Pi5 Orionis

Source: Wikipedia, the free encyclopedia.
For other stars with this Bayer designation, see Pi Orionis.
π5 Orionis
Location of π5 Orionis (circled)
Observation data
ICRS
)
Constellation Orion
Right ascension 04h 54m 15.09604s[1]
Declination +02° 26′ 26.4231″[1]
Apparent magnitude (V) 3.69[2]
Characteristics
Spectral type B2 III[3]
U−B color index −0.81[2]
B−V color index −0.18[2]
Variable type
Ellipsoidal[4] (SPB?)[5]
Distance
approx. 1,300 ly
(approx. 410 pc)
Absolute magnitude (MV)−4.3[7]
Semi-amplitude
(K1)
(primary)		60.41±1.99 km/s
Details
π5 Ori A
Myr
π5 Ori B
Mass5.0[5] M☉
Radius2.8 - 3.8[5] R☉
Luminosity525 - 741[5] L☉
Surface gravity (log g)3.98 - 4.24[5] cgs
Temperature15,596 - 16,520[5] K
HIP 22797, HR 1567, SAO 112197[12]
Database references
SIMBADdata

Pi5 Orionis (π5 Ori, π5 Orionis) is a

mas,[1] it is around 1,300 light-years distant from the Sun
.

A light curve for Pi5 Oronis, plotted from TESS data[13]

This is a single-lined

ellipsoidal variable, which means the orbit is sufficiently close that the shapes of the components are being distorted by their mutual gravitation. This is causing the visual magnitude of the system to vary regularly by 0m.05 over the course of each orbit, as the orientation of the stars change with respect to the Earth.[4] Detailed analysis of the light curve suggests that the primary star is also pulsating and is probably a Slowly pulsating B-type star.[5]

The primary component is a

mass of the Sun and radiates 11,262[8] times the solar luminosity from its outer atmosphere at an effective temperature of 14,496 K.[8]

The secondary star is not detectable clearly, but modelling of the brightness variations and orbit suggest that it is a

main sequence star with a spectral class of about B6. It is smaller, cooler, and much less luminous than the primary, and orbits at about 26 astronomical units.[5]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    doi:10.1086/111220
    .
  3. ^
    S2CID 119120749
    .
  4. ^
    doi:10.1086/163359
    .
  5. ^
    doi:10.1093/mnras/staa1665
    .
  6. Bibcode:1967IAUS...30...57E
    .
  7. S2CID 119257644
    .
  8. ^
    S2CID 118665352
    .
  9. ^
    S2CID 118362423
    .
  10. ^
    doi:10.1086/423795
    .
  11. ^
    S2CID 118629873
    .
  12. ^ "pi.05 Ori". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-11-18.{{cite web}}: CS1 maint: postscript (link)
  13. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 9 December 2022.
  14. S2CID 119387088
    .

External links
Retrieved from "https://en.wikipedia.org/w/index.php?title=Pi5_Orionis&oldid=1126867121"