Constraining the formation of the Milky Way: Ages
... radial gas flows and the SN-driven galactic winds, possibly resulting in flatter abundance gradients than we currently find. In a forthcoming paper, we show that gas flows are important mostly at the disc boundaries and do not affect significantly the present results, ii) we assume that stars do not ...
... radial gas flows and the SN-driven galactic winds, possibly resulting in flatter abundance gradients than we currently find. In a forthcoming paper, we show that gas flows are important mostly at the disc boundaries and do not affect significantly the present results, ii) we assume that stars do not ...
Measuring the Stars Section 29.2
... emitted per second, or watts. The Sun’s luminosity is about 3.85 × 1026 W. The values for other stars vary widely, from about 0.0001 to more than 1 million times the Sun’s luminosity. No other stellar property varies as much. ...
... emitted per second, or watts. The Sun’s luminosity is about 3.85 × 1026 W. The values for other stars vary widely, from about 0.0001 to more than 1 million times the Sun’s luminosity. No other stellar property varies as much. ...
The extragalactic universe and distance measurements
... • Need to use other distance indicators • A basic method uses apparent brightness… – Suppose you know the true luminosity (“power”) of an object – Can then use measurements of its apparent brightness to determine its distance. – In astronomical context, need to find “standard candles” – objects whos ...
... • Need to use other distance indicators • A basic method uses apparent brightness… – Suppose you know the true luminosity (“power”) of an object – Can then use measurements of its apparent brightness to determine its distance. – In astronomical context, need to find “standard candles” – objects whos ...
Here
... • To get an understanding of how a star works, the most useful thing to do is to measure the spectral energy distribution, which is a plot of the intensity of the photons vs. their wavelengths (or frequencies or energies). • There are two ways to do this: “Broad band”, by taking images with a came ...
... • To get an understanding of how a star works, the most useful thing to do is to measure the spectral energy distribution, which is a plot of the intensity of the photons vs. their wavelengths (or frequencies or energies). • There are two ways to do this: “Broad band”, by taking images with a came ...
Gaps
... The spectroscopic approach POSSIBLE INTERPRETATIONS • Why some blue HB stars are spinning so fast? 1) Angular momentum transferred from the core to the outer envelope: Magnetic braking on MS only affects a star’s envelope (Peterson et al. 1983, Pinsonneault et al. 1991) Problems : Sun (Corbard et a ...
... The spectroscopic approach POSSIBLE INTERPRETATIONS • Why some blue HB stars are spinning so fast? 1) Angular momentum transferred from the core to the outer envelope: Magnetic braking on MS only affects a star’s envelope (Peterson et al. 1983, Pinsonneault et al. 1991) Problems : Sun (Corbard et a ...
Kepler-423b: a half-Jupiter mass planet transiting a very old solar
... The spectroscopic follow-up of Kepler-423 was performed with the FIbre-fed Échelle Spectrograph (FIES; Frandsen & Lindberg 1999; Telting et al. 2014) mounted at the 2.56-m Nordic Optical Telescope (NOT) of Roque de los Muchachos Observatory (La Palma, Spain). The observations were carried out betwee ...
... The spectroscopic follow-up of Kepler-423 was performed with the FIbre-fed Échelle Spectrograph (FIES; Frandsen & Lindberg 1999; Telting et al. 2014) mounted at the 2.56-m Nordic Optical Telescope (NOT) of Roque de los Muchachos Observatory (La Palma, Spain). The observations were carried out betwee ...
The formation of stars and planets
... • One obtains a 2-D problem (instead of 3-D) and higher capture chances. • Can increase formation speed by a factor of 10 or more. Is even effective if only 1% of planetesimals is small enough for shear-dominated regime ...
... • One obtains a 2-D problem (instead of 3-D) and higher capture chances. • Can increase formation speed by a factor of 10 or more. Is even effective if only 1% of planetesimals is small enough for shear-dominated regime ...
EF Eri: Its White Dwarf Primary and L Dwarf Secondary
... magnetic field --> dwarf nova, classical nova, nova-like (IP). These binaries contain an accretion disk. • If the white dwarf has a ~10 to 250MG field --> Polar or AM Herculis type. These contain no accretion disk. ...
... magnetic field --> dwarf nova, classical nova, nova-like (IP). These binaries contain an accretion disk. • If the white dwarf has a ~10 to 250MG field --> Polar or AM Herculis type. These contain no accretion disk. ...
Chapter 2 - personal.kent.edu
... • Predicted the order of the planets – Mercury, Venus, Earth, Mars, Jupiter, Saturn – The only six visible with the naked eye – The Th telescope l had h d not yet been b invented i d ...
... • Predicted the order of the planets – Mercury, Venus, Earth, Mars, Jupiter, Saturn – The only six visible with the naked eye – The Th telescope l had h d not yet been b invented i d ...
Properties of Stars - Montana State University Extended University
... Which of these samples is more representative of the entire population of stars in our galaxy? A representative sample includes all parts of the population of the objects your are investigating in their proper proportions. The relative proportion of common things will be greater than the relative pr ...
... Which of these samples is more representative of the entire population of stars in our galaxy? A representative sample includes all parts of the population of the objects your are investigating in their proper proportions. The relative proportion of common things will be greater than the relative pr ...
The Extragalactic Distance Database: Color–Magnitude Diagrams
... If there are several images per filter available then these values are displayed for each individual image as well as in combination. Hence it is not uncommon for the photometry table to contain more than fifty columns. Though the output is quite complex it breaks into simple sections that are descr ...
... If there are several images per filter available then these values are displayed for each individual image as well as in combination. Hence it is not uncommon for the photometry table to contain more than fifty columns. Though the output is quite complex it breaks into simple sections that are descr ...
Chapter 26.2 notes
... is much closer than other stars. The brightness of a star as it appears from Earth is called its apparent brightness. The apparent brightness of a star decreases as its distance from you increases. ...
... is much closer than other stars. The brightness of a star as it appears from Earth is called its apparent brightness. The apparent brightness of a star decreases as its distance from you increases. ...
No Slide Title
... – Easy to confuse with starspots, binary/triple systems – Needs radial velocity measurements for confirmation, masses Dr. Matt Burleigh ...
... – Easy to confuse with starspots, binary/triple systems – Needs radial velocity measurements for confirmation, masses Dr. Matt Burleigh ...
Unit 3 - Lesson 8.9 Life of Stars Challenge
... At the end of its life, a star swells, loses it outer layers, and then, shrinks Some of the life stages of a star, in somewhat chronological order… ...
... At the end of its life, a star swells, loses it outer layers, and then, shrinks Some of the life stages of a star, in somewhat chronological order… ...
Your Star: _____________________ Write down the wavelength at which the one
... In this exercise, we will use the observed properties (parallax, apparent brightness, and spectrum peak) of some of the well-known stars to calculate, using the formulas and methods discussed in class, their intrinsic properties (temperature, luminosity, and radius.) We will then look for patterns i ...
... In this exercise, we will use the observed properties (parallax, apparent brightness, and spectrum peak) of some of the well-known stars to calculate, using the formulas and methods discussed in class, their intrinsic properties (temperature, luminosity, and radius.) We will then look for patterns i ...
12/08/14-- Student ID ______ TA Name
... 4. Superman left the planet Krypton as an infant 27 years ago just before its destruction. Krypton orbited the star Caph, a spectral type F star. Caph is 54 light years away; thus Superman could have looked back in time and seen his home blow up. Here’s the question: The full spectrum of light was e ...
... 4. Superman left the planet Krypton as an infant 27 years ago just before its destruction. Krypton orbited the star Caph, a spectral type F star. Caph is 54 light years away; thus Superman could have looked back in time and seen his home blow up. Here’s the question: The full spectrum of light was e ...
Down Under from North Florida
... would have difficulty spotting this star. Here Canopus only reaches a maximum altitude of about 3-1/2 degrees over this southern city’s south horizon. Even many Floridian star gazers have never seen this “mysterious star” that rises but 23 degrees east of south and reaches a peak altitude of only 7. ...
... would have difficulty spotting this star. Here Canopus only reaches a maximum altitude of about 3-1/2 degrees over this southern city’s south horizon. Even many Floridian star gazers have never seen this “mysterious star” that rises but 23 degrees east of south and reaches a peak altitude of only 7. ...
`The Seismic Plus` portal`
... • List of stars (use of a cross-identifyer, CDS) • Selection by coordinates + magnitude range • Type of star (main-sequence / red-giant / etc...) • Type of variable star (solar-like pulsator / delta-scuti / etc...) • Other? ...
... • List of stars (use of a cross-identifyer, CDS) • Selection by coordinates + magnitude range • Type of star (main-sequence / red-giant / etc...) • Type of variable star (solar-like pulsator / delta-scuti / etc...) • Other? ...
Ecosystems, from life, to the Earth, to the Galaxy
... hundred light years thick) full of gas and stars, enveloped in a roughly spherical halo, sparsely populated with stars. The spiral shape which attracts our attention, however, is where the galactic ecosystem is at work. Here the process of star formation is active, a process that drives the energy f ...
... hundred light years thick) full of gas and stars, enveloped in a roughly spherical halo, sparsely populated with stars. The spiral shape which attracts our attention, however, is where the galactic ecosystem is at work. Here the process of star formation is active, a process that drives the energy f ...
The Physics of Massive Star Formation
... It is appealing to explain properties of massive stars in terms of massive cores …but if massive cores fragment to many stars, there is no direct core-star mapping, MF agreement is just a coincidence. Do massive cores fragment? ...
... It is appealing to explain properties of massive stars in terms of massive cores …but if massive cores fragment to many stars, there is no direct core-star mapping, MF agreement is just a coincidence. Do massive cores fragment? ...