PLANETS
... This disk around Beta Pictoris is probably connected with a planetary system. The disk does not start at the star. Rather, its inner edge begins around 25 AU away, farther than the average orbital distance of Uranus in the Solar System. Its outer edge appears to extend as far out as 550 AUs away fro ...
... This disk around Beta Pictoris is probably connected with a planetary system. The disk does not start at the star. Rather, its inner edge begins around 25 AU away, farther than the average orbital distance of Uranus in the Solar System. Its outer edge appears to extend as far out as 550 AUs away fro ...
Main-Sequence Stars and the Sun
... relation to the surface temperature of the star is as follows. Hydrogen Balmer lines. Absorption lines caused by hydrogen atoms that are initially in the first excited state (see Chapter 1) are referred to as Balmer lines. At low surface temperatures, most of the hydrogen atoms are in the ground sta ...
... relation to the surface temperature of the star is as follows. Hydrogen Balmer lines. Absorption lines caused by hydrogen atoms that are initially in the first excited state (see Chapter 1) are referred to as Balmer lines. At low surface temperatures, most of the hydrogen atoms are in the ground sta ...
2900 K micrometers T
... equation from page 1. HINT: Estimate the continuous spectrum for each star as demonstrated in class by drawing a “best fit” curve through the spectrum. (4pts) For A7IV: T = ...
... equation from page 1. HINT: Estimate the continuous spectrum for each star as demonstrated in class by drawing a “best fit” curve through the spectrum. (4pts) For A7IV: 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 ...
Chandra Observation of Pulsar Wind Nebula
... Materials ejected by the binary system during its evolution? The mass donor is suggested to be very similar to the Sun but a slightly evolved, it can not contribute to the cloud during its lifetime. The planetary nebula surrounding the exploded white dwarf could be a source of the cloud materia ...
... Materials ejected by the binary system during its evolution? The mass donor is suggested to be very similar to the Sun but a slightly evolved, it can not contribute to the cloud during its lifetime. The planetary nebula surrounding the exploded white dwarf could be a source of the cloud materia ...
Our Local Group of Galaxies
... • For example, the Milky Way has at least 20 dE/dSph companions while M31 most likely has a similar number (still being discovered). • The brightest systems have MV ~ -16 while the faintest have MV ~ -6 (new discoveries even fainter). ...
... • For example, the Milky Way has at least 20 dE/dSph companions while M31 most likely has a similar number (still being discovered). • The brightest systems have MV ~ -16 while the faintest have MV ~ -6 (new discoveries even fainter). ...
JHK standard stars for large telescopes: the UKIRT Fundamental
... from Landolt’s (1983) equatorial UBVRI standards and the compilation of potential Hubble Space Telescope (HST ) reference sources by Turnshek et al. (1990), supplemented by additional main-sequence objects with solar-like colours from the old open cluster M67 (Eggen & Sandage 1964) and subgiants fro ...
... from Landolt’s (1983) equatorial UBVRI standards and the compilation of potential Hubble Space Telescope (HST ) reference sources by Turnshek et al. (1990), supplemented by additional main-sequence objects with solar-like colours from the old open cluster M67 (Eggen & Sandage 1964) and subgiants fro ...
the UKIRT Fundamental and Extended lists
... from Landolt’s (1983) equatorial UBVRI standards and the compilation of potential Hubble Space Telescope (HST ) reference sources by Turnshek et al. (1990), supplemented by additional main-sequence objects with solar-like colours from the old open cluster M67 (Eggen & Sandage 1964) and subgiants fro ...
... from Landolt’s (1983) equatorial UBVRI standards and the compilation of potential Hubble Space Telescope (HST ) reference sources by Turnshek et al. (1990), supplemented by additional main-sequence objects with solar-like colours from the old open cluster M67 (Eggen & Sandage 1964) and subgiants fro ...
ph507weeks1
... parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 1012 stars in our Galaxy. Space observations made by the European Space Agency with the Hipparcos mission (1989-1993) accurately determin ...
... parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 1012 stars in our Galaxy. Space observations made by the European Space Agency with the Hipparcos mission (1989-1993) accurately determin ...
May 2008 - Skyscrapers, Inc.
... minimum and some outdoor lighting gets turned off, leaving the sky less light polluted. You may be the only person for miles around who can really appreciate the beauty such a morning adventure can provide. If you wish to experience firsthand a predawn scenario like that described above, then mark th ...
... minimum and some outdoor lighting gets turned off, leaving the sky less light polluted. You may be the only person for miles around who can really appreciate the beauty such a morning adventure can provide. If you wish to experience firsthand a predawn scenario like that described above, then mark th ...
astro-ph/0303282 PDF
... sensitivity does not vary as a function of azimuth – though sensitivity is significantly lower in the northern offset field of Epsilon Eridani due to poor conditions. The Vega sensitivity limits come from the offset image, which has comparable sensitivity as a function of radius to the centered imag ...
... sensitivity does not vary as a function of azimuth – though sensitivity is significantly lower in the northern offset field of Epsilon Eridani due to poor conditions. The Vega sensitivity limits come from the offset image, which has comparable sensitivity as a function of radius to the centered imag ...
H-Band spectroscopic classification of OB stars
... (BS 7958) and a G9 III (BS 7760). We have no intrinsic spectrum to correct BS 7760 with, so the J and K−band lines were corrected by eye. No correction was made for the H−band Brackett lines in BS 7760. Since BS 7760 was not corrected using a matching intrinsic H spectrum, we are less confident in t ...
... (BS 7958) and a G9 III (BS 7760). We have no intrinsic spectrum to correct BS 7760 with, so the J and K−band lines were corrected by eye. No correction was made for the H−band Brackett lines in BS 7760. Since BS 7760 was not corrected using a matching intrinsic H spectrum, we are less confident in t ...
Dipper, Sword, Snake and Turtle
... Reiner, 1995; Xu/Pankenier/Jiang, 2000; Henderson, 1984). This is why many constellations, the then-known planets and the Sun and Moon were represented by different symbols which had their roots in the respective mythologies of ancient civilizations (dto.). Thus, it is inappropriate—as is done by so ...
... Reiner, 1995; Xu/Pankenier/Jiang, 2000; Henderson, 1984). This is why many constellations, the then-known planets and the Sun and Moon were represented by different symbols which had their roots in the respective mythologies of ancient civilizations (dto.). Thus, it is inappropriate—as is done by so ...
Astronomy 112: The Physics of Stars Class 15 Notes: Stars Before
... many more that we can use, involving both different transitions of CO and of other molecules – thousands have been detected. These clouds are extremely cold, typically around 10 K, mainly because the CO molecules are very efficient at radiating away energy. The clouds are also very dusty, and the du ...
... many more that we can use, involving both different transitions of CO and of other molecules – thousands have been detected. These clouds are extremely cold, typically around 10 K, mainly because the CO molecules are very efficient at radiating away energy. The clouds are also very dusty, and the du ...
Type I SuperNova
... The Type 1 Supernova event is not completely understood Current thinking A – Type 1 Supernova occur only if all of the hydrogen in the outer shells of the companion is transferred to the surface of the dwarf. Helium will then begin to accrete on the surface of the dwarf. Helium requires much higher ...
... The Type 1 Supernova event is not completely understood Current thinking A – Type 1 Supernova occur only if all of the hydrogen in the outer shells of the companion is transferred to the surface of the dwarf. Helium will then begin to accrete on the surface of the dwarf. Helium requires much higher ...
two dozen compact sources and a massive disk
... theoretical papers in 1970s: – First appearance in a paper abstract: M. Disney (1975), “Boundary and Initial Conditions in Protostar Calculations” – First appearance in a paper title: Ferraioli & Virgopia (1979), “On the Mass Distribution Law of Systems of Protocluster Fragments” • Observational pap ...
... theoretical papers in 1970s: – First appearance in a paper abstract: M. Disney (1975), “Boundary and Initial Conditions in Protostar Calculations” – First appearance in a paper title: Ferraioli & Virgopia (1979), “On the Mass Distribution Law of Systems of Protocluster Fragments” • Observational pap ...
The Hipparcos Star Globe Booklet - Cosmos
... cluster, the ‘jaw’ of the bull in the Taurus constellation. The data showed that some of the stars that were apparently part of this cluster were impostors: they are not in fact travelling with the cluster, and over time will part company with its true members. ...
... cluster, the ‘jaw’ of the bull in the Taurus constellation. The data showed that some of the stars that were apparently part of this cluster were impostors: they are not in fact travelling with the cluster, and over time will part company with its true members. ...
High-Mass Star Formation
... Density and Temperature structure of outer envelope characterized
... Density and Temperature structure of outer envelope characterized
= 1.8 (0.4)
= 1.6 (0.5)
...
00 T Tauri Stars Have Extensive Coronae?
... (3) Forbidden lines are often present. (4) In those stars which show an absorption spectrum (from late F to M) Li I A 6707 is present as a strong absorption line. Later, more characteristics have been found for T Tauri stars, e.g. IR excess, "veiling", complex emission li ne profiles and a lot more. ...
... (3) Forbidden lines are often present. (4) In those stars which show an absorption spectrum (from late F to M) Li I A 6707 is present as a strong absorption line. Later, more characteristics have been found for T Tauri stars, e.g. IR excess, "veiling", complex emission li ne profiles and a lot more. ...
The Intricate Role of Cold Gas and Dust in Galaxy Evolution at Early
... …at z>3, no direct measurements are available (below bright end) reason: limited sensitivity/source confusion of submm surveys ! how can we measure dust-obscured part of the cosmic SF history?! ...
... …at z>3, no direct measurements are available (below bright end) reason: limited sensitivity/source confusion of submm surveys ! how can we measure dust-obscured part of the cosmic SF history?! ...
3 - Celestial Sphere
... northern hemisphere, is the Summer Solstice, and the December Solstice, when the Sun is in the southern hemisphere, is the Winter Solstice. 5) The point directly overhead of the observer is called the zenith. The horizon is located 90 degrees away from the observer’s zenith in every direction. If th ...
... northern hemisphere, is the Summer Solstice, and the December Solstice, when the Sun is in the southern hemisphere, is the Winter Solstice. 5) The point directly overhead of the observer is called the zenith. The horizon is located 90 degrees away from the observer’s zenith in every direction. If th ...
Lyra
Lyra (/ˈlaɪərə/; Latin for lyre, from Greek λύρα) is a small constellation. It is one of 48 listed by the 2nd century astronomer Ptolemy, and is one of the 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star maps as a vulture or an eagle carrying a lyre, and hence sometimes referred to as Aquila Cadens or Vultur Cadens. Beginning at the north, Lyra is bordered by Draco, Hercules, Vulpecula, and Cygnus. Lyra is visible from the northern hemisphere from spring through autumn, and nearly overhead, in temperate latitudes, during the summer months. From the southern hemisphere, it is visible low in the northern sky during the winter months.The lucida or brightest star—and one of the brightest stars in the sky—is the white main sequence star Vega, a corner of the Summer Triangle. Beta Lyrae is the prototype of a class of stars known as Beta Lyrae variables, binary stars so close to each other that they become egg-shaped and material flows from one to the other. Epsilon Lyrae, known informally as the Double Double, is a complex multiple star system. Lyra also hosts the Ring Nebula, the second-discovered and best-known planetary nebula.