HR Diagram Explorer
... An actual HR Diagram is provided in the upper right panel with an active location indicated by a red x. This active location can be dragged around the diagram. The options panel allows you control the variables plotted on the x-axis: (temperature, B-V, or spectral type) and those plotted on the y-ax ...
... An actual HR Diagram is provided in the upper right panel with an active location indicated by a red x. This active location can be dragged around the diagram. The options panel allows you control the variables plotted on the x-axis: (temperature, B-V, or spectral type) and those plotted on the y-ax ...
Brightness + Magnitude of Stars
... A. Apparent or Relative Brightness-(cont.) *** As distance to Star Decreases brightness Increases (Inverse Relationship) *** As Luminosity of Star increases brightness Increases (Direct Relationship) B. Apparent Magnitude A number assigned to a celestial object that is a measure of its relative br ...
... A. Apparent or Relative Brightness-(cont.) *** As distance to Star Decreases brightness Increases (Inverse Relationship) *** As Luminosity of Star increases brightness Increases (Direct Relationship) B. Apparent Magnitude A number assigned to a celestial object that is a measure of its relative br ...
- IRSF: Past and Future
... Study of the gamma-ray binaries via near-infrared photometric monitoring Yuki Moritani (Univ Tokyo/Kavli IPMU) Gamma-ray binaries are a subclass of X-ray binaries that emit the majority of the energy in the gamma-ray band. They are comprised of a compact object and a massive (>10 Msun) star with a c ...
... Study of the gamma-ray binaries via near-infrared photometric monitoring Yuki Moritani (Univ Tokyo/Kavli IPMU) Gamma-ray binaries are a subclass of X-ray binaries that emit the majority of the energy in the gamma-ray band. They are comprised of a compact object and a massive (>10 Msun) star with a c ...
Stars and the Sun
... • They are cooler because they have strong magnetic fields – magnetic fields decrease surrounding pressure and don’t let hot gases ...
... • They are cooler because they have strong magnetic fields – magnetic fields decrease surrounding pressure and don’t let hot gases ...
Brock physics - Brock University
... (b) a very large radius. (c) a very small mass. (d) a very small radius. 23. Stars with masses in excess of 50 solar masses are very common. (a) True. (b) False. 24. The spectroscopic binaries are detected (a) as separate stars in telescopic view. (b) using spectroscopic parallax. (c) based on oscil ...
... (b) a very large radius. (c) a very small mass. (d) a very small radius. 23. Stars with masses in excess of 50 solar masses are very common. (a) True. (b) False. 24. The spectroscopic binaries are detected (a) as separate stars in telescopic view. (b) using spectroscopic parallax. (c) based on oscil ...
Lecture Eight (Powerpoint format) - Flash
... In these cases, the binary period, orbital separation, and masses can all be determined directly. ...
... In these cases, the binary period, orbital separation, and masses can all be determined directly. ...
Outside the Solar System Outside the Solar System OUTSIDE THE
... This means that if you could travel very, very fast— at the same speed that light travels—the trip from Earth to the Sun would take only eight minutes. The sunlight you see now left the Sun ...
... This means that if you could travel very, very fast— at the same speed that light travels—the trip from Earth to the Sun would take only eight minutes. The sunlight you see now left the Sun ...
constellations are not real!
... The celestial sphere is assumed to be fixed, so as the Earth rotates the celestial sphere appears to rotate in the opposite direction once per day. This apparent rotation of the celestial sphere presents us with an obvious means of defining a coordinate system for the surface of the celestial spher ...
... The celestial sphere is assumed to be fixed, so as the Earth rotates the celestial sphere appears to rotate in the opposite direction once per day. This apparent rotation of the celestial sphere presents us with an obvious means of defining a coordinate system for the surface of the celestial spher ...
The Constellation Microscopium, the Microscope Microscopium is a
... The Constellation Microscopium, the Microscope Microscopium is a small constellation in the southern sky, defined in the 18th century by Nicolas Louis de Lacaille in 1751–52 . Its name is Latin for microscope; it was invented by Lacaille to commemorate the compound microscope, i.e. one that uses mor ...
... The Constellation Microscopium, the Microscope Microscopium is a small constellation in the southern sky, defined in the 18th century by Nicolas Louis de Lacaille in 1751–52 . Its name is Latin for microscope; it was invented by Lacaille to commemorate the compound microscope, i.e. one that uses mor ...
Study Guide for 1ST Astronomy Exam
... Draw and label the celestial sphere for an observer at any latitude, Draw the apparent motion of stars as seen by any observer looking North, East, South or West, Use the simplified celestial sphere diagram to determine the visibility of an object and its maximum altitude, given its declinatio ...
... Draw and label the celestial sphere for an observer at any latitude, Draw the apparent motion of stars as seen by any observer looking North, East, South or West, Use the simplified celestial sphere diagram to determine the visibility of an object and its maximum altitude, given its declinatio ...
Astronomy Exam #4
... 26. An O star is known to be eight times the temperature of the Sun and fivr times its radius. What is its luminosity? You may answer either in Watts or in units of solar luminosity. Note: the radius of the Sun is 696,000 km and the temperature of the Sun is 5,800 K. ...
... 26. An O star is known to be eight times the temperature of the Sun and fivr times its radius. What is its luminosity? You may answer either in Watts or in units of solar luminosity. Note: the radius of the Sun is 696,000 km and the temperature of the Sun is 5,800 K. ...
27B Star Life Cycle and the HR Diagram
... all of the known stars were put on their graph, several obvious groups became apparent. By examining the differences in these groups, later astronomers were able to realize that the groups were best described as stars in different periods in their life cycle, rather than completely different types o ...
... all of the known stars were put on their graph, several obvious groups became apparent. By examining the differences in these groups, later astronomers were able to realize that the groups were best described as stars in different periods in their life cycle, rather than completely different types o ...
The Observer Newsletter - the TriState Astronomers
... A visual inspection yields more of these tangential alignments than radial ones in the cluster field, while the parallel field exhibits no such shape distortion. This effect, known as weak gravitational lensing, is a very powerful technique for obtaining galaxy cluster masses independent of any othe ...
... A visual inspection yields more of these tangential alignments than radial ones in the cluster field, while the parallel field exhibits no such shape distortion. This effect, known as weak gravitational lensing, is a very powerful technique for obtaining galaxy cluster masses independent of any othe ...
Star Questions 2008 - Fort Thomas Independent Schools
... Explain what it means for a star to be on the main sequence. Which two pressures act upon any star on the main sequence? Why a star remains roughly the same diameter when on the main sequence. Explain the following relationships: a. Surface temperature and color b. luminosity and mass c. absolute an ...
... Explain what it means for a star to be on the main sequence. Which two pressures act upon any star on the main sequence? Why a star remains roughly the same diameter when on the main sequence. Explain the following relationships: a. Surface temperature and color b. luminosity and mass c. absolute an ...
Pistol Star - University of Dayton
... •When a star dies, it blasts gas and dust into space to form a new nebula. •The nebulae condenses once again into new, second generation stars called population I stars. Example: The sun •Stars begin life with primordial hydrogen and helium mixed with small concentration of heavy elements that we in ...
... •When a star dies, it blasts gas and dust into space to form a new nebula. •The nebulae condenses once again into new, second generation stars called population I stars. Example: The sun •Stars begin life with primordial hydrogen and helium mixed with small concentration of heavy elements that we in ...
Pulsating variable stars and the Hertzsprung
... Stellar spectral classification: a brief story of early steps While Isaac Newton (1643 – 1727) observed the continuous spectrum of the Sun, he missed the discovery of absorption lines. In 1802, William Hyde Wollaston (1766-1828) reported dark gaps between colors in the continuous spectrum. Later, Jo ...
... Stellar spectral classification: a brief story of early steps While Isaac Newton (1643 – 1727) observed the continuous spectrum of the Sun, he missed the discovery of absorption lines. In 1802, William Hyde Wollaston (1766-1828) reported dark gaps between colors in the continuous spectrum. Later, Jo ...
The “Astronomical Horizons” Public Lecture Junk to fill page Series
... optics, testing its suite of instruments as they are delivered one by one, and generally working through the bugs that are normal in such a complex device. Intermixed with this activity has been a series of observations of astronomical objects, which we wish to share with you on these pages. The fir ...
... optics, testing its suite of instruments as they are delivered one by one, and generally working through the bugs that are normal in such a complex device. Intermixed with this activity has been a series of observations of astronomical objects, which we wish to share with you on these pages. The fir ...
Adventurer Pathfinder
... sky. You are looking at the Milky Way through its thickest part. It looks milky because there are over 100 billion stars in our galaxy. If you were able to travel from one edge of our galaxy to the other, it would take you almost 100,000 light-years. ...
... sky. You are looking at the Milky Way through its thickest part. It looks milky because there are over 100 billion stars in our galaxy. If you were able to travel from one edge of our galaxy to the other, it would take you almost 100,000 light-years. ...
Document
... Stars, density has been increasing. • As density increases, the force of gravity on the surface increases. • The greater the force, the higher the escape velocity: – How fast you need to go in order to escape the surface. ...
... Stars, density has been increasing. • As density increases, the force of gravity on the surface increases. • The greater the force, the higher the escape velocity: – How fast you need to go in order to escape the surface. ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.