|
gptkbp:instanceOf
|
stellar classification
|
|
gptkbp:Balmer_lines
|
strongest in A0–A2
|
|
gptkbp:color
|
white
|
|
gptkbp:commonIn
|
young stellar populations
|
|
gptkbp:core_fusion_process
|
hydrogen fusion
|
|
gptkbp:discoveredBy
|
19th century spectral classification
|
|
gptkbp:evolutionary_fate
|
white dwarf
|
|
gptkbp:fraction_of_visible_stars
|
about 1 in 160
|
|
gptkbp:giant_designation
|
gptkb:giant
|
|
gptkbp:helium_lines
|
weak or absent
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
A-type stars
|
|
gptkbp:hydrogen_lines
|
strong
|
|
gptkbp:infrared_excess
|
possible (debris disks)
|
|
gptkbp:lifespan
|
hundreds of millions of years
|
|
gptkbp:location_in_HR_diagram
|
upper left
|
|
gptkbp:luminosity_class
|
V (main sequence)
|
|
gptkbp:magnetic_activity
|
low
|
|
gptkbp:main_sequence_designation
|
gptkb:Elf
|
|
gptkbp:main_sequence_example
|
stellar classification
|
|
gptkbp:main_sequence_luminosity
|
10–50 times solar luminosity
|
|
gptkbp:metal_lines
|
present
|
|
gptkbp:metallic-line_stars
|
gptkb:Am_stars
|
|
gptkbp:notable_variable_type
|
gptkb:Delta_Scuti
gptkb:SX_Phoenicis
|
|
gptkbp:notableExample
|
gptkb:Sirius
gptkb:Vega
gptkb:Deneb
|
|
gptkbp:peculiar_stars
|
gptkb:Ap_stars
|
|
gptkbp:planet_hosting_frequency
|
low
|
|
gptkbp:range
|
1.4–2.1 solar masses
|
|
gptkbp:rare_in
|
old stellar populations
|
|
gptkbp:rotationPeriod
|
gptkb:fire
|
|
gptkbp:spectralType
|
A
|
|
gptkbp:subspecies
|
gptkb:A3
gptkb:A9
gptkb:A5
gptkb:A4
gptkb:A2
gptkb:A6
gptkb:A8
A1
A0
A7
|
|
gptkbp:supergiant_designation
|
supergiant
|
|
gptkbp:surfaceGravity
|
high (main sequence)
lower (giants, supergiants)
|
|
gptkbp:temperature
|
7,500–10,000 K
|
|
gptkbp:ultraviolet_emission
|
moderate
|
|
gptkbp:variant
|
some are variable stars
|
|
gptkbp:X-ray_emission
|
weak
|
|
gptkbp:bfsParent
|
gptkb:Population_I
gptkb:main_sequence
|
|
gptkbp:bfsLayer
|
6
|