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Which planet has never been orbited or flown past by a
... ASTRONOMY COURSE Dr. C. Renee James NASA Top Stars 2010 ...
... ASTRONOMY COURSE Dr. C. Renee James NASA Top Stars 2010 ...
MPhil Thesis - Final - Suzanne Knight
... white dwarfs make them ideal candidates for detecting low mass objects such as brown dwarfs and gas giant planets. ! Theoretical predictions generally agree that a star will consume and destroy close-in, low mass planets as it ascends the red giant and asymptotic giant branch evolutionary tracks, bu ...
... white dwarfs make them ideal candidates for detecting low mass objects such as brown dwarfs and gas giant planets. ! Theoretical predictions generally agree that a star will consume and destroy close-in, low mass planets as it ascends the red giant and asymptotic giant branch evolutionary tracks, bu ...
Process of Science: PreMainSequence Stellar Life Tracks on the HR
... If you watch the position of the red dot on the HR diagram as the interactive figure plays, you will see that the dot is highest — meaning the object is most luminous— when it is a protostar and therefore does not yet have internal fusion. This fact can be a little surprising, but do not forget tha ...
... If you watch the position of the red dot on the HR diagram as the interactive figure plays, you will see that the dot is highest — meaning the object is most luminous— when it is a protostar and therefore does not yet have internal fusion. This fact can be a little surprising, but do not forget tha ...
Improved stellar parameters of CoRoT-7
... In Fig. 3 we show an example of the abundances of six elements determined for the H1–107 spectrum. The mean abundance and rms error is given in the right panels. While Fe has the most lines, Ti, Cr and Ni also show no strong correlation with equivalent with or excitation potential. The atmospheric p ...
... In Fig. 3 we show an example of the abundances of six elements determined for the H1–107 spectrum. The mean abundance and rms error is given in the right panels. While Fe has the most lines, Ti, Cr and Ni also show no strong correlation with equivalent with or excitation potential. The atmospheric p ...
ATLAS lifts the Cup: discovery of a new Milky Way satellite in Crater⋆†
... from blending problems to some extent. Therefore, in the following analysis we use two versions of the WHT stellar catalogues. First, the most stringent sample (sample A) is created by requiring that each object is classified as stellar in both r and i frames. This produces clean photometry across t ...
... from blending problems to some extent. Therefore, in the following analysis we use two versions of the WHT stellar catalogues. First, the most stringent sample (sample A) is created by requiring that each object is classified as stellar in both r and i frames. This produces clean photometry across t ...
Stellar Lifetimes
... Pressure and gravity in balance Stars attempt to maintain equilibrium by striking a balance between the gravity of their enormous mass and the pressure produced by the energy of fusion reactions. A main sequence star is in equilibrium as Hydrogen burning supports it against gravitational collapse. W ...
... Pressure and gravity in balance Stars attempt to maintain equilibrium by striking a balance between the gravity of their enormous mass and the pressure produced by the energy of fusion reactions. A main sequence star is in equilibrium as Hydrogen burning supports it against gravitational collapse. W ...
A COMPREHENSIVE COMPARISON OF THE SUN TO
... subtle factors that have some influence over habitability, a quantitative joint analysis of the Sun’s properties may allow us to identify these factors without invoking largely speculative arguments linking specific properties to habitability. With respect to problem 2, most previous analyses have c ...
... subtle factors that have some influence over habitability, a quantitative joint analysis of the Sun’s properties may allow us to identify these factors without invoking largely speculative arguments linking specific properties to habitability. With respect to problem 2, most previous analyses have c ...
1 Discovery of peculiar periodic spectral
... the Fourier continuum as discussed in section 2. We could therefore have assumed that all the detections are due to the effect of noise; however if this were the case the detections would be uniformly distributed, within reasonable statistical fluctuation boundaries, as a function of the sampling nu ...
... the Fourier continuum as discussed in section 2. We could therefore have assumed that all the detections are due to the effect of noise; however if this were the case the detections would be uniformly distributed, within reasonable statistical fluctuation boundaries, as a function of the sampling nu ...
Chemical composition of B-type supergiants in the OB8, OB10
... of the Si IV lines being marginal. Indeed a later spectral-type, such as B2Ia, would also be compatible with the data. OB78-277 and OB78-478: These two M31 targets are considered together as they have similar spectra, corresponding to spectral types of B1-2Ia. Indeed both spectra match well that of ...
... of the Si IV lines being marginal. Indeed a later spectral-type, such as B2Ia, would also be compatible with the data. OB78-277 and OB78-478: These two M31 targets are considered together as they have similar spectra, corresponding to spectral types of B1-2Ia. Indeed both spectra match well that of ...
Star 1 A star is a massive, luminous ball of plasma held together by
... From this he deduced that the number of stars steadily increased toward one side of the sky, in the direction of the Milky Way core. His son John Herschel repeated this study in the southern hemisphere and found a corresponding increase in the same direction.[28] In addition to his other accomplishm ...
... From this he deduced that the number of stars steadily increased toward one side of the sky, in the direction of the Milky Way core. His son John Herschel repeated this study in the southern hemisphere and found a corresponding increase in the same direction.[28] In addition to his other accomplishm ...
The Sun
... There are only a handful of meteorites (5 according to Lodders 2003) used for these measurements CI carbonaceous chondrites are used ...
... There are only a handful of meteorites (5 according to Lodders 2003) used for these measurements CI carbonaceous chondrites are used ...
Article PDF - IOPscience
... for each detected source, namely, the “object type” (stellar, extended, bad star, etc.), the χ 2 , which simply gives the quality of the PSF fit, the “sharpness” used to eliminate cosmic rays and extended objects, the “roundness,” the S/N, and a “crowding” parameter that describes the change in star ...
... for each detected source, namely, the “object type” (stellar, extended, bad star, etc.), the χ 2 , which simply gives the quality of the PSF fit, the “sharpness” used to eliminate cosmic rays and extended objects, the “roundness,” the S/N, and a “crowding” parameter that describes the change in star ...
CFBDSIR J1458+ 1013B: A Very Cold (> T10) Brown Dwarf in a
... on Mauna Kea, Hawai‘i. We used the facility wide-field near-IR camera WIRCam (Puget et al. 2004), which has four 2048×2048 Hawaii-2RG detectors, each with an approximate field-of-view of 10′ × 10′ . At each epoch, we placed the target near the center of the northeast detector. The data were taken wi ...
... on Mauna Kea, Hawai‘i. We used the facility wide-field near-IR camera WIRCam (Puget et al. 2004), which has four 2048×2048 Hawaii-2RG detectors, each with an approximate field-of-view of 10′ × 10′ . At each epoch, we placed the target near the center of the northeast detector. The data were taken wi ...
Stellar populations in the nuclear regions of nearby radio galaxies
... the variations are correlated with the position at which the telescope is pointing. Since flat-fielding is crucial for the reddest wavelengths, where the sky lines are most prominent, after every exposure of 20–30 min we acquired a flat-field in the same position of the telescope as the one for whic ...
... the variations are correlated with the position at which the telescope is pointing. Since flat-fielding is crucial for the reddest wavelengths, where the sky lines are most prominent, after every exposure of 20–30 min we acquired a flat-field in the same position of the telescope as the one for whic ...
12-1 - Piscataway High School
... would have at some standard distance. Astronomers have adopted 10 pc as the standard distance and refer to the apparent visual magnitude a star would have if it were 10 pc away as its absolute visual magnitude (MV). This is an expression of the intrinsic brightness of the star. The symbol for absolu ...
... would have at some standard distance. Astronomers have adopted 10 pc as the standard distance and refer to the apparent visual magnitude a star would have if it were 10 pc away as its absolute visual magnitude (MV). This is an expression of the intrinsic brightness of the star. The symbol for absolu ...
Carbon-enhanced metal-poor stars in dwarf galaxies
... log(L/L# ) < 4.0 (shown in Fig. 1 with red circles), are from high-resolution spectroscopic studies (see caption for references). Although less than 20 stars have been observed in these 4 systems, the overall frequency of CEMP-no stars is very high, and at [Fe/H]≤ −3, 5 out of 6 stars are CEMP-no st ...
... log(L/L# ) < 4.0 (shown in Fig. 1 with red circles), are from high-resolution spectroscopic studies (see caption for references). Although less than 20 stars have been observed in these 4 systems, the overall frequency of CEMP-no stars is very high, and at [Fe/H]≤ −3, 5 out of 6 stars are CEMP-no st ...
Radial Velocity - Yale Exoplanet
... Since the end of the XIXth century, radial velocities have been at the heart of many developments and advances in astrophysics. In 1888, Vogel at Potsdam used photography to demonstrate Christian Dopplers theory (in 1842) that stars in motion along our line of site would exhibit a change in color. T ...
... Since the end of the XIXth century, radial velocities have been at the heart of many developments and advances in astrophysics. In 1888, Vogel at Potsdam used photography to demonstrate Christian Dopplers theory (in 1842) that stars in motion along our line of site would exhibit a change in color. T ...
The GL 569 Multiple System
... GL 569 A. This offset of B with respect to A lies ∼1′′ from that measured by Forrest et al. (1988) (Table 3, Figure 1) and confirms their finding that A and B form a common proper motion system. Our measurement, taken together with the positions measured by Martı́n et al. (2000) and Lane et al. (200 ...
... GL 569 A. This offset of B with respect to A lies ∼1′′ from that measured by Forrest et al. (1988) (Table 3, Figure 1) and confirms their finding that A and B form a common proper motion system. Our measurement, taken together with the positions measured by Martı́n et al. (2000) and Lane et al. (200 ...
On the elemental abundance and isotopic mixture of mercury in
... (1998, 2003) analysed nearly 20 late-B and A type main sequence stars by line profile analysis and finds ξ t < 1 km s−1 for T eff > 10 000 K but values of up to 5 km s −1 for the A stars. During the early stages of our study it was noted that the three mercury lines behave differently as ξ t is change ...
... (1998, 2003) analysed nearly 20 late-B and A type main sequence stars by line profile analysis and finds ξ t < 1 km s−1 for T eff > 10 000 K but values of up to 5 km s −1 for the A stars. During the early stages of our study it was noted that the three mercury lines behave differently as ξ t is change ...
Gaia talk
... Trend: stellar orbit Galactic dynamics, dark matter, assembly history, ... Cycloid: parallax = 1/distance Galactic structure, star formation history Loops: high frequency motion massive planetary systems ...
... Trend: stellar orbit Galactic dynamics, dark matter, assembly history, ... Cycloid: parallax = 1/distance Galactic structure, star formation history Loops: high frequency motion massive planetary systems ...
Conference Abstract Booklet here.
... and OGLE team Blazhko effect is a long-term quasi-periodic amplitude and/or phase modulation of pulsations of RR Lyrae stars. After its discovery in 1907 by Sergey Blazhko, its origin remains a mystery. This phenomenon has not been extensively studied in firstovertone (RRc) RR Lyrae stars yet. The O ...
... and OGLE team Blazhko effect is a long-term quasi-periodic amplitude and/or phase modulation of pulsations of RR Lyrae stars. After its discovery in 1907 by Sergey Blazhko, its origin remains a mystery. This phenomenon has not been extensively studied in firstovertone (RRc) RR Lyrae stars yet. The O ...
ISA_lecture01 - School of Physics
... vastly, hugely, mind-bogglingly big it is. I mean, you may think it’s a long way down the road to the chemist, but that’s just peanuts to space.” Douglas Adams, The Hitchhiker’s Guide to the Galaxy ...
... vastly, hugely, mind-bogglingly big it is. I mean, you may think it’s a long way down the road to the chemist, but that’s just peanuts to space.” Douglas Adams, The Hitchhiker’s Guide to the Galaxy ...
Chapter 12
... how hot a star is, they must once more rely on indirect methods. Yet the method used is familiar. You use it yourself in judging the temperature of an electric stove burner. An object’s temperature can often be deduced from the color of its emitted light. As we saw in chapter 3, hotter objects emit ...
... how hot a star is, they must once more rely on indirect methods. Yet the method used is familiar. You use it yourself in judging the temperature of an electric stove burner. An object’s temperature can often be deduced from the color of its emitted light. As we saw in chapter 3, hotter objects emit ...
- ANU Repository
... of values that can include non-trivial priors on parameters. Silburt et al. (2015) pointed out that because of detection bias, errors in radii of small planets will not be symmetric: observed values are more likely to be underestimates of a larger value than overestimates of a smaller value. Importa ...
... of values that can include non-trivial priors on parameters. Silburt et al. (2015) pointed out that because of detection bias, errors in radii of small planets will not be symmetric: observed values are more likely to be underestimates of a larger value than overestimates of a smaller value. Importa ...
Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Light from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors interspersed with absorption lines. Each line indicates an ion of a certain chemical element, with the line strength indicating the abundance of that ion. The relative abundance of the different ions varies with the temperature of the photosphere. The spectral class of a star is a short code summarizing the ionization state, giving an objective measure of the photosphere's temperature and density.Most stars are currently classified under the Morgan–Keenan (MK) system using the letters O, B, A, F, G, K, and M, a sequence from the hottest (O type) to the coolest (M type). Each letter class is then subdivided using a numeric digit with 0 being hottest and 9 being coolest (e.g. A8, A9, F0, F1 form a sequence from hotter to cooler). The sequence has been expanded with classes for other stars and star-like objects that do not fit in the classical system, such class D for white dwarfs and class C for carbon stars.In the MK system a luminosity class is added to the spectral class using Roman numerals. This is based on the width of certain absorption lines in the star's spectrum which vary with the density of the atmosphere and so distinguish giant stars from dwarfs. Luminosity class 0 or Ia+ stars for hypergiants, class I stars for supergiants, class II for bright giants, class III for regular giants, class IV for sub-giants, class V for main-sequence stars, class sd for sub-dwarfs, and class D for white dwarfs. The full spectral class for the Sun is then G2V, indicating a main-sequence star with a temperature around 5,800K.