HD 73468 (HR 3417) is a solitary star in the southern circumpolar constellation Volans. It is faintly visible to the naked eye with an apparent magnitude of 6.10,[2] and is estimated to be 420 light years away based on parallax measurements.[1] However, it is approaching the Solar System with a heliocentric radial velocity of −26.5 km/s.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Volans |
| Right ascension | 08h 32m 41.77s[1] |
| Declination | −73° 21′ 24.44″[1] |
| Apparent magnitude (V) | 6.10±0.01[2] |
| Characteristics | |
| Evolutionary stage | horizontal branch[3] |
| Spectral type | G8 III[4] |
| U−B color index | +0.65[5] |
| B−V color index | +0.95[5] |
| Astrometry | |
| Radial velocity (Rv) | −26.5±0.4[6] km/s |
| Proper motion (μ) | RA: −54.973 mas/yr[1] Dec.: +73.054 mas/yr[1] |
| Parallax (π) | 7.7564 ± 0.0247 mas[1] |
| Distance | 420 ± 1 ly (128.9 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.69[7] |
| Details[8] | |
| Mass | 2.11±0.06 M☉ |
| Radius | 10.24±0.16 R☉ |
| Luminosity | 59±1 L☉ |
| Surface gravity (log g) | 2.73±0.06 cgs |
| Temperature | 5,001±32 K |
| Metallicity [Fe/H] | −0.09±0.03 dex |
| Rotational velocity (v sin i) | 2.1±1.3[9] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 73468 is a star with a classification of G8 III,[4] indicating that it is a giant star. It is currently on the horizontal branch[3] — generating energy via helium fusion in its core. HD 73468 has twice the mass of the Sun but has expanded to 10.24 times the radius of the Sun.[8] It shines with a luminosity of 59 L☉ from its swollen photosphere at an effective temperature of 5,001 K,[8] giving a yellow hue. HD 73468 is metal deficient with an iron abundance 81% that of the Sun[8] and spins with a projected rotational velocity of about 2.1 km/s.[9]
See also
editReferences
edit- ^ a b c d e 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.
- ^ a b 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.
- ^ a b Laney, C. D.; Joner, M. D.; Pietrzyński, G. (11 November 2011). "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars". Monthly Notices of the Royal Astronomical Society. 419 (2): 1637–1641. arXiv:1109.4800. Bibcode:2012MNRAS.419.1637L. doi:10.1111/j.1365-2966.2011.19826.x. ISSN 0035-8711.
- ^ a b 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.
- ^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
- ^ a b 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.
- ^ 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.
- ^ a b c d Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (January 2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy & Astrophysics. 657: A87. arXiv:2201.01528. Bibcode:2022A&A...657A..87O. doi:10.1051/0004-6361/202040078. ISSN 0004-6361.
- ^ a b 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.
- ^ "HR 3417". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 21, 2022.
- ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
