Phi Boötis

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Template:Short description

Phi Boötis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Boötes
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +5.24[2]
Characteristics
Evolutionary stage red clump[3]
Spectral type G7 III-IV Fe-2[4]
U−B Template:Engvar +0.53[2]
B−V Template:Engvar +0.88[2]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[5] km/s
Proper motion (μ) RA: +61.380 mas/yr[1]
Dec.: +59.791 mas/yr[1]
Parallax (π)18.5752±0.0555 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+1.67[6]
Details
Mass1.43[6] Template:Solar mass
Radius5[5] Template:Solar radius
Luminosity17[5] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[7] cgs
TemperatureScript error: No such module "val".[7] K
Metallicity [Fe/H]Script error: No such module "val".[7] dex
Rotational velocity (v sin i)0.0[5] km/s
Age3.16[6] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[8]
Database references
SIMBADdata

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Phi Boötis is a single,[9] yellow-hued star in the northern constellation of Boötes. Its name is a Bayer designation that is Latinized from φ Boötis, and abbreviated Phi Boo or φ Boo. This star is dimly visible to the naked eye with an apparent visual magnitude of +5.24.[2] Based upon an annual parallax shift of Script error: No such module "val". as seen from the Earth,[1] it is located Script error: No such module "convert". from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.09 due to interstellar dust.[6] It is moving closer to the Sun with a radial velocity of −10.6 km/s.[5]

The stellar classification of Phi Boötis is G7 III-IV Fe-2,[4] which would suggest it is an evolving G-type star that shows spectral traits of both a subgiant and a giant star. However, Alves (2000) has it listed as a member of the so-called "red clump", indicating that it is an aging giant star that is generating energy through helium fusion at its core.[3] The 'Fe-2' suffix notation in its class means that it displays a significant underabundance of iron in its spectrum. Around three billion years old,[6] Phi Boötis has an estimated 1.43[6] times the mass of the Sun and 5[5] times the Sun's radius. It is radiating 17[5] times the Sun's luminosity from its enlarged photosphere at an effective temperature of about 4,945 K.[7]

References

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  1. ↑ a b c d e Template:Cite Gaia DR3
  2. ↑ a b c d Script error: No such module "citation/CS1".
  3. ↑ a b Script error: No such module "citation/CS1".
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ a b c d e f g Script error: No such module "citation/CS1".
  6. ↑ a b c d e f Script error: No such module "citation/CS1".
  7. ↑ a b c d Script error: No such module "citation/CS1".
  8. ↑ Template:Cite simbad
  9. ↑ Script error: No such module "citation/CS1".

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References

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Template:Stars of Boötes

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