HD 23523

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]

HD 23523
Location of HD 23523 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
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 mas/yr[1]
Dec.: −61.457 mas/yr[1]
Parallax (π)13.9498 ± 0.3245 mas[1]
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, AG+63°280, BD+62°612, GC 4560, HD 23523, HIP 17891, HR 1158, SAO 12917, WDS J03496+6318AB[10]
Database references
SIMBADdata

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. 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.
  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. S2CID 17128864.
  3. 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. S2CID 119533755.
  4. 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. Bibcode:1969AJ.....74..375C. doi:10.1086/110819. ISSN 0004-6256. S2CID 121555804.
  5. Ljunggren, B.; Oja, T. (1965). "Photoelectric measurements of magnitudes and colours for 849 stars". Arkiv för Astronomi. 3: 439–465. Bibcode:1965ArA.....3..439L. ISSN 0004-2048.
  6. 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.
  7. Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
  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. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774. eISSN 1432-0746. ISSN 0004-6361. S2CID 122594428.
  9. Cvetkovic, Zorica; Ninkovic, S. (June 2010). "On the component masses of visual binaries". Serbian Astronomical Journal. 180 (180): 71–80. Bibcode:2010SerAJ.180...71C. doi:10.2298/SAJ1080071C. S2CID 54938242.
  10. "HD 23523". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 22, 2023.
  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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.
  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. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
  13. Carbillet, M.; Lopez, B.; Aristidi, E.; Bresson, Y.; Aime, C.; Ricort, G.; Prieur, J. -L.; Koechlin, L.; Helmer, G.; Lefevre, J.; Cruzalebes, P. (October 1996). "Discovery of a new bright close double star". Astronomy and Astrophysics. 314: 112–114. Bibcode:1996A&A...314..112C. ISSN 0004-6361. S2CID 116630348.
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