Red supergiants and the past of Cygnus OB2
... Methods. Near-infrared star counts in the Cygnus region reveal moderate evidence for a peak in the areal density of bright, reddened stars approximately coincident with Cygnus OB2. A total of 11 sources are found within a circle of 1◦ radius centered on the association, of which 4 are non-supergiant ...
... Methods. Near-infrared star counts in the Cygnus region reveal moderate evidence for a peak in the areal density of bright, reddened stars approximately coincident with Cygnus OB2. A total of 11 sources are found within a circle of 1◦ radius centered on the association, of which 4 are non-supergiant ...
WHAT MAKES A STAR SO SPECIAL Abstract
... luminosity, or 1000 red stars from class M with low luminosity. This statistics shows that the formation of stars with low masses is a very common process. If we plot the spectral classes (or the temperature, which is the same) along the x-axis and the luminosity (or stars’ absolute magnitude) along ...
... luminosity, or 1000 red stars from class M with low luminosity. This statistics shows that the formation of stars with low masses is a very common process. If we plot the spectral classes (or the temperature, which is the same) along the x-axis and the luminosity (or stars’ absolute magnitude) along ...
monoceros, the unicorn
... to the world should endeavor to ban unicorns from Scripture. In order to do so, the latest technique is to suppose that God did not mean to say unicorn, or did not say so in the “original autographs” which, as they no longer exist having long since turned to dust, we (conveniently) cannot check. Hen ...
... to the world should endeavor to ban unicorns from Scripture. In order to do so, the latest technique is to suppose that God did not mean to say unicorn, or did not say so in the “original autographs” which, as they no longer exist having long since turned to dust, we (conveniently) cannot check. Hen ...
PDF - Department of Statistics
... phase of the early evolution of the solar system. This belt is the source of most short–period comets, those with periods of 200 years or less [Edgeworth, 1949], [Kuiper, 1951], [Fernandez, 1980]. Observational success was first achieved with the discovery of 1992QB1 [Jewitt and Luu, 1993]. Major ob ...
... phase of the early evolution of the solar system. This belt is the source of most short–period comets, those with periods of 200 years or less [Edgeworth, 1949], [Kuiper, 1951], [Fernandez, 1980]. Observational success was first achieved with the discovery of 1992QB1 [Jewitt and Luu, 1993]. Major ob ...
Distance determination for RAVE stars using stellar models
... ated. The right panel Fig. 1 shows isochrones of similar chemical composition and can be compared to the stellar tracks shown on the left panel. All stars on the 0.01 Gyr isochrone are still on the main sequence. For older isochrones we can clearly see the main sequence turnoff points, the point at ...
... ated. The right panel Fig. 1 shows isochrones of similar chemical composition and can be compared to the stellar tracks shown on the left panel. All stars on the 0.01 Gyr isochrone are still on the main sequence. For older isochrones we can clearly see the main sequence turnoff points, the point at ...
Chapter 12: Stars and Galaxies
... Table 4 lists and shows four major stars that make up the constellation of Orion. Even though the stars might look similar to your eye, they are all very different. What can you learn about these stars from their data? Recall that a smaller magnitude means brighter. Although Bellatrix is the closest ...
... Table 4 lists and shows four major stars that make up the constellation of Orion. Even though the stars might look similar to your eye, they are all very different. What can you learn about these stars from their data? Recall that a smaller magnitude means brighter. Although Bellatrix is the closest ...
Chapter 16--Properties of Stars
... century, humans classified stars primarily by their brightness and location in our sky. The names of the brightest stars within each constellation still bear Greek letters designating their order of brightness. For example, the brightest star in the constellation Centaurus is Alpha Centauri, the sec ...
... century, humans classified stars primarily by their brightness and location in our sky. The names of the brightest stars within each constellation still bear Greek letters designating their order of brightness. For example, the brightest star in the constellation Centaurus is Alpha Centauri, the sec ...
High Precision Parallax Collecting Satellite
... Many a night I saw the Pleiads, rising thro’ the mellow shade Glitter like a swarm of fireflies, tangled in a silver braid. ...
... Many a night I saw the Pleiads, rising thro’ the mellow shade Glitter like a swarm of fireflies, tangled in a silver braid. ...
Main-Sequence Stars and the Sun
... wanted to describe it in astronomical nomenclature, we would call it a G2V star. Its spectral class is G2, and its luminosity class is V. Be careful not to confuse type V main-sequence stars with white dwarfs, which are much smaller. White dwarfs will be discussed in Chapter 9. ...
... wanted to describe it in astronomical nomenclature, we would call it a G2V star. Its spectral class is G2, and its luminosity class is V. Be careful not to confuse type V main-sequence stars with white dwarfs, which are much smaller. White dwarfs will be discussed in Chapter 9. ...
Small galaxies are growing smaller
... decade with the development of multi-object spectroscopy. With the “2 degree Field” (2dF) spectrograph on the Anglo-Australian Telescope, for instance, we can now obtain spectra for 400 objects simultaneously. This has enabled the present generation of huge galaxy redshift surveys, such as 2dFGRS wi ...
... decade with the development of multi-object spectroscopy. With the “2 degree Field” (2dF) spectrograph on the Anglo-Australian Telescope, for instance, we can now obtain spectra for 400 objects simultaneously. This has enabled the present generation of huge galaxy redshift surveys, such as 2dFGRS wi ...
Cepheid
... Consider a Couple of Her Stars 1. The brightest Cepheid in the table varies over magnitudes ranging from 11.2 (at maximum luminosity) to 12.1 (at the faintest), with an ‘average’ of ~ 11.65. Its period is 127 days (more than four months). Note, by the way, that this star is ~5 magnitudes (a factor ...
... Consider a Couple of Her Stars 1. The brightest Cepheid in the table varies over magnitudes ranging from 11.2 (at maximum luminosity) to 12.1 (at the faintest), with an ‘average’ of ~ 11.65. Its period is 127 days (more than four months). Note, by the way, that this star is ~5 magnitudes (a factor ...
ppt - SLAC
... 2. Atmospheric pressure depends on the star's surface gravity and so, roughly, on its size —a giant, dwarf, or in between. The size and surface brightness yield the star's luminosity and often its evolutionary status (young, middle-aged, or nearing death). Apparent brightness then gives an idea of t ...
... 2. Atmospheric pressure depends on the star's surface gravity and so, roughly, on its size —a giant, dwarf, or in between. The size and surface brightness yield the star's luminosity and often its evolutionary status (young, middle-aged, or nearing death). Apparent brightness then gives an idea of t ...
Observing Stellar Evolution
... Stellar evolution – refers to the stages in the lifetime of one star. When biologists talk about evolution they mean intergenerational evolution. While stars change from one generation to the next, the focus of this program is stellar lifetimes. Burning – The materials that comprise stars do not 'bu ...
... Stellar evolution – refers to the stages in the lifetime of one star. When biologists talk about evolution they mean intergenerational evolution. While stars change from one generation to the next, the focus of this program is stellar lifetimes. Burning – The materials that comprise stars do not 'bu ...
Kinetic equilibrium of iron in the atmospheres of cool stars
... means of three independent methods. In principle the most reliable approach uses astrometry (presently the H parallaxes, ESA 1997) with an appropriate guess of the stellar mass, which enters the resulting log g only with a σ(log M) uncertainty. Since the mass uncertainty of these very old st ...
... means of three independent methods. In principle the most reliable approach uses astrometry (presently the H parallaxes, ESA 1997) with an appropriate guess of the stellar mass, which enters the resulting log g only with a σ(log M) uncertainty. Since the mass uncertainty of these very old st ...
Compare/Order Decimals
... B. 0.6 + 0.008 + 0.0007 Standard form: 0.6087 Word form: six thousand eighty-seven tenthousandths Course 1 ...
... B. 0.6 + 0.008 + 0.0007 Standard form: 0.6087 Word form: six thousand eighty-seven tenthousandths Course 1 ...
November, 2015 - The Baton Rouge Astronomical Society
... One big early surprise (1995) was the ground-based discovery of “hot Jupiters:” gas giants the size of Jupiter in orbits around their parent stars much closer than Venus—or even Mercury—is to the Sun. How does something that massive form so close to a parent star? Would there have been enough materi ...
... One big early surprise (1995) was the ground-based discovery of “hot Jupiters:” gas giants the size of Jupiter in orbits around their parent stars much closer than Venus—or even Mercury—is to the Sun. How does something that massive form so close to a parent star? Would there have been enough materi ...
Lecture 14
... satellites into space to measure very precise parallax? • Would it be easier to measure parallax from Jupiter? From Venus? ...
... satellites into space to measure very precise parallax? • Would it be easier to measure parallax from Jupiter? From Venus? ...
Sky and Telescope - CAMS
... out to be the most interesting for meteor observations. The new CAMS data show that at least 14 significant showers are active that week, each with its own particular radiant direction on the sky, velocity, duration (indicating stream width), and behavior. Five of these showers were completely new t ...
... out to be the most interesting for meteor observations. The new CAMS data show that at least 14 significant showers are active that week, each with its own particular radiant direction on the sky, velocity, duration (indicating stream width), and behavior. Five of these showers were completely new t ...
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 ...
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 ...
... 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 ...
How to Build an Astrolabe
... rete. Its name is taken from the Latin word for ‘net’, because of the appearance of the spikes which indicated the positions of individual stars. The rete also shows the path of the sun against the background stars; this path is known as the ecliptic, and the constellations through which the sun pas ...
... rete. Its name is taken from the Latin word for ‘net’, because of the appearance of the spikes which indicated the positions of individual stars. The rete also shows the path of the sun against the background stars; this path is known as the ecliptic, and the constellations through which the sun pas ...
100 Binocular Deep Sky Objects
... Besides the sheer beauty of the naked eye Milky Way, I think the best dark sky object in this area is NGC 7000, the North America nebula. In a mag 6.7 sky, this outstanding deep sky feature stood out in 15x70s like I have never seen it before in any optics. The entire Florida / Gulf of Mexico / Cent ...
... Besides the sheer beauty of the naked eye Milky Way, I think the best dark sky object in this area is NGC 7000, the North America nebula. In a mag 6.7 sky, this outstanding deep sky feature stood out in 15x70s like I have never seen it before in any optics. The entire Florida / Gulf of Mexico / Cent ...
How to Build an Astrolabe - St John`s College, Cambridge
... rete. Its name is taken from the Latin word for ‘net’, because of the appearance of the spikes which indicated the positions of individual stars. The rete also shows the path of the sun against the background stars; this path is known as the ecliptic, and the constellations through which the sun pas ...
... rete. Its name is taken from the Latin word for ‘net’, because of the appearance of the spikes which indicated the positions of individual stars. The rete also shows the path of the sun against the background stars; this path is known as the ecliptic, and the constellations through which the sun pas ...
Star Formation in Bok Globules - European Southern Observatory
... is a huge, faintly luminous H 1I region spread over more than 30 degrees of the southern sky. At a distance of roughly 450 pc this corresponds to a radius of about 125 pc, making the Gum Nebula one of the largest structures known in our galaxy. Near its center are several objects which tagether prod ...
... is a huge, faintly luminous H 1I region spread over more than 30 degrees of the southern sky. At a distance of roughly 450 pc this corresponds to a radius of about 125 pc, making the Gum Nebula one of the largest structures known in our galaxy. Near its center are several objects which tagether prod ...
May 2017 Astronomy Calendar by Dave Mitsky
... to magnitude -2.1 this month. The gas giant is located three degrees southeast of the thirdmagnitude star Gamma Virginis and sets around 3:00 a.m. as June begins. It ends retrograde (westward) motion on June 9th. Double Galilean satellite shadow transits take place on June 2nd, June 4th, June 5th, J ...
... to magnitude -2.1 this month. The gas giant is located three degrees southeast of the thirdmagnitude star Gamma Virginis and sets around 3:00 a.m. as June begins. It ends retrograde (westward) motion on June 9th. Double Galilean satellite shadow transits take place on June 2nd, June 4th, June 5th, J ...
Canis Minor
Canis Minor /ˌkeɪnɨs ˈmaɪnər/ is a small constellation in the northern celestial hemisphere. In the second century, it was included as an asterism, or pattern, of two stars in Ptolemy's 48 constellations, and it is counted among the 88 modern constellations. Its name is Latin for ""lesser dog"", in contrast to Canis Major, the ""greater dog""; both figures are commonly represented as following the constellation of Orion the hunter.Canis Minor contains only two stars brighter than the fourth magnitude, Procyon (Alpha Canis Minoris), with a magnitude of 0.34, and Gomeisa (Beta Canis Minoris), with a magnitude of 2.9. The constellation's dimmer stars were noted by Johann Bayer, who named eight stars including Alpha and Beta, and John Flamsteed, who numbered fourteen. Procyon is the seventh-brightest star in the night sky, as well as one of the closest. A yellow-white main sequence star, it has a white dwarf companion. Gomeisa is a blue-white main sequence star. Luyten's Star is a ninth-magnitude red dwarf and the Solar System's next closest stellar neighbour in the constellation after Procyon. The fourth-magnitude HD 66141, which has evolved into an orange giant towards the end of its life cycle, was discovered to have a planet in 2012. There are two faint deep sky objects within the constellation's borders. The 11 Canis-Minorids are a meteor shower that can be seen in early December.