HD 27322

Last updated
HD 27322
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 27322 on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Camelopardalis [1]
Right ascension 04h 21m 51.80623s [2]
Declination +56° 30′ 22.7351″ [2]
Apparent magnitude  (V)5.92±0.01 [3]
Characteristics
Evolutionary stage main sequence [4]
Spectral type A3 V [5] or A2 IV-V [6]
U−B color index +0.08 [7]
B−V color index +0.11 [7]
Astrometry
Radial velocity (Rv)−13±5 [8] km/s
Proper motion (μ)RA: −14.793 mas/yr [2]
Dec.: +7.466 mas/yr [2]
Parallax (π)10.4168±0.0907  mas
Distance 313 ± 3  ly
(96.0 ± 0.8  pc)
Absolute magnitude  (MV)+0.98 [1]
Details
A
Mass 1.9±0.1 [9]   M☉
Radius 2.64+0.11
−0.10 [10]   R☉
Luminosity 54.7+1.0
−0.9 [2]   L☉
Surface gravity (log g)3.88±0.14 [11]   cgs
Temperature 8,414+176
−173 [4]   K
Metallicity [Fe/H]−0.25 [12]   dex
Rotational velocity (v sin i)130±8 [6]  km/s
Age 640 [11]   Myr
B
Mass 1.30±0.04 [9]   M☉
Temperature 6,492±109 [9]   K
Metallicity [Fe/H]−0.50 [9]   dex
Rotational velocity (v sin i)20 [9]  km/s
Other designations
AG+56°463, BD+56°509, GC 5253, HD 27322, HIP 20380, HR 1342, SAO 24563 [13]
Database references
SIMBAD data

HD 27322, also known as HR 1342, is a binary star located in the northern circumpolar constellation Camelopardalis. The visible component is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.92. [3] The object is located relatively close at a distance of 313 light-years based on Gaia DR3 parallax measurements, [2] and it is drifting closer with a heliocentric radial velocity of approximately −13  km/s . [8] At its current distance, HD 27322's brightness is diminished by 0.24 magnitudes due to interstellar extinction [14] and it has an absolute magnitude of +0.98. [1]

HD 27322 A has a stellar classification of A3 V, [5] indicating that it is an ordinary A-type main-sequence star that is generating energy via hydrogen fusion at its core. Abt & Morell (1995) gave a hotter and slightly more evolved classification of A2 IV-V, [6] indicating that it is an A-type star with a luminosity class intermediate between a main sequence star and a subgiant. At the age of 640 million years, [11] HD 27322 A has completed 79.5% of its main sequence lifetime. [4] It has 1.9 times the mass of the Sun [9] and 2.64 times the radius of the Sun. [10] It radiates 54.7 times the luminosity of the Sun [2] from its photosphere at an effective temperature of 8,414  K . [4] HD 27322 A is metal deficient with an iron abundance 56% that of the Sun's ([Fe/H] = −0.25) [12] and it spins rapidly with a projected rotational velocity of 130  km/s . [6]

The object was generally classified as a solitary star. [15] However, evidence of HD 27322 being a binary first arose when an X-ray emission with a luminosity of 3.22×1020  W was detected around the star. [16] A-type stars are expected to be X-ray quiet, so it might be coming from a hidden companion. A 2016 spectroscopic survey detected a companion around HD 27322. [9] It has 1.3 times the mass of the Sun and it has an effective temperature of 6,492 K. [9] HD 27322 B is metal deficient with a [Fe/H] of −0.5 and it spins modestly with a projected rotational velocity of 20 km/s. [9]

References

  1. 1 2 3 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 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 Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI". Astronomy and Astrophysics Supplement Series. 89: 415. Bibcode:1991A&AS...89..415O. ISSN   0365-0138.
  4. 1 2 3 4 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv: 1201.2052 . Bibcode:2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691 . eISSN   1432-0746. ISSN   0004-6361. S2CID   55586789.
  5. 1 2 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.
  6. 1 2 3 4 Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi: 10.1086/192182 . ISSN   0067-0049. S2CID   120495962.
  7. 1 2 Guetter, H. H.; Hewitt, A. V. (1984). "Photoelectric UBV photometry for 317 PZT and VZT stars". Publications of the Astronomical Society of the Pacific. 96. IOP Publishing: 441. Bibcode:1984PASP...96..441G. doi: 10.1086/131362 . ISSN   0004-6280. S2CID   122222245.
  8. 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.
  9. 1 2 3 4 5 6 7 8 9 Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (25 July 2016). "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars". The Astronomical Journal. 152 (2): 40. arXiv: 1604.06456 . Bibcode:2016AJ....152...40G. doi: 10.3847/0004-6256/152/2/40 . eISSN   1538-3881. S2CID   119179065.
  10. 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881. hdl: 1721.1/124721 . S2CID   166227927.
  11. 1 2 3 David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv: 1501.03154 . Bibcode:2015ApJ...804..146D. doi: 10.1088/0004-637X/804/2/146 . eISSN   1538-4357. S2CID   33401607.
  12. 1 2 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. arXiv: 1904.11302 . Bibcode:2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765 . eISSN   1432-0746. ISSN   0004-6361. S2CID   131780028.
  13. ↑ "HD 27322". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved July 17, 2023.
  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. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711. S2CID   118879856.
  15. ↑ 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.
  16. ↑ Schröder, C.; Schmitt, J. H. M. M. (24 September 2007). "X-ray emission from A-type stars". Astronomy & Astrophysics. 475 (2): 677–684. Bibcode:2007A&A...475..677S. doi: 10.1051/0004-6361:20077429 . eISSN   1432-0746. ISSN   0004-6361. S2CID   120317590.
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