JHK standard stars for large telescopes: the UKIRT Fundamental
... from Landolt’s (1983) equatorial UBVRI standards and the compilation of potential Hubble Space Telescope (HST ) reference sources by Turnshek et al. (1990), supplemented by additional main-sequence objects with solar-like colours from the old open cluster M67 (Eggen & Sandage 1964) and subgiants fro ...
... from Landolt’s (1983) equatorial UBVRI standards and the compilation of potential Hubble Space Telescope (HST ) reference sources by Turnshek et al. (1990), supplemented by additional main-sequence objects with solar-like colours from the old open cluster M67 (Eggen & Sandage 1964) and subgiants fro ...
the UKIRT Fundamental and Extended lists
... from Landolt’s (1983) equatorial UBVRI standards and the compilation of potential Hubble Space Telescope (HST ) reference sources by Turnshek et al. (1990), supplemented by additional main-sequence objects with solar-like colours from the old open cluster M67 (Eggen & Sandage 1964) and subgiants fro ...
... from Landolt’s (1983) equatorial UBVRI standards and the compilation of potential Hubble Space Telescope (HST ) reference sources by Turnshek et al. (1990), supplemented by additional main-sequence objects with solar-like colours from the old open cluster M67 (Eggen & Sandage 1964) and subgiants fro ...
The 2006 RBSE Journal - National Optical Astronomy Observatory
... Significant variation was detected; and there were a couple of microvariability events in the graph. The time scale if the change is such that something exceptionally small must have interfered with the flux to cause it. With changes happening over the course of just a few minutes could be caused by ...
... Significant variation was detected; and there were a couple of microvariability events in the graph. The time scale if the change is such that something exceptionally small must have interfered with the flux to cause it. With changes happening over the course of just a few minutes could be caused by ...
Lecture18
... Extrasolar planets Many hundreds now known! Very difficult to detect (star much much brighter)... indirect “wobble” methods used based on velocity (Doppler shift) or position (Astrometry) of the star, “transits” (planet blocks starlight). Which detection method can be used depends on orientation of ...
... Extrasolar planets Many hundreds now known! Very difficult to detect (star much much brighter)... indirect “wobble” methods used based on velocity (Doppler shift) or position (Astrometry) of the star, “transits” (planet blocks starlight). Which detection method can be used depends on orientation of ...
The Pleiades in the Salle des Taureaux", Grotte de Lascaux
... number eighteen there can be seen a large dark dot with a half bow drawn across it, the eye with the brow (fig. 1). Around it are five spots of medium size and seven or more, smaller ones: a picture which reminds one very much of the distribution of the Hyades around the Aldebarán [87 • Tau (Aldebar ...
... number eighteen there can be seen a large dark dot with a half bow drawn across it, the eye with the brow (fig. 1). Around it are five spots of medium size and seven or more, smaller ones: a picture which reminds one very much of the distribution of the Hyades around the Aldebarán [87 • Tau (Aldebar ...
Stellar Properties
... • a star could be very bright because is was very close to us; not because it was truly bright • two stars in the same constellation might not be close to each other; one could be much farther away ...
... • a star could be very bright because is was very close to us; not because it was truly bright • two stars in the same constellation might not be close to each other; one could be much farther away ...
Galaxy Spiral Arms
... while revolving with the galaxy as a whole. We all believe that the Pleiades Cluster stays together due to mutual gravitation between the component stars and gases. We can make some decent estimates of characteristics of this very large, tapering and somewhat cone-shaped, open cluster that we all ca ...
... while revolving with the galaxy as a whole. We all believe that the Pleiades Cluster stays together due to mutual gravitation between the component stars and gases. We can make some decent estimates of characteristics of this very large, tapering and somewhat cone-shaped, open cluster that we all ca ...
Multi-Wavelength Observations of Known, and Searches
... days to length of light curve (2 years at that time). Easily detected LS I +61 303 and LS 5039, but not Cyg X-3. (To detect Cyg X-3 must only use data from active states.) And a candidate for a new binary... ...
... days to length of light curve (2 years at that time). Easily detected LS I +61 303 and LS 5039, but not Cyg X-3. (To detect Cyg X-3 must only use data from active states.) And a candidate for a new binary... ...
May 2017 Astronomy Calendar by Dave Mitsky
... The usually minor June Boötid Class III meteor shower may peak on the morning of June 24th. June Boötids are the slowest of all meteors, travelling at 18 kilometers (11 miles) per second. Browse http://www.popastro.com/meteor/activity/activity.php?id_pag=485 for additional information. Information o ...
... The usually minor June Boötid Class III meteor shower may peak on the morning of June 24th. June Boötids are the slowest of all meteors, travelling at 18 kilometers (11 miles) per second. Browse http://www.popastro.com/meteor/activity/activity.php?id_pag=485 for additional information. Information o ...
The Formation and Evolution of Massive Black Holes - Ira-Inaf
... alternative view, the galaxy-regulated hypothesis, the galaxy sets the MBH mass by regulating the amount of gas that trickles to the MBH. One of the most interesting results that has recently emerged on black hole and galaxy growth is the strong link between the global black hole growth rate and the ...
... alternative view, the galaxy-regulated hypothesis, the galaxy sets the MBH mass by regulating the amount of gas that trickles to the MBH. One of the most interesting results that has recently emerged on black hole and galaxy growth is the strong link between the global black hole growth rate and the ...
Star formation in a galactic outflow
... to the morphological evolution of galaxies12, to the evolution in size and velocity dispersion of the spheroidal component of galaxies11,13, and would contribute to the population of highvelocity stars, which could even escape the galaxy13. Such star formation could provide in-situ chemical enrichme ...
... to the morphological evolution of galaxies12, to the evolution in size and velocity dispersion of the spheroidal component of galaxies11,13, and would contribute to the population of highvelocity stars, which could even escape the galaxy13. Such star formation could provide in-situ chemical enrichme ...
Entropy
... direction of time, etc. (see, e.g. [1-5]). Starting from the studies by R. Clausius and his concept of heat death of the Universe and until now, the papers related to entropy have always been in the centre of attention among astrophysicists and cosmologists. Currently, this quantity and its derivati ...
... direction of time, etc. (see, e.g. [1-5]). Starting from the studies by R. Clausius and his concept of heat death of the Universe and until now, the papers related to entropy have always been in the centre of attention among astrophysicists and cosmologists. Currently, this quantity and its derivati ...
Curtis/Shapley Debate – 1920 - Tufts Institute of Cosmology
... the Universe was thought to lie about 9000 km down - the distance they computed to the center of the earth. The earth was considered the center of the universe because the leading theory about this at the time came from the Greek astronomer Claudius Ptolemy in about 140 A.D. In this theory, the eart ...
... the Universe was thought to lie about 9000 km down - the distance they computed to the center of the earth. The earth was considered the center of the universe because the leading theory about this at the time came from the Greek astronomer Claudius Ptolemy in about 140 A.D. In this theory, the eart ...
KINEMATIC DISCOVERY OF A STELLAR STREAM LOCATED IN
... (0 < log g < 4.0) from the Sloan Digital Sky Survey Data Release 8 (SDSS DR8) spectroscopic data in the south Galactic hemisphere. The Cetus stream was clearly present in velocity versus Galactic latitude plots of these stars, along with an additional feature consisting of a few stars clumped at vgs ...
... (0 < log g < 4.0) from the Sloan Digital Sky Survey Data Release 8 (SDSS DR8) spectroscopic data in the south Galactic hemisphere. The Cetus stream was clearly present in velocity versus Galactic latitude plots of these stars, along with an additional feature consisting of a few stars clumped at vgs ...
Entropy Production of Main-Sequence Stars
... to discuss of black holes, questions connected with the accelerated expansion of the Universe, to build and generalize gravitation theories, etc. (see, e.g., [6–10]). The majority of the papers, being strictly theoretical, place principal emphasis on functional relations between variables establishe ...
... to discuss of black holes, questions connected with the accelerated expansion of the Universe, to build and generalize gravitation theories, etc. (see, e.g., [6–10]). The majority of the papers, being strictly theoretical, place principal emphasis on functional relations between variables establishe ...
Infrared Properties of Star-Forming Dwarf Galaxies. I. Dwarf Irregular
... A sample of 34 dwarf irregular galaxies (dIs) in the Local Volume, most nearer than 5 Mpc, has been imaged in the near-infrared (NIR) in J and Ks at the Canada-France-Hawaii Telescope (CFHT) in Hawaii and the Observatorio Astronómico Nacional in the Sierra San Pedro Mártir, in Mexico. Absolute mag ...
... A sample of 34 dwarf irregular galaxies (dIs) in the Local Volume, most nearer than 5 Mpc, has been imaged in the near-infrared (NIR) in J and Ks at the Canada-France-Hawaii Telescope (CFHT) in Hawaii and the Observatorio Astronómico Nacional in the Sierra San Pedro Mártir, in Mexico. Absolute mag ...
X-ray emission from young pulsar, PWN and SNRs
... • Most of the filaments contain point-like sources at their heads. • All the filaments cometaryare morphology. The X-ray show filaments most • The spectra are non-thermal, with photon indices probably close to Sgr A* and ...
... • Most of the filaments contain point-like sources at their heads. • All the filaments cometaryare morphology. The X-ray show filaments most • The spectra are non-thermal, with photon indices probably close to Sgr A* and ...
When we look at a neighboring galaxy (such as M31, the
... physically larger, but less massive, than our Milky Way Galaxy. The Andromeda is the largest member of the Local Group, a cluster of about 30 galaxies that are gravitationally attracted to one another. At a distance of 2.5 million light-years, it is the most distant object easily seen with the unaid ...
... physically larger, but less massive, than our Milky Way Galaxy. The Andromeda is the largest member of the Local Group, a cluster of about 30 galaxies that are gravitationally attracted to one another. At a distance of 2.5 million light-years, it is the most distant object easily seen with the unaid ...
A very massive runaway star from Cygnus OB2⋆
... Although the identication of BD+43 3654 as a likely runaway star dates back to van Buren & McCray (1988), no spectral classication is available in that work. Subsequent papers by van Buren et al. (1995) and Noriega-Crespo et al. (1997) refer to the star as a unspecied B-type but do not report ded ...
... Although the identication of BD+43 3654 as a likely runaway star dates back to van Buren & McCray (1988), no spectral classication is available in that work. Subsequent papers by van Buren et al. (1995) and Noriega-Crespo et al. (1997) refer to the star as a unspecied B-type but do not report ded ...
16. Magnitude Systems
... • The official (online) SDSS magnitudes are stored in a unit called luptitudes or asinh magnitudes • This unit was designed to improve magnitudes for very faint objects (for very low signal-to-noise measurements) • In this system, m = -(2.5/ln10)[asinh((f/f0)/2b) +ln(b)] instead of m = -2.5log10(f/f ...
... • The official (online) SDSS magnitudes are stored in a unit called luptitudes or asinh magnitudes • This unit was designed to improve magnitudes for very faint objects (for very low signal-to-noise measurements) • In this system, m = -(2.5/ln10)[asinh((f/f0)/2b) +ln(b)] instead of m = -2.5log10(f/f ...
Astronomy 114 - Department of Astronomy
... Magnitude scale Greek astronomer Hipparchus divided stars into six classes or magnitudes (2nd century BC) 1st magnitude is brightest, 6th magnitude is faintest Sensitivity of human eye is logarithmic Magnitude difference of 1 corresponds log(1000) 3 to −2.5 log(F1 /F2 ) ...
... Magnitude scale Greek astronomer Hipparchus divided stars into six classes or magnitudes (2nd century BC) 1st magnitude is brightest, 6th magnitude is faintest Sensitivity of human eye is logarithmic Magnitude difference of 1 corresponds log(1000) 3 to −2.5 log(F1 /F2 ) ...
A Collection of Curricula for the STARLAB Polynesian Voyaging
... C.E. (Common Era or A.D.) in Egypt, a writer of scientific information named Ptolemy collected the stories and made a catalog of star groups. Of the constellations that he listed, 48 are still recognized by modern astronomers and called by the same names. In more modern times, 40 other constellation ...
... C.E. (Common Era or A.D.) in Egypt, a writer of scientific information named Ptolemy collected the stories and made a catalog of star groups. Of the constellations that he listed, 48 are still recognized by modern astronomers and called by the same names. In more modern times, 40 other constellation ...
SXDS Highlights : Subaru / FOCAS Spectroscopy
... Natural guide star AO system on Subaru telescope with IRCS. 154 hours of observation in total. 13 FoVs with 36 LBGs , 1 RadioG., and 7 DRGs are observed. Typical on-source effective integration is 5 hours. Typical PSF size at the target position is FWHM=0.2” (~1.5kpc@z=3) ...
... Natural guide star AO system on Subaru telescope with IRCS. 154 hours of observation in total. 13 FoVs with 36 LBGs , 1 RadioG., and 7 DRGs are observed. Typical on-source effective integration is 5 hours. Typical PSF size at the target position is FWHM=0.2” (~1.5kpc@z=3) ...
11-Massive Stars
... is called the emission measure, EM, n2e × L, where L is the length through the region of electron density ne , since this is proportional to the observed flux. From this, they find that, for a wide range of UC and compact H II regions, there is a relationship of the form ne = 7.8 × 102 Lo−1.2 where ...
... is called the emission measure, EM, n2e × L, where L is the length through the region of electron density ne , since this is proportional to the observed flux. From this, they find that, for a wide range of UC and compact H II regions, there is a relationship of the form ne = 7.8 × 102 Lo−1.2 where ...
Abstract book
... Title: Density or mass, which control the early stages of the star formation process? Abstract. How do stellar clusters form is a one of the key questions for understanding the physical mechanisms that drive the transformation of cold molecular gas into stars in different environments. In particular ...
... Title: Density or mass, which control the early stages of the star formation process? Abstract. How do stellar clusters form is a one of the key questions for understanding the physical mechanisms that drive the transformation of cold molecular gas into stars in different environments. In particular ...
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.