HD 131425

HD 131425

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Apus
Right ascension	15^h 00^m 11.3018^s[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 mas[1]
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
19 G. Apodis, CPD−76°931, GC 20104, HD 131425, HIP 73415, HR 5547, SAO 257218
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. 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. 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. 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 119257644.
7. 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. arXiv:1003.2335. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. ISSN 0004-6337. S2CID 111387483.
8. 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.
9. Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; de Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
10. 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. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.