Starbirth and Interstellar Matter
... B. Stars that look redder than their spectral type. C. Bluish nebulas around hot stars. D. Hot hydrogen clouds glowing bright red. 2. Neutral hydrogen (HI) gas can be detected in interstellar space by its: A. emission lines at millimeter wavelengths. B. absorption lines at optical wavelengths. C. 21 ...
... B. Stars that look redder than their spectral type. C. Bluish nebulas around hot stars. D. Hot hydrogen clouds glowing bright red. 2. Neutral hydrogen (HI) gas can be detected in interstellar space by its: A. emission lines at millimeter wavelengths. B. absorption lines at optical wavelengths. C. 21 ...
HR Diagram
... Later research by Adams and Kohlschutter at the Mt. Wilson Observatory showed that it was possible to tell not only the temperature of a star by its spectra, but also whether it was an average star (called mainsequence), a giant, or a white dwarf. Several classifications of stars were identified fro ...
... Later research by Adams and Kohlschutter at the Mt. Wilson Observatory showed that it was possible to tell not only the temperature of a star by its spectra, but also whether it was an average star (called mainsequence), a giant, or a white dwarf. Several classifications of stars were identified fro ...
Test 1 - Brock physics
... (a) red dwarfs. (b) brown dwarfs. (c) black dwarfs. (d) black holes. 28. A type Ia supernova occurs because of (a) the core collapse of a medium-mass star. (b) the core collapse of a high-mass star. (c) matter from a nearby star falling onto the surface of a white dwarf, becoming compressed and heat ...
... (a) red dwarfs. (b) brown dwarfs. (c) black dwarfs. (d) black holes. 28. A type Ia supernova occurs because of (a) the core collapse of a medium-mass star. (b) the core collapse of a high-mass star. (c) matter from a nearby star falling onto the surface of a white dwarf, becoming compressed and heat ...
Constellations - Mayo Dark Sky Park
... knows what stories are ancestors here created when they saw this giant in the night sky? Let your imagination wander as you learn about the patterns of stars forming constellations and the legends and myths that have been attached to them over thousands of years. ...
... knows what stories are ancestors here created when they saw this giant in the night sky? Let your imagination wander as you learn about the patterns of stars forming constellations and the legends and myths that have been attached to them over thousands of years. ...
Chapter 20 Notes (smaller PDF file)
... • The sequence of thermonuclear reactions stops here, because the formation of elements heavier than iron requires an input of ...
... • The sequence of thermonuclear reactions stops here, because the formation of elements heavier than iron requires an input of ...
every star in the cluster.
... This is just one relatively brief stage on the way to stellar demise. The globular cluster in the figure just above has a lot of red giants, continually forming from evolving stars near the turnoff. But there were originally many stars that were even more massive, that became red giants for a time, ...
... This is just one relatively brief stage on the way to stellar demise. The globular cluster in the figure just above has a lot of red giants, continually forming from evolving stars near the turnoff. But there were originally many stars that were even more massive, that became red giants for a time, ...
Observations of V838 Mon light echo
... In classical novae, hydrogen explosion happens in a layer on a white dwarf surface. A small amount of matter located above being ejected into space has a mass of 1/1000 or 1/10000 solar masses. When the ejected gas expands, its density decreases rapidly, it passes into the optically thin state and g ...
... In classical novae, hydrogen explosion happens in a layer on a white dwarf surface. A small amount of matter located above being ejected into space has a mass of 1/1000 or 1/10000 solar masses. When the ejected gas expands, its density decreases rapidly, it passes into the optically thin state and g ...
Binary Stars
... We detect the existence of a binary because a star ‘wobbles’ in position as it moves across the sky. Sirius is a good example: ...
... We detect the existence of a binary because a star ‘wobbles’ in position as it moves across the sky. Sirius is a good example: ...
Lecture Ten - The Sun Amongst the Stars Part II
... The reason behind this relationship between mass and luminosity in stars first began to become clear in the early 20 th century, when physicists like Einstein revealed that atoms possess a type of potential energy based only on how massive they are. This mass energy can be changed by altering the at ...
... The reason behind this relationship between mass and luminosity in stars first began to become clear in the early 20 th century, when physicists like Einstein revealed that atoms possess a type of potential energy based only on how massive they are. This mass energy can be changed by altering the at ...
Stars: flux, luminosity, color, and temperature
... `magnitude’ groups according to how bright they looked to his eye. • Herschel (1800s) first measured the brightness of stars quantitatively and matched his measurements onto Ptolemy’s magnitude groups and assigned a number for the magnitude of each star. ...
... `magnitude’ groups according to how bright they looked to his eye. • Herschel (1800s) first measured the brightness of stars quantitatively and matched his measurements onto Ptolemy’s magnitude groups and assigned a number for the magnitude of each star. ...
Exam 03
... 38. What information does the luminosity class of a star provide? A) Brightness: Higher luminosity class indicates a higher apparent magnitude, which actually means a dimmer star as viewed from Earth. B) Temperature: Stars with a higher luminosity class have a higher temperature. C) Mass: The higher ...
... 38. What information does the luminosity class of a star provide? A) Brightness: Higher luminosity class indicates a higher apparent magnitude, which actually means a dimmer star as viewed from Earth. B) Temperature: Stars with a higher luminosity class have a higher temperature. C) Mass: The higher ...
Basic Properties of Stars
... Astronomers originally classified the spectra of stars A through O based on the amount of hydrogen absorption. But since hydrogen absorption is strongest at intermediate temperatures, this sequence was wrong! 14 ...
... Astronomers originally classified the spectra of stars A through O based on the amount of hydrogen absorption. But since hydrogen absorption is strongest at intermediate temperatures, this sequence was wrong! 14 ...
Document
... • In Lab 2 we talked about spectral lines and how they apply to hot and cool gases. • Let’s look at some hot and cool gases in space. ...
... • In Lab 2 we talked about spectral lines and how they apply to hot and cool gases. • Let’s look at some hot and cool gases in space. ...
Masses are much harder than distance, luminosity, or temperature
... • Range of different mass stars! ...
... • Range of different mass stars! ...
Foundation 1 - Discovering Astronomy
... • The energy produced by hydrogen fusion in this layer just outside the core causes the rest of the star to expand into a giant star. ...
... • The energy produced by hydrogen fusion in this layer just outside the core causes the rest of the star to expand into a giant star. ...
Earth Science Notes
... Main Sequence to Giant Stars When hydrogen in a star is depleted, the fusion process begins to stop. The core collapses and heats up. The outer layers of the star begin to cool and expand. This stage of the life cycle is ...
... Main Sequence to Giant Stars When hydrogen in a star is depleted, the fusion process begins to stop. The core collapses and heats up. The outer layers of the star begin to cool and expand. This stage of the life cycle is ...
Exploring The Universe
... • Spectral lines reveal the composition of stars. • The spectra of most stars have dark lines caused by gases in the outer layers that absorb light at that wavelength. • Each element produces a unique pattern of spectral lines. ...
... • Spectral lines reveal the composition of stars. • The spectra of most stars have dark lines caused by gases in the outer layers that absorb light at that wavelength. • Each element produces a unique pattern of spectral lines. ...
DTU 8e Chap 17 Quasars and Other Active Galaxies
... An active galaxy is an extremely luminous galaxy that has one or more unusual features: an unusually bright, starlike nucleus; strong emission lines in its spectrum; rapid variations in luminosity; and jets or beams of radiation that emanate from its core. Active galaxies include quasars, Seyfert ga ...
... An active galaxy is an extremely luminous galaxy that has one or more unusual features: an unusually bright, starlike nucleus; strong emission lines in its spectrum; rapid variations in luminosity; and jets or beams of radiation that emanate from its core. Active galaxies include quasars, Seyfert ga ...
Planetary Nebula
... What resemble dainty butterfly wings are actually roiling cauldrons of gas heated to more than 36,000 degrees Fahrenheit. The gas is tearing across space at more than 600,000 miles an hour -- fast enough to travel from Earth to the moon in 24 minutes! A dying star that was once about five times the ...
... What resemble dainty butterfly wings are actually roiling cauldrons of gas heated to more than 36,000 degrees Fahrenheit. The gas is tearing across space at more than 600,000 miles an hour -- fast enough to travel from Earth to the moon in 24 minutes! A dying star that was once about five times the ...
epsilon Aur
... Epsilon Aurigae is not the brightest eclipsing binary, nor is it the one with the deepest eclipses. What makes it distinctive is its long period of over 27 years, coupled with the mystery surrounding the nature of the secondary object in the system. The last primary eclipse took place during 1982-84 ...
... Epsilon Aurigae is not the brightest eclipsing binary, nor is it the one with the deepest eclipses. What makes it distinctive is its long period of over 27 years, coupled with the mystery surrounding the nature of the secondary object in the system. The last primary eclipse took place during 1982-84 ...
Question 1 The star Regulus, in the constellation Leo, appears
... . 2. elliptical galaxies with bright, starlike nuclei. ...
... . 2. elliptical galaxies with bright, starlike nuclei. ...
- EPJ Web of Conferences
... is a quantification of the dramatically plateau-like relation between element ratios and [Fe/H] across the range of abundances relevant to Galactic halo stars. For clarity we note that the systematically low ratios of [/Fe] seen in dSph stars, compared to Galactic stars of comparable [Fe/H], do not ...
... is a quantification of the dramatically plateau-like relation between element ratios and [Fe/H] across the range of abundances relevant to Galactic halo stars. For clarity we note that the systematically low ratios of [/Fe] seen in dSph stars, compared to Galactic stars of comparable [Fe/H], do not ...
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.