Statements (45)
| Predicate | Object |
|---|---|
| gptkbp:instance_of |
gptkb:star
|
| gptkbp:bfsLayer |
3
|
| gptkbp:bfsParent |
gptkb:star
|
| gptkbp:adaptation |
from main sequence to horizontal branch
|
| gptkbp:age |
approximately 10 billion years
|
| gptkbp:application |
stellar evolution and galactic dynamics
|
| gptkbp:associated_with |
gptkb:Type_I_Cepheid_variables
|
| gptkbp:average_temperature |
around 5,000 to 7,500 K
|
| gptkbp:color |
yellow to orange
|
| gptkbp:contains |
gptkb:Type_II_Cepheid_variables
|
| gptkbp:contributed_to |
cosmological distance ladder
|
| gptkbp:contribution |
understanding of stellar populations
|
| gptkbp:discovered_by |
1901
the constellation Lyra |
| gptkbp:distribution |
found in the halo of the Milky Way
|
| gptkbp:example |
RR Lyrae, XZ Cygni, and V1 in M3
|
| gptkbp:features |
strong hydrogen lines
|
| gptkbp:has_color |
B-V index around 0.3 to 0.5
|
| gptkbp:has_luminosity |
approximately 100 times that of the Sun
|
| gptkbp:has_spectral_type |
A to F type
|
| gptkbp:has_variants |
radial pulsation
|
| gptkbp:historical_period |
typically 0.5 to 1 day
|
| gptkbp:historical_significance |
first standard candles for distance measurement
|
| https://www.w3.org/2000/01/rdf-schema#label |
RR Lyrae Stars
|
| gptkbp:instrument |
0.3 to 2.0 magnitudes
|
| gptkbp:is_found_in |
globular clusters
|
| gptkbp:is_observed_in |
amateur astronomers
various galaxies |
| gptkbp:is_used_for |
distance measurement in astronomy
|
| gptkbp:lighting |
due to pulsation
characteristic sawtooth shape approximately 10 to 16 magnitude periodic and regular |
| gptkbp:mass |
0.5 to 1.0 solar masses
|
| gptkbp:metallicity |
typically low metallicity
|
| gptkbp:mode |
fundamental and first overtone modes
|
| gptkbp:named_after |
gptkb:RR_Lyrae
|
| gptkbp:notable_traits |
short pulsation periods and low metallicity
|
| gptkbp:origin |
horizontal branch stars
|
| gptkbp:photography |
Johnson and Cousins systems
|
| gptkbp:range |
up to 100,000 light-years
|
| gptkbp:research |
photometry and spectroscopy
faintness and variability |
| gptkbp:strategic_importance |
stellar population studies
|
| gptkbp:type |
pulsating variable star
|