15 Aquarii

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15 Aquarii
Observation data
Epoch J2000       Equinox J2000
Constellation Aquarius
Right ascension 21h 18m 11.07309s [1]
Declination −04° 31′ 10.1276″ [1]
Apparent magnitude  (V)5.83 [2]
Characteristics
Spectral type B7 III [3] or B5 V [4]
B−V color index −0.130±0.005 [2]
Astrometry
Radial velocity (Rv)−9.0±1.0 [5] km/s
Proper motion (μ)RA: +12.11 [6] mas/yr
Dec.: +12.94 [6] mas/yr
Parallax (π)4.5632±0.1345  mas [1]
Distance 710 ± 20  ly
(219 ± 6  pc)
Absolute magnitude  (MV)−1.62 [2]
Details
Mass 5.7±0.2 [7]   M☉
Radius 3.4 [8]   R☉
Luminosity 821.67 [2]   L☉
Surface gravity (log g)3.84 [9]   cgs
Temperature 14,318 [9]   K
Rotational velocity (v sin i)20 [10]  km/s
Age 65.2±25.1 [7]   Myr
Other designations
15 Aqr, BD−05°5512, HD 202753, HIP 105164, HR 8141, SAO 145278 [11]
Database references
SIMBAD data

15 Aquarii, abbreviated 15 Aqr, is a single, [12] blue-white star in the zodiac constellation of Aquarius. 15 Aquarii is the Flamsteed designation. It is a dim star that is just visible to the naked eye under good viewing conditions, having an apparent visual magnitude of 5.83. [2] Based upon an annual parallax shift of 4.6  mas , [1] it is located around 710  light years away. At that distance, the visual magnitude is diminished by an extinction of 0.18 due to interstellar dust. [13] It is moving closer to the Earth with a heliocentric radial velocity of −9 km/s. [5] Relative to its neighbors, 15 Aqr has a peculiar velocity of 28.7+2.9
−3.1 km/s and may (62% chance) be a runaway star. [7]

Hube (1970) found a stellar classification of B7 III [3] for this star, which would suggest it is a B-type giant star. However, the Bright Star Catalogue (1964) listed it as a B-type main-sequence star with a class of B5 V, [4] and multiple sources use this instead. [7] [10] [8] [9] The star is roughly 65 [7]  million years old with a projected rotational velocity of 20 km/s. [10] It has an estimated 5.7 [7] times the mass of the Sun and about 3.4 [8] times the Sun's radius. 15 Aquarii is radiating 822 [2] times the Sun's luminosity from its photosphere at an effective temperature of 14,318 K. [9]

References

  1. 1 2 3 4 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 .
  2. 1 2 3 4 5 6 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.
  3. 1 2 Hube, Douglas P. (1970), "The radial velocities of 335 late B-type stars", Memoirs of the Royal Astronomical Society, 72: 233, Bibcode:1970MmRAS..72..233H.
  4. 1 2 Hoffleit, Dorrit (1964), Catalogue of Bright Stars (3rd revised ed.), New Haven, Conn.: Yale University Observatory, Bibcode:1964cbs..book.....H.
  5. 1 2 Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv: 1606.08053 , Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID   119231169.
  6. 1 2 van Leeuwen, F. (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 4 5 6 Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv: 1007.4883 , Bibcode:2011MNRAS.410..190T, doi: 10.1111/j.1365-2966.2010.17434.x , S2CID   118629873.
  8. 1 2 3 Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv: astro-ph/0012289 , Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID   425754.
  9. 1 2 3 4 Takeda, Yoichi; et al. (October 2010), "Oxygen and Neon Abundances of B-Type Stars in Comparison with the Sun", Publications of the Astronomical Society of Japan, 62 (5): 1239–1248, arXiv: 1008.1220 , Bibcode:2010PASJ...62.1239T, doi:10.1093/pasj/62.5.1239.
  10. 1 2 3 Strom, Stephen E.; et al. (2005), "B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch?", The Astronomical Journal, 129 (2): 809–828, arXiv: astro-ph/0410337 , Bibcode:2005AJ....129..809S, doi:10.1086/426748, S2CID   15059129.
  11. ↑ "15 Aqr". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved October 22, 2018.
  12. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2): 869–879, arXiv: 0806.2878 , Bibcode:2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x , S2CID   14878976.
  13. ↑ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv: 1606.09028 , Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID   119108982.
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