106 Aquarii

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106 Aquarii
Aquarius constellation map.svg
Red circle.svg
Location of 106 Aquarii (circled) [1]
Observation data
Epoch J2000.0 (ICRS)       Equinox J2000.0 (ICRS)
Constellation Aquarius
Right ascension 23h 44m 12.07852s [2]
Declination −18° 16′ 36.9999″ [2]
Apparent magnitude  (V)+5.244 [3]
Characteristics
Spectral type B9 V [4]
U−B color index −0.239 [3]
B−V color index −0.086 [3]
Astrometry
Radial velocity (Rv)+14.0 [5] km/s
Proper motion (μ)RA: +27.23 [6] mas/yr
Dec.: −2.94 [6] mas/yr
Parallax (π)8.7588±0.2859  mas [2]
Distance 370 ± 10  ly
(114 ± 4  pc)
Absolute magnitude  (MV)−0.07 [7]
Details
Mass 3.0 [8]   M☉
Radius 2.7–3.2 [9]   R☉
Luminosity 151.88 [7]   L☉
Surface gravity (log g)3.791±0.011 [8]   cgs
Temperature 11,555±50 [8]   K
Rotational velocity (v sin i)328±48 [8]  km/s
Other designations
i1 Aqr, 106 Aqr, BD−19°6500, FK5 1621, HD 222847, HIP 117089, HR 8998, SAO 165854 [10]
Database references
SIMBAD data

106 Aquarii, abbreviated 106 Aqr, is a single [11] star in the equatorial constellation of Aquarius. 106 Aquarii is the Flamsteed designation, and it also bears the Bayer designation i1 Aquarii. It has an apparent visual magnitude of +5.2, [3] making it bright enough to be viewed from the suburbs according to the Bortle Dark-Sky Scale. An annual parallax shift of 8.61 [6]   milliarcseconds yields an estimated distance of around 380 light-years (120 parsecs ) from Earth.

The spectrum of this star fits a stellar classification of B9 V, [4] indicating this is a B-type main sequence star. It is spinning rapidly with a projected rotational velocity of 328 km/s. [8] The star has 3 [8] times the mass of the Sun and is radiating 152 [7] times the Sun's luminosity from its photosphere at an effective temperature of 11,555 K. [8] X-ray emission with a luminosity of 6.0×1029  erg s−1 has been detected from this star. This is unusual since a B-type star normally does not have any significant X-ray emission. Instead, it may have an undetected lower mass companion. [12]

References

  1. ↑ Of the grouping of four stars within the circle, 106 Aquarii is the second from the left per:
    Sinnott, Roger W.; et al. (1997), Millennium Star Atlas, vol. 3, Sky Publishing Corporation and the European Space Agency, p. 1351, ISBN   0-933346-82-4.
  2. 1 2 3 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 .
  3. 1 2 3 4 Gutierrez-Moreno, Adelina; et al. (1966), "A System of photometric standards", Publications of the Department of Astronomy University of Chile, 1, Publicaciones Universidad de Chile, Department de Astronomy: 1–17, Bibcode:1966PDAUC...1....1G.
  4. 1 2 Houk, Nancy (1978), Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
  5. ↑ Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W.
  6. 1 2 3 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752 , Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID   18759600.
  7. 1 2 3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971 , Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID   119257644.
  8. 1 2 3 4 5 6 7 Huang, Wenjin; et al. (2010), "A Stellar Rotation Census of B Stars: From Zams to Tams", The Astrophysical Journal, 722 (1): 605–619, arXiv: 1008.1761 , Bibcode:2010ApJ...722..605H, doi:10.1088/0004-637X/722/1/605, S2CID   118532653.
  9. ↑ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv: astro-ph/0012289 , Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID   425754.
  10. ↑ "106 Aqr -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg , retrieved 2012-07-15.
  11. ↑ Chini, R.; et al. (2012), "A spectroscopic survey on the multiplicity of high-mass stars", Monthly Notices of the Royal Astronomical Society, 424 (3): 1925–1929, arXiv: 1205.5238 , Bibcode:2012MNRAS.424.1925C, doi: 10.1111/j.1365-2966.2012.21317.x , S2CID   119120749.
  12. ↑ Hubrig, S.; et al. (June 2001), "Search for low-mass PMS companions around X-ray selected late B stars", Astronomy and Astrophysics, 372: 152–164, arXiv: astro-ph/0103201 , Bibcode:2001A&A...372..152H, doi:10.1051/0004-6361:20010452, S2CID   17507782.
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