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physical object > natural object > celestial body > star > Population I star > Population I Cepheid |
Population I Cepheid (classical Cepheid, young disk Cepheid) | ||||
subject | fact |
Population I Cepheid | has period 5-10 days | |
has absolute magnitude <Mv> = -0.5 to -6 | ||
has synonym classical Cepheid | ||
has synonym young disk Cepheid | ||
has definition A Cepheid which is about 4 times more luminous than Population II Cepheids, probably because of their higher metal content (although mass may also be a factor). | ||
is a kind of Cepheid | ||
is a kind of Population I star | ||
Population I star | has author Baade (1944) | |
is a part of disk | ||
Cepheid | has prototype delta Cephei | |
has spectral type F star, G star and K star | ||
star | has star surface temperature | |
has V magnitude | ||
has B magnitude | ||
has U magnitude | ||
has position on celestial sphere from the point of view of Earth | ||
has parallax from the point of view of Earth's orbit | ||
has proper motion | ||
has radiation at surface which is diffused out from the hotter core | ||
has energy source gravitational contraction and or fusion | ||
has energy production which takes place primarily within the core | ||
has surface density which depends on luminosity class | ||
has surface temperature greater than 1000 Kelvin | ||
has apparent magnitude | ||
has age | ||
has catalog star catalog | ||
has material hydrogen, helium | ||
has velocity determined from proper motion and radial velocity | ||
has mass greater than 0.08 the sun's mass | ||
celestial body | has spectra | |
variable | has name designated with
| |
has observational problem some difficulty in distinguishing between various kinds | ||
has observable variation time scale within a period of decades | ||
has light curve | ||
has optical brightness variation 0.2 magnitudes or greater | ||
has amplitude | ||
physical object | has location or center of gravity | |
has angular momentum | ||
has momentum | ||
has temperature | ||
has volume | ||
has extent |
Kinds of Population I Cepheid :
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