Stars and Galaxies
... Starlight moving toward Earth shifts to blue-violet end of spectrum Starlight moving away from Earth shifts to red end of spectrum All galaxies outside the Local Group indicate a red shift in their spectra ...
... Starlight moving toward Earth shifts to blue-violet end of spectrum Starlight moving away from Earth shifts to red end of spectrum All galaxies outside the Local Group indicate a red shift in their spectra ...
09astrophysics_2007Nov
... Formula: Distance (pc)=1/parallax Limiting Optical resolution of telescope (due to wave nature of light) limits smallest parallax we can measure ...
... Formula: Distance (pc)=1/parallax Limiting Optical resolution of telescope (due to wave nature of light) limits smallest parallax we can measure ...
Document
... Most of the stars on the HR Diagram are classified as which type of star? ___________________________________________ ...
... Most of the stars on the HR Diagram are classified as which type of star? ___________________________________________ ...
EM review
... The brightest stars: m=1. Dimmest stars (visible to the naked eye) m=6. The magnitude scale has been shown to be logarithmic, with a difference of 5 orders of magnitude corresponding to a factor of 100 in actual brightness. ...
... The brightest stars: m=1. Dimmest stars (visible to the naked eye) m=6. The magnitude scale has been shown to be logarithmic, with a difference of 5 orders of magnitude corresponding to a factor of 100 in actual brightness. ...
Document
... – Semimajor axis: “how far you are away from that something” – Mass: “how much gravity is pulling you around in orbit” ...
... – Semimajor axis: “how far you are away from that something” – Mass: “how much gravity is pulling you around in orbit” ...
Space Science Unit
... So now what? • The stars are plotted on the diagram according to their surface temperature and absolute magnitude. • Once the stars are placed on the diagram, astronomers have noticed clustering of the plotted stars. • These clusters are grouped together into the various stages of a stars life cycl ...
... So now what? • The stars are plotted on the diagram according to their surface temperature and absolute magnitude. • Once the stars are placed on the diagram, astronomers have noticed clustering of the plotted stars. • These clusters are grouped together into the various stages of a stars life cycl ...
Stellar Distances and Magnitudes
... Luminosity vs. Color of Stars • In 1911, Ejnar Hertzsprung investigated the relationship between luminosity and colors of stars in within clusters. • In 1913, Henry Norris Russell did a similar study of nearby stars. ...
... Luminosity vs. Color of Stars • In 1911, Ejnar Hertzsprung investigated the relationship between luminosity and colors of stars in within clusters. • In 1913, Henry Norris Russell did a similar study of nearby stars. ...
Classification_of_Stars_By_Luminosity
... He called the brightest stars in the sky first magnitude and the dimmest visible to the naked eye sixth magnitude. Stars of intermediate brightness were given intermediate values. ...
... He called the brightest stars in the sky first magnitude and the dimmest visible to the naked eye sixth magnitude. Stars of intermediate brightness were given intermediate values. ...
Definitions
... Spectroscopy – is the systematic study of spectra and spectral lines Blackbody – is a hypothetical body that is a perfect absorber and emitter of EMR C spectrum – consists of a continuous range of frequencies w/o either bright or dark lines, appearing as a continuous range of colours E spectrum – co ...
... Spectroscopy – is the systematic study of spectra and spectral lines Blackbody – is a hypothetical body that is a perfect absorber and emitter of EMR C spectrum – consists of a continuous range of frequencies w/o either bright or dark lines, appearing as a continuous range of colours E spectrum – co ...
ASTRONOMY 313
... 6. When the Sun has swollen to full red-giant size (R 0.5 A.U. = 107.5 R), its luminosity will be about 2000 times greater than it is now (i.e. L/L = 2000). Assume that the size of the Earth’s orbit remains unchanged. a. Calculate the Sun’s angular diameter at that time as seen from the Earth. ...
... 6. When the Sun has swollen to full red-giant size (R 0.5 A.U. = 107.5 R), its luminosity will be about 2000 times greater than it is now (i.e. L/L = 2000). Assume that the size of the Earth’s orbit remains unchanged. a. Calculate the Sun’s angular diameter at that time as seen from the Earth. ...
the life cycle of stars
... • Energy is generated in the core and causes the star to shine. • The size of the star changes very little as long as its supply of hydrogen nuclei fuse into helium nuclei. ...
... • Energy is generated in the core and causes the star to shine. • The size of the star changes very little as long as its supply of hydrogen nuclei fuse into helium nuclei. ...
Astronomical terms and constants
... MB = absolute blue magnitude of a star; B indicates that we are referring to that part of stellar radiation that is emitted in the “blue” part of the spectrum, i.e. at about 4 × 10−5 cm, 4000 Å. mbol = Mbol + 5 log (d/10pc) = apparent bolometric magnitude of a star at a distance d . V = MV + 5 log ...
... MB = absolute blue magnitude of a star; B indicates that we are referring to that part of stellar radiation that is emitted in the “blue” part of the spectrum, i.e. at about 4 × 10−5 cm, 4000 Å. mbol = Mbol + 5 log (d/10pc) = apparent bolometric magnitude of a star at a distance d . V = MV + 5 log ...
24-2 Characteristics of Stars
... Color and Temperature of Stars • Coolest stars = red • Hot stars = white • Hottest stars = bluewhite ...
... Color and Temperature of Stars • Coolest stars = red • Hot stars = white • Hottest stars = bluewhite ...
Boötes
Boötes /boʊˈoʊtiːz/ is a constellation in the northern sky, located between 0° and +60° declination, and 13 and 16 hours of right ascension on the celestial sphere. The name comes from the Greek Βοώτης, Boōtēs, meaning herdsman or plowman (literally, ox-driver; from βοῦς bous “cow”). The ""ö"" in the name is a diaeresis, not an umlaut, meaning that each 'o' is to be pronounced separately.One of the 48 constellations described by the 2nd century astronomer Ptolemy, Boötes is now one of the 88 modern constellations. It contains the fourth brightest star in the night sky, the orange-hued Arcturus. Boötes is home to many other bright stars, including eight above the fourth magnitude and an additional 21 above the fifth magnitude, making a total of 29 stars easily visible to the naked eye.