... The star Rigel, which belongs to Orion, is blue-white because of its high temperature and 57000 times brighter than our sun. In spite of the distant of 540 light years from the Earth, it shines as the seventh brightest star in our night sky. The astronomers believe, that Rigel is the most luminous s ...
... The star Rigel, which belongs to Orion, is blue-white because of its high temperature and 57000 times brighter than our sun. In spite of the distant of 540 light years from the Earth, it shines as the seventh brightest star in our night sky. The astronomers believe, that Rigel is the most luminous s ...
TAP 704- 8: The ladder of astronomical distances
... Brighter galaxies spin faster Beyond the distance where individual stars could be seen in galaxies, the only hope was to make further dangerous assumptions, for example that galaxies of the same type are equally bright, or equal in size. Neither method is helped by the fact that galaxies are seen at ...
... Brighter galaxies spin faster Beyond the distance where individual stars could be seen in galaxies, the only hope was to make further dangerous assumptions, for example that galaxies of the same type are equally bright, or equal in size. Neither method is helped by the fact that galaxies are seen at ...
Wavelength
... Other stars are so much farther away that it is convenient to express the distance to them in units of the distance traveled by light in one year. This unit is called a light year. The next closest star to us is Proxima Centauri. This star is 4.3 light years away which means that light from it takes ...
... Other stars are so much farther away that it is convenient to express the distance to them in units of the distance traveled by light in one year. This unit is called a light year. The next closest star to us is Proxima Centauri. This star is 4.3 light years away which means that light from it takes ...
PPTX
... During the day, the Sun moves from east to west across the sky. In which direction do the stars move after the Sun has set? (A) The stars are stationary; they don't move (B) West (C) East ...
... During the day, the Sun moves from east to west across the sky. In which direction do the stars move after the Sun has set? (A) The stars are stationary; they don't move (B) West (C) East ...
Earth in the Universe Answer each in your binder or notebook. Date
... A. A small group of stars is called a galaxy. B. Stars consist mainly of hydrogen and helium. C. Types of stars include red giants, super giants, and dwarf stars. D. Constellations of stars are found in different places in the sky. ...
... A. A small group of stars is called a galaxy. B. Stars consist mainly of hydrogen and helium. C. Types of stars include red giants, super giants, and dwarf stars. D. Constellations of stars are found in different places in the sky. ...
The Pistol Star - Emmi
... Milky way galaxy. • It was discovered by the Hubble Space telescope in the early 1900s. • It is 10 million times more brighter than the Sun. • The Pistol Star is 4 million years old. ...
... Milky way galaxy. • It was discovered by the Hubble Space telescope in the early 1900s. • It is 10 million times more brighter than the Sun. • The Pistol Star is 4 million years old. ...
Solutions
... by the newly formed OB Association stars that emit most of their energy as high-energy short-wavelength hardUV photons. The photons from the OB Association stars “power up” the HII region and keep it fluorescing. Thus the OB Association forms first and then the HII region is created around the vicin ...
... by the newly formed OB Association stars that emit most of their energy as high-energy short-wavelength hardUV photons. The photons from the OB Association stars “power up” the HII region and keep it fluorescing. Thus the OB Association forms first and then the HII region is created around the vicin ...
Today`s Powerpoint
... Remember, takes energetic UV photons to ionize H. Hot, massive stars produce huge amounts of these. Such short-lived stars spend all their lives in the stellar nursery of their birth, so emission nebulae mark sites of ongoing star formation. Many stars of lower mass are forming too, but make few UV ...
... Remember, takes energetic UV photons to ionize H. Hot, massive stars produce huge amounts of these. Such short-lived stars spend all their lives in the stellar nursery of their birth, so emission nebulae mark sites of ongoing star formation. Many stars of lower mass are forming too, but make few UV ...
Stars are classified by their TEMPERATURE (color) SPECTRAL
... Notice that LUMINOSITY does not have a DISTANCE unit. LUMINOSITY is INTRINSIC to the star, just as is its mass. ...
... Notice that LUMINOSITY does not have a DISTANCE unit. LUMINOSITY is INTRINSIC to the star, just as is its mass. ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.