HD 76236

HD 76236, also designated as HR 3543 or rarely 11 G. Chamaeleontis,[12] is a solitary star[14] located in the southern circumpolar constellation Chamaeleon. It is faintly visible to the naked eye as an orange-hued star with an apparent magnitude of 5.77.[2] Based on parallax measurements from the Gaia satellite, the object is estimated to be 612 light years away.[1] Currently, it is receding with a heliocentric radial velocity of 7 km/s.[5] At its current distance, HD 76236's brightness is diminished by 0.39 magnitudes due to interstellar dust.[15] It has an absolute magnitude of −0.13.[6]

HD 76236
Location of HD 76236 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Chamaeleon
Right ascension 08h 45m 55.14862s[1]
Declination −79° 30′ 15.7456″[1]
Apparent magnitude (V) 5.77±0.01[2]
Characteristics
Spectral type K5 III[3]
U−B color index +1.96[4]
B−V color index +1.60[4]
Astrometry
Radial velocity (Rv)7±0.4[5] km/s
Proper motion (μ) RA: −27.042[1] mas/yr
Dec.: +81.026[1] mas/yr
Parallax (π)5.3327 ± 0.049 mas[1]
Distance612 ± 6 ly
(188 ± 2 pc)
Absolute magnitude (MV)−0.13[6]
Details
Mass1.78±0.09[7] M☉
Radius53.1±2.7[8] R☉
Luminosity950+160
−60[1] L☉
Surface gravity (log g)1.18[9] cgs
Temperature3,989±122[10] K
Metallicity [Fe/H]+0.27[9] dex
Rotational velocity (v sin i)3±1.1[11] km/s
Other designations
11 G. Chamaeleontis[12], CPD−79°352, GC 12194, HD 76236, HIP 43012, HR 3543, SAO 256552[13]
Database references
SIMBADdata

This is an evolved red giant with a stellar classification K5 III.[3] It has 1.78 times the mass of the Sun[7] and an enlarged radius of 53.1 R☉.[8] It radiates 950 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 3,989 K.[10] HD 76236 has an iron abundance nearly twice of the Sun's,[9] making it metal enriched. It spins modestly with a projected rotational velocity of 3 km/s. An infrared excess has been detected around HD 76236, indicating that the star may have a circumstellar disk.[16][17]

References
  1. 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.
  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. (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. eISSN 1562-6873. 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
  7. Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (21 December 2021). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
  8. 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.
  9. 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.
  10. Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
  11. 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". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361.
  12. 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.
  13. "HD 76236". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved April 15, 2022.
  14. Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.
  15. Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711.
  16. Zuckerman, B.; Kim, Sungsoo S.; Liu, T. (June 1995). "Luminosity Class III Stars with Excess Far-Infrared Emission". The Astrophysical Journal. 446: L79. Bibcode:1995ApJ...446L..79Z. doi:10.1086/187935. eISSN 1538-4357. ISSN 0004-637X.
  17. Plets, H.; et al. (July 1997), "Giants with infrared excess.", Astronomy and Astrophysics, 323: 513–523, Bibcode:1997A&A...323..513P, ISSN 0004-6361
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