Astronomy:HD 32356

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Short description: Astrometric binary in Camelopardalis
HD 32356
Location of HD 32356 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Camelopardalis[1]
Right ascension  05h 06m 29.70999s[2]
Declination +61° 10′ 11.0995″[2]
Apparent magnitude (V) 5.99±0.01[3]
Characteristics
Spectral type K5 II[4]
B−V color index +1.36[5]
Astrometry
Radial velocity (Rv)−45.2±1.2[6] km/s
Proper motion (μ) RA: +39.428[2] mas/yr
Dec.: −80.907[2] mas/yr
Parallax (π)5.8511 ± 0.0881[2] mas
Distance557 ± 8 ly
(171 ± 3 pc)
Absolute magnitude (MV)+0.23[1]
Details
Mass1.18[7] M☉
Radius30.67±1.58[8] R☉
Luminosity300+9−8[2] L☉
Surface gravity (log g)1.56±0.11[9] cgs
Temperature4,111±13[10] K
Metallicity [Fe/H]−0.30±0.05[10] dex
Rotational velocity (v sin i)<1.0[11] km/s
Age4.27+0.86−0.72[9] Gyr
Other designations
BD+60°857, GC 6202, HD 32356, HIP 23766, HR 1624, SAO 13369[12]
Database references
SIMBADdata

HD 32356, also designated as HR 1624, is an astrometric binary[13] located in the northern circumpolar constellation Camelopardalis, the giraffe, near β Camelopardalis. The visible component is faintly visible to the naked eye as an orange-hued star with an apparent magnitude of 5.99.[3] Gaia DR3 parallax measurements imply a distance of 557 light-years[2] and it is currently drifting closer with a heliocentric radial velocity of −45.2 km/s.[6] At its current distance, HD 32356's brightness is diminished by an interstellar extinction of 0.29 magnitudes[14] and it has an absolute magnitude of +0.23.[1]

The visible component has a stellar classification of K5 II,[4] indicating that it is an evolved K-type bright giant that has ceased hydrogen fusion at its core and left the main sequence. It has 1.18 times the mass of the Sun[7] but at the age of 4.27 billion years,[9] it has expanded to 30.67 times the radius of the Sun.[8] It radiates 300 times the luminosity of the Sun[2] from its enlarged photosphere at an effective temperature of 4,111 K.[10] HD 32356 A is metal deficient with an iron abundance roughly half of the Sun's[10] and it spins too slowly for its projected rotational velocity to be measured accurately.[11]

References

  1. ↑ 1.0 1.1 1.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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.
  3. ↑ 3.0 3.1 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. 
  4. ↑ 4.0 4.1 Bartaya, R. A. (1979). "Catalog of spectral and luminosity classes of 10396 stars in Kapteyn's selected areas NN 2-43.". Abastumanskaia Astrofizicheskaia Observatoriia Byulleten 51: 1. ISSN 0258-7327. Bibcode: 1979AbaOB..51....1B. 
  5. ↑ Ljunggren, B.; Oja, T. (1965). "Photoelectric measurements of magnitudes and colours for 849 stars". Arkiv för Astronomi 3: 439–465. ISSN 0004-2048. Bibcode: 1965ArA.....3..439L. 
  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. ↑ 7.0 7.1 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. 
  8. ↑ 8.0 8.1 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004). "The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry". 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 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. doi:10.3847/0004-637X/817/1/40. Bibcode: 2016ApJ...817...40F. 
  10. ↑ 10.0 10.1 10.2 10.3 Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2 December 2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics 525: A71. doi:10.1051/0004-6361/201015014. ISSN 0004-6361. Bibcode: 2011A&A...525A..71W. 
  11. ↑ 11.0 11.1 de Medeiros, J. R.; Mayor, M. (November 1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series 139 (3): 433–460. doi:10.1051/aas:1999401. ISSN 0365-0138. Bibcode: 1999A&AS..139..433D. 
  12. ↑ "HD 32356". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+32356. 
  13. ↑ Frankowski, A.; Jancart, S.; Jorissen, A. (19 December 2006). "Proper-motion binaries in the Hipparcos catalogue: Comparison with radial velocity data". Astronomy & Astrophysics 464 (1): 377–392. doi:10.1051/0004-6361:20065526. ISSN 0004-6361. Bibcode: 2007A&A...464..377F. 
  14. ↑ 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. 



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