BAS Visit to the Norman Lockyer Observatory, October 2015
... Omicron Ceti, better known as Mira in the constellation Cetus, is a binary star consisting of a red giant and a companion star. The system is approximately 400 light years distant. See page 13 for star map and location. Mira A, a red giant belonging to the spectral type M7 IIIe, is an oscillating va ...
... Omicron Ceti, better known as Mira in the constellation Cetus, is a binary star consisting of a red giant and a companion star. The system is approximately 400 light years distant. See page 13 for star map and location. Mira A, a red giant belonging to the spectral type M7 IIIe, is an oscillating va ...
5.1 Introduction and Definitions
... original state via two or more transitions to intermediate energy levels, then the net effect is to degrade the average energy of the photons in the radiation field. 2. Bound-free absorption. This is the familiar process of photoionisation which will occur for all photon energies hν > χn , where χn ...
... original state via two or more transitions to intermediate energy levels, then the net effect is to degrade the average energy of the photons in the radiation field. 2. Bound-free absorption. This is the familiar process of photoionisation which will occur for all photon energies hν > χn , where χn ...
Poster - unist
... evolution of GCs in the tidal fields, using N-body technique. As a result, we find that compact star clusters form under UV radiation fields and they are well consistent with the recognized correlation between velocity dispersion and mass for observed GCs. ...
... evolution of GCs in the tidal fields, using N-body technique. As a result, we find that compact star clusters form under UV radiation fields and they are well consistent with the recognized correlation between velocity dispersion and mass for observed GCs. ...
Stars, Constellations, and Quasars
... observed and studied the nighttime sky, and archaeological evidence such as Stonehenge points to these early studies of astronomy. Ancient cultures also developed elaborate mythologies around stars and constellations and gave them names, some of which are still in use today. ...
... observed and studied the nighttime sky, and archaeological evidence such as Stonehenge points to these early studies of astronomy. Ancient cultures also developed elaborate mythologies around stars and constellations and gave them names, some of which are still in use today. ...
Spectra of Star Clusters
... Every M dwarf that was ever created is still on the main sequence!! ...
... Every M dwarf that was ever created is still on the main sequence!! ...
File
... followed by the production of iron through nuclear reactions in the expanding outer layers. ...
... followed by the production of iron through nuclear reactions in the expanding outer layers. ...
Chapter 17 Measuring the Stars
... pattern begins to form. These are the 80 closest stars to us; note the dashed lines of constant radius. The darkened curve is called the main sequence, as this is where most stars are. Also indicated is the white dwarf region; these stars are hot but not very luminous, as they are quite small. ...
... pattern begins to form. These are the 80 closest stars to us; note the dashed lines of constant radius. The darkened curve is called the main sequence, as this is where most stars are. Also indicated is the white dwarf region; these stars are hot but not very luminous, as they are quite small. ...
Final Review Sheet
... The kinetic energy imparted to these ejecta is about 10**51 erg. They are made of unburned stellar envelope (usually most of the mass) but also the ashes of many different stages of nuclear burning that were going on outside the core. IX. Neutron stars Gigantic nuclei, mostly neutrons, supported by ...
... The kinetic energy imparted to these ejecta is about 10**51 erg. They are made of unburned stellar envelope (usually most of the mass) but also the ashes of many different stages of nuclear burning that were going on outside the core. IX. Neutron stars Gigantic nuclei, mostly neutrons, supported by ...
bright - TutorPlus
... • The smaller the value, the brighter the star. • The Sun has a value of -27. A full moon has value -13. ...
... • The smaller the value, the brighter the star. • The Sun has a value of -27. A full moon has value -13. ...
Measuring the mass of galaxies Luminous matter in a
... 4) Black holes - either formed from the collapse of very massive stars, or primordial (formed in the early Universe) 5) Unknown elementary particles - stable particles which have not yet been discovered in lab experiments on Earth (e.g. because they are too massive) Called NON-BARYONIC DARK MATTER M ...
... 4) Black holes - either formed from the collapse of very massive stars, or primordial (formed in the early Universe) 5) Unknown elementary particles - stable particles which have not yet been discovered in lab experiments on Earth (e.g. because they are too massive) Called NON-BARYONIC DARK MATTER M ...
Draft paper (Published in ApJL)
... halo virial mass. The top-right panel shows the present-day star formation rate as a function of galaxy stellar mass. Two populations are identified: (i) galaxies that form stars at rates comparable to their past average (blue triangles), and (ii) those where star formation has largely ceased (red c ...
... halo virial mass. The top-right panel shows the present-day star formation rate as a function of galaxy stellar mass. Two populations are identified: (i) galaxies that form stars at rates comparable to their past average (blue triangles), and (ii) those where star formation has largely ceased (red c ...
Document
... H-R diagrams are useful because they help astronomers categorize stars into groups: Main sequence stars, like the Sun, are in a very stable part of their life cycle. White dwarfs are hot and dim and cannot be seen without a telescope. Red giants are cool and bright and some can be seen witho ...
... H-R diagrams are useful because they help astronomers categorize stars into groups: Main sequence stars, like the Sun, are in a very stable part of their life cycle. White dwarfs are hot and dim and cannot be seen without a telescope. Red giants are cool and bright and some can be seen witho ...
Unpublished draft available in format
... classification in this subject is inevitably that of Whole-part, giving a hierarchy of galactic groups (the most comprehensive unit of aggregation), galaxies, sub-galactic systems, starsystems, etc. Provision for the general treatment of any notional body or system (from particles, through dust to p ...
... classification in this subject is inevitably that of Whole-part, giving a hierarchy of galactic groups (the most comprehensive unit of aggregation), galaxies, sub-galactic systems, starsystems, etc. Provision for the general treatment of any notional body or system (from particles, through dust to p ...
Question 1 The star Regulus, in the constellation Leo, appears
... unit area varies with distance d according to which of the following laws (∝ means “proportional to”)? ...
... unit area varies with distance d according to which of the following laws (∝ means “proportional to”)? ...
February 13
... Convective Zone – outer 29 percent of Sun’s interior. Bottom of convective zone is cool enough for heavy atoms to regain electrons and absorb light. ...
... Convective Zone – outer 29 percent of Sun’s interior. Bottom of convective zone is cool enough for heavy atoms to regain electrons and absorb light. ...
Connecting Stars, Galaxies and the Universe
... of detached eclipsing binaries (DEBs) will be particularly useful. For DEBs within 1.5 kpc or so, SIM-Lite can measure distances to better than ½%, which makes it possible to determine their ages with similar accuracies as can be accomplished with cosmological methods1. This “d½%sample” would be the ...
... of detached eclipsing binaries (DEBs) will be particularly useful. For DEBs within 1.5 kpc or so, SIM-Lite can measure distances to better than ½%, which makes it possible to determine their ages with similar accuracies as can be accomplished with cosmological methods1. This “d½%sample” would be the ...
Characterizing Stars - Department of Physics and Astronomy
... • The greater the mass of a main-sequence star, the greater its luminosity (and also the greater its radius and surface temperature) ...
... • The greater the mass of a main-sequence star, the greater its luminosity (and also the greater its radius and surface temperature) ...
4. Stars and resolved stellar populations
... individual emission knots, wiggles, and sideways shocks in the jet beam (cf. Fig. 4-1), which are otherwise blended in seeing-limited optical studies. This combination of broad line coverage, kinematics, and high angular resolution over a wide field of view will represent an outstanding gain in qual ...
... individual emission knots, wiggles, and sideways shocks in the jet beam (cf. Fig. 4-1), which are otherwise blended in seeing-limited optical studies. This combination of broad line coverage, kinematics, and high angular resolution over a wide field of view will represent an outstanding gain in qual ...
Star Formation in the Milky Way - HubbleSOURCE
... The variables of “Orion Type” were very similar to the T Tauris ...
... The variables of “Orion Type” were very similar to the T Tauris ...
Omega Centauri
... It is very likely that M54 and the Sagittarius nucleus show us what Omega Centauri was a few billion years ago: the central part of a dwarf galaxy, now disrupted by the Galactic tidal field. But, where is the tidal tail of Omega Centauri (see Da Costa et al. 2008)? ...
... It is very likely that M54 and the Sagittarius nucleus show us what Omega Centauri was a few billion years ago: the central part of a dwarf galaxy, now disrupted by the Galactic tidal field. But, where is the tidal tail of Omega Centauri (see Da Costa et al. 2008)? ...
OGU - What`s Out Tonight?
... constellation Centaurus are 29 million times farther away from one another. Proportionately, there is truly enormous amounts of space between stars, but not between galaxies Galaxies cluster in groups. These groups are gravitationally bound and the galaxies within them revolve about one another, but ...
... constellation Centaurus are 29 million times farther away from one another. Proportionately, there is truly enormous amounts of space between stars, but not between galaxies Galaxies cluster in groups. These groups are gravitationally bound and the galaxies within them revolve about one another, but ...
A Massive Molecular Gas Reservoir in the z= 5.3 Submillimeter
... Our understanding of the physical properties of submillimeter galaxies (SMGs; see review by Blain et al. 2002) is of key importance to studies of the early formation and evolution of massive galaxies, as they are the likely progenitors of the most massive galaxies in the present-day universe. SMGs t ...
... Our understanding of the physical properties of submillimeter galaxies (SMGs; see review by Blain et al. 2002) is of key importance to studies of the early formation and evolution of massive galaxies, as they are the likely progenitors of the most massive galaxies in the present-day universe. SMGs t ...
1/2016
... Distance = approximately 887 light years Description: Delta Cephei is the prototype of the Cepheid class of variable stars. With a change in visual magnitude of 3.5 to 4.4, delta Cephei’s entire range of variability can be observed with the unaided eye. Its period of 5.366 days makes it an attractiv ...
... Distance = approximately 887 light years Description: Delta Cephei is the prototype of the Cepheid class of variable stars. With a change in visual magnitude of 3.5 to 4.4, delta Cephei’s entire range of variability can be observed with the unaided eye. Its period of 5.366 days makes it an attractiv ...
H II region
An H II region is a large, low-density cloud of partially ionized gas in which star formation has recently taken place. The short-lived blue stars forged in these regions emit copious amounts of ultraviolet light that ionize the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds. The first known H II region was the Orion Nebula, which was discovered in 1610 by Nicolas-Claude Fabri de Peiresc.H II regions are named for the large amount of ionised atomic hydrogen they contain, referred to as H II, pronounced H-two by astronomers (an H I region being neutral atomic hydrogen, and H2 being molecular hydrogen). Such regions have extremely diverse shapes, because the distribution of the stars and gas inside them is irregular. They often appear clumpy and filamentary, sometimes showing bizarre shapes such as the Horsehead Nebula. H II regions may give birth to thousands of stars over a period of several million years. In the end, supernova explosions and strong stellar winds from the most massive stars in the resulting star cluster will disperse the gases of the H II region, leaving behind a cluster of birthed stars such as the Pleiades.H II regions can be seen to considerable distances in the universe, and the study of extragalactic H II regions is important in determining the distance and chemical composition of other galaxies. Spiral and irregular galaxies contain many H II regions, while elliptical galaxies are almost devoid of them. In the spiral galaxies, including the Milky Way, H II regions are concentrated in the spiral arms, while in the irregular galaxies they are distributed chaotically. Some galaxies contain huge H II regions, which may contain tens of thousands of stars. Examples include the 30 Doradus region in the Large Magellanic Cloud and NGC 604 in the Triangulum Galaxy.