Chapter 4 Galactic Chemical Evolution
... strengths of lines in a stellar spectrum depend on the abundance of the element responsible, on the effective temperature of the star, on the acceleration due to gravity at its surface and on small-scale turbulence in the atmosphere of the star. All these parameters can be solved for if there are su ...
... strengths of lines in a stellar spectrum depend on the abundance of the element responsible, on the effective temperature of the star, on the acceleration due to gravity at its surface and on small-scale turbulence in the atmosphere of the star. All these parameters can be solved for if there are su ...
Station A Star Charts I
... D6. (2 pts) When modern astronomers redesigned the magnitude system, they set the scale so that every five magnitudes is 100 times brighter (or dimmer, depending on direction). If star A is 1 magnitude brighter than star B, how many times brighter is it? Give your answer to the nearest thousandth. ...
... D6. (2 pts) When modern astronomers redesigned the magnitude system, they set the scale so that every five magnitudes is 100 times brighter (or dimmer, depending on direction). If star A is 1 magnitude brighter than star B, how many times brighter is it? Give your answer to the nearest thousandth. ...
The Probability and Effects of an Asteroid Impact with Earth
... visual limit are also more accurate than those made of bright stars using telescopes, so the ideal observations of δ Cephei are made by eye or binoculars before the eye becomes dark adapted. ...
... visual limit are also more accurate than those made of bright stars using telescopes, so the ideal observations of δ Cephei are made by eye or binoculars before the eye becomes dark adapted. ...
Capturing Heaven - Communicating Astronomy with the Public Journal
... beast, with a fury unmatched. There are many different types of stars, broadly categorised by their colour and size. The colour of a star is determined by its temperature, a result of the ferocity of its fusion reactions and often in direct correlation to ...
... beast, with a fury unmatched. There are many different types of stars, broadly categorised by their colour and size. The colour of a star is determined by its temperature, a result of the ferocity of its fusion reactions and often in direct correlation to ...
Chapter 6: Stellar Evolution (part 2)
... The hotter a star’s core becomes, the higher energy the gamma rays it produces. When the mass of a star exceeds about 100M , the produced gamma rays become so energetic, their interaction with atomic nucleus can lead to the production of electron-position pairs. The pair production decreases the di ...
... The hotter a star’s core becomes, the higher energy the gamma rays it produces. When the mass of a star exceeds about 100M , the produced gamma rays become so energetic, their interaction with atomic nucleus can lead to the production of electron-position pairs. The pair production decreases the di ...
Chandra Automated Point Source Processing
... arranged 2 X 2, for a total field-of-view of 16.9’ X 16.9’. Highly piled-up (bright) sources are apparent with EE radii less than 2.3 arcsec. The curve fits a polynominal of the form, EE = 8e−5 θ2 − 0.01θ + 3.0. By filtering on time or energy we can detect shifts in this fit which indicate any mirro ...
... arranged 2 X 2, for a total field-of-view of 16.9’ X 16.9’. Highly piled-up (bright) sources are apparent with EE radii less than 2.3 arcsec. The curve fits a polynominal of the form, EE = 8e−5 θ2 − 0.01θ + 3.0. By filtering on time or energy we can detect shifts in this fit which indicate any mirro ...
New Mass Loss Measurements from Astrospheric Lyα Absorption
... Paper I and in Wood (2004). Briefly, hydrodynamic models of the astrospheres, constrained by the VISM values in Table 1, are computed using a four-fluid code developed to model the heliosphere and reproduce the observed heliospheric Lya absorption (Zank et al. 1996; Wood et al. 2000). Models with di ...
... Paper I and in Wood (2004). Briefly, hydrodynamic models of the astrospheres, constrained by the VISM values in Table 1, are computed using a four-fluid code developed to model the heliosphere and reproduce the observed heliospheric Lya absorption (Zank et al. 1996; Wood et al. 2000). Models with di ...
THE N/O RATIO IN EARLY B-TYPE MAIN SEQUENCE STARS AS
... This paper is based on previous studies of MS B-stars which were published between 2000 and 2008 by Lyubimkov, et al. [8-12]. High resolution spectra for more than 100 MS B-stars were obtained [8] at two observatories, the Crimean Astrophysical Observatory and the MacDonald Observatory of the Unive ...
... This paper is based on previous studies of MS B-stars which were published between 2000 and 2008 by Lyubimkov, et al. [8-12]. High resolution spectra for more than 100 MS B-stars were obtained [8] at two observatories, the Crimean Astrophysical Observatory and the MacDonald Observatory of the Unive ...
ppt
... few galaxies (1-2 Mpc). Even Hubble Space Telescope cannot find Cepheids beyond the Virgo cluster (16 Mpc). Beyond 1-2Mpc, Hubble used… ...
... few galaxies (1-2 Mpc). Even Hubble Space Telescope cannot find Cepheids beyond the Virgo cluster (16 Mpc). Beyond 1-2Mpc, Hubble used… ...
THE CONSTELLATION OCTANS, THE OCTANT
... The constellation used several stars from Hydrus. The octant instrument provided a number of advantages over previous instruments. The sight was easy to align because the horizon and the star seem to move together as the ship pitched and rolled. This also created a situation where the error in obser ...
... The constellation used several stars from Hydrus. The octant instrument provided a number of advantages over previous instruments. The sight was easy to align because the horizon and the star seem to move together as the ship pitched and rolled. This also created a situation where the error in obser ...
CONSTELLATIONS OF THE SOUTHERN SKY VOLANS
... Created by Bayer in 1603, this constellation used to be called PiscisVolans, the Flying Fish, before it was shortened to Volans. Volans was one of the 12 new constellations introduced at the end of the 16th century by the Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman. Volans repr ...
... Created by Bayer in 1603, this constellation used to be called PiscisVolans, the Flying Fish, before it was shortened to Volans. Volans was one of the 12 new constellations introduced at the end of the 16th century by the Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman. Volans repr ...
Review 3 (11-18-10)
... • White Dawrfs: very dense, about mass of Sun in size of Earth. Atoms stop further collapse. M less than 1.4 solar masses • Neutron Stars: even denser, about mass of Sun in size of Orlando. Neutrons stop further collapse. M between 1.4 and 3 solar masses. Some neutron stars can be detected as pulsar ...
... • White Dawrfs: very dense, about mass of Sun in size of Earth. Atoms stop further collapse. M less than 1.4 solar masses • Neutron Stars: even denser, about mass of Sun in size of Orlando. Neutrons stop further collapse. M between 1.4 and 3 solar masses. Some neutron stars can be detected as pulsar ...
The HERMES GALAH survey: overview
... simulations predict a high level of merger activity, which conflicts with some observed properties of disk galaxies. and it may be possible to put observational limits on the satellite accretion history of the Galaxy using chemical techniques. This kind of chemical tagging experiment needs a high re ...
... simulations predict a high level of merger activity, which conflicts with some observed properties of disk galaxies. and it may be possible to put observational limits on the satellite accretion history of the Galaxy using chemical techniques. This kind of chemical tagging experiment needs a high re ...
An introduction to photometry and photometric measurements Henry
... sections of 10 0 ; 10 0 , and each section is covered by an image of size 4096 ; 4096 pixels with a pixel scale of 0.1500 . Therefore, adjacent tiles overlap each other by 14.400 on all sides. As a result, the vast majority of objects can be analyzed on a single image. The layout of the image tiles ...
... sections of 10 0 ; 10 0 , and each section is covered by an image of size 4096 ; 4096 pixels with a pixel scale of 0.1500 . Therefore, adjacent tiles overlap each other by 14.400 on all sides. As a result, the vast majority of objects can be analyzed on a single image. The layout of the image tiles ...
Neon abundances - UCL Astrophysics Group
... Explorer (IUE) on the ultraviolet resonance lines of iron-peak elements in 26 HgMn, four superficially normal and 10 normal stars. We observed definite detections or determined upper limits for Ne i in 21 of the HgMn stars in the Smith & Dworetsky (1993) sample, and in 11 of the normal and superfici ...
... Explorer (IUE) on the ultraviolet resonance lines of iron-peak elements in 26 HgMn, four superficially normal and 10 normal stars. We observed definite detections or determined upper limits for Ne i in 21 of the HgMn stars in the Smith & Dworetsky (1993) sample, and in 11 of the normal and superfici ...
Atoms and Stars IST 3360 and IST 1990
... Brahe’s data, getting paid, etc. (Tengnagle) • Broke with King, didn’t give edition to King but sold it to publishers in lieu of ...
... Brahe’s data, getting paid, etc. (Tengnagle) • Broke with King, didn’t give edition to King but sold it to publishers in lieu of ...
Talk
... - We have identified 18 PCEBs and PCEB candidates among a sample of 101 WDMS for which repeat SDSS spectroscopic observations are available. - From the SDSS spectra we determine Sp of the companions, Teff, M, log(g) of the WDs, as well as distance estimates to the systems. Even though some of the st ...
... - We have identified 18 PCEBs and PCEB candidates among a sample of 101 WDMS for which repeat SDSS spectroscopic observations are available. - From the SDSS spectra we determine Sp of the companions, Teff, M, log(g) of the WDs, as well as distance estimates to the systems. Even though some of the st ...
Powerpoint Review
... brightness of a star as it appears from the earth, without the effect of the earth’s atmosphere, is called apparent magnitude . Since the earth’s atmosphere causes stars to look different, the apparent magnitude takes this effect out. If we could take two stars and put them side by side, we could te ...
... brightness of a star as it appears from the earth, without the effect of the earth’s atmosphere, is called apparent magnitude . Since the earth’s atmosphere causes stars to look different, the apparent magnitude takes this effect out. If we could take two stars and put them side by side, we could te ...
Chapter 5: Telescopes - University of Texas Astronomy Home Page
... present-day large-baseline interferometers: The VLA and the VLBA VLBA=effective size ~ half of U.S. ...
... present-day large-baseline interferometers: The VLA and the VLBA VLBA=effective size ~ half of U.S. ...
The Next 2-3 Weeks
... • What is a metric? • The Schwarzschild metric (= non-rotating black hole) • “The orbit of a satellite” (somewhat flakey example) I will present additional material assuming that you have read at least 17.2. ...
... • What is a metric? • The Schwarzschild metric (= non-rotating black hole) • “The orbit of a satellite” (somewhat flakey example) I will present additional material assuming that you have read at least 17.2. ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.