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52 Sagittarii
Location of 52 Sagittarii (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Sagittarius
Right ascension 19h 36m 42.43288s [1]
Declination −24° 53′ 01.0288″ [1]
Apparent magnitude (V) 4.59 [2] + 9.2
Characteristics
Evolutionary stage main sequence [3]
Spectral type B8/9V [4] + K2–4V
U−B color index −0.15 [5]
B−V color index −0.06 [5]
Astrometry
Radial velocity (Rv)−19.00 [6] km/s
Proper motion (μ) RA: +68.30 [1]  mas/ yr
Dec.: −21.51 [1]  mas/ yr
Parallax (π)17.20 ± 0.23  mas [1]
Distance190 ± 3  ly
(58.1 ± 0.8  pc)
Absolute magnitude (MV)0.77 [2]
Details
52 Sgr A
Mass3.0±0.1 [7]  M☉
Radius2.1 [8]  R☉
Luminosity60.5+1.9
−1.8 [3]  L☉
Surface gravity (log g)4.19 [9]  cgs
Temperature10,592+74
−72 [3]  K
Metallicity [Fe/H]0.00 [10]  dex
Rotational velocity (v sin i)48 [3] km/s
Age57.3±11.7 [7]  Myr
Other designations
h2 Sgr, 52 Sgr, NSV 12191, CD−25°14184, GC 27089, HD 184707, HIP 96465, HR 7440, SAO 188337, CCDM J19367-2453AB, WDS J19367-2453AB, GSC 06893-02132 [11]
Database references
SIMBAD data

52 Sagittarii is a binary star [12] system in the southern constellation of Sagittarius. It has the Bayer designation h2 Sagittarii, while 52 Sagittarii is the Flamsteed designation. This system is visible to the naked eye as a faint, blue-white hued point of light with an apparent visual magnitude of 4.59. [2] It is located approximately 190 light years away based on parallax, [1] but is drifting closer with a radial velocity of −19 km/s. [6]

The primary component is a B-type main-sequence star with a stellar classification of B8/9V. [4] Garrison and Gray (1994) assigned it a class of kB8 hB9 HeA0 Va (Sr Fe II), [13] displaying the calcium K line of a B8 class star, the hydrogen lines of a B9 star, and the helium lines of an A0 star, along with overabundances of strontium and iron. It is around 57 [7] million years old with three [7] times the mass of the Sun and about 2.1 [8] times the Sun's radius. It is radiating 60.5 [3] times the luminosity of the Sun from its photosphere at an effective temperature of 10,592 K. [3] The star is spinning with a projected rotational velocity of 48 km/s. [3]

52 Sagittarii has one companion at an angular separation of 2.4 ″. This object is magnitude 9.2 with a spectral class in the K2V-K4V range, and is believed to be the source of X-ray emissions from the system. [14] [15]

References

  1. ^ a b c d e f 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. Vizier catalog entry
  2. ^ 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. Vizier catalog entry
  3. ^ a b c d e f g Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv: 1201.2052. Bibcode: 2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691. S2CID  55586789. Vizier catalog entry
  4. ^ a b Houk, Nancy; Smith-Moore, M. (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. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode: 2014JAVSO..42..443M. Vizier catalog entry
  6. ^ a b Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institution for Science. Bibcode: 1953GCRV..C......0W. LCCN  54001336.
  7. ^ a b c d Tetzlaff, N.; et al. (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. Vizier catalog entry
  8. ^ a b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002. Bibcode: 1999A&A...352..555A. Vizier catalog entry
  9. ^ David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv: 1501.03154. Bibcode: 2015ApJ...804..146D. doi: 10.1088/0004-637X/804/2/146. S2CID  33401607. Vizier catalog entry
  10. ^ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv: 1606.08814. Bibcode: 2012AstL...38..771G. doi: 10.1134/S1063773712120031. S2CID  118345778. Vizier catalog entry
  11. ^ "h02 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-27.
  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. ^ Garrison, R. F.; Gray, R. O. (1994). "The late B-type stars: Refined MK classification, confrontation with stromgren photometry, and the effects of rotation". The Astronomical Journal. 107: 1556. Bibcode: 1994AJ....107.1556G. doi: 10.1086/116967. Garrison has note: "Balmer shell cores?"
  14. ^ Hubrig, S.; et al. (2007). "Establishing the nature of companion candidates to X-ray-emitting late B-type stars". Monthly Notices of the Royal Astronomical Society. 381 (4): 1569. arXiv: 0708.0860. Bibcode: 2007MNRAS.381.1569H. doi: 10.1111/j.1365-2966.2007.12325.x. S2CID  15143368.
  15. ^ Mason, Brian D.; et al. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode: 2001AJ....122.3466M. doi: 10.1086/323920. Vizier catalog entry
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