THE 2MASS WIDE-FIELD T DWARF SEARCH. II. DISCOVERY OF
... for each object, dithered 1000 –2000 between exposures. The sensitivity of these images was verified to be greater than that of 2MASS, which has a J-band S/N = 10 completeness limit of 15.8 (Cutri et al. 2003),6 implying that any stationary sources should have been recovered. As in Burgasser et al. ( ...
... for each object, dithered 1000 –2000 between exposures. The sensitivity of these images was verified to be greater than that of 2MASS, which has a J-band S/N = 10 completeness limit of 15.8 (Cutri et al. 2003),6 implying that any stationary sources should have been recovered. As in Burgasser et al. ( ...
STARLAB
... you told the first time. If time allows, show the Earth Cylinder or other cylinders. Try some activities from your Planetarium Activities for Student Success (PASS) volumes. (Did you send in your Product Registration form? See Note.) 6. It’s important that the students realize that you are learning ...
... you told the first time. If time allows, show the Earth Cylinder or other cylinders. Try some activities from your Planetarium Activities for Student Success (PASS) volumes. (Did you send in your Product Registration form? See Note.) 6. It’s important that the students realize that you are learning ...
Understanding Variable Stars - Central Florida Astronomical Society
... 6.34 Variable red giants in the Large Magellanic Cloud, plotted in an apparent K magnitude versus log(period) graph 209 6.35 The 1978--2004 light curve of Mira, based on visual measurements from the AAVSO International Database 210 6.36 The spectra of four pulsating red giants 213 6.37 Radius versus ...
... 6.34 Variable red giants in the Large Magellanic Cloud, plotted in an apparent K magnitude versus log(period) graph 209 6.35 The 1978--2004 light curve of Mira, based on visual measurements from the AAVSO International Database 210 6.36 The spectra of four pulsating red giants 213 6.37 Radius versus ...
Astronomy Astrophysics
... (as in Borissova et al. 2011) and we expect minimal contamination from spurious detections. This is because the identified cluster candidates stem from a color–magnitude analysis (and 30% are confirmed by spectroscopy). Our new sample is also of particular interest since it is projected against the ...
... (as in Borissova et al. 2011) and we expect minimal contamination from spurious detections. This is because the identified cluster candidates stem from a color–magnitude analysis (and 30% are confirmed by spectroscopy). Our new sample is also of particular interest since it is projected against the ...
THE DEMOGRAPHICS OF LONG-PERIOD COMETS ABSTRACT
... of our sample due to failed follow-up. This is probably a conservative upper limit: most of these lost objects were most likely either not real to begin with or fastmoving objects only visible for a short window of time. Secondly, some comets might have been inactive at these large heliocentric dist ...
... of our sample due to failed follow-up. This is probably a conservative upper limit: most of these lost objects were most likely either not real to begin with or fastmoving objects only visible for a short window of time. Secondly, some comets might have been inactive at these large heliocentric dist ...
A spectroscopic study of detached binary systems using precise radial velocities
... system has been studied using two or more complementary observing techniques. Two of the suitable techniques are astrometry and spectroscopy. In favourable circumstances, astrometry can deduce the angular dimensions of the orbit, the total mass of the system, and sometimes, its distance from us. Spe ...
... system has been studied using two or more complementary observing techniques. Two of the suitable techniques are astrometry and spectroscopy. In favourable circumstances, astrometry can deduce the angular dimensions of the orbit, the total mass of the system, and sometimes, its distance from us. Spe ...
the fixed stars
... arbitrators, but exposes to cruel and severe trials. By the Kabalists this constellation is associated with the Hebrew letter Shin and the 22nd Tarot Trump, The Fool". (Robson). Rising: Cepheus will not engender dispositions inclined to sport. He fashions faces marked by a stern demeanour, and mould ...
... arbitrators, but exposes to cruel and severe trials. By the Kabalists this constellation is associated with the Hebrew letter Shin and the 22nd Tarot Trump, The Fool". (Robson). Rising: Cepheus will not engender dispositions inclined to sport. He fashions faces marked by a stern demeanour, and mould ...
here
... minutes to 24.8 arc minutes but increases in illumination from 27% to 48% during the course of the month. As the sun rises in late May, Venus will reach an altitude of about 23 degrees for observers at 40 degrees north. The brightest planet is at the descending node on May 9th. On May 22nd, Venus li ...
... minutes to 24.8 arc minutes but increases in illumination from 27% to 48% during the course of the month. As the sun rises in late May, Venus will reach an altitude of about 23 degrees for observers at 40 degrees north. The brightest planet is at the descending node on May 9th. On May 22nd, Venus li ...
Colour-magnitude diagrams of the post
... essentially no blue MS contamination is seen, and stars in the locus of the blue HB are still seen. A quantitative check of the presence of an HB was carried out by counting stars in frames with different apertures around the cluster center. In Table 2 are given the numbers corresponding to: HB cont ...
... essentially no blue MS contamination is seen, and stars in the locus of the blue HB are still seen. A quantitative check of the presence of an HB was carried out by counting stars in frames with different apertures around the cluster center. In Table 2 are given the numbers corresponding to: HB cont ...
Book Describing Techniques to Detect Transiting ExoPlanets
... How things change! We now know that planets are everywhere in the galaxy. Billions upon billions of planets must exist! This is the message from the tally of ~ 400 extra-solar planetary systems (as of mid-2009). Among them are 60 exoplanets that transit in front of their star (46 that are brighter t ...
... How things change! We now know that planets are everywhere in the galaxy. Billions upon billions of planets must exist! This is the message from the tally of ~ 400 extra-solar planetary systems (as of mid-2009). Among them are 60 exoplanets that transit in front of their star (46 that are brighter t ...
148 Jun - British Astronomical Association
... system with the stars separated though still quite close. It appears that the orbit of the eclipsing stars is ellipitical as the secondary minimum does not occur at 0.5 of the system’s phase. RX Herculis is roughly midway between Rasalhague and Altair. AK Herculis Although this system is not on our ...
... system with the stars separated though still quite close. It appears that the orbit of the eclipsing stars is ellipitical as the secondary minimum does not occur at 0.5 of the system’s phase. RX Herculis is roughly midway between Rasalhague and Altair. AK Herculis Although this system is not on our ...
Structure in the first quadrant of the Galaxy: an analysis of TMGS star
... detailed analyses of the content of the IRAS sky (Walker et al. 1989). These comprise 33 ‘normal’ stellar types; 42 types of AGB star, both oxygen- and carbon-rich; six types of object that are distinct from others only in their MIR high luminosity; and six types of exotica including H ii regions, p ...
... detailed analyses of the content of the IRAS sky (Walker et al. 1989). These comprise 33 ‘normal’ stellar types; 42 types of AGB star, both oxygen- and carbon-rich; six types of object that are distinct from others only in their MIR high luminosity; and six types of exotica including H ii regions, p ...
SkyWatcher2017.5 1.3 Mb - Boise Astronomical Society
... luminosity distance of DL = 749 mega-parsecs may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of −26.7, meaning that if it were only as distant as Pollux it would appear nearly as bright in the sky as the Sun. Since the sun's absolute magnitude ...
... luminosity distance of DL = 749 mega-parsecs may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of −26.7, meaning that if it were only as distant as Pollux it would appear nearly as bright in the sky as the Sun. Since the sun's absolute magnitude ...
X. Nuclear star clusters in low-mass early-type galaxies
... computations, the theoretical framework for the dissipational formation of NSCs provides less quantitative predictions than the inspiralling cluster scenario. There is evidence that both the in situ as well as the GC inspiralling formation happen in galaxies. Evidence for the GC inspiral scenario is ...
... computations, the theoretical framework for the dissipational formation of NSCs provides less quantitative predictions than the inspiralling cluster scenario. There is evidence that both the in situ as well as the GC inspiralling formation happen in galaxies. Evidence for the GC inspiral scenario is ...
365 days of SKYWATCHING
... study - the Moon. Its rugged craters, high mountains and vast seas offer some of the finest details to be found in any astronomical target. It changes every night as the terminator - the line between sunset and shadow - progresses over the surface, revealing new details. Unlike a star chart, Moon fea ...
... study - the Moon. Its rugged craters, high mountains and vast seas offer some of the finest details to be found in any astronomical target. It changes every night as the terminator - the line between sunset and shadow - progresses over the surface, revealing new details. Unlike a star chart, Moon fea ...
Ages of Young Stars
... rapidly. This creates a sharp, age-dependent, lithium depletion boundary (LDB) between stars at low luminosities retaining all their initial Li and those at only slightly higher luminosities with total Li depletion. The LDB technique is “semi-fundamental” because it relies on well-understood physics ...
... rapidly. This creates a sharp, age-dependent, lithium depletion boundary (LDB) between stars at low luminosities retaining all their initial Li and those at only slightly higher luminosities with total Li depletion. The LDB technique is “semi-fundamental” because it relies on well-understood physics ...
Ages of young stars
... rapidly. This creates a sharp, age-dependent, lithium depletion boundary (LDB) between stars at low luminosities retaining all their initial Li and those at only slightly higher luminosities with total Li depletion. The LDB technique is “semi-fundamental” because it relies on well-understood physics ...
... rapidly. This creates a sharp, age-dependent, lithium depletion boundary (LDB) between stars at low luminosities retaining all their initial Li and those at only slightly higher luminosities with total Li depletion. The LDB technique is “semi-fundamental” because it relies on well-understood physics ...
Spectroscopic Atlas for Amateur Astronomers
... Very useful is Spectroweb [59], to find on the home page of Dr. Alex Lobel, Royal Observatory of Belgium. It’s an interactive internet platform providing highly resolved and almost completely commented profiles of some bright stars, belonging to the middle and late spectral classes F, G, K, M. Due t ...
... Very useful is Spectroweb [59], to find on the home page of Dr. Alex Lobel, Royal Observatory of Belgium. It’s an interactive internet platform providing highly resolved and almost completely commented profiles of some bright stars, belonging to the middle and late spectral classes F, G, K, M. Due t ...
LACEwING: A New Moving Group Analysis Code
... 2. The LACEwING Moving Group Identification Code LACEwING is a frequentist observation space kinematic moving group identification code. Using the spatial and kinematic information available about a target object (α, δ, Dist, μα, μδ, and γ), it determines the probability that the object is a member of ...
... 2. The LACEwING Moving Group Identification Code LACEwING is a frequentist observation space kinematic moving group identification code. Using the spatial and kinematic information available about a target object (α, δ, Dist, μα, μδ, and γ), it determines the probability that the object is a member of ...
Selected observation targets at a glance per constellation
... type F, will move to the constellation Pictor around the year 6400 AD. S Doradus. Hypergiant, a prototype of the group S Doradus class of variable stars, is the brightest member of the open cluster NGC 1910: latter visible in binoculars as a bright condensation within the main bar of the LMC. Is usu ...
... type F, will move to the constellation Pictor around the year 6400 AD. S Doradus. Hypergiant, a prototype of the group S Doradus class of variable stars, is the brightest member of the open cluster NGC 1910: latter visible in binoculars as a bright condensation within the main bar of the LMC. Is usu ...
The old globular cluster system of the dIrr galaxy NGC 1427A in the
... In all these models, the GCSs of low-mass dwarf galaxies, the most numerous galaxy type in galaxy clusters (Sandage 2005, and references therein), are envisioned as the building blocks of the GCSs of the more massive galaxies. At present the role of the GCSs of dIrr galaxies in the frame of galaxy f ...
... In all these models, the GCSs of low-mass dwarf galaxies, the most numerous galaxy type in galaxy clusters (Sandage 2005, and references therein), are envisioned as the building blocks of the GCSs of the more massive galaxies. At present the role of the GCSs of dIrr galaxies in the frame of galaxy f ...
The Milky Way - The Independent School
... E. Supermassive Black Holes in Galaxies F. Dark Matter in Galaxies G. Gravitational Lensing and Dark Matter ...
... E. Supermassive Black Holes in Galaxies F. Dark Matter in Galaxies G. Gravitational Lensing and Dark Matter ...
constellations - Richmond and Glen Allen Weather
... even the bright sun is dimmed toward one’s horizon at setting or rising. The apparent magnitude difference from the zenith to the horizon is approximately two magnitudes dimmer in brightness. 2. The least desirable time to observe the constellations is when the moon, brighter than a quarter phase, i ...
... even the bright sun is dimmed toward one’s horizon at setting or rising. The apparent magnitude difference from the zenith to the horizon is approximately two magnitudes dimmer in brightness. 2. The least desirable time to observe the constellations is when the moon, brighter than a quarter phase, i ...
Planetary Nebula
... thinking on this nebula’s formation focused around the central star itself. But the motions of the gas are also being observed and a recent study suggest that some of the structures observed are caused by the interaction of central star wind and radiation with preplanetary nebula debris: planets, mo ...
... thinking on this nebula’s formation focused around the central star itself. But the motions of the gas are also being observed and a recent study suggest that some of the structures observed are caused by the interaction of central star wind and radiation with preplanetary nebula debris: planets, mo ...
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.