Scientific Justification
... association (1–3 Myr) and 10 members of the dense, more evolved OB association Upper Scorpius (10 Myr); see Observations Summary Table for details. Because both Taurus and Upper Scorpius are large clusters and our targets are spread over > 3 degrees within each region, we are requesting all observat ...
... association (1–3 Myr) and 10 members of the dense, more evolved OB association Upper Scorpius (10 Myr); see Observations Summary Table for details. Because both Taurus and Upper Scorpius are large clusters and our targets are spread over > 3 degrees within each region, we are requesting all observat ...
My Constellation
... Royal Stars of the ancients, along with Aldebaran, Regulus, and Fomalhaut. It glitters with an unusual metallic red while the entire region is bathed in a pale red nebula, lit from the same star. This red supergiant has a visual binary that just might be visible, depending on local conditions and th ...
... Royal Stars of the ancients, along with Aldebaran, Regulus, and Fomalhaut. It glitters with an unusual metallic red while the entire region is bathed in a pale red nebula, lit from the same star. This red supergiant has a visual binary that just might be visible, depending on local conditions and th ...
Rotational Doppler beaming in eclipsing binaries
... In general the detectability is a combination of source flux, eclipse duration, instrument stability and intrinsic amplitude. Source flux can be optimized using a bigger telescope, eclipse duration is unfortunately a given for an individual source, instrument stability is in the design of the instru ...
... In general the detectability is a combination of source flux, eclipse duration, instrument stability and intrinsic amplitude. Source flux can be optimized using a bigger telescope, eclipse duration is unfortunately a given for an individual source, instrument stability is in the design of the instru ...
Document
... 1999: using ASCA, X-1 in M82 was found to vary by up to a factor of four, confirming that this bright source was indeed a single object. *Over half of ULXs are known to be variable, ruling out the multiple source or SNR hypothesis. ...
... 1999: using ASCA, X-1 in M82 was found to vary by up to a factor of four, confirming that this bright source was indeed a single object. *Over half of ULXs are known to be variable, ruling out the multiple source or SNR hypothesis. ...
The Death of Stars
... d. a white dwarf in a close binary system. e. a solar like star that has exhausted its hydrogen and helium. 10. The Algol paradox is explained by considering a. the degenerate nature of the hydrogen on the surface of the white dwarf. b. that iron is the most tightly bound of all atomic nuclei. c. th ...
... d. a white dwarf in a close binary system. e. a solar like star that has exhausted its hydrogen and helium. 10. The Algol paradox is explained by considering a. the degenerate nature of the hydrogen on the surface of the white dwarf. b. that iron is the most tightly bound of all atomic nuclei. c. th ...
Eppur Si Muove – Stellar Parallax?
... 61 Cygni has a huge proper motion – 5 arcseconds per year – making it a likely candidate for being nearby ...
... 61 Cygni has a huge proper motion – 5 arcseconds per year – making it a likely candidate for being nearby ...
CHP 13
... d. a white dwarf in a close binary system. e. a solar like star that has exhausted its hydrogen and helium. The Algol paradox is explained by considering a. the degenerate nature of the hydrogen on the surface of the white dwarf. b. that iron is the most tightly bound of all atomic nuclei. c. the ra ...
... d. a white dwarf in a close binary system. e. a solar like star that has exhausted its hydrogen and helium. The Algol paradox is explained by considering a. the degenerate nature of the hydrogen on the surface of the white dwarf. b. that iron is the most tightly bound of all atomic nuclei. c. the ra ...
Microsoft Word 97
... of dust surrounding newly formed stars is easily observed from the ground and from infrared spacecraft. c) They found infrared radiation from so many stars in our galaxy that we think about one star forms in our galaxy each year. d) Since the interstellar gas is “invisible” in the visible part of th ...
... of dust surrounding newly formed stars is easily observed from the ground and from infrared spacecraft. c) They found infrared radiation from so many stars in our galaxy that we think about one star forms in our galaxy each year. d) Since the interstellar gas is “invisible” in the visible part of th ...
IAU 29th General Assembly
... •FM 2 – Astronomical Heritage: Progressing the UNESCO–IAU Initiative •FM 3 – Scholarly Publication in Astronomy: Evolution or Revolution? •FM 4 – Planetary Nebulae as Probes of Galactic Structure and Evolution •FM 5 – The Legacy of Planck •FM 6 – X-ray Surveys of the Hot and Energetic Cosmos •FM 7 – ...
... •FM 2 – Astronomical Heritage: Progressing the UNESCO–IAU Initiative •FM 3 – Scholarly Publication in Astronomy: Evolution or Revolution? •FM 4 – Planetary Nebulae as Probes of Galactic Structure and Evolution •FM 5 – The Legacy of Planck •FM 6 – X-ray Surveys of the Hot and Energetic Cosmos •FM 7 – ...
two dozen compact sources and a massive disk
... • Sub-arcsecond SMA + VLA observations reveal a prolific protocluster with 25 members: NGC 6334 I(N) • We perform the first dynamical mass measurement using hot core line emission (410 ± 260 M), compatible with dust estimates • We analyze its structure using tools developed for infrared clusters (Q ...
... • Sub-arcsecond SMA + VLA observations reveal a prolific protocluster with 25 members: NGC 6334 I(N) • We perform the first dynamical mass measurement using hot core line emission (410 ± 260 M), compatible with dust estimates • We analyze its structure using tools developed for infrared clusters (Q ...
36x48 vertical poster template
... mode switch-over as well as during the August test period so a direct comparison could be made. 32 HRC exposures of Mars, each 0.3 seconds long, were taken in a single orbit using the F435W filter. The single filter was used to increase the stability. The images were cross correlated and the shifts ...
... mode switch-over as well as during the August test period so a direct comparison could be made. 32 HRC exposures of Mars, each 0.3 seconds long, were taken in a single orbit using the F435W filter. The single filter was used to increase the stability. The images were cross correlated and the shifts ...
The Magellan 20 Telescope Science Goals
... Detailed measurement of the ground layer wave-front distortions should be possible nearly anywhere in the sky using natural guide stars in the field. Rayleigh laser beacons may be used if higher photon rates are required. The potential scientific gains are large. For point sources in the background- ...
... Detailed measurement of the ground layer wave-front distortions should be possible nearly anywhere in the sky using natural guide stars in the field. Rayleigh laser beacons may be used if higher photon rates are required. The potential scientific gains are large. For point sources in the background- ...
The Helium Flash • When the temperature of a stellar core reaches T
... is necessary for mass loss, then an additional factor should be included reflecting the inverse correlation between metallicity and grain density. Mass loss rates for stars of ∼ 1M⊙ can reach ∼ 10−8 M⊙ yr−1 at the tip of the giant branch. The total amount of mass lost during the giant branch phase c ...
... is necessary for mass loss, then an additional factor should be included reflecting the inverse correlation between metallicity and grain density. Mass loss rates for stars of ∼ 1M⊙ can reach ∼ 10−8 M⊙ yr−1 at the tip of the giant branch. The total amount of mass lost during the giant branch phase c ...
Leverhulme lectures on stellar magnetism. 1. Overview
... Weak magnetic fields are present in ISM – few μG to mG Fields probably partly retained by collapsing gas cloud as star forms, due to high conductivity of gas => field lines are (partly) frozen in and compressed, and field is amplified Such retained fields may be origin of “static” fields of MS stars ...
... Weak magnetic fields are present in ISM – few μG to mG Fields probably partly retained by collapsing gas cloud as star forms, due to high conductivity of gas => field lines are (partly) frozen in and compressed, and field is amplified Such retained fields may be origin of “static” fields of MS stars ...
Stargazer - Everett Astronomical Society
... event from local schools, scout groups, senior homes, or similar groups. Usually this would be in the form of a star party at their gathering, or perhaps a short slide show or night sky talk. Providing education and support to the community about interest astronomy is one of the main missions of the ...
... event from local schools, scout groups, senior homes, or similar groups. Usually this would be in the form of a star party at their gathering, or perhaps a short slide show or night sky talk. Providing education and support to the community about interest astronomy is one of the main missions of the ...
The Milky Way: Spiral galaxies:
... •! Spirals show HI disks (amount of HI depends on Hubble type) •! HI gas is optically thin: the 21 cm line suffers almost no absorption. Note that spin flips are classically “forbidden”: on average, a single hydrogen atom will take 107 years to decay! The probability of an absorption is even rarer. ...
... •! Spirals show HI disks (amount of HI depends on Hubble type) •! HI gas is optically thin: the 21 cm line suffers almost no absorption. Note that spin flips are classically “forbidden”: on average, a single hydrogen atom will take 107 years to decay! The probability of an absorption is even rarer. ...
Rotation, activity, and stellar obliquities in a large uniform sample of
... sample of v ¼ 6þ5 6 , similar to that seen in the solar system. Key words. Stars: activity – Stars: solar-type – Stars: rotation ...
... sample of v ¼ 6þ5 6 , similar to that seen in the solar system. Key words. Stars: activity – Stars: solar-type – Stars: rotation ...
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.