HD 26755

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HD 26755
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 26755 on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Camelopardalis [1]
Right ascension 04h 17m 08.09353s [2]
Declination +57° 51′ 37.1513″ [2]
Apparent magnitude  (V)5.72±0.01 [3]
Characteristics
Evolutionary stage red clump [4]
Spectral type K1 III [5]
B−V color index +1.09 [6]
Astrometry
Radial velocity (Rv)−38.2±1.6 [7] km/s
Proper motion (μ)RA: +29.108 mas/yr [2]
Dec.: −25.942 mas/yr [2]
Parallax (π)12.0207±0.1939  mas [2]
Distance 271 ± 4  ly
(83 ± 1  pc)
Absolute magnitude  (MV)+1.21 [1]
Orbit [8]
PrimaryA
CompanionB
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
Mass 1.68 [9]   M☉
Radius 9.44±0.47 [10]   R☉
Luminosity 42.5±1.3 [2]   L☉
Surface gravity (log g)2.58±0.11 [11]   cgs
Temperature 4,717±92 [11]   K
Metallicity [Fe/H]+0.17±0.05 [11]   dex
Rotational velocity (v sin i)1±1 [12]  km/s
Age 2.13 [9]   Gyr
Other designations
AG+57°460, BD+57°787, GC 5139, HD 26755, HIP 19983, HR 1313, SAO 24514 [13]
Database references
SIMBAD data

HD 26755, also known as HR 1313, is a spectroscopic binary [12] [14] located in the northern circumpolar constellation Camelopardalis, the giraffe. It has an apparent magnitude of 5.72, [3] 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 [2] and is currently drifting closer with a heliocentric radial velocity of −38  km/s . [7] At its current distance, HD 26755's brightness is diminished by 0.19 magnitudes due to interstellar dust. [15]

The visible component is an evolved red giant with a stellar classification of K1 III. [5] It is estimated to be 2.13 billion years old, [9] 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 [9] and radiates 42.5 times the luminosity of the Sun [2] from its enlarged photosphere at an effective temperature of 4,717  K , [11] 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. [11] It spins slowly with a projected rotational velocity of 1  km/s , [12] 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.
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