Astronomy:HD 131551

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Short description: Star in the constellation Apus
HD 131551
Observation data
Equinox J2000.0]] (ICRS)
Constellation Apus[1]
Right ascension  14h 59m 55.7597s[2]
Declination −75° 01′ 57.6124″[2]
Apparent magnitude (V) 6.19±0.01[3]
Characteristics
Evolutionary stage main sequence[4][2]
Spectral type B9 V[5]
U−B color index −0.19[6]
B−V color index −0.04[6]
Astrometry
Radial velocity (Rv)−7.6±1.7[7] km/s
Proper motion (μ) RA: −5.659[2] mas/yr
Dec.: −20.787[2] mas/yr
Parallax (π)6.198 ± 0.04[2] mas
Distance526 ± 3 ly
(161 ± 1 pc)
Absolute magnitude (MV)+0.3[8]
Details
Mass2.84±0.06[4] M☉
Radius3.19[9] R☉
Luminosity100[10] L☉
Surface gravity (log g)3.86[9] cgs
Temperature10,651[10] K
Metallicity [Fe/H]0.00[11] dex
Rotational velocity (v sin i)141[12] km/s
Age254[11] Myr
Other designations
CD−74°947, CPD−74°1281, GC 20110, HD 131551, HIP 73394, HR 5555, SAO 257219, WDS J14599-7502A
Database references
SIMBADdata

HD 131551 (HR 5555) is a solitary star in the southern constellation Apus. It has an apparent magnitude of 6.19,[3] 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.[7]

HD 131551 has a stellar classification of B9 V, indicating that it is an ordinary B-type main-sequence star.[5] At present it has 2.84 times the mass of the Sun[4] and a radius of 3.19 R☉.[9] It shines at 100 times the luminosity of the Sun[10] from its photosphere at an effective temperature of 10,651 K,[10] giving it a blue-white hue. This object is 254 million years old[11] – having completed 70.1%[4] of its main sequence lifetime – and is spinning rapidly with a projected rotational velocity of 141 km/s.[12] HD 131551 has a similar metallicity compared to the Sun.[11]

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

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  4. ↑ 4.0 4.1 4.2 4.3 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. Bibcode: 2012A&A...537A.120Z. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ 6.0 6.1 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. doi:10.1007/BF00659414. ISSN 0004-640X. Bibcode: 1993Ap&SS.203...53H. 
  7. ↑ 7.0 7.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  8. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  9. ↑ 9.0 9.1 9.2 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  10. ↑ 10.0 10.1 10.2 10.3 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. doi:10.1093/mnras/stx1433. Bibcode: 2017MNRAS.471..770M. 
  11. ↑ 11.0 11.1 11.2 11.3 Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. ISSN 0320-0108. Bibcode: 2012AstL...38..771G. 
  12. ↑ 12.0 12.1 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. 
  13. ↑ 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. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M. 



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