Discovery of White Dwarfs—8 Oct
... Main-sequence or dwarf stars Giants Horizontal-branch stars White dwarfs are too faint for these observations. A star lives a long time as a dwarf. It is on the main sequence. When it runs out of fuel, it becomes a giant and subsequently “traces out the giant branch.” ...
... Main-sequence or dwarf stars Giants Horizontal-branch stars White dwarfs are too faint for these observations. A star lives a long time as a dwarf. It is on the main sequence. When it runs out of fuel, it becomes a giant and subsequently “traces out the giant branch.” ...
The Properties of Stars Early in its history, the universe organized
... distributed these heavier elements throughout the galaxy so that late-generation stars had small but significant amounts of elements heavier than helium. Our sun, which formed 4.6 billion years ago, is one such star. The Sun: An Average Star After eons of observing the fiery ball they saw in the day ...
... distributed these heavier elements throughout the galaxy so that late-generation stars had small but significant amounts of elements heavier than helium. Our sun, which formed 4.6 billion years ago, is one such star. The Sun: An Average Star After eons of observing the fiery ball they saw in the day ...
Stars and Galaxies
... Parallax (let’s model it) As Earth orbits the Sun, we see nearby stars move relative to more distant stars How many degrees did the plate move, relative to the background? ...
... Parallax (let’s model it) As Earth orbits the Sun, we see nearby stars move relative to more distant stars How many degrees did the plate move, relative to the background? ...
Black-Body SNR Formulation of Astronomical Camera
... where m is the brightness magnitude assigned to a star observed from Earth, f (·) is the mean spectral flux density at top of Earth’s atmosphere averaged over a defined band and Q(·) is the normalizing constant for that band [8]. We will not go into more details about astronomical magnitude systems ...
... where m is the brightness magnitude assigned to a star observed from Earth, f (·) is the mean spectral flux density at top of Earth’s atmosphere averaged over a defined band and Q(·) is the normalizing constant for that band [8]. We will not go into more details about astronomical magnitude systems ...
Disk Instability Models
... GQ Lup b – 1 Myr-old gas giant planet at 100 AU? (Neuhauser et al. 2005) ...
... GQ Lup b – 1 Myr-old gas giant planet at 100 AU? (Neuhauser et al. 2005) ...
Dec - National Capital Astronomers
... On November 28th, an update on the search for extraterrestrial life was released. It was in regard to K2-3d, an extrasolar planet, which was actually discovered in 2015 by the Kepler Spacecraft (NASA) as part of the K2 Mission (Kepler’s “Second Light”). K2-3d is 1.5 times Earth’s size, orbits its st ...
... On November 28th, an update on the search for extraterrestrial life was released. It was in regard to K2-3d, an extrasolar planet, which was actually discovered in 2015 by the Kepler Spacecraft (NASA) as part of the K2 Mission (Kepler’s “Second Light”). K2-3d is 1.5 times Earth’s size, orbits its st ...
First Light Sources at the End of the Dark Ages: Direct
... begun. Thus, near-infrared observations of these dwarfs could reveal strong Lyman ! and He II emission detectable by large ground-based telescopes, and possibly a rest-frame ultraviolet continuum observable from the ground and/or with the JWST. By 2016, the JWST and/or ground-based surveys will reg ...
... begun. Thus, near-infrared observations of these dwarfs could reveal strong Lyman ! and He II emission detectable by large ground-based telescopes, and possibly a rest-frame ultraviolet continuum observable from the ground and/or with the JWST. By 2016, the JWST and/or ground-based surveys will reg ...
The evolution of stars - School of Physics
... Recall that the interstellar material from which the solar system formed consists mostly of hydrogen and helium, with other elements less than one-thousandth as abundant as hydrogen. ...
... Recall that the interstellar material from which the solar system formed consists mostly of hydrogen and helium, with other elements less than one-thousandth as abundant as hydrogen. ...
z - STScI
... There is a small population of compact high-SB galaxies that do not fit in the normal ...
... There is a small population of compact high-SB galaxies that do not fit in the normal ...
THE PHYSICAL CHARACTERIZATION OF THE STARS 1
... therefore the absolute individual masses can be derived. The double-lined eclipsing binaries are extremely important, since they are the only case providing simultaneous determinations of individual masses and radii (see Sect. 3). The best reached precisions are of the order of 1-5% ([27], [4]). Suc ...
... therefore the absolute individual masses can be derived. The double-lined eclipsing binaries are extremely important, since they are the only case providing simultaneous determinations of individual masses and radii (see Sect. 3). The best reached precisions are of the order of 1-5% ([27], [4]). Suc ...
University of Groningen Mass loss and rotational CO emission
... evolved stars were obtained during several observing periods between April 2000 and September 2002 using the James Clerk Maxwell Telescope (JCMT) on Mauna Kea, Hawaii. For this purpose, all five different heterodyne receivers available at the JCMT were used, including the new MPIfR/SRON E-band recei ...
... evolved stars were obtained during several observing periods between April 2000 and September 2002 using the James Clerk Maxwell Telescope (JCMT) on Mauna Kea, Hawaii. For this purpose, all five different heterodyne receivers available at the JCMT were used, including the new MPIfR/SRON E-band recei ...
Feb 2015 - Bluewater Astronomical Society
... BAS executive positions run for two years and normally the first meeting of the year is election time. This year the executive has decided to hold elections at the April 1 meeting in 2015 so that we can implement an email voting system. This will allow all current BAS members (not just those present ...
... BAS executive positions run for two years and normally the first meeting of the year is election time. This year the executive has decided to hold elections at the April 1 meeting in 2015 so that we can implement an email voting system. This will allow all current BAS members (not just those present ...
3P15.pdf
... the photosphere to the total surface flux emitted by the star. Fig. 4a to 7a show, for all the stars of the sample, the mean value of the excess emission of the Hα line vs. the mean value of the excess emission of other chromospheric lines (Ca II λ8542Å, Ca II K, Hβ and Hγ). Fig. 4b to 7b show the s ...
... the photosphere to the total surface flux emitted by the star. Fig. 4a to 7a show, for all the stars of the sample, the mean value of the excess emission of the Hα line vs. the mean value of the excess emission of other chromospheric lines (Ca II λ8542Å, Ca II K, Hβ and Hγ). Fig. 4b to 7b show the s ...
Life Stages of High
... • After core helium fusion stops, He fuses into carbon in a shell around the carbon core, and H fuses to He in a shell around the helium layer • This double-shell burning stage never reaches equilibrium—fusion rate periodically spikes upward in a series of thermal pulses ...
... • After core helium fusion stops, He fuses into carbon in a shell around the carbon core, and H fuses to He in a shell around the helium layer • This double-shell burning stage never reaches equilibrium—fusion rate periodically spikes upward in a series of thermal pulses ...
... the Orion trapezium). These considerations suggest the possibility that a given trapezium may eject several low-mass stars throughout its lifetime. Scarfe – Are there stars near some of your groups that have not been included in your discussion? If so, there may be some observational selection in yo ...
A rocky planet transiting a nearby low-mass star
... dwarfs tend to show strong Hα emission for about 4"Gyr45; the lack of Hα emission in the HARPS spectrum indicates that GJ 1132 is probably older than that. The star instead shows weak Hα absorption, which is an indicator of non-zero magnetic activity in stars as cool as this46. We detect emission in ...
... dwarfs tend to show strong Hα emission for about 4"Gyr45; the lack of Hα emission in the HARPS spectrum indicates that GJ 1132 is probably older than that. The star instead shows weak Hα absorption, which is an indicator of non-zero magnetic activity in stars as cool as this46. We detect emission in ...
UCAC4 is a compiled, all-sky star catalog covering mainly the 8 to
... The proper motions of bright stars are based on about 140 catalogs,including Hipparcos and Tycho, as well as all catalogs used for the Tycho-2 proper motion construction. Proper motions of faint stars are based on re-reductions of early epoch SPM data (−90 to about −20 deg Dec) and NPM (PMM scans of ...
... The proper motions of bright stars are based on about 140 catalogs,including Hipparcos and Tycho, as well as all catalogs used for the Tycho-2 proper motion construction. Proper motions of faint stars are based on re-reductions of early epoch SPM data (−90 to about −20 deg Dec) and NPM (PMM scans of ...
The birth of stars and planets - School of Physics
... • “The birth of stars and planets” by John Bally and Bo Reipurth (Cambridge, 2006) is a great book for those who’d like to know more about the subject. It’s written by two experts in the field, is entirely non-technical, and has fantastic illustrations all the way through. • “The Story of the Solar ...
... • “The birth of stars and planets” by John Bally and Bo Reipurth (Cambridge, 2006) is a great book for those who’d like to know more about the subject. It’s written by two experts in the field, is entirely non-technical, and has fantastic illustrations all the way through. • “The Story of the Solar ...
Lec2015_22
... • The Sun is a typical Population I star, formed from gas that has experienced a number of generations/cycles of enrichment by massive stars and Type I supernovae. Population I stars comprise the stellar content of the disk of our Galaxy, with ages <9Gyr (white dwarf age for Galactic Disk – Lecture ...
... • The Sun is a typical Population I star, formed from gas that has experienced a number of generations/cycles of enrichment by massive stars and Type I supernovae. Population I stars comprise the stellar content of the disk of our Galaxy, with ages <9Gyr (white dwarf age for Galactic Disk – Lecture ...
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.