On the nature and detectability of Type Ib/c supernova progenitors
... wind, following Langer (1989) and Maeder (1990). This correction is particularly large as they employed high WR mass-loss rates for which the effect of wind clumping was not considered (cf. Hamann & Koesterke 1998). As a consequence, the evolutionary tracks of their WR star models have surface tempe ...
... wind, following Langer (1989) and Maeder (1990). This correction is particularly large as they employed high WR mass-loss rates for which the effect of wind clumping was not considered (cf. Hamann & Koesterke 1998). As a consequence, the evolutionary tracks of their WR star models have surface tempe ...
Carbon Stars - The OzSky Star Safari
... area of the HR diagram that we call an 'instability strip' or an 'instability region'. When the star is in this area of the diagram it will become a variable star, one that varies in brightness over time.“ • “Mira stars are red giants (which began as low mass stars), with a temperature less than ...
... area of the HR diagram that we call an 'instability strip' or an 'instability region'. When the star is in this area of the diagram it will become a variable star, one that varies in brightness over time.“ • “Mira stars are red giants (which began as low mass stars), with a temperature less than ...
Astronomy
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solar.gmu.edu
... •A quasar’s luminosity can be calculated from its apparent brightness and the distance using the inverse-square law •Even though small, the luminosity of a quasar (1038 to 1042 Watts) can be very larger, i.e., several thousand times more than the entire Milly Way Galaxies (1037). •A quasar has emiss ...
... •A quasar’s luminosity can be calculated from its apparent brightness and the distance using the inverse-square law •Even though small, the luminosity of a quasar (1038 to 1042 Watts) can be very larger, i.e., several thousand times more than the entire Milly Way Galaxies (1037). •A quasar has emiss ...
Exploring the Variable Sky with the Catalina Real-Time
... Flaring Blazars from CRTS 18 Nov 09 UT: ...
... Flaring Blazars from CRTS 18 Nov 09 UT: ...
Exoplanets
... planet: located 20 light-years away, it may have water on its surface. (eso0722) 2006: Observations show that some objects that are several times the mass of Jupiter have a disc surrounding them and may form in a similar way to stars. It thus becomes much more difficult to define precisely what a ...
... planet: located 20 light-years away, it may have water on its surface. (eso0722) 2006: Observations show that some objects that are several times the mass of Jupiter have a disc surrounding them and may form in a similar way to stars. It thus becomes much more difficult to define precisely what a ...
... change? Well, this increase is primarily due to the humanmade greenhouse gases. Levels of CO2 have increased from around 280 parts per million (ppm) to around 380 ppm now. Studies of ice core show that concentrations of CO2 have not been so high for nearly half a million years. At the current rate o ...
Chapter 17
... The discovery of At the turn of the 20th century astronomers believed the Milky Way other galaxies galaxy was the entire universe. As telescopes got better, though, some “smudges” that were thought to be nebulae in the Milky Way were recognized to be whole galaxies far outside our own. The discovery ...
... The discovery of At the turn of the 20th century astronomers believed the Milky Way other galaxies galaxy was the entire universe. As telescopes got better, though, some “smudges” that were thought to be nebulae in the Milky Way were recognized to be whole galaxies far outside our own. The discovery ...
Starburst Galaxies Under the Microscope: High
... Since the supernova rate is dominated by stars with a mass of about 8 M (the most numerous stars still producing supernovae), which have a lifetime of about 3 10 7 years, the BrG and [Fe II] emission trace phases of the starbursts that are temporally separated by this amount of time. In principle, ...
... Since the supernova rate is dominated by stars with a mass of about 8 M (the most numerous stars still producing supernovae), which have a lifetime of about 3 10 7 years, the BrG and [Fe II] emission trace phases of the starbursts that are temporally separated by this amount of time. In principle, ...
... Allen – This is indeed something to worry about, but I do not believe the discrepancies indicate motion. In the case of ADS 4186E the observations are nearly simultaneous. The last two points refer to measures by Mauray, using CCD astrometry and Mason, using speckle interferometry. Both points are s ...
The cosmic distance scale
... The rotational velocity of a spiral galaxy can be measured from the HI integrated spectrum. The HI gas in a spiral follows very closely circular orbits at a speed Vc . If the galaxy is inclined at an angle i to the line of sight, the observed line of sight velocity will vary from + Vc sin i to - Vc ...
... The rotational velocity of a spiral galaxy can be measured from the HI integrated spectrum. The HI gas in a spiral follows very closely circular orbits at a speed Vc . If the galaxy is inclined at an angle i to the line of sight, the observed line of sight velocity will vary from + Vc sin i to - Vc ...
Teacher`s Guide - Cornell Science Inquiry Partnerships
... d. Accuracy of Measurements. Also discuss with the students how well we can measure the above two properties on the pictures. The number of wrinkles might be possible to count, but only if the photograph has high enough resolution. However, the height of each person might be possible to estimate (e. ...
... d. Accuracy of Measurements. Also discuss with the students how well we can measure the above two properties on the pictures. The number of wrinkles might be possible to count, but only if the photograph has high enough resolution. However, the height of each person might be possible to estimate (e. ...
Zodiac Party Game - Home - DMNS Galaxy Guide Portal
... Stars in the sky appear to be stuck to an inverted transparent bowl. This imaginary shell of lights surrounding the Earth is called the CELESTIAL SPHERE. It contains all the stars, the Sun and Moon, galaxies, planets, comets and other objects. The CELESTIAL SPHERE appears to turn slowly around the E ...
... Stars in the sky appear to be stuck to an inverted transparent bowl. This imaginary shell of lights surrounding the Earth is called the CELESTIAL SPHERE. It contains all the stars, the Sun and Moon, galaxies, planets, comets and other objects. The CELESTIAL SPHERE appears to turn slowly around the E ...
slides - Walter Burke Institute for Theoretical Physics
... Lars Bildsten Kavli Institute for Theoretical ...
... Lars Bildsten Kavli Institute for Theoretical ...
The professional project VEGA/CHARA and participation of ASPA
... The HeI6678 emission lines are a excellent indicator of disk material very close to the photosphere region of the primary component. The lines are showing considerable variations in its V/R ratio. An effect, possibly due of a photospherical outburst, which are creating a eliptical ring, where the ce ...
... The HeI6678 emission lines are a excellent indicator of disk material very close to the photosphere region of the primary component. The lines are showing considerable variations in its V/R ratio. An effect, possibly due of a photospherical outburst, which are creating a eliptical ring, where the ce ...
The Prague Astronomical Clock
... Winter Solstice. This day has the least daylight. The Vernal and Autumnal Equinoxes occur on March 21 and September 23, respectively. On these days, the lengths of day and night are equal. The Ecliptic and the Zodiac As the Earth travels around the Sun, the Sun appears to be rising from a celestial ...
... Winter Solstice. This day has the least daylight. The Vernal and Autumnal Equinoxes occur on March 21 and September 23, respectively. On these days, the lengths of day and night are equal. The Ecliptic and the Zodiac As the Earth travels around the Sun, the Sun appears to be rising from a celestial ...
Physics of Star Formation: Milky Way and Beyond
... show the highest resolution and highest sensitivity polarization images ever made of a Class 0 protostellar source. These new ALMA observations achieve ∼150 AU resolution, allowing us to probe polarization – and thus magnetic field orientation – in the innermost regions surrounding the protostar. Th ...
... show the highest resolution and highest sensitivity polarization images ever made of a Class 0 protostellar source. These new ALMA observations achieve ∼150 AU resolution, allowing us to probe polarization – and thus magnetic field orientation – in the innermost regions surrounding the protostar. Th ...
MSWord version
... standstills (northern and southern) happening about two weeks apart. Note that everything I’ve said about moonrise also applies to moonset, but at Chimney Rock it’s the moonrise in which we’re interested! We might mention that the sunrise and sunset directions also “swing” back and forth across segm ...
... standstills (northern and southern) happening about two weeks apart. Note that everything I’ve said about moonrise also applies to moonset, but at Chimney Rock it’s the moonrise in which we’re interested! We might mention that the sunrise and sunset directions also “swing” back and forth across segm ...
1 Lunar Standstills and Chimney Rock Thomas Hockey To
... standstills (northern and southern) happening about two weeks apart. Note that everything I’ve said about moonrise also applies to moonset, but at Chimney Rock it’s the moonrise in which we’re interested! We might mention that the sunrise and sunset directions also “swing” back and forth across segm ...
... standstills (northern and southern) happening about two weeks apart. Note that everything I’ve said about moonrise also applies to moonset, but at Chimney Rock it’s the moonrise in which we’re interested! We might mention that the sunrise and sunset directions also “swing” back and forth across segm ...
SPECIAL REPORT
... and Neptune. In this model, each planet began with a mass of around 3 Jupiters, which led to cores of less than 18 Earthmasses. Astronomers think the solar system formed in a crowded stellar nursery similar to what we see today in the Orion Nebula. The ultraviolet light of nearby massive stars boile ...
... and Neptune. In this model, each planet began with a mass of around 3 Jupiters, which led to cores of less than 18 Earthmasses. Astronomers think the solar system formed in a crowded stellar nursery similar to what we see today in the Orion Nebula. The ultraviolet light of nearby massive stars boile ...
Refusing to Go Quietly: GRBs and Their Progenitors
... Advanced LIGO will be able to detect gravitational waves that stretch the length of the arms by a fraction of the size of a proton ...
... Advanced LIGO will be able to detect gravitational waves that stretch the length of the arms by a fraction of the size of a proton ...
26.2 Stars - Clinton Public Schools
... the brightest stars in the sky. moving away from Earth. the most massive. ...
... the brightest stars in the sky. moving away from Earth. the most massive. ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.