Astronomy 518 Astrometry Lecture
... The declination (δ) of X is the angular distance from the celestial equator to X, measured from -90° at the SCP to +90° at the NCP. Any point on celestial equator has declination 0°. The Hour Angle or HA (H) of object X is the angular distance between the meridian of X and celestial meridian. It is ...
... The declination (δ) of X is the angular distance from the celestial equator to X, measured from -90° at the SCP to +90° at the NCP. Any point on celestial equator has declination 0°. The Hour Angle or HA (H) of object X is the angular distance between the meridian of X and celestial meridian. It is ...
Stars and Galaxies - Red Hook Central Schools
... takes our Solar System about 200 million years to revolve once around our galaxy ...
... takes our Solar System about 200 million years to revolve once around our galaxy ...
ALMA Science Results
... active nuclei? Observe many spectral lines and compare them to probe excitation. – Species often optically thick. Multiband scans provide many lines. 175GHz scan of NGC4418. Similar beam from 85-360GHz, The galaxy has high silicate absorption at ten microns. Narrow molecular lines, radio quiet. » Li ...
... active nuclei? Observe many spectral lines and compare them to probe excitation. – Species often optically thick. Multiband scans provide many lines. 175GHz scan of NGC4418. Similar beam from 85-360GHz, The galaxy has high silicate absorption at ten microns. Narrow molecular lines, radio quiet. » Li ...
Schmidt-Cassegrain Optical Tube Assembly
... Occasionally, dust and/or moisture may build up on the corrector plate of your telescope. Special care should be taken when cleaning any instrument so as not to damage the optics. If dust has built up on the corrector plate, remove it with a brush (made of camel’s hair) or a can of pressurized air. ...
... Occasionally, dust and/or moisture may build up on the corrector plate of your telescope. Special care should be taken when cleaning any instrument so as not to damage the optics. If dust has built up on the corrector plate, remove it with a brush (made of camel’s hair) or a can of pressurized air. ...
Note on Brooks` new comet c 1911
... stars, and was thus enabled to give the approximate altitudes and azimuths of the meteor when first seen and also at the end of its course. She heard no noise, but was first made aware of the meteor by an intense light falling on the ground in front of her, and from the movement of this light she in ...
... stars, and was thus enabled to give the approximate altitudes and azimuths of the meteor when first seen and also at the end of its course. She heard no noise, but was first made aware of the meteor by an intense light falling on the ground in front of her, and from the movement of this light she in ...
Follow Proxima Centauri - Department of Physics and Astronomy
... celestial coordinate reference is its proper motion. You know these effects must be really small because when you watch stars night after night they always seem to have the same position relative to one another. Their changing position in the sky is a consequence of the Earth's rotation. If we watch ...
... celestial coordinate reference is its proper motion. You know these effects must be really small because when you watch stars night after night they always seem to have the same position relative to one another. Their changing position in the sky is a consequence of the Earth's rotation. If we watch ...
Properties of Wolf-Rayet Stars - Paul Crowther, University of Sheffield
... intrinsically weak emission lines. For example, HD 93131 (WN6ha) has a He ii λ4686 emission equivalent width which is an order of magnitude smaller than that observed in other WN6 stars; the ‘ha’ nomenclature indicates that hydrogen is seen both in absorption and emission. From a standard spectrosco ...
... intrinsically weak emission lines. For example, HD 93131 (WN6ha) has a He ii λ4686 emission equivalent width which is an order of magnitude smaller than that observed in other WN6 stars; the ‘ha’ nomenclature indicates that hydrogen is seen both in absorption and emission. From a standard spectrosco ...
Heavy Element Abundances in Late-B and Early
... that are found to show anomalous spectral line strengths and shapes. Our study does not attempt to isolate the groups from each other by identifying discriminants, but rather to understand observed differences in existing groups and to try to find common physical processes that may clarify the obser ...
... that are found to show anomalous spectral line strengths and shapes. Our study does not attempt to isolate the groups from each other by identifying discriminants, but rather to understand observed differences in existing groups and to try to find common physical processes that may clarify the obser ...
Cygnus X-2, super-Eddington mass transfer, and pulsar binaries
... We consider the unusual evolutionary state of the secondary star in Cygnus X-2. Spectroscopic data give a low mass (M2 ≃ 0.5 − 0.7M⊙ ) and yet a large radius (R2 ≃ 7R⊙ ) and high luminosity (L2 ≃ 150L⊙ ). We show that this star closely resembles a remnant of early massive Case B evolution, during wh ...
... We consider the unusual evolutionary state of the secondary star in Cygnus X-2. Spectroscopic data give a low mass (M2 ≃ 0.5 − 0.7M⊙ ) and yet a large radius (R2 ≃ 7R⊙ ) and high luminosity (L2 ≃ 150L⊙ ). We show that this star closely resembles a remnant of early massive Case B evolution, during wh ...
an introduction to astrophysics
... Negative powers are frequently used with symbols in the units of physical quantities. For instance, speed is measured in metres per second, written in symbols as m/s or m s−1 . By use of negative indices, Equation 1.5 can easily be applied to situations in which quantities are divided by one another ...
... Negative powers are frequently used with symbols in the units of physical quantities. For instance, speed is measured in metres per second, written in symbols as m/s or m s−1 . By use of negative indices, Equation 1.5 can easily be applied to situations in which quantities are divided by one another ...
PDF
... probably be improved using current planet microlensing experiments, but then thought of something new: The Kepler spacecraft in its search for extra-‐solar planets might be far better than any of the ...
... probably be improved using current planet microlensing experiments, but then thought of something new: The Kepler spacecraft in its search for extra-‐solar planets might be far better than any of the ...
presentation (PPT format)
... distance (vary depending on the technique between 40100km/s/Mpc) • Because the value of H0 is somewhat uncertain usually • We express the distance in terms of redshift z (that can be measured very accurately) • The greater the redshift of a distant galaxy the greater its ...
... distance (vary depending on the technique between 40100km/s/Mpc) • Because the value of H0 is somewhat uncertain usually • We express the distance in terms of redshift z (that can be measured very accurately) • The greater the redshift of a distant galaxy the greater its ...
Imaging the Universe Robert Mutel A Laboratory Manual for Introductory Astronomy
... is expected. This worksheet is designed to help you either catch up, or remember the math that you were supposed to have learned in high school. Do not be intimidated by this worksheet! Most of what follows is the sort of math that you use in your everyday life, when calculating tips, or balancing y ...
... is expected. This worksheet is designed to help you either catch up, or remember the math that you were supposed to have learned in high school. Do not be intimidated by this worksheet! Most of what follows is the sort of math that you use in your everyday life, when calculating tips, or balancing y ...
Fluorine abundances in dwarf stars of the solar neighbourhood⋆
... Cloud and in the globular cluster ω Cen. They found that the abundance ratio of F/O declines as the oxygen abundance decreases. They therefore suggested that the observed low values of F/O exclude AGB synthesis as the dominant source of fluorine in their targeted stellar populations. In particular, ...
... Cloud and in the globular cluster ω Cen. They found that the abundance ratio of F/O declines as the oxygen abundance decreases. They therefore suggested that the observed low values of F/O exclude AGB synthesis as the dominant source of fluorine in their targeted stellar populations. In particular, ...
November Celestial Calendar by Dave Mitsky All times are UT
... central Aquarius, about three degrees west of the fifth-magnitude star Sigma Aquarii and two degrees east of the fifth-magnitude star 38 Aquarii this month. Finder charts for Uranus and Neptune can be found on page 81 of the August issue of Astronomy, on page 50 of the October issue of Sky & Telesco ...
... central Aquarius, about three degrees west of the fifth-magnitude star Sigma Aquarii and two degrees east of the fifth-magnitude star 38 Aquarii this month. Finder charts for Uranus and Neptune can be found on page 81 of the August issue of Astronomy, on page 50 of the October issue of Sky & Telesco ...
Ursa Minor
Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.