BK Camelopardalis

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BK Camelopardalis
Location of BK Camelopardalis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation
Camelopardalis
Right ascension 03h 19m 59.27222s[1]
Declination +65° 39′ 08.2519″[1]
Apparent magnitude (V) 4.74[2] (4.76 - 4.90)[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type B2.5 Vne[5]
U−B color index −0.77[6]
B−V color index −0.108±0.002[2]
R−I color index −0.13[6]
Variable type Be star[3]
Distance
540 ± 30 ly
(165 ± 10 pc)
Absolute magnitude (MV)−2.07[2]
Details
Myr
HR 985, SAO 12704[8]
Database references
SIMBADdata

BK Camelopardalis is a

light years away from the Sun based on parallax.[1] It is a proposed member of the Cassiopeia–Taurus group of co-moving stars.[9]

Description

This is a

spectrum has been known since at least 1895.[10] Spectrograms of the star have been taken since 1905, providing a long history of its cycles of variation.[11] It ranges in brightness from a peak of 4.76 down to 4.90.[3]

BK Camelopardalis is 32

luminosity of the Sun from its photosphere at an effective temperature of 18,720 K.[4]

This star lies at the center of a circular, disk-like structure spanning 1.4°, which may be a "magnetic funnel-like structure" that is emitting in the radio band. Neutral hydrogen along the trajectory of this star has been found to be deficient, which may be the result of ionizing radiation from the star.[12]

Two stars have been resolved close to BK Camelopardalis. The first, designated Ab, is separated by about 0.13 arcseconds. If it is physically associated with BK Camelopardalis, it would have an orbital period of several decades. The second star is designated as B but is likely an optical pair with the central BK Camelopardalis; that is, a chance alignment.[13]

Chinese name

In

α Draconis, κ Draconis, λ Draconis, 24 Ursae Majoris, 43 Camelopardalis and α Camelopardalis.[14] Consequently, BK Camelopardalis itself is known as 紫微右垣七 (Zǐ Wēi Yòu Yuán qī, English: the Seventh Star of Right Wall of Purple Forbidden Enclosure.) representing 上丞 (Shǎngchéng), meaning First Prime Minister.[15]

References

  1. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  2. ^
    S2CID 119257644
    .
  3. ^
    S2CID 125853869
    .
  4. ^
    S2CID 17592657
    .
  5. ^
    S2CID 118629873
    .
  6. ^
    Bibcode:2002yCat.2237....0D
    .
  7. ^
    doi:10.1093/mnras/189.3.601
    .
  8. ^ "BK Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-12.
  9. S2CID 16098861
  10. doi:10.1086/140127
    .
  11. doi:10.1086/147587
    .
  12. doi:10.1051/0004-6361:20030530
    .
  13. S2CID 237503492
    .
  14. ISBN 978-986-7332-25-7
    .
  15. ^ English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Archived August 10, 2010, at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
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