CASPEC Observations of the Most Metal-Deficient Main
... give a list of 12 Galactic stars of this type with known distances. If we place these stars in the SMC, their V magnitudes will range from 17 to 22. The brightest one, HD 200775, assumed to lie at 440 pc from the Sun (Whitcomb et al., 1981), may be fainter than 17 if its distance is overestimated. T ...
... give a list of 12 Galactic stars of this type with known distances. If we place these stars in the SMC, their V magnitudes will range from 17 to 22. The brightest one, HD 200775, assumed to lie at 440 pc from the Sun (Whitcomb et al., 1981), may be fainter than 17 if its distance is overestimated. T ...
26.4 Groups of Stars
... When Giovanni Riccioli used a telescope like this one to observe a star in the handle of the Big Dipper, he discovered two stars that orbit each other. ...
... When Giovanni Riccioli used a telescope like this one to observe a star in the handle of the Big Dipper, he discovered two stars that orbit each other. ...
The Milky Way Galaxy
... • Many astronomers believe the Milky Way is moving at approximately 600 km per second relative to the observed locations of other nearby galaxies. • The recent estimates range from 130 km/s to 1,000 km/s. ...
... • Many astronomers believe the Milky Way is moving at approximately 600 km per second relative to the observed locations of other nearby galaxies. • The recent estimates range from 130 km/s to 1,000 km/s. ...
Astrophysics - Part 2
... Classification by luminosity Relation between brightness and apparent magnitude. Apparent magnitude, m Relation between intensity and apparent magnitude. Measurement of m from photographic plates and distinction between photographic and visual magnitude not required. Absolute magnitude, M Parsec and ...
... Classification by luminosity Relation between brightness and apparent magnitude. Apparent magnitude, m Relation between intensity and apparent magnitude. Measurement of m from photographic plates and distinction between photographic and visual magnitude not required. Absolute magnitude, M Parsec and ...
Sky Watcher - Boise Astronomical Society
... It’s the 960th anniversary of the Crab Nebula supernova on July 4th. A supernova explosion marks the end of the life of a massive star. The explosion occurs because the star has no internal source of energy strong enough to support its massive weight. Without that support, the star’s core collapses ...
... It’s the 960th anniversary of the Crab Nebula supernova on July 4th. A supernova explosion marks the end of the life of a massive star. The explosion occurs because the star has no internal source of energy strong enough to support its massive weight. Without that support, the star’s core collapses ...
Binary Star Systems - d_smith.lhseducators.com
... • In a telescope, an optical double looks like a binary star system, 2 stars that are in orbit around a common center of mass. • However, they’re really far apart from each other. They just happen to be in the same part of the sky. • Mizar and Alcor are an optical double pair. ...
... • In a telescope, an optical double looks like a binary star system, 2 stars that are in orbit around a common center of mass. • However, they’re really far apart from each other. They just happen to be in the same part of the sky. • Mizar and Alcor are an optical double pair. ...
Stars: some basic characteristics
... lines is that they are very hot. There is so much thermal energy in their atmospheres that most of the elements become ionized; if the electrons aren’t attached to nuclei, then they can’t transition between energy levels and so they can’t ...
... lines is that they are very hot. There is so much thermal energy in their atmospheres that most of the elements become ionized; if the electrons aren’t attached to nuclei, then they can’t transition between energy levels and so they can’t ...
Spectroscopy – the study of the colors of light (the spectrum) given
... The abundance of Hydrogen is actually similar for all stars, the different intensities of H-lines from one star to another is due to differences in temperature causing different levels of ionization. ...
... The abundance of Hydrogen is actually similar for all stars, the different intensities of H-lines from one star to another is due to differences in temperature causing different levels of ionization. ...
Pulsating Variable Stars and The Hertzsprung - Chandra X
... luminosities. Luminosity (L) is related to the absolute magnitude (MV) of a star, and is the total amount of energy radiated per second (luminosity is proportional to T4). Two stars with similar effective temperatures but greatly different luminosities must differ in size. They belong to different l ...
... luminosities. Luminosity (L) is related to the absolute magnitude (MV) of a star, and is the total amount of energy radiated per second (luminosity is proportional to T4). Two stars with similar effective temperatures but greatly different luminosities must differ in size. They belong to different l ...
CCD BVRI and 2MASS Photometry of the Poorly Studied Open
... e.g. distance, age, and interstellar extinction; can be determined by comparing color-magnitude (CM) and color-color (CC) diagrams with the modern theoretical models. As we know, more than half of the currently catalogued open clusters (∼ 2000 OCs) have been poorly studied or even unstudied at all. ...
... e.g. distance, age, and interstellar extinction; can be determined by comparing color-magnitude (CM) and color-color (CC) diagrams with the modern theoretical models. As we know, more than half of the currently catalogued open clusters (∼ 2000 OCs) have been poorly studied or even unstudied at all. ...
lecture25
... Radar ranging - good for measuring distances in the solar system (up to about 0.0001 light years) Parallax - good for measuring distances to a few hundred light years ...
... Radar ranging - good for measuring distances in the solar system (up to about 0.0001 light years) Parallax - good for measuring distances to a few hundred light years ...
Plotting Variable Stars on the H
... magnitude (MV) values, one at maximum and one at minimum. They also have enough variation to change spectral classes. To show the entire cycle of change for variable stars, it is necessary to plot them twice – at maxima and minima. The spectral class column gives the spectral class at both maximum ( ...
... magnitude (MV) values, one at maximum and one at minimum. They also have enough variation to change spectral classes. To show the entire cycle of change for variable stars, it is necessary to plot them twice – at maxima and minima. The spectral class column gives the spectral class at both maximum ( ...
Lecture 4: Telescopes Web site Stuff from last time Naked eye and magnitudes
... for "seeing faraway things as though nearby." Most practical applications were maritime use; spotting ships or land from far off. ...
... for "seeing faraway things as though nearby." Most practical applications were maritime use; spotting ships or land from far off. ...
Slide 1 - Personal.psu.edu
... Summary of Chapter 19 (cont.) • The protostar continues to collapse; when the core is dense and hot enough, fusion begins • The star continues to collapse until the inward force of gravity is balanced by the outward pressure from the core. The star is now on the Main Sequence • More massive stars f ...
... Summary of Chapter 19 (cont.) • The protostar continues to collapse; when the core is dense and hot enough, fusion begins • The star continues to collapse until the inward force of gravity is balanced by the outward pressure from the core. The star is now on the Main Sequence • More massive stars f ...
norfolk skies - Norfolk Astronomical Society
... for his gentle, warm manner and for always having a good cup of fresh brewed coffee and snacks available at all the AST events. Scott Justis describes him as one of the nicest amateurs he's ever known. The following article is reprinted from his January 1981 issue of "Between The Stars". On a cold n ...
... for his gentle, warm manner and for always having a good cup of fresh brewed coffee and snacks available at all the AST events. Scott Justis describes him as one of the nicest amateurs he's ever known. The following article is reprinted from his January 1981 issue of "Between The Stars". On a cold n ...
Glossary Topics - Home - DMNS Galaxy Guide Portal
... Why the Sun is no longer in a person’s sign/constellation on his or her birthday Forms of astrology have been around in many cultures for thousands of years. However, the classical Greek signs and the accompanying zodiac (from the Greek work “animal”) were published around the time of Hipparchus (ci ...
... Why the Sun is no longer in a person’s sign/constellation on his or her birthday Forms of astrology have been around in many cultures for thousands of years. However, the classical Greek signs and the accompanying zodiac (from the Greek work “animal”) were published around the time of Hipparchus (ci ...
Getting to Know: Structure of the Universe
... A solar system is a star and the objects that orbit that star. Scientists have found several solar systems in our galaxy, many of which have planets surrounding them. If the Milky Way galaxy were the size of a quarter, the Sun would be the size of a single speck of dust on that quarter. The Sun and ...
... A solar system is a star and the objects that orbit that star. Scientists have found several solar systems in our galaxy, many of which have planets surrounding them. If the Milky Way galaxy were the size of a quarter, the Sun would be the size of a single speck of dust on that quarter. The Sun and ...
a new isotopic abundance anomaly in chemically peculiar stars
... The stars with isotopic anomalies are members of a diverse group with unusual and sometimes bizarre surface compositions. They are now called CP stars, where the “CP” stands for chemically peculiar. This notation was introduced to describe chemically peculiar main-sequence stars – stars still conver ...
... The stars with isotopic anomalies are members of a diverse group with unusual and sometimes bizarre surface compositions. They are now called CP stars, where the “CP” stands for chemically peculiar. This notation was introduced to describe chemically peculiar main-sequence stars – stars still conver ...
STAR FORMATION (Ch. 19)
... Hard to detect because so faint, but by now 100s have been discovered. (Read Discovery 19-1, p. 511). It is still unknown whether brown dwarfs, which can be as low-mass as 0.01 Msun or even less, form in the same way stars do, or if some of them form like planets, in disks. High-mass stars: You may ...
... Hard to detect because so faint, but by now 100s have been discovered. (Read Discovery 19-1, p. 511). It is still unknown whether brown dwarfs, which can be as low-mass as 0.01 Msun or even less, form in the same way stars do, or if some of them form like planets, in disks. High-mass stars: You may ...
Lecture 9: Stellar Spectra
... We can also determine the abundances of many elements in stars by using the “atomic fingerprints” seen in spectral absorption lines. We first determine (1) the star’s temperature (spectral class) (2) the star’s surface density (luminosity class) Once these are known, we can then estimate the abundan ...
... We can also determine the abundances of many elements in stars by using the “atomic fingerprints” seen in spectral absorption lines. We first determine (1) the star’s temperature (spectral class) (2) the star’s surface density (luminosity class) Once these are known, we can then estimate the abundan ...
Galaxies
... This lesson deals with important topics relating to galaxies. Each of these topics represents a great body of knowledge and areas of interest to research. Historically, galaxies were called nebulae meaning clouds and only later was it realised that they were vast collections of stars, gas and dust l ...
... This lesson deals with important topics relating to galaxies. Each of these topics represents a great body of knowledge and areas of interest to research. Historically, galaxies were called nebulae meaning clouds and only later was it realised that they were vast collections of stars, gas and dust l ...
Stars - Academic Computer Center
... • But as we already know we can learn a lot from light! • Light can tell us about a star’s: ...
... • But as we already know we can learn a lot from light! • Light can tell us about a star’s: ...
Chapter 30 Notes
... • light-year the distance that light travels in one year. • Distances between the stars and Earth are measured in light-years. • parallax an apparent shift in the position of an object when viewed from different locations. • For relatively close stars, scientists determine a star’s distance by measu ...
... • light-year the distance that light travels in one year. • Distances between the stars and Earth are measured in light-years. • parallax an apparent shift in the position of an object when viewed from different locations. • For relatively close stars, scientists determine a star’s distance by measu ...
Aries (constellation)
Aries is one of the constellations of the zodiac. It is located in the northern celestial hemisphere between Pisces to the west and Taurus to the east. The name Aries is Latin for ram, and its symbol is 20px (Unicode ♈), representing a ram's horns. It is one of the 48 constellations described by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. It is a mid-sized constellation, ranking 39th overall size, with an area of 441 square degrees (1.1% of the celestial sphere).Although Aries came to represent specifically the ram whose fleece became the Golden Fleece of Ancient Greek mythology, it has represented a ram since late Babylonian times. Before that, the stars of Aries formed a farmhand. Different cultures have incorporated the stars of Aries into different constellations including twin inspectors in China and a porpoise in the Marshall Islands. Aries is a relatively dim constellation, possessing only four bright stars: Hamal (Alpha Arietis, second magnitude), Sheratan (Beta Arietis, third magnitude), Mesarthim (Gamma Arietis, fourth magnitude), and 41 Arietis (also fourth magnitude). The few deep-sky objects within the constellation are quite faint and include several pairs of interacting galaxies. Several meteor showers appear to radiate from Aries, including the Daytime Arietids and the Epsilon Arietids.