Astronomy:HD 131425
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Short description: Star in the constellation Apus
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Apus |
| Right ascension | 15h 00m 11.3018s[1] |
| Declination | −77° 09′ 37.9863″[1] |
| Apparent magnitude (V) | 5.92±0.01[2] |
| Characteristics | |
| Spectral type | G8 II[3] |
| U−B color index | +0.81[4] |
| B−V color index | +1.05[4] |
| Astrometry | |
| Radial velocity (Rv) | 1.9±0.4[5] km/s |
| Proper motion (μ) | RA: −13.997[1] mas/yr Dec.: −10.915[1] mas/yr |
| Parallax (π) | 3.5348 ± 0.0272[1] mas |
| Distance | 923 ± 7 ly (283 ± 2 pc) |
| Absolute magnitude (MV) | −0.91[6] |
| Details | |
| Mass | 3.13±0.58[7] M☉ |
| Radius | 22.69[8] R☉ |
| Luminosity | 295[6] L☉ |
| Temperature | 4,750[7] K |
| Metallicity [Fe/H] | −0.3[9] dex |
| Rotational velocity (v sin i) | 9.1±2[10] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 131425 (HR 5547) is a solitary star in the southern circumpolar constellation Apus. It has an apparent magnitude of 5.92,[2] allowing it to be seen with the naked eye under ideal conditions. Located 923 light years away,[1] it is receding with a heliocentric radial velocity of 1.9 km/s.[5]
HD 131425 has a stellar classification of G8 II, indicating that it is an ageing G-type bright giant.[3] At present it has 3.13 times the mass of the Sun[7] and an enlarged diameter of 22.69 R☉.[8] It shines at 295 times the luminosity of the Sun[6] from its photosphere at an effective temperature of 4,750 K,[7] giving it an orange yellow glow. HD 131425 has an iron abundance only half of the Sun[9] and spins with a projected rotational velocity of 9.1 km/s,[10] unusually high for giants.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1 January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J.
- ↑ 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.
- ↑ 6.0 6.1 6.2 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 7.3 Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (April 2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten 331 (4): 349–360. doi:10.1002/asna.200911355. ISSN 0004-6337. Bibcode: 2010AN....331..349H.
- ↑ 8.0 8.1 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.
- ↑ 9.0 9.1 Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A. et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A.
- ↑ 10.0 10.1 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D.
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