HD 131551

HD 131551 (HR 5555) is a solitary star in the southern constellation Apus. It has an apparent magnitude of 6.19,[2] allowing it to be faintly seen with the naked eye under ideal conditions. Located 526 light years away, the object is approaching the Sun with a heliocentric radial velocity of 7.6 km/s.[5]

HD 131551
Observation data
Epoch J2000      Equinox J2000
Constellation Apus
Right ascension 14h 59m 55.7597s[1]
Declination −75° 01′ 57.6124″[1]
Apparent magnitude (V) 6.19±0.01[2]
Characteristics
Spectral type B9 V[3]
U−B color index −0.19[4]
B−V color index −0.04[4]
Astrometry
Radial velocity (Rv)−7.6±1.7[5] km/s
Proper motion (μ) RA: −5.659[1] mas/yr
Dec.: −20.787[1] mas/yr
Parallax (π)6.198 ± 0.04 mas[1]
Distance526 ± 3 ly
(161 ± 1 pc)
Absolute magnitude (MV)+0.3[6]
Details
Mass2.84±0.06[7] M☉
Radius3.19[8] R☉
Luminosity100[9] L☉
Surface gravity (log g)3.86[8] cgs
Temperature10,651[9] K
Metallicity [Fe/H]0.00[10] dex
Rotational velocity (v sin i)141[11] km/s
Age254[10] Myr
Other designations
20 G. Apodis, CD−74° 947, CPD−74° 1281, GC 20110, HD 131551, HIP 73394, HR 5555, SAO 257219, WDS J14599-7502A
Database references
SIMBADdata

HD 131551 has a stellar classification of B9 V, indicating that it is an ordinary B-type main-sequence star.[3] At present it has 2.84 times the mass of the Sun[7] and a radius of 3.19 R☉.[8] It shines at 100 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 10,651 K,[9] giving it a blue-white hue. This object is 254 million years old[10] – having completed 70.1%[7] of its main sequence lifetime – and is spinning rapidly with a projected rotational velocity of 141 km/s.[11] HD 131551 has a similar metallicity compared to the Sun.[10]

There is a 13th magnitude companion star at an angular separation of 34.5″ along a position angle of 123° (as of 2010).[12]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
  4. Hamdy, M. A.; Abo Elazm, M. S.; Saad, S. M. (1993). "A catalogue of spectral classification and photometric data of B-type stars". Astrophysics and Space Science. 203 (1): 53–107. Bibcode:1993Ap&SS.203...53H. doi:10.1007/BF00659414. ISSN 0004-640X. S2CID 122459090.
  5. Gontcharov, G. A. (November 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. ISSN 1063-7737. S2CID 119231169.
  6. Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 255204555.
  7. Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. S2CID 55586789.
  8. Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
  9. McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433.
  10. Gontcharov, G. A. (December 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. ISSN 0320-0108. S2CID 255201789.
  11. Levato, H.; Grosso, M. (June 2004). "New Projected Rotational Velocities of All Southern B-type Stars of the Bright Star Catalogue". Astronomical Society of the Pacific. 215: 51. Bibcode:2004IAUS..215...51L.
  12. Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.
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