Astronomy:HD 23523

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Short description: Visual binary; Camelopardalis
HD 23523
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 23523 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Camelopardalis
Right ascension  03h 49m 36.58592s[1]
Declination +63° 17′ 49.0518″[1]
Apparent magnitude (V) 5.82[2] (6.31 + 7.11)[3]
Characteristics
Spectral type A5 Vn[4]
B−V color index +0.18[5]
Astrometry
Radial velocity (Rv)−9.6±3.4[6] km/s
Proper motion (μ) RA: −11.630[1] mas/yr
Dec.: −61.457[1] mas/yr
Parallax (π)13.9498 ± 0.3245[1] mas
Distance234 ± 5 ly
(72 ± 2 pc)
Absolute magnitude (MV)+1.55[7] (combined)
Orbit[8]
PrimaryHD 23523A[3]
CompanionHD 23523B[3]
Period (P)10.180±0.509 yr
Semi-major axis (a)0.1020±0.0031″
Eccentricity (e)0.441
Details
A
Mass1.75 or 1.81[9] M☉
B
Mass1.64 or 1.51[9] M☉
Other designations
Moaï 1, BD+62°612, GC 4560, HD 23523, HIP 17891, HR 1158, SAO 12917, WDS J03496+6318AB[10]
Database references
SIMBADdata

HD 23523 (HR 1158) is a binary star[11] located in the northern circumpolar constellation Camelopardalis. It has a combined apparent magnitude of 5.82,[2] making it faintly visible to the naked eye under ideal conditions. When resolved, the primary has an apparent magnitude of 6.31 while the secondary has a magntiude of 7.11.[3] The system is located relatively close at a distance of about 234 light-years based on Gaia DR3 parallax measurements[1] and it currently drifting closer with a somewhat heliocentric radial velocity of −9.6 km/s.[6] At its current distance, HD 23523's combined brightness is diminished by 0.16 magnitudes due to interstellar extinction[12] and it has a combined absolute magnitude of +1.55.[7]

The system was first discovered to be a double star in 1996 by Marcel Carbillet and colleagues after speckle interferometry observations.[13] The stars are only about a tenth of an arcsecond apart,[3] making observing their individual properties difficult. The discovery paper suggested that the two components might be equal based on the dynamical mass.[13] Overall, HD 23523 has a stellar classification of A5 Vn,[4] indicating that it is an A-type main-sequence star with broad or nebulous absorption lines due to rapid rotation. The primary has a mass either 1.75 or 1.81 times the mass of the Sun while the companion has a mass 1.64 or 1.51 times that of the Sun,[9] depending on the approach.

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 3.2 3.3 3.4 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. 
  4. ↑ 4.0 4.1 Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (April 1969). "A study of the bright stars. I. A catalogue of spectral classifications.". The Astronomical Journal 74: 375. doi:10.1086/110819. ISSN 0004-6256. Bibcode: 1969AJ.....74..375C. 
  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 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. ↑ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (October 2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics 546: A69. doi:10.1051/0004-6361/201219774. ISSN 0004-6361. Bibcode: 2012A&A...546A..69M. 
  9. ↑ 9.0 9.1 9.2 Cvetkovic, Zorica; Ninkovic, S. (June 2010). "On the component masses of visual binaries". Serbian Astronomical Journal 180 (180): 71–80. doi:10.2298/SAJ1080071C. Bibcode: 2010SerAJ.180...71C. 
  10. ↑ "HD 23523". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+23523. 
  11. ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  12. ↑ 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. 
  13. ↑ 13.0 13.1 Carbillet, M.; Lopez, B.; Aristidi, E.; Bresson, Y.; Aime, C.; Ricort, G.; Prieur, J. -L.; Koechlin, L. et al. (October 1996). "Discovery of a new bright close double star.". Astronomy and Astrophysics 314: 112–114. ISSN 0004-6361. Bibcode: 1996A&A...314..112C. 



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