HD 88809

This article will address the issue of HD 88809, which has gained great relevance in recent years. HD 88809 has become a point of interest for various sectors of society, from experts in the field to the general public. Over time, HD 88809 has demonstrated its impact in different areas, generating debates, research and significant changes. That is why it is necessary to deepen its analysis, in order to understand its importance and its implications at a global level. Furthermore, it is important to examine current trends related to HD 88809, as well as possible future scenarios that could arise around this topic.

HD 88809
Observation data
Epoch J2000      Equinox J2000
Constellation Antlia
Right ascension 10h 13m 45.9269s[1]
Declination −40° 20′ 45.6832″[1]
Apparent magnitude (V) 5.893±0.009[2]
Characteristics
Spectral type K1 III[3]
U−B color index +1.25[4]
B−V color index +1.21[4]
Astrometry
Radial velocity (Rv)19.96±0.76[1] km/s
Proper motion (μ) RA: −79.460[1] mas/yr
Dec.: +2.511[1] mas/yr
Parallax (π)7.2269±0.0909 mas[1]
Distance451 ± 6 ly
(138 ± 2 pc)
Absolute magnitude (MV)+0.19
Position (relative to HD 88809A)[5]
ComponentHD 88809B
Epoch of observationJ2000.0
Angular distance4.9″
Position angle105°
Projected separation676.2 AU
Details[6]
Mass1.29+1.20
−0.4 M☉
Radius17.07[7] R☉
Luminosity117±8 L☉
Temperature4,410±110 K
Metallicity −0.2 dex
Rotational velocity (v sin i)<1.3[8] km/s
Age4.9[9] Gyr
Other designations
55 G. Antliae, CD−39°6222, HD 88809, HIP 50103, HR 4015, SAO 22187
Database references
SIMBADdata

HD 88809 is a star located in the southern constellation Antlia. With an apparent magnitude of 5.89[2] it is barely visible to the naked eye under ideal conditions. The star is located at a distance of around 451 light years[1] but is drifting away at a heliocentric radial velocity of almost 20 km/s.[1]

HD 88809 has a classification of K1 III[3] which indicates that it is an evolved early K-type giant star that has exhausted hydrogen at its core and left the main sequence. It has an angular diameter of 1.15 mas,[10] which yields a diameter of 17.07[7] times that of the Sun at its estimated distance. At present HD 88809 has 129%[6] the mass of the Sun and shines with a luminosity approximately 117[6] times that of the Sun and has a surface temperature of 4,410 K,[6] which gives it an orange glow of a K-type star. HD 88809 has a faint 13th magnitude companion located approximately 4.9″ away.[5]

References

  1. ^ a b c d e f g h 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.
  2. ^ a b 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. ^ a b Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. Bibcode:1982mcts.book.....H.
  4. ^ a b Mermilliod, J. -C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data: 0. Bibcode:1986EgUBV........0M.
  5. ^ a b 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. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.
  6. ^ a b c d Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics. 633: A34. arXiv:1910.12732. Bibcode:2020A&A...633A..34C. doi:10.1051/0004-6361/201936360. ISSN 0004-6361.
  7. ^ a b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
  8. ^ 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: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
  9. ^ "Digital Demo Room - Stellar Structure and Evolution Simulator". rainman.astro.illinois.edu.
  10. ^ Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (3 March 2017). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal. 153 (3): 136. arXiv:1609.04389. Bibcode:2017AJ....153..136S. doi:10.3847/1538-3881/aa5df3. ISSN 0004-6256.