Astronomy:45 Draconis
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Short description: Star in the constellation Draco
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Draco |
| Right ascension | 18h 32m 34.52197s[1] |
| Declination | +57° 02′ 44.1416″[1] |
| Apparent magnitude (V) | 4.78[2] |
| Characteristics | |
| Spectral type | F7Ib[3] |
| B−V color index | +0.59[2] |
| Astrometry | |
| Radial velocity (Rv) | −12.50[4] km/s |
| Proper motion (μ) | RA: 0.400[1] mas/yr Dec.: −7.674[1] mas/yr |
| Parallax (π) | 0.9287 ± 0.0913[1] mas |
| Distance | 3,500 ± 300 ly (1,100 ± 100 pc) |
| Absolute magnitude (MV) | −3.5[5] |
| Details | |
| Mass | 8.2[3] M☉ |
| Radius | 62[6] R☉ |
| Luminosity | 5,450[7] L☉ |
| Surface gravity (log g) | 2.1[3] - 2.4[5] cgs |
| Temperature | 6,151[5] K |
| Metallicity [Fe/H] | −0.04[5] dex |
| Rotational velocity (v sin i) | 10[3] km/s |
| Age | 33[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
45 Draconis is a single[10] star located in the northern circumpolar constellation of Draco, around 3,500 light years from the Earth.[1] 45 Draconis is the Flamsteed designation, while it has the Bayer designation of d Draconis. This object is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.78.[2] Radial velocity measurements indicate it is moving closer to the Sun at the rate of −12.5 km/s.[4]
Lyubimkov et al. (2012) assigned this star a stellar classification of F7Ib,[3] matching an F-type supergiant. It is approximately 33 million years old with 8.2[3] times the mass of the Sun and about 62[6] times the Sun's radius. The star is radiating 5,450[7] times the Sun's luminosity from its photosphere at an effective temperature of 6,151 K.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ 2.0 2.1 2.2 Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal 147 (6): 137. doi:10.1088/0004-6256/147/6/137. Bibcode: 2014AJ....147..137L.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Lyubimkov, Leonid S.; Lambert, David L.; Kaminsky, Bogdan M.; Pavlenko, Yakov V.; Poklad, Dmitry B.; Rachkovskaya, Tamara M. (2012). "Lithium abundance in atmospheres of F- and G-type supergiants and bright giants". Monthly Notices of the Royal Astronomical Society 427 (1): 11–26. doi:10.1111/j.1365-2966.2012.21617.x. Bibcode: 2012MNRAS.427...11L.
- ↑ 4.0 4.1 Gontcharov, G. A. (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. Bibcode: 2006AstL...32..759G.
- ↑ 5.0 5.1 5.2 5.3 5.4 Kovtyukh, V. V.; Gorlova, N. I.; Belik, S. I. (2012). "Accurate luminosities from the oxygen λ7771-4 Å triplet and the fundamental parameters of F-G supergiants". Monthly Notices of the Royal Astronomical Society 423 (4): 3268. doi:10.1111/j.1365-2966.2012.21117.x. Bibcode: 2012MNRAS.423.3268K.
- ↑ 6.0 6.1 Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy and Astrophysics 367 (2): 521. doi:10.1051/0004-6361:20000451. Bibcode: 2001A&A...367..521P.
- ↑ 7.0 7.1 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343–357. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode: 2012MNRAS.427..343M.
- ↑ Lyubimkov, Leonid S.; Lambert, David L.; Rostopchin, Sergey I.; Rachkovskaya, Tamara M.; Poklad, Dmitry B. (2010). "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society 402 (2): 1369. doi:10.1111/j.1365-2966.2009.15979.x. Bibcode: 2010MNRAS.402.1369L.
- ↑ "d Dra". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=d+Dra.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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