CL Draconis
CL Draconis (circled), with the obsolete constellation Quadrans Muralis in the background.
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 15h 57m 47.44180s[1]
Declination +54° 44′ 59.1428″[1]
Apparent magnitude (V) 4.96[2]
Characteristics
Spectral type F0 IV[3]
B−V color index 0.269±0.008[2]
Variable type δ Sct[4]
Astrometry
Radial velocity (Rv)−11.0±4.2[5] km/s
Proper motion (μ) RA: −151.643[1] mas/yr
Dec.: +107.519[1] mas/yr
Parallax (π)29.9305 ± 0.1368 mas[1]
Distance109.0 ± 0.5 ly
(33.4 ± 0.2 pc)
Absolute magnitude (MV)2.33[2]
Details
Mass1.68±0.01[6] M☉
Luminosity10.2+0.2
−0.3[6] L☉
Surface gravity (log g)4.04±0.14[7] cgs
Temperature7,439±253[7] K
Metallicity [Fe/H]0.04±0.10[8] dex
Rotational velocity (v sin i)165[6] km/s
Age643[7] Myr
Other designations
CL Dra, AG+54° 1023, BD+55° 1793, FK5 595, HD 143466, HIP 78180, HR 5960, SAO 29727[9]
Database references
SIMBADdata

CL Draconis is a single[10] star in the northern circumpolar constellation of Draco. It can be viewed with the naked eye, having an apparent visual magnitude of 4.96.[2] The distance to this star, as determined from its annual parallax shift of 29.9 mas,[1] is 109 light years. It is moving closer to the Earth with a heliocentric radial velocity of −11 km/s.[5] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.185″/yr.[11]

Based upon a stellar classification of F0 IV,[3] this is an aging F-type subgiant star that has consumed the hydrogen at its core. It is spinning rapidly with a projected rotational velocity of 165 km/s,[6] giving it an oblate shape with an equatorial bulge that is estimated to be 8% larger than the polar radius.[12]

caption=Visual band light curves for CL Draconis, adapted from DuPuy and Burgoyne (1983)[13]

CL Draconis is a Delta Scuti variable, changing brightness with an amplitude of 0.010 magnitude over a period of 1.83 hours.[14] CL Dra has 1.68[6] times the mass of the Sun and is radiating 10.2[6] times the Sun's luminosity from its photosphere at an effective temperature of 7,439 K.[7]

It was transferred from Draco to Quadrans Muralis. Later when the International Astronomical Union officially recognised constellations, Quadrans Muralis became obsolete, so this star was moved back to Draco.

References

  1. 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. 1 2 3 4 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, S2CID 119257644.
  3. 1 2 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  4. ↑ Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  5. 1 2 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  6. 1 2 3 4 5 6 Zorec, J.; Royer, F. (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, S2CID 55586789
  7. 1 2 3 4 David, Trevor J.; Hillenbrand, Lynne A. (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, S2CID 33401607.
  8. ↑ Gáspár, András; et al. (August 2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal, 826 (2): 14, arXiv:1604.07403, Bibcode:2016ApJ...826..171G, doi:10.3847/0004-637X/826/2/171, S2CID 119241004, 171.
  9. ↑ "CL Dra". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 September 2018.
  10. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  11. ↑ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
  12. ↑ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
  13. ↑ DuPuy, D. L.; Burgoyne, L. G. (January 1983). "HR 5960: new observations and period search". Publications of the Astronomical Society of the Pacific. 95: 61–68. Bibcode:1983PASP...95...61D. doi:10.1086/131118. S2CID 127849050.
  14. ↑ Rodríguez, E.; et al. (June 2000), "A revised catalogue of δ Sct stars", Astronomy and Astrophysics Supplement, 144 (3): 469–474, Bibcode:2000A&AS..144..469R, doi:10.1051/aas:2000221, hdl:10261/226673.
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