A physical interpretation of the `red Sirius` anomaly
... interstellar extinction (Section 3.1). Both Rayleigh and aerosol components of atmospheric extinction scale in proportion to exp 2h=H, where h is the altitude of the observer and H is the appropriate scaleheight: typical values of H for Rayleigh and aerosol extinction are 8 and 1.5 km, respectively ...
... interstellar extinction (Section 3.1). Both Rayleigh and aerosol components of atmospheric extinction scale in proportion to exp 2h=H, where h is the altitude of the observer and H is the appropriate scaleheight: typical values of H for Rayleigh and aerosol extinction are 8 and 1.5 km, respectively ...
sections 23-25 powerpoint
... Elliptical galaxy (E). A spheroidal galaxy containing millions to billions of old low-mass stars and no gas or dust. Spiral Galaxy (S). A galaxy with a spheroidal bulge of several million old low-mass stars and a flattened pancake-like disk of billions of old low-mass and young high-mass stars, alon ...
... Elliptical galaxy (E). A spheroidal galaxy containing millions to billions of old low-mass stars and no gas or dust. Spiral Galaxy (S). A galaxy with a spheroidal bulge of several million old low-mass stars and a flattened pancake-like disk of billions of old low-mass and young high-mass stars, alon ...
A Zoo of Galaxies - Cambridge University Press
... 4. How Many Galaxies are There? In his 1927 defence of the classification scheme, Hubble claimed to have examined “upward of a thousand galaxies” in its construction. However for true physical understanding of a galaxy, more than just an image is required – we also need an estimate of its distance in ...
... 4. How Many Galaxies are There? In his 1927 defence of the classification scheme, Hubble claimed to have examined “upward of a thousand galaxies” in its construction. However for true physical understanding of a galaxy, more than just an image is required – we also need an estimate of its distance in ...
The Origin and Evolution of Dust in Galaxies
... Star formation rate (SFR) > Gas injection rate from SNe and AGB LMC star formation depends on the large reservoir of existing ISM gas The LMC is getting gas poorer. The SFR is likely to be declining with time. Chemical evolution of the LMC ISM is very slow process (~1 Gyrs) ...
... Star formation rate (SFR) > Gas injection rate from SNe and AGB LMC star formation depends on the large reservoir of existing ISM gas The LMC is getting gas poorer. The SFR is likely to be declining with time. Chemical evolution of the LMC ISM is very slow process (~1 Gyrs) ...
The Legacy of Galileo - Keck Institute for Space Studies
... should be bound to confess your opinion to be true.”7 This was the point, the philosopher and the theologian would have not agreed to change their views based on the experiment if the experimental evidence was against Aristotle’s teachings. The thinking of Galileo, like that of other great scientist ...
... should be bound to confess your opinion to be true.”7 This was the point, the philosopher and the theologian would have not agreed to change their views based on the experiment if the experimental evidence was against Aristotle’s teachings. The thinking of Galileo, like that of other great scientist ...
Search For Gas Giants Around Late-m Dwarfs - STARS
... 3.15 Close-up of Figure 4.15 showing wavelength calibration done in REDSPEC (blue), IRAF (red) These are then compared to a telluric model, HITRAN (green) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
... 3.15 Close-up of Figure 4.15 showing wavelength calibration done in REDSPEC (blue), IRAF (red) These are then compared to a telluric model, HITRAN (green) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
instructor notes: weeks 9/10
... is assumed to have been very hot, but a few hundred thousand years after the Big Bang the fireball had cooled considerably, although still at high temperatures. When the fireball had cooled to T ≈ 3000 K it became transparent to energy. The thermal energy of the hot universe then escaped into space ...
... is assumed to have been very hot, but a few hundred thousand years after the Big Bang the fireball had cooled considerably, although still at high temperatures. When the fireball had cooled to T ≈ 3000 K it became transparent to energy. The thermal energy of the hot universe then escaped into space ...
Chemical composition of B-type supergiants in the OB8, OB10
... and I filters, OB78-159 was observed to be part of a multiple system (see Fig. 1; from McCarthy et al. in preparation), which might explain the difference in radial velocity. An additional discrepancy is the large difference in the radial velocities of the OB8 supergiants. No radial velocities have ...
... and I filters, OB78-159 was observed to be part of a multiple system (see Fig. 1; from McCarthy et al. in preparation), which might explain the difference in radial velocity. An additional discrepancy is the large difference in the radial velocities of the OB8 supergiants. No radial velocities have ...
arXiv:astro-ph/0701557v1 19 Jan 2007
... literature. Spectral energy distributions (SEDs) and evolutionary synthesis models have been used to characterize the star formation at different scales from those of individual star clusters (tens of pc) to that of the entire star-forming ring (kpc scale). At the smallest scales two different popul ...
... literature. Spectral energy distributions (SEDs) and evolutionary synthesis models have been used to characterize the star formation at different scales from those of individual star clusters (tens of pc) to that of the entire star-forming ring (kpc scale). At the smallest scales two different popul ...
Super-Earth and Sub-Neptune Exoplanets: a First Look from the
... et al. 1989; Wolszczan & Frail 1992; Mayor & Queloz 1995). Results from the NASA Kepler satellite indicate that main-sequence stars on average host, at a minimum, about one planet per star (Fressin et al. 2013; Dressing & Charbonneau 2013). For the first time in human history, we have incontrovertib ...
... et al. 1989; Wolszczan & Frail 1992; Mayor & Queloz 1995). Results from the NASA Kepler satellite indicate that main-sequence stars on average host, at a minimum, about one planet per star (Fressin et al. 2013; Dressing & Charbonneau 2013). For the first time in human history, we have incontrovertib ...
The Most Luminous Protostars in Molecular Clouds: A Hint to
... mass to the mass of the entire cloud system including stars. If we assume that the LF given in equation (1) is scaled up by the external pressure, a very high SFE of 30–90% is expected for clouds located around the upper envelope in figure 1 where a large fraction of the cloud material should alread ...
... mass to the mass of the entire cloud system including stars. If we assume that the LF given in equation (1) is scaled up by the external pressure, a very high SFE of 30–90% is expected for clouds located around the upper envelope in figure 1 where a large fraction of the cloud material should alread ...
Gemini - www.BahaiStudies.net
... To look at Gemini is to look away from the Milky Way; as a result, there are comparatively few deep-sky objects of note. The Eskimo Nebula and Medusa Nebula, Messier object M35, and Geminga are those that attract the most attention. The Eskimo and Medusa nebulae are both planetary nebulae, the one a ...
... To look at Gemini is to look away from the Milky Way; as a result, there are comparatively few deep-sky objects of note. The Eskimo Nebula and Medusa Nebula, Messier object M35, and Geminga are those that attract the most attention. The Eskimo and Medusa nebulae are both planetary nebulae, the one a ...
PPT presentation
... Arnaboldi et al. (1998) have measured the rotation curve and velocity dispersions along two axes of the early type galaxy NGC 1316 (Fornax A) from RV measurements of 43 PNe. The total galactic mass inside 16 kpc radius was derived to be 2.9x1011 solar masses. ...
... Arnaboldi et al. (1998) have measured the rotation curve and velocity dispersions along two axes of the early type galaxy NGC 1316 (Fornax A) from RV measurements of 43 PNe. The total galactic mass inside 16 kpc radius was derived to be 2.9x1011 solar masses. ...
Radio pulsars
... Binary pulsars • Some pulsars are in orbit around another star. Orbital periods range from 1.6 hours to several years. • Only a few percent of normal pulsars, but more than half of all millisecond pulsars, are binary. • Pulsar companion stars range from very low-mass white dwarfs (~0.01 solar masse ...
... Binary pulsars • Some pulsars are in orbit around another star. Orbital periods range from 1.6 hours to several years. • Only a few percent of normal pulsars, but more than half of all millisecond pulsars, are binary. • Pulsar companion stars range from very low-mass white dwarfs (~0.01 solar masse ...
lecture course
... just formed. AGNs have non-thermal spectra and so emit quite a lot of energy outside visible wavebands. They are much brighter than stars at X-ray and radio wavelengths, for a given optical luminosity. AGNs vary considerably in their radio properties. Optically luminous QSOs can be either radio-loud ...
... just formed. AGNs have non-thermal spectra and so emit quite a lot of energy outside visible wavebands. They are much brighter than stars at X-ray and radio wavelengths, for a given optical luminosity. AGNs vary considerably in their radio properties. Optically luminous QSOs can be either radio-loud ...
the Local Group - Simon P Driver
... tides • the maths for distortions of extended galaxies made up of many stars are hard, but we can picture the potential wells – start with the 5 Lagrangian points, which show stable positions e.g. for satellites launched from the Earth ...
... tides • the maths for distortions of extended galaxies made up of many stars are hard, but we can picture the potential wells – start with the 5 Lagrangian points, which show stable positions e.g. for satellites launched from the Earth ...
Sky Watcher - Boise Astronomical Society
... in 1978, then Denebola is your birthday star this year. Denebola is the 3 rd brightest star in the Zodiac, so it’s very visible from town. Denebola is young in star years. At 400 million years old, it’s less than 1/10 th the sun’s age. It’s more massive than the sun and therefore hotter. Denebola ha ...
... in 1978, then Denebola is your birthday star this year. Denebola is the 3 rd brightest star in the Zodiac, so it’s very visible from town. Denebola is young in star years. At 400 million years old, it’s less than 1/10 th the sun’s age. It’s more massive than the sun and therefore hotter. Denebola ha ...
A Sixty-Year Timeline of the Air Force Maui Optical and
... (AMOS) has provided the U.S. Department of Defense (DoD) with space situational awareness capabilities from the island of Maui, Hawaii. AMOS is comprised of two separate facilities: the Maui Space Surveillance Complex (MSSC) and the Maui High Performance Computing Center (MHPCC). The MSSC is located ...
... (AMOS) has provided the U.S. Department of Defense (DoD) with space situational awareness capabilities from the island of Maui, Hawaii. AMOS is comprised of two separate facilities: the Maui Space Surveillance Complex (MSSC) and the Maui High Performance Computing Center (MHPCC). The MSSC is located ...
Mapping of the extinction in giant molecular clouds using optical star
... Indeed, for highly extinguished regions, the low number density of stars requires a larger area to pick up enough stars and estimate the extinction. The result is therefore an average value over a large area in which the extinction is, in fact, greater. In the Taurus cloud, I found that this turn of ...
... Indeed, for highly extinguished regions, the low number density of stars requires a larger area to pick up enough stars and estimate the extinction. The result is therefore an average value over a large area in which the extinction is, in fact, greater. In the Taurus cloud, I found that this turn of ...
OBSERVATIONS OF PHYSICAL PROCESSES IN
... cluster galaxies (BCGs) of those clusters. It has been known for a while that the state of the hot intracluster medium (ICM) gas in the core of a galaxy cluster, quantified as the central entropy of the gas, can be found in two particular states. Galaxy clusters with central entropies greater than 3 ...
... cluster galaxies (BCGs) of those clusters. It has been known for a while that the state of the hot intracluster medium (ICM) gas in the core of a galaxy cluster, quantified as the central entropy of the gas, can be found in two particular states. Galaxy clusters with central entropies greater than 3 ...
bservatory ontrol and stronomical nalysis
... 3 OCAAS Desktop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 4 Real-Time Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 5 Scheduled Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
... 3 OCAAS Desktop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 4 Real-Time Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 5 Scheduled Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Evolution of the Milky Way with radial motions of stars and gas
... matter and rotational velocity, which also depend on the distribution of the dark matter halo). Some of those properties play an important role in determining the extent of radial displacement of stars; this is the role of the rotation curve for blurring, for example (Sect. 2.2.1). Unfortunately, de ...
... matter and rotational velocity, which also depend on the distribution of the dark matter halo). Some of those properties play an important role in determining the extent of radial displacement of stars; this is the role of the rotation curve for blurring, for example (Sect. 2.2.1). Unfortunately, de ...
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.