A Compilation of Relevant Articles from MMM`s first 25 years, issues
... 1.A. Proxima Centauri, a small red M-type star, is just a little closer than the Alpha Centauri double sun of which it is a distant companion. This system lies 60° below the celestial equator, well below the horizon from most of the USA. 2.A. 106 million times as far as the Moon, and 9,000 times as ...
... 1.A. Proxima Centauri, a small red M-type star, is just a little closer than the Alpha Centauri double sun of which it is a distant companion. This system lies 60° below the celestial equator, well below the horizon from most of the USA. 2.A. 106 million times as far as the Moon, and 9,000 times as ...
Article PDF - IOPscience
... Wide Field Planetary Camera 2 (WFPC2) archive observations. However, the number of phase points and the time window of these archive data were too sparse to allow the derivation of the variable stars’ periods. Thus, we do not know yet whether the M31 GCs show the Oosterhoff dichotomy, or whether ind ...
... Wide Field Planetary Camera 2 (WFPC2) archive observations. However, the number of phase points and the time window of these archive data were too sparse to allow the derivation of the variable stars’ periods. Thus, we do not know yet whether the M31 GCs show the Oosterhoff dichotomy, or whether ind ...
Parallax
... Of course astronomers are not ones to use simple methods. They have goobered up this measurement just like the ones with magnitude. So keep reading and the enumeration as to how astronomers use parallax to measure the distance to a star will be given. Except for our sun, the stars are pretty far aw ...
... Of course astronomers are not ones to use simple methods. They have goobered up this measurement just like the ones with magnitude. So keep reading and the enumeration as to how astronomers use parallax to measure the distance to a star will be given. Except for our sun, the stars are pretty far aw ...
P7 Further Physics
... Astronomers often use the “parsec” to describe galactic distances. A parsec is roughly 3¼ light years. Angles involved in parallax measurements are often very small and are measured in seconds of an arc (arcseconds). A second of an arc is 1/60th of a minute of an arc, which is 1/60th of a degree. In ...
... Astronomers often use the “parsec” to describe galactic distances. A parsec is roughly 3¼ light years. Angles involved in parallax measurements are often very small and are measured in seconds of an arc (arcseconds). A second of an arc is 1/60th of a minute of an arc, which is 1/60th of a degree. In ...
The Formation and Evolution of the Milky Way
... blobs of gas. How the universe made the Milky Way from such simple beginnings is not altogether clear. The task of unraveling this mystery has been cast to astronomers, such as myself, who attempt to construct models of the Galaxy’s evolution based on its present appearance. These models need to acc ...
... blobs of gas. How the universe made the Milky Way from such simple beginnings is not altogether clear. The task of unraveling this mystery has been cast to astronomers, such as myself, who attempt to construct models of the Galaxy’s evolution based on its present appearance. These models need to acc ...
Abundances and possible diffusion of elements in M 67 stars⋆
... of the programme stars we have used the colours (V − Ks ) and (V − Ic ), as well as the wings of the Hα lines, as primary indicators. We preferred the use of colours and Hα-line profiles to the use of metal-lines of different excitation and ionisation. The equilibria of atoms and ions are known to be ...
... of the programme stars we have used the colours (V − Ks ) and (V − Ic ), as well as the wings of the Hα lines, as primary indicators. We preferred the use of colours and Hα-line profiles to the use of metal-lines of different excitation and ionisation. The equilibria of atoms and ions are known to be ...
Comparing stars - The Open University
... the red giant is dominant.) Above and to the left of the red giants we come to the supergiants. These are larger, and thus more luminous than red giants of comparable temperature, but they also extend to higher temperatures, where they are larger and more luminous than main sequence stars of compara ...
... the red giant is dominant.) Above and to the left of the red giants we come to the supergiants. These are larger, and thus more luminous than red giants of comparable temperature, but they also extend to higher temperatures, where they are larger and more luminous than main sequence stars of compara ...
Introduction
... A galaxy is a self-gravitating system composed of an interstellar medium, stars, and dark matter. It’s difficult to overstate the role of gravity in galaxies. While the electromagnetic force has the same r 2 dependence as gravity, charge cancellation insures that large-scale electromagnetic forces a ...
... A galaxy is a self-gravitating system composed of an interstellar medium, stars, and dark matter. It’s difficult to overstate the role of gravity in galaxies. While the electromagnetic force has the same r 2 dependence as gravity, charge cancellation insures that large-scale electromagnetic forces a ...
Stellar Metamorphosis as Alternative to Nebular Hypothesis
... 5. The science establishments have found what they would consider to be an “exo-planet” without a host star. [7] Their current definition of brown dwarf and “exo-planet” will be confusing because of arbitrary definitions. [8] This discovery actually falsifies their definition of “planet” because pla ...
... 5. The science establishments have found what they would consider to be an “exo-planet” without a host star. [7] Their current definition of brown dwarf and “exo-planet” will be confusing because of arbitrary definitions. [8] This discovery actually falsifies their definition of “planet” because pla ...
Option D – Astrophysics
... around it that are held in their orbits by gravity. The solar system is an example of a planetary system. Most of the planets have one or more objects orbiting around them. These are called moons. The Sun is the only large-scale object in our solar system which emits visible light; the others are on ...
... around it that are held in their orbits by gravity. The solar system is an example of a planetary system. Most of the planets have one or more objects orbiting around them. These are called moons. The Sun is the only large-scale object in our solar system which emits visible light; the others are on ...
1 A Re-appraisal of the Habitability of Planets Around M Dwarf Stars
... Stable, hydrogen-burning, M dwarf stars comprise about 75% of all stars in the Galaxy. They are extremely long-lived and because they are much smaller in mass than the Sun (between 0.5 and 0.08 MSun), their temperature and stellar luminosity are low and peaked in the red. We have re-examined what is ...
... Stable, hydrogen-burning, M dwarf stars comprise about 75% of all stars in the Galaxy. They are extremely long-lived and because they are much smaller in mass than the Sun (between 0.5 and 0.08 MSun), their temperature and stellar luminosity are low and peaked in the red. We have re-examined what is ...
Binary Star Formation Part 2
... Therefore stars must almost always be born in multiple systems and then multiplicity declines after ~300,000 years. ...
... Therefore stars must almost always be born in multiple systems and then multiplicity declines after ~300,000 years. ...
Unraveling the Helix Nebula: Its Structure and Knots
... 213 parsecs, which is based on the trigonometric parallax of the central star (Harris et al. 1997). This yields a scale of 1′′ = 3.19 x 1015 cm and the 5.45′ semimajor axis of the nebula (O2002) is then 0.33 pc. It is necessary to comment on the nomenclature used in this paper since different and so ...
... 213 parsecs, which is based on the trigonometric parallax of the central star (Harris et al. 1997). This yields a scale of 1′′ = 3.19 x 1015 cm and the 5.45′ semimajor axis of the nebula (O2002) is then 0.33 pc. It is necessary to comment on the nomenclature used in this paper since different and so ...
Evolution of stars
... The free-fall contraction of a molecular cloud a. can be initiated by shock waves from supernovae. b. can be initiated by nearby spectral type G stars. c. can be initiated by the rotation of the cloud. d. causes the cloud to become transparent to ultraviolet radiation. e. causes the particles in the ...
... The free-fall contraction of a molecular cloud a. can be initiated by shock waves from supernovae. b. can be initiated by nearby spectral type G stars. c. can be initiated by the rotation of the cloud. d. causes the cloud to become transparent to ultraviolet radiation. e. causes the particles in the ...
Lecture Notes – Galaxies
... Clusters of Galaxies Contain from 10 – 1000s of galaxies, and are gravitationally bound systems. Spacing of galaxies is realtively close, ≈ 100 times diameter of galaxy. (For comparison, in our Galaxy the spacing of stars ≈ 106 diameter of a typical star.) Rich clusters (> 100 members) contain mostl ...
... Clusters of Galaxies Contain from 10 – 1000s of galaxies, and are gravitationally bound systems. Spacing of galaxies is realtively close, ≈ 100 times diameter of galaxy. (For comparison, in our Galaxy the spacing of stars ≈ 106 diameter of a typical star.) Rich clusters (> 100 members) contain mostl ...
preprint, pdf version - LESIA
... In the 4 June 2011 event in particular, both occultations could be recorded at each site. The population of TNOs in general, have been far more poorly studied. Up to the time of writing, only seven stellar occultations have been successfully recorded, all with CCD detectors. A double-chord occultati ...
... In the 4 June 2011 event in particular, both occultations could be recorded at each site. The population of TNOs in general, have been far more poorly studied. Up to the time of writing, only seven stellar occultations have been successfully recorded, all with CCD detectors. A double-chord occultati ...
3.2 Black body Radiation
... Almost all astronomical information from beyond the Solar System comes to us from some form of electromagnetic radiation (EMR). (Can you think of any sources of information from beyond the Solar system that do not involve EMR in some form?) We can now detect and study EMR over a range of wavelength ...
... Almost all astronomical information from beyond the Solar System comes to us from some form of electromagnetic radiation (EMR). (Can you think of any sources of information from beyond the Solar system that do not involve EMR in some form?) We can now detect and study EMR over a range of wavelength ...
Homework #3, AST 1002
... (b) It takes about five minutes for energy from the Sun's core to reach its surface. (c) The proton cycle describes the process of energy production in the Sun's core. The correct answer(s) is(are) ____________. 5. Which of the following is (are) necessary when determining the distance to a star usi ...
... (b) It takes about five minutes for energy from the Sun's core to reach its surface. (c) The proton cycle describes the process of energy production in the Sun's core. The correct answer(s) is(are) ____________. 5. Which of the following is (are) necessary when determining the distance to a star usi ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.