astro2_lec1 - Astronomy & Astrophysics Group
... o Leavitt studied Cepheids in the Large Magellanic Cloud, a satellite galaxy of the Milky Way and known even then to be very distant. o Differences in apparent brightness of LMC Cepheids must be due to differences in intrinsic ...
... o Leavitt studied Cepheids in the Large Magellanic Cloud, a satellite galaxy of the Milky Way and known even then to be very distant. o Differences in apparent brightness of LMC Cepheids must be due to differences in intrinsic ...
20 – N10/4/PHYSI/SP3/ENG/TZ0/XX Option E
... (iii) State why the method of parallax can only be used for stars at a distance of less than a few hundred parsecs from Earth. ...
... (iii) State why the method of parallax can only be used for stars at a distance of less than a few hundred parsecs from Earth. ...
SEEDS
... frequency of brown dwarf companions to Sun-like hosts relative to the frequency of both less massive planetary companions and more massive stellar companions. However, recent direct imaging surveys of main sequence stars have produced somewhat inconsistent results; one supports the desert (McCarthy ...
... frequency of brown dwarf companions to Sun-like hosts relative to the frequency of both less massive planetary companions and more massive stellar companions. However, recent direct imaging surveys of main sequence stars have produced somewhat inconsistent results; one supports the desert (McCarthy ...
Astronomy 100 Name(s):
... How do astronomers know anything about parts of the solar system and universe that we (humans or the probes we send) have never physically touched? The answer lies in the light that is emitted or reflected by an astronomical object. In this exercise, you will experimentally investigate objects that ...
... How do astronomers know anything about parts of the solar system and universe that we (humans or the probes we send) have never physically touched? The answer lies in the light that is emitted or reflected by an astronomical object. In this exercise, you will experimentally investigate objects that ...
Oldest SN
... the apparent brightness of these supernovae at their peak exists. We assume that these are canonical supernovae with an absolute magnitude of -19.6 and then derive their apparent magnitude from their distance. Both these objects would have been visible from the site. The age of these SNRs is determi ...
... the apparent brightness of these supernovae at their peak exists. We assume that these are canonical supernovae with an absolute magnitude of -19.6 and then derive their apparent magnitude from their distance. Both these objects would have been visible from the site. The age of these SNRs is determi ...
• This chapter concentrates on five goals:
... At the bend of the handle of the Big Dipper lies a pair of stars, Mizar and Alcor. Through a telescope you can discover that Mizar has a fainter companion and so is a member of a visual binary system. Adaptive optics observations have discovered a faint close companion of Alcor, not pictured in thi ...
... At the bend of the handle of the Big Dipper lies a pair of stars, Mizar and Alcor. Through a telescope you can discover that Mizar has a fainter companion and so is a member of a visual binary system. Adaptive optics observations have discovered a faint close companion of Alcor, not pictured in thi ...
Death of the Stars
... Our Sun will also go thru the Red Giant stage. During this stage the Sun will swell to be as large as Venus’ orbit, and maybe even engulf the Earth (in a few billion years). However, as we have seen, the Sun is an ordinary star, there are more massive stars than the Sun, and when they go through the ...
... Our Sun will also go thru the Red Giant stage. During this stage the Sun will swell to be as large as Venus’ orbit, and maybe even engulf the Earth (in a few billion years). However, as we have seen, the Sun is an ordinary star, there are more massive stars than the Sun, and when they go through the ...
ASTR-100 - Jiri Brezina Teaching
... in 365.2564 days in the same (counter-clockwise, eastward) direction. See: http://www.nationmaster.com/encyclopedia/Sidereal-year During the Moon’s sidereal period, the sun moves eastward about 1°/day (360°/365.2564 days) = about 27° (26.928474° more exactly) eastward; this is why the moon needs sli ...
... in 365.2564 days in the same (counter-clockwise, eastward) direction. See: http://www.nationmaster.com/encyclopedia/Sidereal-year During the Moon’s sidereal period, the sun moves eastward about 1°/day (360°/365.2564 days) = about 27° (26.928474° more exactly) eastward; this is why the moon needs sli ...
Polarimetry with the Southern African Large Telescope
... The Robert Stobie Spectrograph (RSS) (built at Wisconsin, Rutgers & SAAO) An efficient and versatile Imaging Spectrograph • capable of UV-Vis spectroscopy from 310 – 900nm using VPHGs (red extension to 1.7µm, using a dichroic, is under construction) • high time resolution ablility (~0.1 s) • specto ...
... The Robert Stobie Spectrograph (RSS) (built at Wisconsin, Rutgers & SAAO) An efficient and versatile Imaging Spectrograph • capable of UV-Vis spectroscopy from 310 – 900nm using VPHGs (red extension to 1.7µm, using a dichroic, is under construction) • high time resolution ablility (~0.1 s) • specto ...
Transcript - Chandra X
... white dwarfs is orbiting each other at only 50,000 miles (1/5th the distance to the moon) every 5 minutes at an orbital speed of one million miles per hour. The orbit period is decreasing by 1.2 milliseconds/year which means they are moving closer to each other by 2 feet every day. This system shoul ...
... white dwarfs is orbiting each other at only 50,000 miles (1/5th the distance to the moon) every 5 minutes at an orbital speed of one million miles per hour. The orbit period is decreasing by 1.2 milliseconds/year which means they are moving closer to each other by 2 feet every day. This system shoul ...
The Search for Another Earth
... Are there planets similar to the Earth? For centuries, these questions baffled curious minds. Either a positive or negative answer, if found one day, would carry a deep philosophical significance for our very existence in the universe. Although the search for extra-terrestrial intelligence was initiate ...
... Are there planets similar to the Earth? For centuries, these questions baffled curious minds. Either a positive or negative answer, if found one day, would carry a deep philosophical significance for our very existence in the universe. Although the search for extra-terrestrial intelligence was initiate ...
Stellar Evolution Review
... a) they don’t emit any radiation b) they are surrounded by clouds of gas and dust c) they only emit infrared radiation d) they are all moving away from Earth so fast that their visible light is Doppler shifted into the infrared ...
... a) they don’t emit any radiation b) they are surrounded by clouds of gas and dust c) they only emit infrared radiation d) they are all moving away from Earth so fast that their visible light is Doppler shifted into the infrared ...
Astrobiology: The Search for Extraterrestrial Life
... Unfortunately, this method has two substantial disadvantages. Planetary transits are only observable if the exoplanet has an orbit that is perfectly aligned from the astronomers vantage point. The probability of a planetary orbital plane being perfectly on the line-of-sight to a star is given as the ...
... Unfortunately, this method has two substantial disadvantages. Planetary transits are only observable if the exoplanet has an orbit that is perfectly aligned from the astronomers vantage point. The probability of a planetary orbital plane being perfectly on the line-of-sight to a star is given as the ...
Planet Observing 24 Oct 2015
... planets and of the eight planets in the solar system only five are visible to the naked eye. This week and next four of these five planets are gathered in the predawn skies. Two of these, Venus and Jupiter, are brighter than any star in the sky and the weekend of the 24th-25th they will appear just ...
... planets and of the eight planets in the solar system only five are visible to the naked eye. This week and next four of these five planets are gathered in the predawn skies. Two of these, Venus and Jupiter, are brighter than any star in the sky and the weekend of the 24th-25th they will appear just ...
A Closer Earth and the Faint Young Sun Paradox: Modification of the
... Laser Ranging (LLR) technique [46], are smaller than eq. (12) by two orders of magnitude. It could be ...
... Laser Ranging (LLR) technique [46], are smaller than eq. (12) by two orders of magnitude. It could be ...
chromospheric telescope of baikal astrophysical observatory. new light
... components, positive and negative, making them from one material and with radii of curvature that are equal in size but different in sign. The latter is very favorable for the mutual control of radii of curvature and lens surface shape when manufactured. The lens reconstructs and enlarges a solar im ...
... components, positive and negative, making them from one material and with radii of curvature that are equal in size but different in sign. The latter is very favorable for the mutual control of radii of curvature and lens surface shape when manufactured. The lens reconstructs and enlarges a solar im ...
PLANETARY SCIENCE
... the surface of the land is and the solar angle. We can see this if we think of Earth’s surface as made of lots of little flat areas. In this illustration, we see four rays of light coming to Earth. Ray 1 happens to strike Earth exactly perpendicular to the surface. The solar angle is 90o. Light ray ...
... the surface of the land is and the solar angle. We can see this if we think of Earth’s surface as made of lots of little flat areas. In this illustration, we see four rays of light coming to Earth. Ray 1 happens to strike Earth exactly perpendicular to the surface. The solar angle is 90o. Light ray ...
Hidden57_rf
... creating ever more powerful instruments to satisfy our voracious appetite for knowledge. Nonetheless, until the mid-20th century our knowledge of the Universe was limited almost entirely to the narrow band of light that could penetrate the Earth’s atmosphere and was visible to our eyes or to sensiti ...
... creating ever more powerful instruments to satisfy our voracious appetite for knowledge. Nonetheless, until the mid-20th century our knowledge of the Universe was limited almost entirely to the narrow band of light that could penetrate the Earth’s atmosphere and was visible to our eyes or to sensiti ...
Chapter 13
... • Stars smaller than 0.1 M rarely seen since their mass is too small for their cores to initiate fusion reactions • Objects with masses between planets and are called brown dwarfs, “failed stars” extremely dim and difficult to observe • Upper mass limit of stars (about 30 M) due to extreme tempera ...
... • Stars smaller than 0.1 M rarely seen since their mass is too small for their cores to initiate fusion reactions • Objects with masses between planets and are called brown dwarfs, “failed stars” extremely dim and difficult to observe • Upper mass limit of stars (about 30 M) due to extreme tempera ...
Question (15a0002) Solution
... The work needed to launch the Hubble Space Telescope into orbit. The Hubble Space Telescope (HST or the Hubble") has a mass of about 11,100 kg and is in a nearly circular orbit of altitude 560 km. (a) Use the momentum principle to calculate the speed of the HST. (b) What is the period of its orbit? ...
... The work needed to launch the Hubble Space Telescope into orbit. The Hubble Space Telescope (HST or the Hubble") has a mass of about 11,100 kg and is in a nearly circular orbit of altitude 560 km. (a) Use the momentum principle to calculate the speed of the HST. (b) What is the period of its orbit? ...
Pathways to Astronomy/Space
... in Astronomy, the content (presented in lesson format), the big ideas and the culminating activity. Each pathway has an assigned theme: a means of engaging the students with a mental hook, followed by a series of six modules, by which all of the expectations may be covered. To complete the pathway, ...
... in Astronomy, the content (presented in lesson format), the big ideas and the culminating activity. Each pathway has an assigned theme: a means of engaging the students with a mental hook, followed by a series of six modules, by which all of the expectations may be covered. To complete the pathway, ...
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.