HD 114533, also known as HR 4976, is a solitary star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 5.84, making it faintly visible to the naked eye. The system is located relatively far at a distance of roughly 2,100 light years based on Gaia DR3 parallax measurements but is drifting closer with a heliocentric radial velocity of −18 km/s. At its current distance, HD 114533A's brightness is diminished by 0.74 magnitudes due to interstellar dust.[14] It has an absolute magnitude of −2.0.[6]
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 13h 14m 17.3297s[1] |
| Declination | −78° 26′ 50.8362″[1] |
| Apparent magnitude (V) | 5.84±0.01[2] |
| Characteristics | |
| Spectral type | G2 Ib[3] |
| U−B color index | +0.72[4] |
| B−V color index | +1.07[4] |
| Astrometry | |
| Radial velocity (Rv) | −17.9±0.3[5] km/s |
| Proper motion (μ) | RA: −9.435[1] mas/yr Dec.: −4.222[1] mas/yr |
| Parallax (π) | 1.5528 ± 0.0359 mas[1] |
| Distance | 2,100 ± 50 ly (640 ± 10 pc) |
| Absolute magnitude (MV) | −2.0[6] |
| Details | |
| Mass | 3.78[7] M☉ |
| Radius | 77.3±4.0[8] R☉ |
| Luminosity | 2,383±110[9] L☉ |
| Surface gravity (log g) | 1.21[7] cgs |
| Temperature | 4,514+372 −274[10] K |
| Metallicity [Fe/H] | −0.04+0.01 −0.00[1] dex |
| Rotational velocity (v sin i) | 9.2±1[11] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an evolved supergiant with a stellar classification of G2 Ib.[3] It has also been given class of F8 Ib,[15] indicating a slightly hotter star. It has 3.78 times the mass of the Sun[7] but has expanded to 77.3 times its girth.[8] HD 114533 radiates over 2,000 times the bolometric luminosity[9] of the Sun from its enlarged photosphere at an effective temperature of 4,514 K,[10] giving it a yellowish-orange hue. The object has a near-solar metallicity[1] and spins modestly with a projected rotational velocity of 9.2 km/s.[11]
References
edit- ^ a b c d e f g Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ 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 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°. 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.
- ^ 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
- ^ a b 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
- ^ a b c Anders, F.; et al. (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. eISSN 1432-0746. ISSN 0004-6361.
- ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361.
- ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b Ammons, S. Mark; Robinson, Sarah E.; Strader, Jay; Laughlin, Gregory; Fischer, Debra; Wolf, Aaron (20 February 2006). "The N2K Consortium. IV. New Temperatures and Metallicities for More than 100,000 FGK Dwarfs". The Astrophysical Journal. 638 (2): 1004–1017. arXiv:astro-ph/0510237. Bibcode:2006ApJ...638.1004A. doi:10.1086/498490. eISSN 1538-4357. ISSN 0004-637X.
- ^ a b De Medeiros, J. R.; Udry, S.; Burki, G.; Mayor, M. (29 October 2002). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 395 (1): 97–98. Bibcode:2002A&A...395...97D. doi:10.1051/0004-6361:20021214. eISSN 1432-0746. ISSN 0004-6361.
- ^ 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.
- ^ "HD 114533". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved April 16, 2022.
- ^ Guarinos, J. (February 1995). "VizieR Online Data Catalog: Interstellar matter in the Galactic Disk (Guarinos J., 1992)". VizieR Online Data Catalog: 301V/86. Bibcode:1995yCat.5086....0G.
- ^ Malaroda, S. (August 1975). "Study of the F-type 1 MK spectral types". The Astronomical Journal. 80: 637. Bibcode:1975AJ.....80..637M. doi:10.1086/111786. ISSN 0004-6256.