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.
  | |
| 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 | |
| Database references | |
| SIMBAD | data |
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
edit- ^ 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. - ^ a b c 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.
- ^ a b c d 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.
- ^ a b 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.
- ^ 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.
- ^ a b c 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.
- ^ a b c 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.
- ^ a b c d e f g 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.
- ^ 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.
- ^ "106 Aqr -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-15.
- ^ 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.
- ^ 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.