Tu banner alternativo

Delta Horologii

Nowadays, Delta Horologii is a topic that arouses great interest in society. (Name of person) is a figure that has captured the attention of millions of people around the world. From his shocking discovery to his most recent achievements, Delta Horologii has left an indelible mark on history. In this article, we will thoroughly explore the life and work of Delta Horologii, analyzing his impact in various areas and unraveling the reasons that have made him a reference for future generations. Join us on this journey of discovery and admiration for Delta Horologii.

Tu banner alternativo
Delta Horologii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Horologium
Right ascension 04h 10m 50.58927s[1]
Declination −41° 59′ 36.8537″[1]
Apparent magnitude (V) 4.93[2] (5.15 + 7.29)[3]
Characteristics
Spectral type A9 V[3]
U−B color index +0.084[2]
B−V color index +0.338[2]
Astrometry
Radial velocity (Rv)+38.3±2.6[4] km/s
Proper motion (μ) RA: +199.08[1] mas/yr
Dec.: +70.18[1] mas/yr
Parallax (π)18.24±0.41 mas[1]
Distance179 ± 4 ly
(55 ± 1 pc)
Absolute magnitude (MV)1.50[5]
Details
δ Hor A
Mass1.41[6] M☉
Surface gravity (log g)3.71±0.14[6] cgs
Temperature7,033±239[6] K
Metallicity −0.32[7] dex
Rotational velocity (v sin i)220.1±11.0[5] km/s
Age768[6] Myr
δ Hor B
Rotational velocity (v sin i)51.7±2.6[5] km/s
Other designations
δ Hor, CD−42°1400, HD 26612, HIP 19515, HR 1302, SAO 216682, WDS J04108-4200AB[8]
Database references
SIMBADdata

Delta Horologii (δ Horologii) is a binary star[3] system in the constellation Horologium. It is visible to the naked eye with a combined apparent visual magnitude of 4.93.[2] As of 2014, the pair had an angular separation of 0.20 arc seconds along a position angle of 24°.[9] Based upon an annual parallax shift of 18.24 mas as seen from Earth,[1] it is located 179 ± 4 light years from the Sun.

The primary, component A, is a magnitude 5.15 A-type main sequence star with a stellar classification of A9 V.[3] At the estimated age of 768 million years,[6] it is spinning rapidly with a projected rotational velocity of 220 km/s,[5] giving the star an oblate shape with an equatorial bulge that is 15% larger than the polar radius.[10] The star has 1.4[6] times the mass of the Sun.

The secondary has an apparent magnitude of 7.29.[3]

References

  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. ^ a b c d Cousins, A. W. J. (1983), "UBV photometry of E region standard stars of intermediate brightness", South African Astronomical Observatory Circular, 7 (7): 36–46, Bibcode:1983SAAOC...7...36C.
  3. ^ a b c d e Eggleton, P. P.; Tokovinin, A. A. (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, S2CID 14878976.
  4. ^ 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.
  5. ^ a b c d Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
  6. ^ a b c d e f 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.
  7. ^ Casagrande, L.; et al. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics, 530 (A138): 21, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
  8. ^ "del Hor -- Double or multiple star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-04-25.
  9. ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
  10. ^ Belle, G. T. (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.
Wikious
Boobota
Sagapedia