Sigma Boötis

Source: Wikipedia, the free encyclopedia.
Not to be confused with S Boötis.
σ Boötis
Location of σ Boötes (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation
Boötes
Right ascension 14h 34m 40.81718s[1]
Declination +29° 44′ 42.4637″[1]
Apparent magnitude (V) 4.46[2]
Characteristics
Spectral type F4VkF2mF1[3]
U−B color index −0.084[2]
B−V color index +0.366[2]
Variable type Suspected[4]
Distance
51.1 ± 0.2 ly
(15.66 ± 0.06 pc)
Absolute magnitude (MV)3.52[6]
Details
Gyr
HR 5447, SAO 83416, CCDM 14347+2945[14]
Database references
SIMBADdata

Sigma Boötis, its name

″ yr−1.[17]

The

zero age main sequence star, which may indicate it is near the end of its main sequence lifetime.[13]

Sigma Boötis is a solar-type star but is larger and more massive than the Sun. It has an estimated age of around two

Gauss.[19] The star is radiating 3.5[9] times the luminosity of the Sun from its photosphere at an effective temperature of 6,594 K.[9] It appears to be a source for X-ray emission.[20]

Infrared surveys with the Spitzer and Herschel space telescopes failed to detect an infrared excess around this star at wavelengths up to 160 μm. However, the HOSTS Survey with the Large Binocular Telescope reported a detection of an excess in the far infrared, indicating the presence of exozodiacal dust near the habitable zone of the star.[21]

Nomenclature

Sigma Boötis is known by several different names, including σ Boo, 28 Boötis, BD+30°2536, GC 19659, GJ 557, HD 128167, HIP 71284, HR 5447, SAO 83416, and CCDM 14347+2945.[14]

Chinese name

In

Chinese name for σ Boötis itself is 梗河二 (Gěng Hé èr, English: the Second Star of Celestial Lance.)[23]

References

  1. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  2. ^
    hdl:2152/34447
    .
  3. ^
    doi:10.1086/319956
    .
  4. S2CID 125853869
    .
  5. S2CID 51814894
    .
  6. ^
    S2CID 56332289
    , A67.
  7. S2CID 33401607
    .
  8. ^
    S2CID 125765376
    , 111.
  9. ^
    S2CID 18993744
    .. See Table 10.
  10. S2CID 118786105
    .
  11. ^
    S2CID 43455849
    .
  12. ^
    S2CID 16751327
    .
  13. ^
    S2CID 693296
    .
  14. ^ a b "sig Boo", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2021-01-26.
  15. S2CID 14878976
    .
  16. S2CID 119237891
    .
  17. S2CID 2603568
    .
  18. Bibcode:2009ssc..book.....G
    .
  19. doi:10.1093/mnras/staa1107
    .
  20. S2CID 119267456
    .
  21. S2CID 52227431
    , 194.
  22. ISBN 978-986-7332-25-7
    .
  23. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 29 日

External links

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