First firm spectral classification of an early-B PMS star
... the emerging flux, and the direct detection of the photospheric spectrum turns out to be very difficult at this early stage of evolution (e.g., Testi et al. 2010). Infrared surveys have revealed several hundred candidate massive YSOs, based on luminosity arguments (e.g., Urquhart et al. 2011). A (K ...
... the emerging flux, and the direct detection of the photospheric spectrum turns out to be very difficult at this early stage of evolution (e.g., Testi et al. 2010). Infrared surveys have revealed several hundred candidate massive YSOs, based on luminosity arguments (e.g., Urquhart et al. 2011). A (K ...
The Dimensions Program - Asnuntuck Community College
... Mizar A and Mizar B Another binary system is the Mizar system in the Big Dipper, Figure 5. Mizar A and Mizar B are two stars that rotate around each other every thousands of years or so. It has been known that Mizar A is itself a binary system, and was imaged for the first time by the Optical Interf ...
... Mizar A and Mizar B Another binary system is the Mizar system in the Big Dipper, Figure 5. Mizar A and Mizar B are two stars that rotate around each other every thousands of years or so. It has been known that Mizar A is itself a binary system, and was imaged for the first time by the Optical Interf ...
ppt - Institute for Astronomy
... two deeply embedded source radio continuum sources. One of the two sources is extended along the axis of the HH 1 jet, and it shows very large proper motions. Optical/infrared HST images have revealed a third tiny jet flow. Proper motion studies show that it comes from the extended radio source, ind ...
... two deeply embedded source radio continuum sources. One of the two sources is extended along the axis of the HH 1 jet, and it shows very large proper motions. Optical/infrared HST images have revealed a third tiny jet flow. Proper motion studies show that it comes from the extended radio source, ind ...
New product range (an implementation plan for business expansion)
... with minimal new production and distribution infrastructure being required. There will be some investment in new personnel — two part-time production workers, one new Production Supervisor and one dedicated Product Manager. At eighteen months a review is scheduled which will address any changes or a ...
... with minimal new production and distribution infrastructure being required. There will be some investment in new personnel — two part-time production workers, one new Production Supervisor and one dedicated Product Manager. At eighteen months a review is scheduled which will address any changes or a ...
The search for Earth-like planets - Creation Ministries International
... extrasolar planets. Kepler has only recently undergone initial tests by aiming it at a known extrasolar planet whose star is called HAT-P-7. Scientists are quite excited by the high quality data that will be available from Kepler. Initial tests show the spacecraft is working quite well. The Kepler s ...
... extrasolar planets. Kepler has only recently undergone initial tests by aiming it at a known extrasolar planet whose star is called HAT-P-7. Scientists are quite excited by the high quality data that will be available from Kepler. Initial tests show the spacecraft is working quite well. The Kepler s ...
12 Introduction to Cepheid Variable Stars Exercise
... If you know the distance to the bulb and measure its apparent brightness then you can calculate the wattage of the bulb. Likewise, if you know the wattage of the bulb and measure the observed brightness you can calculate the distance to the bulb. This can be applied to stars, if you determine the ap ...
... If you know the distance to the bulb and measure its apparent brightness then you can calculate the wattage of the bulb. Likewise, if you know the wattage of the bulb and measure the observed brightness you can calculate the distance to the bulb. This can be applied to stars, if you determine the ap ...
Stars: Their Life and Afterlife
... Stars are hottest in their cores and their material cools as one moves outward from the core to the surface. For stars similar to the Sun (with masses ~0.4-4.0 MŸ), during their main-sequence lifetime they have a hydrogen-fusing core with a temperature of a few million degrees and a surface temperat ...
... Stars are hottest in their cores and their material cools as one moves outward from the core to the surface. For stars similar to the Sun (with masses ~0.4-4.0 MŸ), during their main-sequence lifetime they have a hydrogen-fusing core with a temperature of a few million degrees and a surface temperat ...
13.1 Introduction 13.2 The Red Giant Branch
... C is further processed into 16 O via capture of an alpha particle (see Lecture 7.4.3). This is the onset of the helium burning phase of evolution. Unlike H-burning, the reactions involved in He-burning (Lecture 7.4.3) are the same for all stellar masses. However, the conditions in the core at the ig ...
... C is further processed into 16 O via capture of an alpha particle (see Lecture 7.4.3). This is the onset of the helium burning phase of evolution. Unlike H-burning, the reactions involved in He-burning (Lecture 7.4.3) are the same for all stellar masses. However, the conditions in the core at the ig ...
Doppler Effect
... star or planet relative to the Earth. What is meant by a red shift or a blue shift? Given the spectrum of a star and a reference spectrum, identify if the star's spectrum is red or blue shifted, whether the Earth and the star are moving toward or away from each other, and whether the Earth and t ...
... star or planet relative to the Earth. What is meant by a red shift or a blue shift? Given the spectrum of a star and a reference spectrum, identify if the star's spectrum is red or blue shifted, whether the Earth and the star are moving toward or away from each other, and whether the Earth and t ...
JWST_eye - University of Arizona
... In daylight the opening in the human eye is about 1-2 millimeters across. At night the eye becomes “dark adapted” and the opening enlarges to about 6 millimeters to collect more light. The opening of JWST is 6 meters across, about 1000 times larger, so it lets in more light than the naked eye. Since ...
... In daylight the opening in the human eye is about 1-2 millimeters across. At night the eye becomes “dark adapted” and the opening enlarges to about 6 millimeters to collect more light. The opening of JWST is 6 meters across, about 1000 times larger, so it lets in more light than the naked eye. Since ...
Properties of Ellipticals and Spirals
... Velocity dispersions are responsible for the overall shape of galaxies. Oblate and Prolate Ellipticals – how that? Spiral: Velocities of stars in spirals are more ordered. Stars rotate around the galactic center in a disk surrounding it – Halo is random. Spiral galaxies are flattened by rotation (el ...
... Velocity dispersions are responsible for the overall shape of galaxies. Oblate and Prolate Ellipticals – how that? Spiral: Velocities of stars in spirals are more ordered. Stars rotate around the galactic center in a disk surrounding it – Halo is random. Spiral galaxies are flattened by rotation (el ...
Eclipsing Binary Stars as Astrophysical Laboratories
... Earth (Figure 2). Again, this is a light curve, which plots brightness versus time. That’s really the first level of experimental work. If there is an eclipsing binary star we are curious about, we have to measure its light curve and then we go from there. Light curves are different for different ec ...
... Earth (Figure 2). Again, this is a light curve, which plots brightness versus time. That’s really the first level of experimental work. If there is an eclipsing binary star we are curious about, we have to measure its light curve and then we go from there. Light curves are different for different ec ...
Teachers` Manual - Amundsen High School
... Sun's path across the sky changes with seasons The Ecliptic: The sun path across the background sky. High in Summer, low in winter Stars visible near Sun before dawn and after dusk change during year. Sun's shifts its position on celestial sphere with respect to the stars Sun's path = Eclipt ...
... Sun's path across the sky changes with seasons The Ecliptic: The sun path across the background sky. High in Summer, low in winter Stars visible near Sun before dawn and after dusk change during year. Sun's shifts its position on celestial sphere with respect to the stars Sun's path = Eclipt ...
A Search for New Solar-Type Post-T Tauri Stars in
... near- and far-ultraviolet universe. One area of astronomical research that is not well-served by the AIS, due to avoidance of the galactic plane, is young stars. According to Fischer (1998; PhD Thesis, UCSC) only 1% (2/189) of a volume-limited (d < 25 pc) sample of K stars have lithium abundances an ...
... near- and far-ultraviolet universe. One area of astronomical research that is not well-served by the AIS, due to avoidance of the galactic plane, is young stars. According to Fischer (1998; PhD Thesis, UCSC) only 1% (2/189) of a volume-limited (d < 25 pc) sample of K stars have lithium abundances an ...
Astro 204: Practice Questions Some of these questions are a bit
... c. A wind of particles, termed the solar wind, is seen streaming radially from the Sun. It is made mostly of protons and electrons, and at the radius of the Earth’s orbit, has a characteristic speed of 500 km/s, and a density of 7 protons/cm3 . Assuming that the solar wind is emitted uniformly from ...
... c. A wind of particles, termed the solar wind, is seen streaming radially from the Sun. It is made mostly of protons and electrons, and at the radius of the Earth’s orbit, has a characteristic speed of 500 km/s, and a density of 7 protons/cm3 . Assuming that the solar wind is emitted uniformly from ...
First young loose association in the northern hemisphere?
... (Gregorio-Hetem et al. 1992; Kastner et al. 1997). In particular, the SACY project (Torres et al. 2006, 2008) allows to identify many of them and their members. Its sample can be considered as a sub-sample of the RasTyc population in this hemisphere. !!Our spectroscopic observations of the optically ...
... (Gregorio-Hetem et al. 1992; Kastner et al. 1997). In particular, the SACY project (Torres et al. 2006, 2008) allows to identify many of them and their members. Its sample can be considered as a sub-sample of the RasTyc population in this hemisphere. !!Our spectroscopic observations of the optically ...
Aries The Ram - Maverick`s E-portfolio
... were enthralled by a bright star residing in the constellation of Aries known as Hamal. Sumerians believed that Hamal, which means the lamb, was one of the stars in the Scimitar. They believed that the Scimitar was a celestial weapon that protected against the Seven Diabolic Spirits of the Storm[6]. ...
... were enthralled by a bright star residing in the constellation of Aries known as Hamal. Sumerians believed that Hamal, which means the lamb, was one of the stars in the Scimitar. They believed that the Scimitar was a celestial weapon that protected against the Seven Diabolic Spirits of the Storm[6]. ...
Global star formation in the Milky Way from the VIALACTEA
... and history in a normal Galaxy like the Milky Way ? • What are the ingredients determining star formation laws as a function of ISM properties across a full range of galactocentric radii, metallicity and environmental ...
... and history in a normal Galaxy like the Milky Way ? • What are the ingredients determining star formation laws as a function of ISM properties across a full range of galactocentric radii, metallicity and environmental ...
Neutron Stars
... Explanation: The mechanism is basically the same as that of a nova. A neutron star that is part of a binary system will accrete material from the companion. Once enough material is accumulated o nthe surface of the neutron star, hydrogen fusion will occur. ...
... Explanation: The mechanism is basically the same as that of a nova. A neutron star that is part of a binary system will accrete material from the companion. Once enough material is accumulated o nthe surface of the neutron star, hydrogen fusion will occur. ...
9J Gravity and Space
... system was set up more than two thousand years ago, the sun's path was divided into twelve equally spaced "signs," each 30 degrees wide. ...
... system was set up more than two thousand years ago, the sun's path was divided into twelve equally spaced "signs," each 30 degrees wide. ...
Extragalactic Astrophysics 1 AA 2011-2012 Prof. LA Antonelli
... Local Group represents a typical galactic environment: less dense than a galaxy cluster like Virgo or Coma, but contains enough mass to bind the galaxies together Local Group constitutes a great opportunity to study stellar systems close-up: we can resolve stars, analyse their HR diagrams, and deter ...
... Local Group represents a typical galactic environment: less dense than a galaxy cluster like Virgo or Coma, but contains enough mass to bind the galaxies together Local Group constitutes a great opportunity to study stellar systems close-up: we can resolve stars, analyse their HR diagrams, and deter ...
Star Formation in Our Galaxy - Wiley-VCH
... The figure of Orion the Hunter is a familiar sight in the winter sky of the Northern hemisphere. It is one of the most easily recognized constellations and includes one tenth of the 70 brightest stars. Less familiar, perhaps, is the fact that this area is an extraordinarily active site of stellar fo ...
... The figure of Orion the Hunter is a familiar sight in the winter sky of the Northern hemisphere. It is one of the most easily recognized constellations and includes one tenth of the 70 brightest stars. Less familiar, perhaps, is the fact that this area is an extraordinarily active site of stellar fo ...
Stellar Evolution : The Life and Death of Our Luminous Neighbors
... Stellar evolution is inevitable as stars deplete their initial fuel sources. The search for new fuel sources affects the properties of stars as they evolve. This evolution is a process that consists of many different stages with fuel consumption as the dominant life cycles of an evolving star. Stell ...
... Stellar evolution is inevitable as stars deplete their initial fuel sources. The search for new fuel sources affects the properties of stars as they evolve. This evolution is a process that consists of many different stages with fuel consumption as the dominant life cycles of an evolving star. Stell ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.