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WHAT MAKES A STAR SO SPECIAL Abstract
WHAT MAKES A STAR SO SPECIAL Abstract

... diagram has two almost horizontal sequences of stars with high luminosity called Giants and Super-Giants. At the bottom end of the diagram there is an area with a small number of stars that are very hot but with low luminosity – this is the area of White Dwarfs. Stars from the bottom part of the mai ...
Constellation Guide Book
Constellation Guide Book

... passed at vernal equinox. While the vernal equinox has since moved into the constellation Pisces, it's still sometimes called the "First Point of Aries."  Symbolic significance: In ancient Greek culture, the horn (such as the one on a ram) was a symbol for renewal, which Aries once ushered in durin ...
Astronomy Astrophysics NGC 7419 as a template for red supergiant clusters &
Astronomy Astrophysics NGC 7419 as a template for red supergiant clusters &

... Context. The open cluster NGC 7419 is known to contain five red supergiants and a very high number of Be stars. However, there are conflicting reports about its age and distance that prevent a useful comparison with other clusters. Aims. We intend to obtain more accurate parameters for NGC 7419, usi ...
Ardua et Astra: On the Calculation of the Dates of the Rising and
Ardua et Astra: On the Calculation of the Dates of the Rising and

... north pole, the stars would appear to rotate in horizontal planes parallel to the horizon, never rising or setting. As we move south and our latitude decreases, the north celestial pole appears to move down in the sky, until when we reach the equator it appears to be in the same horizontal plane as ...
Main-Sequence Stars and the Sun
Main-Sequence Stars and the Sun

... relation to the surface temperature of the star is as follows. Hydrogen Balmer lines. Absorption lines caused by hydrogen atoms that are initially in the first excited state (see Chapter 1) are referred to as Balmer lines. At low surface temperatures, most of the hydrogen atoms are in the ground sta ...
Part IV: Stars
Part IV: Stars

... interior, photons can only travel a fraction of a millimeter before “colliding” with an electron and deflecting into a new direction. So photons bounce around at random and only slowly make their way out of the Sun. Mathematical models use the observed composition and mass of the Sun, along with the ...
Polaris
Polaris

... nearly still in our sky while the entire northern sky moves around it. That’s because it’s located nearly at the north celestial pole, the point around which the entire northern sky turns. Polaris marks the way due north. As you face Polaris and stretch your arms sideways, your right hand points due ...
The Pleiades in the Salle des Taureaux", Grotte de Lascaux
The Pleiades in the Salle des Taureaux", Grotte de Lascaux

... or sixteen (KRUPP, 1991: 246-247). Many traditions speak emphatically of six stars: the Chinese (KRUPP, 1991: 245), the Indian (SCHLEBERGER, 1986: 136) the Japanese (Ainu; KRUPP, 1991: 245), the Amerindians (Natives of North America, for example the Cherokee, Chumash, Navajo, Tachi Yokut, Yurok [HUD ...
CONSTELLATION PERSEUS The constellation
CONSTELLATION PERSEUS The constellation

... • Beta Persei known as Algol (from the Arabic Ra's al-Ghul, which means The Demon's Head), is the best-known star in Perseus. Representing the eye of the Gorgon Medusa in Greek mythology, it was called Horus in Egyptian mythology and Rosh ha Satan ("Satan's Head") in Hebrew. Located 92.8 light-years ...
A very massive runaway star from Cygnus OB2⋆
A very massive runaway star from Cygnus OB2⋆

... v∗ is the spatial velocity of the star. The distance given in Eq. (5) assumes that the bow shock is bound by shock fronts on both sides. In reality, the non-zero cooling time of the shocked stellar wind builds up a thick layer of low-density, high-temperature gas between the reverse shock on the ste ...
StellarManual
StellarManual

... An incomplete sentence is presented that indicates the size and surface temperature a certain star has relative to the Sun. Students should determine how the stellar luminosity will compare with the Sun. Initially there is no equation displayed. Answer: Luminosity of a star is proportional to the sq ...
THE HELIACAL RISE OF SIRIUS- Algorithm
THE HELIACAL RISE OF SIRIUS- Algorithm

... The atmospheric extinction for a given place shows how many star-magnitudes are extinguished by one earth atmosphere. In the best case, in a dry mountain desert, the extinction will be around 0.10. In the worse case, around some sea coasts, it may reach 0.40 and even 0.50. There are some scholars wh ...
Small star patterns for telescopes and binoculars Demelza Ramakers
Small star patterns for telescopes and binoculars Demelza Ramakers

... chevron. It’s located just above the galaxy NGC 2217 in Canis Major, a bit right of the back paw. The asterism is pretty big, and the stars in the chevron have a magnitude of 7 to 10, which makes this a beautiful binocular object. Through telescopes you will see the color of the stars (yellow-orange ...
16. Magnitude Systems
16. Magnitude Systems

... • The official (online) SDSS magnitudes are stored in a unit called luptitudes or asinh magnitudes • This unit was designed to improve magnitudes for very faint objects (for very low signal-to-noise measurements) • In this system, m = -(2.5/ln10)[asinh((f/f0)/2b) +ln(b)] instead of m = -2.5log10(f/f ...
Cassiopeia Kelly Pearce
Cassiopeia Kelly Pearce

... within the boundary of the constellation. These observable objects include both New General Catalogue objects and Messier objects. New General Catalogue is a catalogue of recorded deep sky objects and is referred to as NGC (SEDS, The Messier Catalog, 2010). The first of these objects, NGC 457, is al ...
Chapter 12: Stars and Galaxies
Chapter 12: Stars and Galaxies

... based on luminosity and temperature. Two of these star groupings lie above the main sequence line. The group closest to the main sequence has large-diameter stars with lower temperatures. They are called red giants. The stars in the group at the top of an H-R diagram are very large and have varying ...
Searching for RR Lyrae Stars in M15
Searching for RR Lyrae Stars in M15

... in the atmosphere of the star. Typically, RRab stars exhibit cooler surface temperatures than RRc stars and are actually more common. While 91 percent of known RR Lyrae stars are of type RRab, only 9 percent are of the type RRc [5]. RRab stars are classified into one group rather than RRa and RRb be ...
Getting an image of Sirius B
Getting an image of Sirius B

... Sirius B is these days about 10 arc seconds apart from Sirius A [1,2]. Both stars have apparent magnitudes of 8.3 and -1.47 respectively [3]. During visual observations, Sirius B gets confused within the glare of Sirius A. Typically, when you attempt to see it by taking pictures, it either gets loca ...
A physical interpretation of the `red Sirius` anomaly
A physical interpretation of the `red Sirius` anomaly

... telluric extinction vector is capable of displacing Sirius into a domain of the diagram where it has values of colour and brightness very similar to those of the comparison stars. An airmass of X ˆ 12:5 is needed to redden Sirius to …B 2 V† ˆ 1:5, and its visual magnitude is then dimmed only to V ˆ ...
Andromeda: Daughter of Cassiopeia Ἀνδρομέδη Kaitlyn Heaton
Andromeda: Daughter of Cassiopeia Ἀνδρομέδη Kaitlyn Heaton

... To find the Andromeda Constellation, you must be able to find Pegasus first. That's because Andromeda's face is actually Pegasus's bellybutton (assuming horses have a bellybutton). Andromeda looks like a curvy triangle hanging off the corner of the Great Square (which forms Pegasus's body). This is ...
File
File

... This unusual long arm shows lots of young blue star clusters. But NGC 772 also possesses many weak, tightly coiled arms which, although well formed, are relatively smooth, indicating only a small current rate of star formation. The relatively smooth multiple arms on the opposite side from the promin ...
Lecture 14
Lecture 14

... • Stars have different colors? So is the amount of light at different wavelengths the same? • Can we tell the difference between a very luminous star that is far away and an intrinsically low luminosity star that is nearby? ASTR111 Lecture 14 ...
Chapter 16--Properties of Stars
Chapter 16--Properties of Stars

... mysterious points of light in the sky. We now know that all stars form in great clouds of gas and dust. Each star begins its life with roughly the same chemical composition: About three-quarters of the star’s mass at birth is hydrogen, and about one-quarter is helium, with no more than about 2% cons ...
Here - Astrophysics Research Institute
Here - Astrophysics Research Institute

... All the objects considered so far have been "fixed stars", which keep almost constant values of Right Ascension and Declination. But bodies within the Solar System move a lot within the equatorial coordinate system. The most important one to consider is the Sun. The Sun's declination can be found by ...


... 3. THE RR LYRAE STARS IN M15 In Clement’s (2002) data base of variables stars, a total of 158 variable stars are known, from which approximately 104 are RR Lyrae type stars. In this work, 33 known RR Lyrae stars, identified in Figs. 1 and 2 and listed in Table 4, have been studied. For all the stars ...
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Canis Major

Canis Major /ˌkeɪnɨs ˈmeɪdʒər/ is a constellation in the southern celestial hemisphere. In the second century, it was included in Ptolemy's 48 constellations, and is counted among the 88 modern constellations. Its name is Latin for ""greater dog"" in contrast to Canis Minor, the ""lesser dog""; both figures are commonly represented as following the constellation of Orion the hunter through the sky. The Milky Way passes through Canis Major and several open clusters lie within its borders, most notably M41.Canis Major contains Sirius, the brightest star in the night sky, known as the ""dog star"". It is bright because of its proximity to our Solar System. In contrast, the other bright stars of the constellation are stars of great distance and high luminosity. At magnitude 1.5, Epsilon Canis Majoris (Adhara) is the second brightest star of the constellation and the brightest source of extreme ultraviolet radiation in the night sky. Next in brightness are the yellow-white supergiant Delta (Wezen) at 1.8, the blue-white giant Beta (Mirzam) at 2.0, blue-white supergiants Eta (Aludra) at 2.4 and Omicron1 at 3.0, and white spectroscopic binary Zeta (Furud), also at 3.0. The red hypergiant VY Canis Majoris is one of the largest stars known, while the neutron star RX J0720.4-3125 has a radius of a mere 5 km.
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