Supernova Neutrinos
... for astronomers. SNEWS exists to alert astronomers of a nearby supernova. ...
... for astronomers. SNEWS exists to alert astronomers of a nearby supernova. ...
ph709-14
... transits, is used as well. Infrared. The light from the star will swamp that of the planet by a factor of 109 in the optical, so it seems that concentrating upon the infrared region would have the best chance of success. In the infrared, the difference in the emission strength between a star and a p ...
... transits, is used as well. Infrared. The light from the star will swamp that of the planet by a factor of 109 in the optical, so it seems that concentrating upon the infrared region would have the best chance of success. In the infrared, the difference in the emission strength between a star and a p ...
Astronomy in 1936 The History of the Universe
... Look at the images of the galaxies at the coordinates listed below. Write down your best guess at the Hubble class of each galaxy, with a brief description of the galaxy and of why you gave it whatever Hubble class you picked. ...
... Look at the images of the galaxies at the coordinates listed below. Write down your best guess at the Hubble class of each galaxy, with a brief description of the galaxy and of why you gave it whatever Hubble class you picked. ...
Tasks - ESA Science
... Observatories in Chile have presented ever deeper and more spectacular views of the Universe. However, Hubble and the ESO telescopes have not just provided stunning new images, they are also invaluable tools for astronomers. The telescopes have excellent spatial/angular resolution (image sharpness) ...
... Observatories in Chile have presented ever deeper and more spectacular views of the Universe. However, Hubble and the ESO telescopes have not just provided stunning new images, they are also invaluable tools for astronomers. The telescopes have excellent spatial/angular resolution (image sharpness) ...
Stars
... Life Track After Main Sequence • Observations of star clusters show that a star becomes larger, redder, and more luminous after its time on the main sequence is over. • At the end of their main sequence life time - when hydrogen in the core is exhausted - stars ascend the red giant branch. © 2007 P ...
... Life Track After Main Sequence • Observations of star clusters show that a star becomes larger, redder, and more luminous after its time on the main sequence is over. • At the end of their main sequence life time - when hydrogen in the core is exhausted - stars ascend the red giant branch. © 2007 P ...
Stories in the Stars
... Cluster. A group of objects close to each other; clusters of stars or galaxies. Star clusters are open or globular. Constellation. A pattern of stars that suggests the shape of some god, person, animal or object. Eclipse. Blocking of light from one body by another that passes in front of it. Eclipsi ...
... Cluster. A group of objects close to each other; clusters of stars or galaxies. Star clusters are open or globular. Constellation. A pattern of stars that suggests the shape of some god, person, animal or object. Eclipse. Blocking of light from one body by another that passes in front of it. Eclipsi ...
Energy transport in stellar interiors
... This formula has to be used with caution: it can give some insight in simplifying approaches but should not be used in serious applications. One omission is a correction factor for quantum-mechanical effects, the so-called Gaunt factor gff . Bound-free and bound-bound absorption Bound-free absorptio ...
... This formula has to be used with caution: it can give some insight in simplifying approaches but should not be used in serious applications. One omission is a correction factor for quantum-mechanical effects, the so-called Gaunt factor gff . Bound-free and bound-bound absorption Bound-free absorptio ...
Question 9: Starting from the ground state, press two and only two
... first six orbitals with the correct relative spacing. o The electron can absorb photons and jump higher energy levels where it will remain for a short time before emitting a photon(s) and drop to lower energy level (with known probabilities fixed by quantum mechanics). o The electron can also be ion ...
... first six orbitals with the correct relative spacing. o The electron can absorb photons and jump higher energy levels where it will remain for a short time before emitting a photon(s) and drop to lower energy level (with known probabilities fixed by quantum mechanics). o The electron can also be ion ...
Chapter 26.2 notes
... is much closer than other stars. The brightness of a star as it appears from Earth is called its apparent brightness. The apparent brightness of a star decreases as its distance from you increases. ...
... is much closer than other stars. The brightness of a star as it appears from Earth is called its apparent brightness. The apparent brightness of a star decreases as its distance from you increases. ...
Photoelectric Photometry of the Pleiades
... apparent magnitudes will be measured for each star, in each of three colors. We will assume all of these stars are approximately the same distance away. This is a necessary and reasonable assumption because all of the stars are members of the same cluster. If we did not make this general assumption, ...
... apparent magnitudes will be measured for each star, in each of three colors. We will assume all of these stars are approximately the same distance away. This is a necessary and reasonable assumption because all of the stars are members of the same cluster. If we did not make this general assumption, ...
3.2 Spectra and Spectral Classification
... Harvard Observatory College (1913): A. J. Cannon and her team of Ladies at Harvard working for years on the classification of steller spectra. In 1897 Cannon was hired by Pickering to classify the spectra of stars of the southern hemisphere. Cannon and her team classified stars at an average rate of ...
... Harvard Observatory College (1913): A. J. Cannon and her team of Ladies at Harvard working for years on the classification of steller spectra. In 1897 Cannon was hired by Pickering to classify the spectra of stars of the southern hemisphere. Cannon and her team classified stars at an average rate of ...
Chapter 7: The Galaxy, structure and content File
... and M31 (it does also contain one less massive spiral, M33, several irregular galaxies of modest mass, and numerous low mass dwarfs). We shall first consider the mass constraint that can be obtained from the dynamics of M31 and the Galaxy, ignoring the other Local Group galaxies. The observational i ...
... and M31 (it does also contain one less massive spiral, M33, several irregular galaxies of modest mass, and numerous low mass dwarfs). We shall first consider the mass constraint that can be obtained from the dynamics of M31 and the Galaxy, ignoring the other Local Group galaxies. The observational i ...
SGHS Faulkes ASISTM Star Cluster Photometry
... star. Stars in open clusters are young (typically less than a few 100 million years old) so their stars are relatively small and there are many stars that are giving off a lot of energy. This means there are many stars that appear blue. Stars in globular clusters on the other hand are old (typically ...
... star. Stars in open clusters are young (typically less than a few 100 million years old) so their stars are relatively small and there are many stars that are giving off a lot of energy. This means there are many stars that appear blue. Stars in globular clusters on the other hand are old (typically ...
Grzegorz Nowak, Andrzej Niedzielski, Aleksander Wolszczan, Pawe
... The main objective of the PTPS is detection of planets around GK subgiants and giants through precision radial velocity (RV) measurements with iodine absorption cell using HET HRS spectrograph. However, the long period RV variations of red giants may also have other than planetary nature (e.g. a non ...
... The main objective of the PTPS is detection of planets around GK subgiants and giants through precision radial velocity (RV) measurements with iodine absorption cell using HET HRS spectrograph. However, the long period RV variations of red giants may also have other than planetary nature (e.g. a non ...
ASTR-100 - Jiri Brezina Teaching
... Looking ‘down’ on the Earth’s North Pole, both its axial rotation and revolution (orbiting) are counterclockwise (ccw). This is termed direct rotation, while the word retrograde is applied to the rotation opposite to the revolution. Objects with retrograde rotation have inclination to orbit greater ...
... Looking ‘down’ on the Earth’s North Pole, both its axial rotation and revolution (orbiting) are counterclockwise (ccw). This is termed direct rotation, while the word retrograde is applied to the rotation opposite to the revolution. Objects with retrograde rotation have inclination to orbit greater ...
key - Scioly.org
... 3) What is the escape speed (in km/s) and surface gravity (relative to Earth gravities) of Sirius B? (use the following data for Sirius B; 1.1 solar mass, and 0.008 solar radii). Answer in “km/s” (for escape speed), and “Earth gravities” to three significant digits please. Answer: M= 1.1 solar masse ...
... 3) What is the escape speed (in km/s) and surface gravity (relative to Earth gravities) of Sirius B? (use the following data for Sirius B; 1.1 solar mass, and 0.008 solar radii). Answer in “km/s” (for escape speed), and “Earth gravities” to three significant digits please. Answer: M= 1.1 solar masse ...
Astrophysical parameters of ten poorly studied open star clusters
... with the 2MASS J, H and Ks filters (Bonatto et al. 2004; Bica et al. 2006) to derive the cluster parameters. The simultaneous fittings were attempted on the J ∼ (J − H) and Ks ∼ (J − Ks ) diagrams for the inner stars, which should be less contaminated by the background field. If the number of stars ...
... with the 2MASS J, H and Ks filters (Bonatto et al. 2004; Bica et al. 2006) to derive the cluster parameters. The simultaneous fittings were attempted on the J ∼ (J − H) and Ks ∼ (J − Ks ) diagrams for the inner stars, which should be less contaminated by the background field. If the number of stars ...
Photometry – I. “All sky”
... cut from the same piece of glass, you cannot guarantee that they will be identical. After a few years, you might not even be able to get the same glass that was used previously. Detectors are also not really uniform; CCDs are much more red-sensitive than photomultipliers and different types (of eith ...
... cut from the same piece of glass, you cannot guarantee that they will be identical. After a few years, you might not even be able to get the same glass that was used previously. Detectors are also not really uniform; CCDs are much more red-sensitive than photomultipliers and different types (of eith ...
A historical perspective on the discovery of neutron stars
... that: nuclear forces considerably stiffen the EoS the maximum mass of neutron stars Mmax ≃ 2M⊙ is much higher than that found by Oppenheimer and Volkoff neutron stars can thus be formed as proposed by Baade and Zwicky neutron star cores may contain various nuclear species such as hyperons. Formed in ...
... that: nuclear forces considerably stiffen the EoS the maximum mass of neutron stars Mmax ≃ 2M⊙ is much higher than that found by Oppenheimer and Volkoff neutron stars can thus be formed as proposed by Baade and Zwicky neutron star cores may contain various nuclear species such as hyperons. Formed in ...
IK Pegasi
IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus. It is just luminous enough to be seen with the unaided eye, at a distance of about 150 light years from the Solar System.The primary (IK Pegasi A) is an A-type main-sequence star that displays minor pulsations in luminosity. It is categorized as a Delta Scuti variable star and it has a periodic cycle of luminosity variation that repeats itself about 22.9 times per day. Its companion (IK Pegasi B) is a massive white dwarf—a star that has evolved past the main sequence and is no longer generating energy through nuclear fusion. They orbit each other every 21.7 days with an average separation of about 31 million kilometres, or 19 million miles, or 0.21 astronomical units (AU). This is smaller than the orbit of Mercury around the Sun.IK Pegasi B is the nearest known supernova progenitor candidate. When the primary begins to evolve into a red giant, it is expected to grow to a radius where the white dwarf can accrete matter from the expanded gaseous envelope. When the white dwarf approaches the Chandrasekhar limit of 1.44 solar masses (M☉), it may explode as a Type Ia supernova.