HD 26755

HD 26755
Location of HD 26755 on the map (circled)
Observation data
Epoch J2000.0      Equinox ICRS
Constellation Camelopardalis
Right ascension 04h 17m 08.09353s
Declination +57° 51′ 37.1513″
Apparent magnitude (V) 5.72±0.01
Characteristics
Evolutionary stage red clump
Spectral type K1 III
B−V color index +1.09
Astrometry
Radial velocity (Rv)−38.2±1.6 km/s
Proper motion (μ) RA: +29.108 mas/yr
Dec.: −25.942 mas/yr
Parallax (π)12.0207±0.1939 mas
Distance271 ± 4 ly
(83 ± 1 pc)
Absolute magnitude (MV)+1.21
Orbit
PrimaryA
SecondaryB
Period (P)1,658.7±2.9 d
Eccentricity (e)0.309±0.005
Periastron epoch (T)2,453,848±5 JD
Argument of periastron (ω)
(secondary)		31.2±1.2°
Semi-amplitude (K1)
(primary)		6.10±0.04 km/s
Details
Mass1.68 M☉
Radius9.44±0.47 R☉
Luminosity42.5±1.3 L☉
Surface gravity (log g)2.58±0.11 cgs
Temperature4,717±92 K
Metallicity [Fe/H]+0.17±0.05 dex
Rotational velocity (v sin i)1±1 km/s
Age2.13 Gyr
Other designations
AG+57°460, BD+57°787, GC 5139, HD 26755, HIP 19983, HR 1313, SAO 24514
Database references
SIMBADdata

HD 26755, also known as HR 1313, is a spectroscopic binary located in the northern circumpolar constellation Camelopardalis, the giraffe. It has an apparent magnitude of 5.72, making it faintly visible to the naked eye under ideal conditions. Gaia DR3 parallax measurements place the system at a distance of 271 light years and is currently drifting closer with a heliocentric radial velocity of −38 km/s. At its current distance, HD 26755's brightness is diminished by 0.19 magnitudes due to interstellar dust.

The visible component is an evolved red giant with a stellar classification of K1 III. It is estimated to be 2.13 billion years old, enough time for the star to exhaust its core hydrogen and evolve to become a red giant. It has cooled and expanded to 9.4 times the Sun's radius. It has 1.68 times the mass of the Sun and radiates 42.5 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,717 K, giving it an orange hue when viewed in the night sky. HD 26755 is a metal enriched star with an iron abundance 48% greater than the Sun. It spins slowly with a projected rotational velocity of 1 km/s, which is poorly constrained.

References

  1. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 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.
  3. 1 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.
  4. ↑ Mishenina, T. V.; Bienaymé, O.; Gorbaneva, T. I.; Charbonnel, C.; Soubiran, C.; Korotin, S. A.; Kovtyukh, V. V. (2006). "Elemental abundances in the atmosphere of clump giants". Astronomy and Astrophysics. 456 (3): 1109. arXiv:astro-ph/0605615. Bibcode:2006A&A...456.1109M. doi:10.1051/0004-6361:20065141.
  5. 1 2 Appenzeller, Immo (April 1967). "MK Spectral Types for 185 Bright Stars". Publications of the Astronomical Society of the Pacific. 79 (467): 102. Bibcode:1967PASP...79..102A. doi:10.1086/128449. eISSN 1538-3873. ISSN 0004-6280.
  6. ↑ Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication. Bibcode:1970Priv.........0H.
  7. 1 2 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.
  8. ↑ Griffin, R. F. (August 2012). "Spectroscopic binary orbits from photoelectric radial velocities - Paper 225: HR 1313, HR 3567, HR 3907, and HR 6239; with a note on delta Boo, HD 146815, 64 Aql, and 75 Dra". The Observatory. 132 (4): 234–252. Bibcode:2012Obs...132..234G. ISSN 0029-7704.
  9. 1 2 3 4 Dotter, Aaron; Chaboyer, Brian; Jevremović, Darko; Kostov, Veselin; Baron, E.; Ferguson, Jason W. (September 2008). "The Dartmouth Stellar Evolution Database". The Astrophysical Journal Supplement Series. 178 (1): 89–101. arXiv:0804.4473. Bibcode:2008ApJS..178...89D. doi:10.1086/589654. eISSN 1538-4365. ISSN 0067-0049.
  10. ↑ 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.
  11. 1 2 3 4 5 Feuillet, Diane K.; Bovy, Jo; Holtzman, Jon; Girardi, Léo; MacDonald, Nick; Majewski, Steven R.; Nidever, David L. (20 January 2016). "Determining Ages of APOGEE Giants with Known Distances". The Astrophysical Journal. 817 (1): 40. arXiv:1511.04088. Bibcode:2016ApJ...817...40F. doi:10.3847/0004-637X/817/1/40. eISSN 1538-4357.
  12. 1 2 3 De Medeiros, J. R.; Da Silva, J. R. P.; Maia, M. R. G. (20 October 2002). "The Rotation of Binary Systems with Evolved Components". The Astrophysical Journal. 578 (2): 943–950. arXiv:astro-ph/0207288. Bibcode:2002ApJ...578..943D. doi:10.1086/342613. eISSN 1538-4357. ISSN 0004-637X.
  13. ↑ "HD 26755". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 14 December 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.
  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.