Astronomy:HD 114533

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Short description: Star in the constellation Chamaeleon
HD 114533
Chamaeleon constellation map.svg
Red circle.svg
Location of HD 114533 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
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[1] mas
Distance2,100 ± 50 ly
(640 ± 10 pc)
Absolute magnitude (MV)−2.0[6]
Details
Mass3.78[7] M☉
Radius77.3±4.0[8] R☉
Luminosity2,383±110[9] L☉
Surface gravity (log g)1.21[7] cgs
Temperature4,514+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
CPD−77°890, FK5 3054, GC 17886, HD 114533, HIP 64587, HR 4976, SAO 257019[12]
Database references
SIMBADdata

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.[13] It has an absolute magnitude of −2.0.[6]

This is an evolved supergiant with a stellar classification of G2 Ib.[3] It has also been given class of F8 Ib,[14] 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

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 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. ↑ 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°. Bibcode: 1975mcts.book.....H. 
  4. ↑ 4.0 4.1 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. 
  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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  6. ↑ 6.0 6.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 7.2 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. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  8. ↑ 8.0 8.1 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. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  9. ↑ 9.0 9.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  10. ↑ 10.0 10.1 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. doi:10.1086/498490. ISSN 0004-637X. Bibcode: 2006ApJ...638.1004A. 
  11. ↑ 11.0 11.1 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. doi:10.1051/0004-6361:20021214. ISSN 0004-6361. Bibcode: 2002A&A...395...97D. 
  12. ↑ "HD 114533". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+114533. 
  13. ↑ 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. 
  14. ↑ Malaroda, S. (August 1975). "Study of the F-type 1 MK spectral types.". The Astronomical Journal 80: 637. doi:10.1086/111786. ISSN 0004-6256. Bibcode: 1975AJ.....80..637M. 
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