Compartive Planetology I: Our Solar. System
... across—about i/. of the width of a human hair and far too small to be seen without a microscope. The planets themselves are very small compared to the distances between them. Indeed, while an airliner traveling at 1000 km/h (620 mi/h) can fly around Earth in less than two days, at this speed it woul ...
... across—about i/. of the width of a human hair and far too small to be seen without a microscope. The planets themselves are very small compared to the distances between them. Indeed, while an airliner traveling at 1000 km/h (620 mi/h) can fly around Earth in less than two days, at this speed it woul ...
3D Tour of the Universe Template
... found astronomical showpiece if the sky is dark, where suggestions of its spiral arms may be visible. As is also common with these types of galaxy interactions, the central region of M51 is home to a compact, energetic birth site of massive and luminous stars, whose genesis was triggered by interste ...
... found astronomical showpiece if the sky is dark, where suggestions of its spiral arms may be visible. As is also common with these types of galaxy interactions, the central region of M51 is home to a compact, energetic birth site of massive and luminous stars, whose genesis was triggered by interste ...
Circumstellar Disks: IRAS to ALMA (by way of HST) Dr. Karl Stapelfeldt
... Debris Disks and Exoplanets ...
... Debris Disks and Exoplanets ...
Observational studies of stellar rotation
... period Prot . This technique has the advantage over spectroscopy of yielding a measurement of the stellar rotation rate that is free of geometric effects and is straighforwardly converted to angular velocity, Ω = 2π/Prot . However, this is at the expense of requiring intense photometric monitoring o ...
... period Prot . This technique has the advantage over spectroscopy of yielding a measurement of the stellar rotation rate that is free of geometric effects and is straighforwardly converted to angular velocity, Ω = 2π/Prot . However, this is at the expense of requiring intense photometric monitoring o ...
Mergers of massive main sequence binaries
... R stands for rapid), while in case AS systems it can take considerably more time before a contact binary is formed, i.e. on the nuclear timescale of the primary (hence the name AS, where S stands for slow). It will turn out that this difference leads to different compositions of the merger product i ...
... R stands for rapid), while in case AS systems it can take considerably more time before a contact binary is formed, i.e. on the nuclear timescale of the primary (hence the name AS, where S stands for slow). It will turn out that this difference leads to different compositions of the merger product i ...
abstracts book - Instituto de Astrofísica e Ciências do Espaço
... has secured major advances in the understanding of the physics of the stellar interiors and has allowed us to build and prepare the tools to look at other stars. Several ground facilities and space missions have completed the picture by adding the necessary data to study stars across the HR diagram ...
... has secured major advances in the understanding of the physics of the stellar interiors and has allowed us to build and prepare the tools to look at other stars. Several ground facilities and space missions have completed the picture by adding the necessary data to study stars across the HR diagram ...
Chemical composition of 90 F and G disk dwarfs
... Particularly important is the detailed abundance analysis of 189 F and G dwarfs with −1.1 < [Fe/H] < 0.25 by Edvardsson et al. (1993a, hereafter EAGLNT). The main results from this work may be summarized as follows: (1) There are no tight relations between age, metallicity and kinematics of disk sta ...
... Particularly important is the detailed abundance analysis of 189 F and G dwarfs with −1.1 < [Fe/H] < 0.25 by Edvardsson et al. (1993a, hereafter EAGLNT). The main results from this work may be summarized as follows: (1) There are no tight relations between age, metallicity and kinematics of disk sta ...
Maximizing the ExoEarth Candidate Yield from a Future Direct
... for the desired exposure time. We ignore mission scheduling constraints and realtime costbased decision making that are included in more complex “mission execution simulators” (e.g., Savransky et al. 2010). However, the yield maximization methods described below run rapidly (∼ few seconds on a singl ...
... for the desired exposure time. We ignore mission scheduling constraints and realtime costbased decision making that are included in more complex “mission execution simulators” (e.g., Savransky et al. 2010). However, the yield maximization methods described below run rapidly (∼ few seconds on a singl ...
IRAS - the infrared - Imperial College London Astrophysics
... the IRAS all-sky survey of infrared point-sources: white: star-forming regions, blue: red giant stars, green: galaxies. IRAS detected 60,000 dusty, star-forming glaxies over the whole sky. Thessaloniki, Oct 3rd 2009 ...
... the IRAS all-sky survey of infrared point-sources: white: star-forming regions, blue: red giant stars, green: galaxies. IRAS detected 60,000 dusty, star-forming glaxies over the whole sky. Thessaloniki, Oct 3rd 2009 ...
Michell, Laplace and the Origin of the Black Hole Concept
... Herschel’s two 1782 papers, and especially the catalogue of double stars, provided Michell with the ‘means’ on which to base his second astronomical paper, which bears the exceedingly long and laborious title, “On the Means of Discovering the Distance, Magnitude, &c. of the Fixed Stars, in Consequen ...
... Herschel’s two 1782 papers, and especially the catalogue of double stars, provided Michell with the ‘means’ on which to base his second astronomical paper, which bears the exceedingly long and laborious title, “On the Means of Discovering the Distance, Magnitude, &c. of the Fixed Stars, in Consequen ...
He went on to become one of the outstanding astronomers in history.
... He earned a law degree and worked as a lawyer for one year. ...
... He earned a law degree and worked as a lawyer for one year. ...
Seeing the infinitely small - Musées de la Ville de Genève
... has it that the telescope has its origins in Holland where children had apparently discovered that they could see into the distance while looking through two lenses placed one in front of the other. At the beginning of the 17th century Lippershey, a Dutch craftsman, sold an instrument “for seeing th ...
... has it that the telescope has its origins in Holland where children had apparently discovered that they could see into the distance while looking through two lenses placed one in front of the other. At the beginning of the 17th century Lippershey, a Dutch craftsman, sold an instrument “for seeing th ...
My Constellation
... the same field. Both galaxies are elongated north-south; M65 has a tighter spiral and is perhaps the more noticeable. Õ NGC 3628, a galaxy seen edge-on. Actually, this is larger than either Messier object, but much dimmer because it is seen edge-on. Õ M95 (NGC 3351) and M96 (NGC 3368) form another n ...
... the same field. Both galaxies are elongated north-south; M65 has a tighter spiral and is perhaps the more noticeable. Õ NGC 3628, a galaxy seen edge-on. Actually, this is larger than either Messier object, but much dimmer because it is seen edge-on. Õ M95 (NGC 3351) and M96 (NGC 3368) form another n ...
Leica Nova MS50 - White Paper
... For longer distances, the energy and therewith the signal to noise ratio (SNR) of one single returned pulse gets very small. This makes it difficult to extract the stop pulse. Therefore the WFD accumulates signals to the same target multiple times. As more signals are sent out and received, the bett ...
... For longer distances, the energy and therewith the signal to noise ratio (SNR) of one single returned pulse gets very small. This makes it difficult to extract the stop pulse. Therefore the WFD accumulates signals to the same target multiple times. As more signals are sent out and received, the bett ...
Cepheid
... It could be that the Cepheids in the LMC are all exactly the same in apparent brightness, regardless of the periods. This would tell us that all Cepheids are equally bright intrinsically. (That would be very helpful!) On the other hand, the Cepheids might have a variety of brightnesses that are comp ...
... It could be that the Cepheids in the LMC are all exactly the same in apparent brightness, regardless of the periods. This would tell us that all Cepheids are equally bright intrinsically. (That would be very helpful!) On the other hand, the Cepheids might have a variety of brightnesses that are comp ...
- ANU Repository
... of 183 M dwarfs with effective temperatures (Teff ), radii (R∗ ) and luminosities (L∗ ) determined by parallaxes and either interferometric or spectroscopic methods of angular diameters. Flux-calibrated visible-wavelength and near-infrared spectra were obtained for all these stars from which photome ...
... of 183 M dwarfs with effective temperatures (Teff ), radii (R∗ ) and luminosities (L∗ ) determined by parallaxes and either interferometric or spectroscopic methods of angular diameters. Flux-calibrated visible-wavelength and near-infrared spectra were obtained for all these stars from which photome ...
Behaviour of elements from lithium to europium in stars with and
... 2015b), the main properties of planets and their hosts (e.g. mass) (Kang, Lee & Kim 2011; Dorn et al. 2015; Sousa et al. 2015), their position in the Galaxy (Haywood 2008, 2009; Adibekyan et al. 2014), and Galactic evolution (e.g. Adibekyan et al. 2015b). Studies of the chemical composition of the S ...
... 2015b), the main properties of planets and their hosts (e.g. mass) (Kang, Lee & Kim 2011; Dorn et al. 2015; Sousa et al. 2015), their position in the Galaxy (Haywood 2008, 2009; Adibekyan et al. 2014), and Galactic evolution (e.g. Adibekyan et al. 2015b). Studies of the chemical composition of the S ...
The Hubble Space Telescope Optical Systems Failure Report
... The HST program is the result of a cooperative effort between NASA and the European Space Agency, private contractors, and astronomers worldwide. The management responsibilities included design, development, launch, and daily operations of the telescope. The NASA Centers and prime contractors involv ...
... The HST program is the result of a cooperative effort between NASA and the European Space Agency, private contractors, and astronomers worldwide. The management responsibilities included design, development, launch, and daily operations of the telescope. The NASA Centers and prime contractors involv ...
Supernovae and Gamma-Ray Bursts (draft)
... by this interaction with the circumstellar material. Supernovae (e.g., § 8.3) that show evidence for such interactions are sometimes referred to as Type IIa supernovae (SNe IIa), though how this fits into the overall supernova scheme and, in particular, its relation to SNe IIb devies any obvious log ...
... by this interaction with the circumstellar material. Supernovae (e.g., § 8.3) that show evidence for such interactions are sometimes referred to as Type IIa supernovae (SNe IIa), though how this fits into the overall supernova scheme and, in particular, its relation to SNe IIb devies any obvious log ...
The Hubble Space Telescope Optical Systems Failure Report
... The HST program is the result of a cooperative effort between NASA and the European Space Agency, private contractors, and astronomers worldwide. The management responsibilities included design, development, launch, and daily operations of the telescope. The NASA Centers and prime contractors involv ...
... The HST program is the result of a cooperative effort between NASA and the European Space Agency, private contractors, and astronomers worldwide. The management responsibilities included design, development, launch, and daily operations of the telescope. The NASA Centers and prime contractors involv ...
Manufacture of 8.4 m off-axis segments
... Most large mirrors have a loose tolerance on focus, equivalent to a tolerance on radius of curvature of 1 mm or more. The GMT segments have a much tighter tolerance on focus because of the need for all seven mirrors to have the same image magnification. The requirement is strictly that the segments ...
... Most large mirrors have a loose tolerance on focus, equivalent to a tolerance on radius of curvature of 1 mm or more. The GMT segments have a much tighter tolerance on focus because of the need for all seven mirrors to have the same image magnification. The requirement is strictly that the segments ...
International Ultraviolet Explorer
The International Ultraviolet Explorer (IUE) was an astronomical observatory satellite primarily designed to take ultraviolet spectra. The satellite was a collaborative project between NASA, the UK Science Research Council and the European Space Agency (ESA). The mission was first proposed in early 1964, by a group of scientists in the United Kingdom, and was launched on January 26, 1978 aboard a NASA Delta rocket. The mission lifetime was initially set for 3 years, but in the end it lasted almost 18 years, with the satellite being shut down in 1996. The switch-off occurred for financial reasons, while the telescope was still functioning at near original efficiency.It was the first space observatory to be operated in real time by astronomers who visited the groundstations in the United States and Europe. Astronomers made over 104,000 observations using the IUE, of objects ranging from solar system bodies to distant quasars. Among the significant scientific results from IUE data were the first large scale studies of stellar winds, accurate measurements of the way interstellar dust absorbs light, and measurements of the supernova SN1987A which showed that it defied stellar evolution theories as they then stood. When the mission ended, it was considered the most successful astronomical satellite ever.