Astronomy:HD 131551
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| Distance | 526 ± 3 ly (161 ± 1 pc) |
| Absolute magnitude (MV) | +0.3[6] |
| Details | |
| Mass | 2.84±0.06[7] M☉ |
| Radius | 3.19[8] R☉ |
| Luminosity | 100[9] L☉ |
| Surface gravity (log g) | 3.86[8] cgs |
| Temperature | 10,651[9] K |
| Metallicity [Fe/H] | 0.00[10] dex |
| Rotational velocity (v sin i) | 141[11] km/s |
| Age | 254[10] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 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.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 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.
- ↑ 5.0 5.1 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.
- ↑ 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.
- ↑ 7.0 7.1 7.2 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.
- ↑ 8.0 8.1 8.2 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.
- ↑ 9.0 9.1 9.2 9.3 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.
- ↑ 10.0 10.1 10.2 10.3 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.
- ↑ 11.0 11.1 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.
- ↑ 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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