JHK standard stars for large telescopes: the UKIRT Fundamental
... 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 detectors in normal operating modes on telescopes of up to 10-m aperture. Many are accessible ...
... 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 detectors in normal operating modes on telescopes of up to 10-m aperture. Many are accessible ...
the UKIRT Fundamental and Extended lists
... 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 detectors in normal operating modes on telescopes of up to 10-m aperture. Many are accessible ...
... 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 detectors in normal operating modes on telescopes of up to 10-m aperture. Many are accessible ...
Sample pages 1 PDF
... especially nearby, a mere 1,300 light years away. It is visible even to the naked eye, as a fuzzy patch halfway down the Sword of Orion asterism. A small telescope reveals its two brightest regions, the larger of which is M42 (NGC 1976) and the other M43 (NGC 1982). The Orion Molecular Cloud Complex ...
... especially nearby, a mere 1,300 light years away. It is visible even to the naked eye, as a fuzzy patch halfway down the Sword of Orion asterism. A small telescope reveals its two brightest regions, the larger of which is M42 (NGC 1976) and the other M43 (NGC 1982). The Orion Molecular Cloud Complex ...
ASTRONOMY 113 Laboratory Lab 5: Spectral Classification of the
... these clusters are bound to each other by gravity. Star clusters are also valuable laboratories for the study of stars, because within any given cluster all of the stars have the same age, composition, and distance. This permits us to study the relationships between fundamental stellar properties su ...
... these clusters are bound to each other by gravity. Star clusters are also valuable laboratories for the study of stars, because within any given cluster all of the stars have the same age, composition, and distance. This permits us to study the relationships between fundamental stellar properties su ...
CONSTELLATION PERSEUS The constellation
... the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west. Some star atlases during the early 19th century also depicted Perseus holding onto the head of the Medusa, whose asterism was named together as Perseus et Caput Medusae, however, this never came into popular usag ...
... the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west. Some star atlases during the early 19th century also depicted Perseus holding onto the head of the Medusa, whose asterism was named together as Perseus et Caput Medusae, however, this never came into popular usag ...
H-Band spectroscopic classification of OB stars
... Ohio State Infrared Imager and Spectrometer (OSIRIS) on the Perkins 1.8–m telescope of the Ohio Wesleyan and Ohio State Universities at the Lowell Observatory. The Perkins telescope is located on Anderson Mesa near Flagstaff, Arizona. OSIRIS is more fully described by DePoy et al. (1993). The target ...
... Ohio State Infrared Imager and Spectrometer (OSIRIS) on the Perkins 1.8–m telescope of the Ohio Wesleyan and Ohio State Universities at the Lowell Observatory. The Perkins telescope is located on Anderson Mesa near Flagstaff, Arizona. OSIRIS is more fully described by DePoy et al. (1993). The target ...
Entropy
... through the analysis of entropy and its production. There are almost no quantitative calculations of entropy and entropy production for astrophysical objects; rough estimates are applied in rare cases even for relatively well-studied objects, such as, for instance, stars [11-15]. However, it is obvi ...
... through the analysis of entropy and its production. There are almost no quantitative calculations of entropy and entropy production for astrophysical objects; rough estimates are applied in rare cases even for relatively well-studied objects, such as, for instance, stars [11-15]. However, it is obvi ...
15.1 Introduction
... Spectroscopically, WR stars are spectacular in appearance: their optical and UV spectra are dominated by strong, broad emission lines instead of the narrow absorption lines that are typical of ‘normal’ stars (Figure 15.3). The emission lines are so strong that they were first noticed as early as 186 ...
... Spectroscopically, WR stars are spectacular in appearance: their optical and UV spectra are dominated by strong, broad emission lines instead of the narrow absorption lines that are typical of ‘normal’ stars (Figure 15.3). The emission lines are so strong that they were first noticed as early as 186 ...
Small Wonders: Cygnus
... Three degrees almost directly east of Deneb, we come across one of the most photographed nebulae in the night sky. The North American Nebula is spectacular in long exposure photographs, and unlike many objects in the sky clearly resembles its namesake. Until recently tho, its been considered a chall ...
... Three degrees almost directly east of Deneb, we come across one of the most photographed nebulae in the night sky. The North American Nebula is spectacular in long exposure photographs, and unlike many objects in the sky clearly resembles its namesake. Until recently tho, its been considered a chall ...
Stellar Masses
... stably. Objects with masses slightly below this limit are called brown dwarfs, and are ‘star like’ in the sense that nuclear burning of deuterium occurs in their core. Below a mass of 0.015M⊙ (roughly 16 times the mass of Jupiter) not even deuterium burning can occur, and these objects are perhaps b ...
... stably. Objects with masses slightly below this limit are called brown dwarfs, and are ‘star like’ in the sense that nuclear burning of deuterium occurs in their core. Below a mass of 0.015M⊙ (roughly 16 times the mass of Jupiter) not even deuterium burning can occur, and these objects are perhaps b ...
Is Draco II one of the faintest dwarf galaxies? First study from Keck
... of stars 2 and 10, which must have very similar stellar parameters as they are confirmed Dra II member stars with almost identical colours and magnitudes ((0.53,18.87) and (0.55,18.98)), implies that these two member stars have significantly different metallicities (a 4.5σ difference in the equivale ...
... of stars 2 and 10, which must have very similar stellar parameters as they are confirmed Dra II member stars with almost identical colours and magnitudes ((0.53,18.87) and (0.55,18.98)), implies that these two member stars have significantly different metallicities (a 4.5σ difference in the equivale ...
Chapter 19 Stars Galaxies and the Universe
... things, stars go through a life cycle from birth to death. The actual life cycle of a star depends on its size. An average star, such as the sun, goes through four stages during its life. A star enters the first stage of its life cycle as a ball of gas and dust called a protostar. Gravity pulls the ...
... things, stars go through a life cycle from birth to death. The actual life cycle of a star depends on its size. An average star, such as the sun, goes through four stages during its life. A star enters the first stage of its life cycle as a ball of gas and dust called a protostar. Gravity pulls the ...
Absolute magnitudes and kinematics of barium
... analysed in order to assess a possible evolutionary link between the groups. We have used the kinematical results in order to estimate an average sample age for each group from the age-dispersion relationship given by Lacey (1992). The total velocity dispersions have been evaluated from the data of ...
... analysed in order to assess a possible evolutionary link between the groups. We have used the kinematical results in order to estimate an average sample age for each group from the age-dispersion relationship given by Lacey (1992). The total velocity dispersions have been evaluated from the data of ...
Entropy Production of Main-Sequence Stars
... to discuss of black holes, questions connected with the accelerated expansion of the Universe, to build and generalize gravitation theories, etc. (see, e.g., [6–10]). The majority of the papers, being strictly theoretical, place principal emphasis on functional relations between variables establishe ...
... to discuss of black holes, questions connected with the accelerated expansion of the Universe, to build and generalize gravitation theories, etc. (see, e.g., [6–10]). The majority of the papers, being strictly theoretical, place principal emphasis on functional relations between variables establishe ...
Nebula
... A planetary nebula is an astronomical object consisting of a glowing shell of gas and plasma formed by certain types of stars at the end of their lives. The name originates from a similarity in appearance to giant planets when viewed through a small optical telescope and is unrelated to planets of t ...
... A planetary nebula is an astronomical object consisting of a glowing shell of gas and plasma formed by certain types of stars at the end of their lives. The name originates from a similarity in appearance to giant planets when viewed through a small optical telescope and is unrelated to planets of t ...
Chapter 18 - Origin and Evolution of Stars Chapter Preview
... from a cloud of gas and dust, it is initially very large with a low temperature. As a result its rather large luminosity and low temperature place it in the upper right corner of the H-R diagram. As contraction continues the temperature of the "surface" of the protostar remains nearly constant while ...
... from a cloud of gas and dust, it is initially very large with a low temperature. As a result its rather large luminosity and low temperature place it in the upper right corner of the H-R diagram. As contraction continues the temperature of the "surface" of the protostar remains nearly constant while ...
Auriga (constellation)
Auriga is one of the 48 constellations listed by the 2nd-century astronomer Ptolemy and remains one of the 88 modern constellations. Located north of the celestial equator, its name is the Latin word for ""charioteer"", associating it with various mythological charioteers, including Erichthonius and Myrtilus. Auriga is most prominent during winter evenings in the Northern Hemisphere, along with the five other constellations that have stars in the Winter Hexagon asterism. Because of its northern declination, Auriga is only visible in its entirety as far as 34° south; for observers farther south it lies partially or fully below the horizon. A large constellation, with an area of 657 square degrees, it is half the size of the largest constellation, Hydra.Its brightest star, Capella, is an unusual multiple star system among the brightest stars in the night sky. Beta Aurigae is an interesting variable star in the constellation; Epsilon Aurigae, a nearby eclipsing binary with an unusually long period, has been studied intensively. Because of its position near the winter Milky Way, Auriga has many bright open clusters in its borders, including M36, M37, and M38, popular targets for amateur astronomers. In addition, it has one prominent nebula, the Flaming Star Nebula, associated with the variable star AE Aurigae.In Chinese mythology, Auriga's stars were incorporated into several constellations, including the celestial emperors' chariots, made up of the modern constellation's brightest stars. Auriga is home to the radiant for the Aurigids, Zeta Aurigids, Delta Aurigids, and the hypothesized Iota Aurigids.