13.5 The HR Diagram By the early 1900s, astronomers had learned
... Giants, white dwarfs, and mainsequence stars differ in more than just diameter. They also differ dramatically in their overall density. Recall that density is a body's mass divided by its volume. For a given mass, a larger body will therefore have a lower density, and so a giant star is much less d ...
... Giants, white dwarfs, and mainsequence stars differ in more than just diameter. They also differ dramatically in their overall density. Recall that density is a body's mass divided by its volume. For a given mass, a larger body will therefore have a lower density, and so a giant star is much less d ...
My Favorite Universe
... his series of lectures discusses 12 topics based on 12 hand-picked essays out of 100 or so written for Natural History magazine since 1995. Although they do not follow a particular curriculum, they nonetheless represent the professor’s favorite cosmic subjects. And, not surprisingly, they represent ...
... his series of lectures discusses 12 topics based on 12 hand-picked essays out of 100 or so written for Natural History magazine since 1995. Although they do not follow a particular curriculum, they nonetheless represent the professor’s favorite cosmic subjects. And, not surprisingly, they represent ...
PDF only - at www.arxiv.org.
... 3. The Model The main aim of this paper is a physical model for the flux variation of the dip at day 792. The model is based on the idea, that a stream of matter leaves the star into space similar as observed in solar flares. The difference is, the stream of matter is quite high and lifts the matter ...
... 3. The Model The main aim of this paper is a physical model for the flux variation of the dip at day 792. The model is based on the idea, that a stream of matter leaves the star into space similar as observed in solar flares. The difference is, the stream of matter is quite high and lifts the matter ...
Observations of binary systems with pulsating components
... We can derive masses of binary system’s components in following cases: • Visual binary with absolute orbit and parallax. • Visual binary with relative orbit + SB2: • we have 7 elements of relative orbit (we know the orbital inclination) • from spectroscopic solution we have M1, M2, a1, a2 • since a= ...
... We can derive masses of binary system’s components in following cases: • Visual binary with absolute orbit and parallax. • Visual binary with relative orbit + SB2: • we have 7 elements of relative orbit (we know the orbital inclination) • from spectroscopic solution we have M1, M2, a1, a2 • since a= ...
public_lector_10
... Now we think it comes and goes, as in the movie - needs gas to maintain the spiral structure and star formation. Without replenishment of the gas, the star formation and spiral structure should go out in a few Gyr. Some gas comes from dying stars, but not enough. New gas may come from the infall of ...
... Now we think it comes and goes, as in the movie - needs gas to maintain the spiral structure and star formation. Without replenishment of the gas, the star formation and spiral structure should go out in a few Gyr. Some gas comes from dying stars, but not enough. New gas may come from the infall of ...
The Kuiper Belt Explored by Serendipitous Stellar Occultations
... The angular sizes of the stars depend on their spectral and luminosity class and on their distance (see section 2.5). Figure 1 shows that, for a large proportion of stars, there would be full extinction for KBOs under 1 km in radius if the occultation were purely geometrical in nature. In reality, d ...
... The angular sizes of the stars depend on their spectral and luminosity class and on their distance (see section 2.5). Figure 1 shows that, for a large proportion of stars, there would be full extinction for KBOs under 1 km in radius if the occultation were purely geometrical in nature. In reality, d ...
learning goals - Pearson Education
... Astronomy also played a practical role in ancient societies by enabling them to keep track of time and seasons, a crucial skill for people who depended on agriculture for survival. This ability may seem quaint today, when digital watches tell us the precise time and date, but it required considerabl ...
... Astronomy also played a practical role in ancient societies by enabling them to keep track of time and seasons, a crucial skill for people who depended on agriculture for survival. This ability may seem quaint today, when digital watches tell us the precise time and date, but it required considerabl ...
the solar neighborhood. xi. the trigonometric parallax of scr
... Luckily there is a wealth of astrometric data available for this object, partly because it lies in the overlap region between the standard Schmidt photographic survey fields and partly because nonsurvey programs have fortuitously observed the field containing the target frequently and over a long ti ...
... Luckily there is a wealth of astrometric data available for this object, partly because it lies in the overlap region between the standard Schmidt photographic survey fields and partly because nonsurvey programs have fortuitously observed the field containing the target frequently and over a long ti ...
Telluric Line Removal in Astrophysical Spectroscopy
... program IRAF, widely used for data reduction in astrophysics, contains a task called ‘telluric’ which uses Beer’s law to approximate extinction due to telluric lines. This task uses hot A-type stars as templates, and then shifts and scales the spectrum (IRAF Newsletter, 1998). Although this is not t ...
... program IRAF, widely used for data reduction in astrophysics, contains a task called ‘telluric’ which uses Beer’s law to approximate extinction due to telluric lines. This task uses hot A-type stars as templates, and then shifts and scales the spectrum (IRAF Newsletter, 1998). Although this is not t ...
Science with IMACS on Magellan
... The combination of large field and large aperture is achieved with some difficulty. The f/4.3 camera of IMACS produces an unvignetted 15-arcmin square field, comparable to DEIMOS on Keck, VIRMOS on VLT, and the planned Binospec on MMT, and an order-of-magnitude larger than LRIS or GMOS. The 27-arcmi ...
... The combination of large field and large aperture is achieved with some difficulty. The f/4.3 camera of IMACS produces an unvignetted 15-arcmin square field, comparable to DEIMOS on Keck, VIRMOS on VLT, and the planned Binospec on MMT, and an order-of-magnitude larger than LRIS or GMOS. The 27-arcmi ...
Month - University of Saskatchewan
... compared to any other site in Canada. Each evening we set up in the Meadows Campground, a large open area well away from any lights. While there, if you get tired of looking through your own telescope, you can wander around to look at and through other people’s telescopes, discuss eyepieces and filt ...
... compared to any other site in Canada. Each evening we set up in the Meadows Campground, a large open area well away from any lights. While there, if you get tired of looking through your own telescope, you can wander around to look at and through other people’s telescopes, discuss eyepieces and filt ...
OUR COSMIC NEIGHBORS Story of the Stars
... through the ages from the ancient Egyptians, Babylonians, Greeks, Romans and others. These early peoples endeavored to relate the curious groupings of stars to things that were familiar to them such as the lion, bear, eagle, warrior, etc. And thus were born romantic mythological accounts of truths a ...
... through the ages from the ancient Egyptians, Babylonians, Greeks, Romans and others. These early peoples endeavored to relate the curious groupings of stars to things that were familiar to them such as the lion, bear, eagle, warrior, etc. And thus were born romantic mythological accounts of truths a ...
Living with a Red Dwarf - Center for Space and Habitability (CSH)
... the atmosphere, and heat it to the point where the atmosphere can escape to space. • i.e. it’s the rocket fuel that brings molecules up to escape velocity and can launch atmosphere out of the gravity well. • Shorter wave ultraviolet drives photochemistry, and can break up heavy molecules into lighte ...
... the atmosphere, and heat it to the point where the atmosphere can escape to space. • i.e. it’s the rocket fuel that brings molecules up to escape velocity and can launch atmosphere out of the gravity well. • Shorter wave ultraviolet drives photochemistry, and can break up heavy molecules into lighte ...
Document
... Using IRAM and SCUBA: ~30% of radio-quiet quasars at z>4 detected at 1mm (observed frame) at 1mJy level submm radiation in radio-quiet quasars come from thermal dust with mass ~ 108 Msun • If dust heating came from starburst star formation rate of ...
... Using IRAM and SCUBA: ~30% of radio-quiet quasars at z>4 detected at 1mm (observed frame) at 1mJy level submm radiation in radio-quiet quasars come from thermal dust with mass ~ 108 Msun • If dust heating came from starburst star formation rate of ...
Research proposal uploaded for ESO fellowship
... How is the star formation history of galaxies affected by supernovae feedback? Is this feedback powerful enough as to drive the global star formation rate decline of the universe? Supernova feedback represents a long standing problem in galaxy formation model. Currently, toy models are used to treat ...
... How is the star formation history of galaxies affected by supernovae feedback? Is this feedback powerful enough as to drive the global star formation rate decline of the universe? Supernova feedback represents a long standing problem in galaxy formation model. Currently, toy models are used to treat ...
- Notesvillage
... nor terminates at the satellite itself. The satellite is an active transmission relay, similar in function to relay towers used in terrestrial microwave communications. The commercial satellite communications industry has its beginnings in the mid1960s, and in less than 50 years has progressed from ...
... nor terminates at the satellite itself. The satellite is an active transmission relay, similar in function to relay towers used in terrestrial microwave communications. The commercial satellite communications industry has its beginnings in the mid1960s, and in less than 50 years has progressed from ...
Star formation in a galactic outflow
... strong nebular emission lines. However, we have recovered the kinematics of the young stellar populations through our spectral fitting of the optical spectrum (Fig.4a and Methods), which is dominated by the Balmer lines (tracing young hot O-B type stars, but also contaminated by older Atype stars) a ...
... strong nebular emission lines. However, we have recovered the kinematics of the young stellar populations through our spectral fitting of the optical spectrum (Fig.4a and Methods), which is dominated by the Balmer lines (tracing young hot O-B type stars, but also contaminated by older Atype stars) a ...
Dishing Up the Data: The Role of Australian Space Tracking and
... Goldstone, California. In order to maintain continuous communications with lunar and planetary spacecraft, a minimum of three tracking stations, located around the globe at approximately 120° apart, is required to ensure that a spacecraft remains under constant observation despite the rotation of E ...
... Goldstone, California. In order to maintain continuous communications with lunar and planetary spacecraft, a minimum of three tracking stations, located around the globe at approximately 120° apart, is required to ensure that a spacecraft remains under constant observation despite the rotation of E ...
DTU_9e_ch12
... Horsehead Nebula is part of a larger complex of dark interstellar matter, seen in the lower left of this image. Above and to the left of the Horsehead Nebula is the reflection nebula NGC 2023, whose dust grains scatter blue light from stars between us and it more effectively than any other color. Al ...
... Horsehead Nebula is part of a larger complex of dark interstellar matter, seen in the lower left of this image. Above and to the left of the Horsehead Nebula is the reflection nebula NGC 2023, whose dust grains scatter blue light from stars between us and it more effectively than any other color. Al ...
The Cosmic Microwave Background
... researchers will need a new generation of CMB telescopes. In may 14th 2009 the European Space Agency (ESA) launched the PLANCK spacecraft. The higher resolution and lower noise of the Planck satellite allows it to measure further out into the series of acoustic peaks and so gather more information f ...
... researchers will need a new generation of CMB telescopes. In may 14th 2009 the European Space Agency (ESA) launched the PLANCK spacecraft. The higher resolution and lower noise of the Planck satellite allows it to measure further out into the series of acoustic peaks and so gather more information f ...
1 solar and stellar abundances of the elements
... elements. The outer portion of the star escapes into space--perhaps in violent ejection as in supernovae, or perhaps smoothly as in such systems as the double star ~ Herculis. This material may be partly enriched in the heavier dements built up in the stellar interior. As new stars are formed from t ...
... elements. The outer portion of the star escapes into space--perhaps in violent ejection as in supernovae, or perhaps smoothly as in such systems as the double star ~ Herculis. This material may be partly enriched in the heavier dements built up in the stellar interior. As new stars are formed from t ...
Omega Centauri
... These anticorrelations are present in Carretta et al. 2010 all clusters analyzed so far. ...
... These anticorrelations are present in Carretta et al. 2010 all clusters analyzed so far. ...
Document
... • K giant stars • solar-like oscillations from Space Missions: expected amplitudes are 5-20 ppm. Such precision can only be obtained from space. Space also offers the possibility for continuous coverage ...
... • K giant stars • solar-like oscillations from Space Missions: expected amplitudes are 5-20 ppm. Such precision can only be obtained from space. Space also offers the possibility for continuous coverage ...
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.