Astronomy:HD 76236

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Short description: Star in the constellation Chamaeleon
HD 76236
Chamaeleon constellation map.svg
Red circle.svg
Location of HD 76236 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
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[1] mas
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
CPD−79°352, GC 12194, HD 76236, HIP 43012, HR 3543, SAO 256552[12]
Database references
SIMBADdata

HD 76236, also designated as HR 3543 or rarely 11 G. Chamaeleontis,[13] 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]

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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 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. ↑ 2.0 2.1 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_ƒ0.. 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. ↑ 5.0 5.1 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 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (21 December 2021). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  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 9.2 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. 
  10. ↑ 10.0 10.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  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. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  12. ↑ "HD 76236". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+76236. 
  13. ↑ 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. 
  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. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
  16. ↑ Zuckerman, B.; Kim, Sungsoo S.; Liu, T. (June 1995). "Luminosity Class III Stars with Excess Far-Infrared Emission". The Astrophysical Journal 446: L79. doi:10.1086/187935. ISSN 0004-637X. Bibcode: 1995ApJ...446L..79Z. 
  17. ↑ Plets, H. et al. (July 1997), "Giants with infrared excess.", Astronomy and Astrophysics 323: 513–523, ISSN 0004-6361, Bibcode: 1997A&A...323..513P 



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