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... The UFD Reticulum II (Ret II) was recently discovered with Dark Energy Survey data12,13 and confirmed to be one of the most metal-poor galaxies known14. On 1-4 Oct 2015, we obtained high-resolution spectra of the nine brightest member stars in Ret II (see Table 1, Extended Data Figure 1). The abunda ...
... The UFD Reticulum II (Ret II) was recently discovered with Dark Energy Survey data12,13 and confirmed to be one of the most metal-poor galaxies known14. On 1-4 Oct 2015, we obtained high-resolution spectra of the nine brightest member stars in Ret II (see Table 1, Extended Data Figure 1). The abunda ...
Coordinates and Time - University of Florida Astronomy
... The modern standard time is based upon the SI second, which is defined in terms of the oscillations for a particular transition of 133Cs rather than astronomical measures. One second = 9192631770 oscillations. IAT is effectively the atomic equivalent of UT, based upon atomic clocks instead of mean s ...
... The modern standard time is based upon the SI second, which is defined in terms of the oscillations for a particular transition of 133Cs rather than astronomical measures. One second = 9192631770 oscillations. IAT is effectively the atomic equivalent of UT, based upon atomic clocks instead of mean s ...
Milky Way
... Simple Winding – The Wrong Theory •Spiral arms wind up in one cycle •20 cycles since beginning of galaxy •Something else is going on ...
... Simple Winding – The Wrong Theory •Spiral arms wind up in one cycle •20 cycles since beginning of galaxy •Something else is going on ...
27A Stars and Spectroscopy
... So far, the light sources you observed contain only a few elements. However, stars’ atmospheres contain many elements and are much more complex. 1. Use the spectrometer to analyze the light of our closest star—the Sun. Do not point the spectrometer directly at the Sun. Instead, point it at reflected ...
... So far, the light sources you observed contain only a few elements. However, stars’ atmospheres contain many elements and are much more complex. 1. Use the spectrometer to analyze the light of our closest star—the Sun. Do not point the spectrometer directly at the Sun. Instead, point it at reflected ...
Black Holes
... Space Agency is planning a space mission of this sort, called LISA, the Laser Interferometer Space Antenna, and will fly a precursor space mission to test its technology in 2014. (The US space agency NASA used to be a partner in LISA, but was forced to pull out of this and other astrophysics mission ...
... Space Agency is planning a space mission of this sort, called LISA, the Laser Interferometer Space Antenna, and will fly a precursor space mission to test its technology in 2014. (The US space agency NASA used to be a partner in LISA, but was forced to pull out of this and other astrophysics mission ...
A near IR adaptive optics search for faint companions to early
... We suspect that it is a highly reddened (J − K = 2.4) background star. In this region of sky there are other multiple systems with similar proper motions and radial velocities (e.g. HR 3283, 3322, 3359). Therefore, NO Pup belongs to an association. HD 108248/49/50 = α1,2 Cru. The coronographic image ...
... We suspect that it is a highly reddened (J − K = 2.4) background star. In this region of sky there are other multiple systems with similar proper motions and radial velocities (e.g. HR 3283, 3322, 3359). Therefore, NO Pup belongs to an association. HD 108248/49/50 = α1,2 Cru. The coronographic image ...
Searching for the oldest, most metal-poor stars in the SkyMapper Survey
... of a particular star. Figure 4 shows Tef f versus log g for different metallicities and is based on stellar evolution and is called an isochrone. For a star with an estimated temperature, log g could be estimated by finding the log g value that fit on the isochrone at that temperature. ...
... of a particular star. Figure 4 shows Tef f versus log g for different metallicities and is based on stellar evolution and is called an isochrone. For a star with an estimated temperature, log g could be estimated by finding the log g value that fit on the isochrone at that temperature. ...
Global star formation in the Milky Way from the VIALACTEA
... Key-questions in Galactic astronomy • What are the agents determining the star formation rate and history in a normal Galaxy like the Milky Way ? • What are the ingredients determining star formation laws as a function of ISM properties across a full range of galactocentric radii, metallicity and ...
... Key-questions in Galactic astronomy • What are the agents determining the star formation rate and history in a normal Galaxy like the Milky Way ? • What are the ingredients determining star formation laws as a function of ISM properties across a full range of galactocentric radii, metallicity and ...
P10263v1.2 Lab 6 Text
... successfully pick out are the rare, very bright ones. Fortunately, some of these very bright stars belong to a class of stars called Cepheid Variables. Cepheid Variables are typically anywhere from 100 to 10,000 times more luminous than our own Sun, and their brightnesses vary with periods from 1 to ...
... successfully pick out are the rare, very bright ones. Fortunately, some of these very bright stars belong to a class of stars called Cepheid Variables. Cepheid Variables are typically anywhere from 100 to 10,000 times more luminous than our own Sun, and their brightnesses vary with periods from 1 to ...
18 are exactly the same ones as for galactic star clusters of early
... brightest stars. I t is not unreasonable that in a young cluster like this one may find stars with ages ranging from order 107 years to less than 106 years. The very presence of the globules suggests that star formation is still active, despite the presence of several O stars. Are these O stars grad ...
... brightest stars. I t is not unreasonable that in a young cluster like this one may find stars with ages ranging from order 107 years to less than 106 years. The very presence of the globules suggests that star formation is still active, despite the presence of several O stars. Are these O stars grad ...
Stellar Evolution
... rotates, its two spiral arms can compress a GMC, which then leads to star formation. ...
... rotates, its two spiral arms can compress a GMC, which then leads to star formation. ...
NASA`s Juno Mission to Remain in Current Orbit at Jupiter
... • This is a fine week to look for the zodiacal light if you live in the northern latitudes, now that the evening sky is moonless and the ecliptic tilts high upward from the west horizon at nightfall. From a clear, clean, wide-open dark site, look west at twilight's very end for a vague but huge, tal ...
... • This is a fine week to look for the zodiacal light if you live in the northern latitudes, now that the evening sky is moonless and the ecliptic tilts high upward from the west horizon at nightfall. From a clear, clean, wide-open dark site, look west at twilight's very end for a vague but huge, tal ...
The Milky Way: Spiral galaxies:
... absorption. Note that spin flips are classically “forbidden”: on average, a single hydrogen atom will take 107 years to decay! The probability of an absorption is even rarer. •! HI gas mass is directly proportional to 21 cm line intensity •! HI disk is much more extended than optical light, typicall ...
... absorption. Note that spin flips are classically “forbidden”: on average, a single hydrogen atom will take 107 years to decay! The probability of an absorption is even rarer. •! HI gas mass is directly proportional to 21 cm line intensity •! HI disk is much more extended than optical light, typicall ...
WISE General Presentation - Georgia Southern University
... Why Study Infrared? Infrared penetrates intervening dust clouds, allowing us to see through or into them ...
... Why Study Infrared? Infrared penetrates intervening dust clouds, allowing us to see through or into them ...
Full PDF - Royal Society Publishing
... in our galaxy. A large fraction of the stars are likely to harbour rocky planets [1–4]. These discoveries have also profoundly changed our vision of the formation, structure and composition of low-mass planets: while it has been long thought, mostly based on the observations of our own Solar System, ...
... in our galaxy. A large fraction of the stars are likely to harbour rocky planets [1–4]. These discoveries have also profoundly changed our vision of the formation, structure and composition of low-mass planets: while it has been long thought, mostly based on the observations of our own Solar System, ...
T
... The long-term precision of the instrument cannot be checked easily because it requires a long time base on one hand, and the knowledge of stable stellar sources on the other hand. Especially the latter point represents a new challenge since the intrinsic stability of the stars has never been studied ...
... The long-term precision of the instrument cannot be checked easily because it requires a long time base on one hand, and the knowledge of stable stellar sources on the other hand. Especially the latter point represents a new challenge since the intrinsic stability of the stars has never been studied ...
Possible climates on terrestrial exoplanets
... in our galaxy. A large fraction of the stars are likely to harbour rocky planets [1–4]. These discoveries have also profoundly changed our vision of the formation, structure and composition of low-mass planets: while it has been long thought, mostly based on the observations of our own Solar System, ...
... in our galaxy. A large fraction of the stars are likely to harbour rocky planets [1–4]. These discoveries have also profoundly changed our vision of the formation, structure and composition of low-mass planets: while it has been long thought, mostly based on the observations of our own Solar System, ...
infoBIT - Gift Lake School
... (later found to be the outer edges of the planet’s rings), spots on the Sun, moons orbiting Jupiter, and the distinct phases of Venus. Even though Galileo’s discoveries added credibility to the Copernican ideas, the model could still not predict planetary motion very accurately. A German mathematici ...
... (later found to be the outer edges of the planet’s rings), spots on the Sun, moons orbiting Jupiter, and the distinct phases of Venus. Even though Galileo’s discoveries added credibility to the Copernican ideas, the model could still not predict planetary motion very accurately. A German mathematici ...
Hertzsprung Rusell Diagram KLT
... Stars that look to us as though they are near each other, may intact be very far away from each other. Distant but very bright stars look similar to close but dim stars. ...
... Stars that look to us as though they are near each other, may intact be very far away from each other. Distant but very bright stars look similar to close but dim stars. ...
The surface composition of Beta Pictoris
... spectrum. Ti II and Fe II look similar, but the spread is somewhat larger. We suppose that the Cr II gf -values have the highest internal accuracy. The slight residual trend indicated in Fig. 1 is absent in Ti and Fe. Figure 2 shows the strong dependence on line strength that appears if a smaller mi ...
... spectrum. Ti II and Fe II look similar, but the spread is somewhat larger. We suppose that the Cr II gf -values have the highest internal accuracy. The slight residual trend indicated in Fig. 1 is absent in Ti and Fe. Figure 2 shows the strong dependence on line strength that appears if a smaller mi ...
UK Exoplanet community meeting 2017
... perspective of exo-planetary systems, whilst at the same time deepening our knowledge of Earth’s formation. Profound questions still remain as to the origin of Earth’s atmosphere, continents, and habitable climate, questions which are ultimately stymied by having only one natural laboratory in which ...
... perspective of exo-planetary systems, whilst at the same time deepening our knowledge of Earth’s formation. Profound questions still remain as to the origin of Earth’s atmosphere, continents, and habitable climate, questions which are ultimately stymied by having only one natural laboratory in which ...