ASTRONOMY 113 Laboratory Lab 5: Spectral Classification of the
... Some of the most beautiful objects in the sky are star clusters, groups of stars ranging in number from a few hundreds of stars ("open clusters") to a few million stars ("globular star clusters"). All of the stars in these clusters are bound to each other by gravity. Star clusters are also valuable ...
... Some of the most beautiful objects in the sky are star clusters, groups of stars ranging in number from a few hundreds of stars ("open clusters") to a few million stars ("globular star clusters"). All of the stars in these clusters are bound to each other by gravity. Star clusters are also valuable ...
Red Dwarf Stars: Ages, Rotation, Magnetic
... pre-main sequence stars and close binaries in the sample. Also in this study, we exclude spectral types later than ∼M7 because they appear to have Age-Rotation-Activity relations quite different to earlier spectral types. From a limited sample of M7–9 V stars, it appears that they do not undergo mag ...
... pre-main sequence stars and close binaries in the sample. Also in this study, we exclude spectral types later than ∼M7 because they appear to have Age-Rotation-Activity relations quite different to earlier spectral types. From a limited sample of M7–9 V stars, it appears that they do not undergo mag ...
Stellar Explosions
... Nickel-56 is unstable and quickly decays to cobalt-56 which subsequently decays into iron-56 Iron-56 is the most stable nucleus, so it neither fuses nor decays Within the cores of the most massive stars, neutron capture can create heavier elements, all the way up to bismuth-209 The heaviest elements ...
... Nickel-56 is unstable and quickly decays to cobalt-56 which subsequently decays into iron-56 Iron-56 is the most stable nucleus, so it neither fuses nor decays Within the cores of the most massive stars, neutron capture can create heavier elements, all the way up to bismuth-209 The heaviest elements ...
Devil physics The baddest class on campus IB Physics
... Apparent magnitude is based on view from earth Two stars may have the same apparent ...
... Apparent magnitude is based on view from earth Two stars may have the same apparent ...
PDF - ASSA
... units apart, and given that they are each around nine solar masses the orbital period must be at least 20 000 years. But there is more! Located just 5' south-east is the fainter, wider, more-equal pair HJ 4252, which shares the field with upsilon in a 150-mm f/8 refractor at 136x. This second set con ...
... units apart, and given that they are each around nine solar masses the orbital period must be at least 20 000 years. But there is more! Located just 5' south-east is the fainter, wider, more-equal pair HJ 4252, which shares the field with upsilon in a 150-mm f/8 refractor at 136x. This second set con ...
1 Introduction - University of Amsterdam
... star phase in which they expel the main part of their outer envelopes. Once the compact helium core is revealed it is identified as a Wolf-Rayet star. The supernova progenitor state (at the top of the diagram) determines the characteristics of the final explosion and therefore also the nature of the ...
... star phase in which they expel the main part of their outer envelopes. Once the compact helium core is revealed it is identified as a Wolf-Rayet star. The supernova progenitor state (at the top of the diagram) determines the characteristics of the final explosion and therefore also the nature of the ...
PHYS_3380_082615_bw - The University of Texas at Dallas
... them to tell what month it is. For example, Scorpius is only visible in the northern hemisphere's evening sky in the summer. - many of the myths associated with the constellations thought to have been invented to help the farmers remember them - made up stories about them ...
... them to tell what month it is. For example, Scorpius is only visible in the northern hemisphere's evening sky in the summer. - many of the myths associated with the constellations thought to have been invented to help the farmers remember them - made up stories about them ...
8-4.9 - S2TEM Centers SC
... Some incorrect believes children often hold include but are not limited to: The planets are relatively similar in size to the Sun and are relatively close in distance to one another. (The diameters of the planets are vastly different. The distances between the last five planets are much greater th ...
... Some incorrect believes children often hold include but are not limited to: The planets are relatively similar in size to the Sun and are relatively close in distance to one another. (The diameters of the planets are vastly different. The distances between the last five planets are much greater th ...
16_Testbank
... Note that this is much larger than the balance mass in the cooler clouds that we see today. The early universe clouds that did not have any other molecules to cool them down, required very large masses to collapse. Consequently, they probably produced very massive stars. 6) Why does a cloud collapse ...
... Note that this is much larger than the balance mass in the cooler clouds that we see today. The early universe clouds that did not have any other molecules to cool them down, required very large masses to collapse. Consequently, they probably produced very massive stars. 6) Why does a cloud collapse ...
Document
... galaxy can be estimated by measuring its infrared power. Space telescopes such as the Infrared Astronomical Satellite (IRAS, in the mid-1980s) and the Infrared Space Observatory (ISO, in the mid-1990s) were very useful for this kind of work, and it is being continued with the infrared camera on the ...
... galaxy can be estimated by measuring its infrared power. Space telescopes such as the Infrared Astronomical Satellite (IRAS, in the mid-1980s) and the Infrared Space Observatory (ISO, in the mid-1990s) were very useful for this kind of work, and it is being continued with the infrared camera on the ...
Deep Chandra Observations of the Arches and Quintuplet Clusters at... Hui Dong Q. Daniel Wang ( &
... contamination of faint undetected point-like sources could be upto ∼ 65%, but mostly at energies ≤ 4 keV. The remaining diffuse emission can be characterized by a plasma with a temperature of ∼ 5 × 107 K. The 0.3-8 keV luminosity of the emission is 1.6×1033 ergs s−1 for Quintuplet and 7.7×1033 ergs ...
... contamination of faint undetected point-like sources could be upto ∼ 65%, but mostly at energies ≤ 4 keV. The remaining diffuse emission can be characterized by a plasma with a temperature of ∼ 5 × 107 K. The 0.3-8 keV luminosity of the emission is 1.6×1033 ergs s−1 for Quintuplet and 7.7×1033 ergs ...
Spectral classification of O–M stars on the basis of UBV photometry
... analyzed stars have been assigned to a single or two rather close estimates of spectra. In the last case an average value was adopted. Another 40% of stars have obtained two substantially different estimates of spectra. Double results of the classifying process based on U BV data originates as a rul ...
... analyzed stars have been assigned to a single or two rather close estimates of spectra. In the last case an average value was adopted. Another 40% of stars have obtained two substantially different estimates of spectra. Double results of the classifying process based on U BV data originates as a rul ...
Galactic Archaeology: Current Surveys
... 10 km/s. The values of the stellar atmospheric parameters are obtained through a dedicated pipeline (Lee et al. 2008), developed for the broad range of targets and giving metallicity estimates to ∼ 0.2 dex, and for high signal-to-noise spectra, an estimate of the relative abundance of the ‘alpha-ele ...
... 10 km/s. The values of the stellar atmospheric parameters are obtained through a dedicated pipeline (Lee et al. 2008), developed for the broad range of targets and giving metallicity estimates to ∼ 0.2 dex, and for high signal-to-noise spectra, an estimate of the relative abundance of the ‘alpha-ele ...
THE PROPERTIES OF MAIN-SEQUENCE STARS - Cosmos
... in the Michigan catalogues and (ii) had spectroscopic parallaxes that placed them within 80 pc of the Sun. Of these, 3727 are well determined as luminosity class V and actually lie within 100 pc. From this subsample we can determine the distribution in MV of mainsequence stars of given spectral type ...
... in the Michigan catalogues and (ii) had spectroscopic parallaxes that placed them within 80 pc of the Sun. Of these, 3727 are well determined as luminosity class V and actually lie within 100 pc. From this subsample we can determine the distribution in MV of mainsequence stars of given spectral type ...
PowerPoint
... • These are objects that are below 80 Jupiter masses. • The central density and temperature do not get large enough for nuclear fusion to occur. • These failed stars, gradually cool down and contract. • Recently, there have been a number of discovered brown dwarves. ...
... • These are objects that are below 80 Jupiter masses. • The central density and temperature do not get large enough for nuclear fusion to occur. • These failed stars, gradually cool down and contract. • Recently, there have been a number of discovered brown dwarves. ...
1 Pau Amaro Seoane - modest 15-s
... the Universe. With typical masses of 107 to 108 solar masses and half-mass radii between 10 to 100 pc they are more than a factor 1000 denser than dwarf galaxies of the same mass. They also show evidence for elevated mass-to-light ratios, which could be due to the presence of massive black holes or ...
... the Universe. With typical masses of 107 to 108 solar masses and half-mass radii between 10 to 100 pc they are more than a factor 1000 denser than dwarf galaxies of the same mass. They also show evidence for elevated mass-to-light ratios, which could be due to the presence of massive black holes or ...
Interpretation of the Helix Planetary Nebula using Hydro
... HGD, most planetary nebulae contain ≈ 100M of unevaporated JPPs by assuming a PNe size of 2 × 1016 m and a BDM density in star forming regions of 2 × 10−17 kg m−3 . Less than 10% of these JPPs must be evaporated and ionized to form the unexpectedly massive stellar envelopes in place rather than eje ...
... HGD, most planetary nebulae contain ≈ 100M of unevaporated JPPs by assuming a PNe size of 2 × 1016 m and a BDM density in star forming regions of 2 × 10−17 kg m−3 . Less than 10% of these JPPs must be evaporated and ionized to form the unexpectedly massive stellar envelopes in place rather than eje ...
ULXs: General Properties and Variability - X
... •evidence against beaming (QPOs, broad Fe Lines, eclipses) •At least one object has a break in the PDS at the frequency predicted for M~1000M objects •Associated extended radio sources •General lack of optical Ids (massive stars would be seen) •they lie near, but not in star forming regions Kyoto me ...
... •evidence against beaming (QPOs, broad Fe Lines, eclipses) •At least one object has a break in the PDS at the frequency predicted for M~1000M objects •Associated extended radio sources •General lack of optical Ids (massive stars would be seen) •they lie near, but not in star forming regions Kyoto me ...
Multiwavelength properties of γ-ray loud binary systems.
... PSR J1413-6205, emitting pulsed γ-ray emission in the 0.1-10 GeV band. PSR B1259-63 is not visible in the three year countmap, but appears as a very bright excess in the variability map. ...
... PSR J1413-6205, emitting pulsed γ-ray emission in the 0.1-10 GeV band. PSR B1259-63 is not visible in the three year countmap, but appears as a very bright excess in the variability map. ...
Galaxy formation in the Planck cosmology - II. Star
... Voort (2015). The difference between the two reflects the merger history of galaxies. The term SFH is often loosely used in papers without being defined. Observationally, the only direct measure of SFHs corresponds to that described in this paper, i.e. the distribution of formation times of all the ...
... Voort (2015). The difference between the two reflects the merger history of galaxies. The term SFH is often loosely used in papers without being defined. Observationally, the only direct measure of SFHs corresponds to that described in this paper, i.e. the distribution of formation times of all the ...
ASTRO-114--Lecture 47-
... drawing before I tell you about the weird results. If you look at this drawing you can see that a lot of the galaxy is in the center. It seems to be concentrated at the center. Well, that’s what we measure. There’s a lot of material near the center. But there’s also some material out in these spiral ...
... drawing before I tell you about the weird results. If you look at this drawing you can see that a lot of the galaxy is in the center. It seems to be concentrated at the center. Well, that’s what we measure. There’s a lot of material near the center. But there’s also some material out in these spiral ...
Document
... • The abundances depend on a variety of stellar parameters (effective temperature, gravity, etc) as well as oscillator strength f. In particular the the product of Af is obtained, the product of the abundance and the oscillator strength. • The uncertainties in the f value is what limits you in pract ...
... • The abundances depend on a variety of stellar parameters (effective temperature, gravity, etc) as well as oscillator strength f. In particular the the product of Af is obtained, the product of the abundance and the oscillator strength. • The uncertainties in the f value is what limits you in pract ...
Gaps
... Recio-Blanco et al., ApJL 572, 2002 • Fast HB rotation, although maybe not present in all clusters, is a fairly common feature. ...
... Recio-Blanco et al., ApJL 572, 2002 • Fast HB rotation, although maybe not present in all clusters, is a fairly common feature. ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.