Xi1 Canis Majoris

Source: Wikipedia, the free encyclopedia.
For other star systems with this Bayer designation, see Xi Canis Majoris.
ξ1 Canis Majoris
Location of ξ1 Canis Majoris (circled)
Observation data
J2000.0
Constellation Canis Major
Right ascension 06h 31m 51.36636s[1]
Declination −23° 25′ 06.3181″[1]
Apparent magnitude (V) 4.33 – 4.36[2]
Characteristics
Spectral type B1 III[3]
U−B color index −0.98[4]
B−V color index −0.24[4]
Variable type β Cep[3]
Distance
1,400 ± 100 ly
(420 ± 40 pc)
Absolute magnitude (MV)−3.86[6]
Details
Myr
HR 2387, SAO 171895, ADS 5176, CCDM
06319-2325
Database references
SIMBADdata

Xi1 Canis Majoris,

light years from Earth
.

ξ1 Canis Majoris is a blue-white

evolutionary tracks suggest that it is a main sequence star about three quarters of the way through its main sequence lifetime.[6]

A light curve for Xi1 Canis Majoris, plotted from TESS data[8]

The apparent magnitude varies from +4.33 to +4.36 with a period of 5.03 hours.[2] Its pulsations cause its radius to vary by 1.0% to 1.5%. At the same time its effective temperature by about 500 K above and below its mean temperature.[6]

ξ1 Canis Majoris has the longest known rotation period of any B class star, taking around 30 years to complete one revolution on its axis.[9] This is thought to be due to magnetic braking; ξ1 Canis Majoris has the strongest magnetic field of any β Cephei star and would be expected to spin down completely in around four million years. It also has the strongest and hardest X-ray emission of any β Cephei star.[6]

ξ1 Canis Majoris forms a naked eye pairing with

emission lines in the spectrum that are best explained by a Be star invisible against the brighter primary.[6]

References

  1. ^
    S2CID 18759600
    .
  2. ^ a b "International Variable Star Index". Retrieved 2018-11-13.
  3. ^
    S2CID 17497112
    .
  4. ^
    Bibcode:1966CoLPL...4...99J
    .
  5. Bibcode:1967IAUS...30...57E
    .
  6. ^
    doi:10.1093/mnras/stx1632
    .
  7. S2CID 119257644
    .
  8. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 20 August 2022.
  9. doi:10.1093/mnrasl/sly070
    .
  10. doi:10.1086/323920
    .
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