Astronomy:106 Aquarii

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Short description: Star in the constellation Aquarius
106 Aquarii
Location of 106 Aquarii (circled)[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius[2]
Right ascension  23h 44m 12.07852s[3]
Declination −18° 16′ 36.9999″[3]
Apparent magnitude (V) +5.244[4]
Characteristics
Evolutionary stage main sequence[5]
Spectral type B9 V[6]
U−B color index −0.239[4]
B−V color index −0.086[4]
Astrometry
Radial velocity (Rv)+14.0[7] km/s
Proper motion (μ) RA: +27.23[8] mas/yr
Dec.: −2.94[8] mas/yr
Parallax (π)8.7588 ± 0.2859[3] mas
Distance370 ± 10 ly
(114 ± 4 pc)
Absolute magnitude (MV)−0.07[2]
Details
Mass3.0[9] M☉
Radius3.0[9] R☉
Luminosity146[9] L☉
Surface gravity (log g)3.95±0.07[9] cgs
Temperature11,505±142[9] K
Rotational velocity (v sin i)328±48[10] km/s
Other designations
i1 Aqr, 106 Aqr, BD−19°6500, FK5 1621, HD 222847, HIP 117089, HR 8998, SAO 165854[11]
Database references
SIMBADdata

106 Aquarii, abbreviated 106 Aqr, is a single[12] 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,[4] making it bright enough to be viewed from the suburbs according to the Bortle Dark-Sky Scale. An annual parallax shift of 8.61[8] 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,[6] indicating this is a B-type main sequence star. It is spinning rapidly with a projected rotational velocity of 328 km/s.[10] The star has three times the mass of the Sun and is radiating 146 times the Sun's luminosity from its photosphere at an effective temperature of 11,505 K.[9] 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.[13]

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, 3, Sky Publishing Corporation and the European Space Agency, p. 1351, ISBN 0-933346-82-4. 
  2. ↑ 2.0 2.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  3. ↑ 3.0 3.1 3.2 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  4. ↑ 4.0 4.1 4.2 4.3 Gutierrez-Moreno, Adelina et al. (1966), "A System of photometric standards", Publications of the Department of Astronomy University of Chile (Publicaciones Universidad de Chile, Department de Astronomy) 1: 1–17, Bibcode: 1966PDAUC...1....1G. 
  5. ↑ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. 
  6. ↑ 6.0 6.1 Houk, Nancy (1978), Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1988mcts.book.....H. 
  7. ↑ 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 (Astronomisches Rechen-Institut Heidelberg) 35 (35): 1, Bibcode: 1999VeARI..35....1W. 
  8. ↑ 8.0 8.1 8.2 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  10. ↑ 10.0 10.1 Huang, Wenjin et al. (2010), "A Stellar Rotation Census of B Stars: From Zams to Tams", The Astrophysical Journal 722 (1): 605–619, doi:10.1088/0004-637X/722/1/605, Bibcode: 2010ApJ...722..605H. 
  11. ↑ "106 Aqr -- Star", SIMBAD (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=106+Aquarii, retrieved 2012-07-15. 
  12. ↑ 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, doi:10.1111/j.1365-2966.2012.21317.x, Bibcode: 2012MNRAS.424.1925C. 
  13. ↑ 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, doi:10.1051/0004-6361:20010452, Bibcode: 2001A&A...372..152H. 



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