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Galaxies - cloudfront.net
... Our solar system is located in the __________ Galaxy. A set of stars that are grouped closely together is called a star __________. Hundreds or thousands of stars that are grouped closely together make up a star __________. A system of two stars orbiting each other is called a(n) __________. A spira ...
... Our solar system is located in the __________ Galaxy. A set of stars that are grouped closely together is called a star __________. Hundreds or thousands of stars that are grouped closely together make up a star __________. A system of two stars orbiting each other is called a(n) __________. A spira ...
Chap1-Introduction - Groupe d`astrophysique de UdeM
... The mass distribution of Super-Earths and Neptune-mass planets (SEN) is strongly increasing between 30 and 15 ME. • Low-mass planets appear to be very common. ...
... The mass distribution of Super-Earths and Neptune-mass planets (SEN) is strongly increasing between 30 and 15 ME. • Low-mass planets appear to be very common. ...
Hubble`s Use of Cepheids (PDF version)
... Wilson. (Shapley later moved to Harvard.) Shapley had dismissed this as impossible – he ‘knew’ that the spiral nebulae were small, nearby objects. It was galling for him to see Hubble credited with this profound discovery. ...
... Wilson. (Shapley later moved to Harvard.) Shapley had dismissed this as impossible – he ‘knew’ that the spiral nebulae were small, nearby objects. It was galling for him to see Hubble credited with this profound discovery. ...
Journey through the cosmos
... This to and fro motion is only an illusion. When Mars is observed from Earth, it may first appear to be in front of Earth. But, because Earth is travelling much faster in its orbit, Earth can overtake Mars which falls behind Earth. This gives the appearance that Mars has moved backwards. Astronomers ...
... This to and fro motion is only an illusion. When Mars is observed from Earth, it may first appear to be in front of Earth. But, because Earth is travelling much faster in its orbit, Earth can overtake Mars which falls behind Earth. This gives the appearance that Mars has moved backwards. Astronomers ...
How I Learned to Stop Worrying and Love Eclipsing Binaries
... with random pairings drawn from IMF – components formed relatively independently Solar-type binaries: same trend but still have correlated component masses at wide separations due to long-lived primordial disks ...
... with random pairings drawn from IMF – components formed relatively independently Solar-type binaries: same trend but still have correlated component masses at wide separations due to long-lived primordial disks ...
Our Local Group of Galaxies
... How complete is the list of Milky Way dSph companions? • Grey area shows region of the sky covered in Data Release 6 of the SDSS. Previously known MW satellites are marked in blue, new discoveries in red. Solid black line and middle grey stripe are at declination zero - inside is the region to be s ...
... How complete is the list of Milky Way dSph companions? • Grey area shows region of the sky covered in Data Release 6 of the SDSS. Previously known MW satellites are marked in blue, new discoveries in red. Solid black line and middle grey stripe are at declination zero - inside is the region to be s ...
Astronomy Assignment #1
... Since the “addresses” of the stars in RA and dec are tied to the Earth (i.e. the celestial poles are the extension of the Earth’s rotation pole and the celestial equator lies directly above the Earth’s geographic equator), as the Earth reorients its rotation axis due to precession all the stars addr ...
... Since the “addresses” of the stars in RA and dec are tied to the Earth (i.e. the celestial poles are the extension of the Earth’s rotation pole and the celestial equator lies directly above the Earth’s geographic equator), as the Earth reorients its rotation axis due to precession all the stars addr ...
Spiral Galaxies - Astronomy Centre
... • The debate itself was inconclusive, but it did focus attention on the nebulae • The debate was resolved in 1924 by Edwin Hubble who used the Mt Wilson 100-inch telescope to observe Cepheid variable stars in the Andromeda Nebula • Using the period-luminosity relation for these stars, and comparing ...
... • The debate itself was inconclusive, but it did focus attention on the nebulae • The debate was resolved in 1924 by Edwin Hubble who used the Mt Wilson 100-inch telescope to observe Cepheid variable stars in the Andromeda Nebula • Using the period-luminosity relation for these stars, and comparing ...
binary stars instructor notes
... consisting of two stars, both classified as spectral type G5 V with magnitudes V = 6.26 and V = 6.36, having an orbital period of P = 25.0 years and a semi-major axis a = 0".67. Assume bolometric corrections of BC = –0.05 for G5 V stars and that the system is close enough to be unreddened by ...
... consisting of two stars, both classified as spectral type G5 V with magnitudes V = 6.26 and V = 6.36, having an orbital period of P = 25.0 years and a semi-major axis a = 0".67. Assume bolometric corrections of BC = –0.05 for G5 V stars and that the system is close enough to be unreddened by ...
THE DENSEST GALAXY
... radius (see below) is re = 24.2 ± 0.5 pc. The inferred total luminosities are: Lg = (3.26 ± 0.06) × 107 L ; Lz = (7.88 ± 0.14) × 107 L ; and LV = (4.12 ± 0.08) × 107 L . With MV = −14.2, M60-UCD1 is the most luminous UCD known (see §4.1 for further discussion). We fit the optical imaging with one ...
... radius (see below) is re = 24.2 ± 0.5 pc. The inferred total luminosities are: Lg = (3.26 ± 0.06) × 107 L ; Lz = (7.88 ± 0.14) × 107 L ; and LV = (4.12 ± 0.08) × 107 L . With MV = −14.2, M60-UCD1 is the most luminous UCD known (see §4.1 for further discussion). We fit the optical imaging with one ...
Image filtering
... Sky noise-limited: all pixels have equal variance. The flux measurement of the fitted profile is equivalent to a profile-weighted aperture photometry Star photon noise-limited: variance is proportional to the pixel values above the background level. The flux measurement of the fitted profile is ...
... Sky noise-limited: all pixels have equal variance. The flux measurement of the fitted profile is equivalent to a profile-weighted aperture photometry Star photon noise-limited: variance is proportional to the pixel values above the background level. The flux measurement of the fitted profile is ...
Calibration of Non-Spatially-Filtered Data in Optical
... By comparing the measured size of the disk to predictions, and by re-analysing Hubble Space Telescope spectra, we can show that Mira B is an ordinary star 0.5-0.7 times as massive as the sun. ...
... By comparing the measured size of the disk to predictions, and by re-analysing Hubble Space Telescope spectra, we can show that Mira B is an ordinary star 0.5-0.7 times as massive as the sun. ...
with answers
... ● the Sun increases in luminosity as it ages and “moves up” the H-R diagram. This is an increase of approximately 1% every 110 million years (Schroder & Connon Smith 2008), which would lead to a higher rate of hydrogen loss. ○ “The helium "ashes" left behind are denser than hydrogen, so the hydrogen ...
... ● the Sun increases in luminosity as it ages and “moves up” the H-R diagram. This is an increase of approximately 1% every 110 million years (Schroder & Connon Smith 2008), which would lead to a higher rate of hydrogen loss. ○ “The helium "ashes" left behind are denser than hydrogen, so the hydrogen ...
Toward a revival of Stellar Intensity Interferometry
... telescopes must be aligned in time for the correlation to be measured. Analog or even digital programmable delays can be used for this. As in Michelson interferometers, because of the geometrical projection effect, the effective baseline between two telescopes changes during the observation of a sta ...
... telescopes must be aligned in time for the correlation to be measured. Analog or even digital programmable delays can be used for this. As in Michelson interferometers, because of the geometrical projection effect, the effective baseline between two telescopes changes during the observation of a sta ...
Neutron star masses: dwarfs, giants and neighbors
... We assume that the rapid rotation of the core of a collapsing star can be explained by tidal synchronization in a very close binary. The calculated rate of formation of rapidly rotating neutron stars is qualitatively consistent with estimates of the formation rate of magnetars. However, our analysis ...
... We assume that the rapid rotation of the core of a collapsing star can be explained by tidal synchronization in a very close binary. The calculated rate of formation of rapidly rotating neutron stars is qualitatively consistent with estimates of the formation rate of magnetars. However, our analysis ...
sections 19-22 instructor notes
... radial velocity, since simple mathematical analysis indicates that clouds at two different distances symmetric about Rmin must have identical radial motions. Such ambiguities are resolved by mapping the clouds in Galactic latitude b, since nearby clouds should subtend a larger angular extent than di ...
... radial velocity, since simple mathematical analysis indicates that clouds at two different distances symmetric about Rmin must have identical radial motions. Such ambiguities are resolved by mapping the clouds in Galactic latitude b, since nearby clouds should subtend a larger angular extent than di ...
sections 19-22 instructor notes
... radial velocity, since simple mathematical analysis indicates that clouds at two different distances symmetric about Rmin must have identical radial motions. Such ambiguities are resolved by mapping the clouds in Galactic latitude b, since nearby clouds should subtend a larger angular extent than di ...
... radial velocity, since simple mathematical analysis indicates that clouds at two different distances symmetric about Rmin must have identical radial motions. Such ambiguities are resolved by mapping the clouds in Galactic latitude b, since nearby clouds should subtend a larger angular extent than di ...
- Cosmotography
... 10 Gyr model with Z ∼ 0.002 would also be consistent with the data, while perhaps providing a better match to the observed CMD slope. We conclude that, if the bulk of the RGB stars are old (> 10 Gyr), the metallicity range is roughly Z = 0.001–0.004, while for younger ages the metallicity range shif ...
... 10 Gyr model with Z ∼ 0.002 would also be consistent with the data, while perhaps providing a better match to the observed CMD slope. We conclude that, if the bulk of the RGB stars are old (> 10 Gyr), the metallicity range is roughly Z = 0.001–0.004, while for younger ages the metallicity range shif ...
Camelopardalis-Better-Know-A-Constellation
... possesses about 100 emission regions as well as 27 variable stars. Larger instruments will reveal many of these regions that seem to take on likeliness to M33. Three supernovae have been spotted in this galaxy, one in 1954 (SN 1954J) with the others, a half a century later in 2002 (SN 2002kg) and in ...
... possesses about 100 emission regions as well as 27 variable stars. Larger instruments will reveal many of these regions that seem to take on likeliness to M33. Three supernovae have been spotted in this galaxy, one in 1954 (SN 1954J) with the others, a half a century later in 2002 (SN 2002kg) and in ...
Hipparcos
![](https://commons.wikimedia.org/wiki/Special:FilePath/Hipparcos-testing-estec.jpg?width=300)
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.