Astronomy:HD 104555

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Short description: High proper motion star; K-type giant + F-type
HD 104555
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Octans
Right ascension  12h 02m 20.23931s[1]
Declination −85° 37′ 54.3264″[1]
Apparent magnitude (V) 6.02±0.01[2]
Characteristics
Evolutionary stage horizontal branch[3]
Spectral type K3 III[4]
U−B color index +1.54[5]
B−V color index +1.29[5]
Astrometry
Radial velocity (Rv)17.1±0.4[6] km/s
Proper motion (μ) RA: −57.259[1] mas/yr
Dec.: +1.452[1] mas/yr
Parallax (π)9.7144 ± 0.0241[1] mas
Distance335.7 ± 0.8 ly
(102.9 ± 0.3 pc)
Absolute magnitude (MV)+0.78[7]
Details
Mass2.18+0.02−0.01[8] M☉
Radius9.82+1.95−0.92[8] R☉
Luminosity59.8[9] L☉
Temperature4,497±122[10] K
Metallicity [Fe/H]−0.06+0.11−0.08[8] dex
Rotational velocity (v sin i)<1[11] km/s
Age955+68−42[8] Myr
Other designations
CPD−84°371, FK5 3983, GC 16449, HD 104555, HIP 58697, HR 4595, SAO 258632, WDS J12023-8538A[12]
Database references
SIMBADdata

HD 104555, also known as HR 4595, is a star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 6.02,[2] allowing it to be faintly visible to the naked eye. Based on parallax measurements from Gaia Data Release 3, it is estimated to be 336 light years distant.[1] It appears to be receding from the Solar System, having a heliocentric radial velocity of 17.1 km/s.[6]

This is an evolved, orange hued giant star with a stellar classification of K3 III.[4] It is currently on the horizontal branch,[3] generating energy via helium fusion at its core. It has twice the mass of the Sun but at 955 million years old, it has expanded to 9.82 times its girth.[8] It radiates 60 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 4,497 K.[10] HD 10455 has an iron abundance 12% below solar levels, making it slightly metal deficient.[8] Like most giants, it spins slowly, having a projected rotational velocity lower than 1 km/s.[11]

HIP 58713 is an 8th magnitude co-moving star located 24.8″ away along a position angle of 146°.[13] It is a main sequence star with a spectral class of F8, and is estimated to be around the same distance as HD 104555.[14]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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 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. doi:10.1111/j.1365-2966.2011.19826.x. ISSN 0035-8711. Bibcode: 2012MNRAS.419.1637L. 
  4. ↑ 4.0 4.1 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. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ 6.0 6.1 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. 
  7. ↑ 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. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 Bochanski, John J.; Faherty, Jacqueline K.; Gagné, Jonathan; Nelson, Olivia; Coker, Kristina; Smithka, Iliya; Desir, Deion; Vasquez, Chelsea (12 March 2018). "Fundamental Properties of Co-moving Stars Observed byGaia". The Astronomical Journal 155 (4): 149. doi:10.3847/1538-3881/aaaebe. Bibcode: 2018AJ....155..149B. 
  9. ↑ 9.0 9.1 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society 471 (1): 770–791. doi:10.1093/mnras/stx1433. ISSN 0035-8711. Bibcode: 2017MNRAS.471..770M. 
  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. ↑ 11.0 11.1 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 104555". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+104555. 
  13. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M. 
  14. ↑ 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.
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