The Extragalactic Distance Database: Color–Magnitude Diagrams
... The helium falling on the core from the outer shell drives this increase in temperature, and hence the degeneracy is broken when the core mass crosses the threshold for helium burning. This mass threshold, therefore, determines an upper limit to the luminosity of Red Giants. The flux from these star ...
... The helium falling on the core from the outer shell drives this increase in temperature, and hence the degeneracy is broken when the core mass crosses the threshold for helium burning. This mass threshold, therefore, determines an upper limit to the luminosity of Red Giants. The flux from these star ...
The Magnitude Scale
... The scale below is given as an instructive tool, to give a general idea of how the magnitude scale works. The scale below is intended to be roughly visual; the human eye's (dark-adapted) detection efficiency peaks around 495 nanometers, while the formal photoelectric V peak (a filtered band intended ...
... The scale below is given as an instructive tool, to give a general idea of how the magnitude scale works. The scale below is intended to be roughly visual; the human eye's (dark-adapted) detection efficiency peaks around 495 nanometers, while the formal photoelectric V peak (a filtered band intended ...
The correct answers are written in bold, italic and underlined. The
... • scattering of this light from rapidly moving material, this light being Dopplershifted toward the red end of the spectrum. Fine particles of dust scatter blue light preferentially in a process similar to that which operates in our own atmosphere to produce the blue sky. 7. Which of the following m ...
... • scattering of this light from rapidly moving material, this light being Dopplershifted toward the red end of the spectrum. Fine particles of dust scatter blue light preferentially in a process similar to that which operates in our own atmosphere to produce the blue sky. 7. Which of the following m ...
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. ...
Date_________________ TWINKLE, TWINKLE
... The second property is apparent magnitude (m). Apparent magnitude is how bright a star actually appears from Earth and it does depend on distance. Because of the way the magnitude scale is set up, the brightest stars will have large negative magnitude values while dim stars will have large positive ...
... The second property is apparent magnitude (m). Apparent magnitude is how bright a star actually appears from Earth and it does depend on distance. Because of the way the magnitude scale is set up, the brightest stars will have large negative magnitude values while dim stars will have large positive ...
the stars
... magnitude versus spectral type and obtained the diagram. Today we can use the Virtual Observatory tools, so we do not need to perform astronomical observations during the night. We will observe in Stellarium the 25 brightest stars of the sky and then plot their spectral type versus absolute magnitud ...
... magnitude versus spectral type and obtained the diagram. Today we can use the Virtual Observatory tools, so we do not need to perform astronomical observations during the night. We will observe in Stellarium the 25 brightest stars of the sky and then plot their spectral type versus absolute magnitud ...
The Lives of Stars
... formation and evolution • Newborn stars may form an open or galactic cluster • Stars are held together in such a cluster by gravity • Occasionally a star moving more rapidly than average will escape, or “evaporate,” from such a cluster • A stellar association is a group of newborn stars that are mov ...
... formation and evolution • Newborn stars may form an open or galactic cluster • Stars are held together in such a cluster by gravity • Occasionally a star moving more rapidly than average will escape, or “evaporate,” from such a cluster • A stellar association is a group of newborn stars that are mov ...
Studying the Stars
... Pogson assigned the brightest stars the first order of magnitude (magnitude = 1), and dimmer stars were 2nd, 3rd, 4th order, etc. (magnitudes = 2, 3, 4, etc.) Now that we can be more accurate in our measurements, stars can have more specific magnitudes like 1.5, 6.73, etc. and even negative numbers ...
... Pogson assigned the brightest stars the first order of magnitude (magnitude = 1), and dimmer stars were 2nd, 3rd, 4th order, etc. (magnitudes = 2, 3, 4, etc.) Now that we can be more accurate in our measurements, stars can have more specific magnitudes like 1.5, 6.73, etc. and even negative numbers ...
8.1 Stars
... core is under so much gravitational force that nothing can stop its collapse, not even the formation of neutrons. In this case, the effect of gravity is so great that space, time, light, and other matter all start to fall into a single ...
... core is under so much gravitational force that nothing can stop its collapse, not even the formation of neutrons. In this case, the effect of gravity is so great that space, time, light, and other matter all start to fall into a single ...
Absolute magnitude
... The Sun is the brightest star in the sky, with an apparent magnitude of about -26.5 Sirius is next in line, with an apparent magnitude of -1.5; how many times brighter is the Sun than Sirius? a) 25 ...
... The Sun is the brightest star in the sky, with an apparent magnitude of about -26.5 Sirius is next in line, with an apparent magnitude of -1.5; how many times brighter is the Sun than Sirius? a) 25 ...
MESSIER - EarthLink
... His first own deep sky discovery of globular cluster M3, cataloged on May 3, probably causes him to undertake a systematical search for nebulous objects, leading to the observation and recording of the objects M3-M40, many of which were own discoveries, but several from old catalogs. Messier was mad ...
... His first own deep sky discovery of globular cluster M3, cataloged on May 3, probably causes him to undertake a systematical search for nebulous objects, leading to the observation and recording of the objects M3-M40, many of which were own discoveries, but several from old catalogs. Messier was mad ...
here - British Astronomical Association
... section on the types of variable star and other much useful information. Cataclysmic Variable Stars Coel Hellier, Springer-Praxis ISBN 1-85233-211-5, How and why they vary. An excellent introduction to this most interesting topic. Understanding Variable Stars John Percy, CUP ISBN 978-0-521-23253-1. ...
... section on the types of variable star and other much useful information. Cataclysmic Variable Stars Coel Hellier, Springer-Praxis ISBN 1-85233-211-5, How and why they vary. An excellent introduction to this most interesting topic. Understanding Variable Stars John Percy, CUP ISBN 978-0-521-23253-1. ...
Lecture 9a: More on Star formation and evolution 10/22
... charge (2 for He and 4 for Be). Therefore need about 100,000,000 degrees K for He burning ! Stars like our Sun remain main sequence longer due to this PHYS 162 ...
... charge (2 for He and 4 for Be). Therefore need about 100,000,000 degrees K for He burning ! Stars like our Sun remain main sequence longer due to this PHYS 162 ...
Powerpoint
... These are Brown Dwarfs or failed stars. Very difficult to detect because so faint. First seen in 1994 with Palomar 200”. How many are there? ...
... These are Brown Dwarfs or failed stars. Very difficult to detect because so faint. First seen in 1994 with Palomar 200”. How many are there? ...
Pre-Lab
... The word “galaxy,” having been used in English since the fourteenth century, is as old as this language. Galaxy was derived from the French, Greek, and Latin words for milk. To pre-industrial people, lacking bright lights, the Milky Way, a band of diffuse light stretching across the dark sky, would ...
... The word “galaxy,” having been used in English since the fourteenth century, is as old as this language. Galaxy was derived from the French, Greek, and Latin words for milk. To pre-industrial people, lacking bright lights, the Milky Way, a band of diffuse light stretching across the dark sky, would ...
The Big Dipper is a
... Groups of stars making an apparent pattern in the celestial sphere Groups of stars gravitationally bound and appearing close together in the sky ...
... Groups of stars making an apparent pattern in the celestial sphere Groups of stars gravitationally bound and appearing close together in the sky ...
Review: How does a star`s mass determine its life story?
... Two Types of Supernova Massive star supernova: Iron core of massive star reaches white dwarf limit and collapses into a neutron star, causing explosion White dwarf supernova: Carbon fusion suddenly begins as white dwarf in close binary system reaches white dwarf limit, causing total explosion ...
... Two Types of Supernova Massive star supernova: Iron core of massive star reaches white dwarf limit and collapses into a neutron star, causing explosion White dwarf supernova: Carbon fusion suddenly begins as white dwarf in close binary system reaches white dwarf limit, causing total explosion ...
June 2013 Kepler Space Telescope Update
... instead a frenetic region of star formation. The galaxy, a spiral beauty called Messier 94, is located about 17 million light-years away. In this image from NASA's Spitzer Space Telescope, infrared light is represented in different colors, with blue having the shortest wavelengths and red, the longe ...
... instead a frenetic region of star formation. The galaxy, a spiral beauty called Messier 94, is located about 17 million light-years away. In this image from NASA's Spitzer Space Telescope, infrared light is represented in different colors, with blue having the shortest wavelengths and red, the longe ...
Chapter 15
... Hubble’s Galaxy Classification Elliptical galaxies have no spiral arms and no disk. They come in many sizes, from giant ellipticals of trillions of stars, down to dwarf ellipticals of less than a million stars. Ellipticals also contain very little, if any, cool gas and dust, and they show no eviden ...
... Hubble’s Galaxy Classification Elliptical galaxies have no spiral arms and no disk. They come in many sizes, from giant ellipticals of trillions of stars, down to dwarf ellipticals of less than a million stars. Ellipticals also contain very little, if any, cool gas and dust, and they show no eviden ...
Stellar Evolution Review
... a) go through a red giant phase and end its life as a white dwarf. b) not go through a red giant phase and end its life as a white dwarf. c) go through a red giant phase and end its life as a black hole. d) not go through a red giant phase and end its life as a black hole. ...
... a) go through a red giant phase and end its life as a white dwarf. b) not go through a red giant phase and end its life as a white dwarf. c) go through a red giant phase and end its life as a black hole. d) not go through a red giant phase and end its life as a black hole. ...
Astronomical Distance Determination
... the period of the brightness variation and the average luminosity of the star. Cepheid variables are also very bright and can be seen from far away. (They are not main sequence stars). A complication though is that there are two populations of Cepheids and they have different period luminosity relat ...
... the period of the brightness variation and the average luminosity of the star. Cepheid variables are also very bright and can be seen from far away. (They are not main sequence stars). A complication though is that there are two populations of Cepheids and they have different period luminosity relat ...
Astronomy Exam #4
... 13. Which of the statements below is true regarding the two stars marked α and γ? A. Star α is less luminous than star γ. B. Star α has a longer main sequence lifetime than star γ. C. Star α appears brighter that star γ. D. Star α is larger in radius than star γ. 14. Which statement is the most corr ...
... 13. Which of the statements below is true regarding the two stars marked α and γ? A. Star α is less luminous than star γ. B. Star α has a longer main sequence lifetime than star γ. C. Star α appears brighter that star γ. D. Star α is larger in radius than star γ. 14. Which statement is the most corr ...
1 How luminous are stars?
... Mass: from period (p) and average separation (a) of binary-star orbit ...
... Mass: from period (p) and average separation (a) of binary-star orbit ...
Distances to the Stars in Leo
... Background and Theory If the distance to the star is known via its measured parallax (as it was discussed in class), it is a somewhat easyl matter for astronomers, or anyone else for that matter, to determine the absolute magnitude of the star using the distance-magnitude relation. However, most sta ...
... Background and Theory If the distance to the star is known via its measured parallax (as it was discussed in class), it is a somewhat easyl matter for astronomers, or anyone else for that matter, to determine the absolute magnitude of the star using the distance-magnitude relation. However, most sta ...
Luminosity - UCF Physics
... measure its distance and apparent brightness: Luminosity = 4π (distance)2 x (Brightness) Note that there is a huge range in stellar ...
... measure its distance and apparent brightness: Luminosity = 4π (distance)2 x (Brightness) Note that there is a huge range in stellar ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.