Astronomy:15 Draconis
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Short description: Star in the constellation Draco
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Draco |
| Right ascension | 16h 27m 59.01603s[1] |
| Declination | +68° 46′ 05.3051″[1] |
| Apparent magnitude (V) | 4.94[2] |
| Characteristics | |
| Spectral type | B9.5IV[3] |
| B−V color index | −0.051±0.006[2] |
| Astrometry | |
| Radial velocity (Rv) | −6.7±2.8[2] km/s |
| Proper motion (μ) | RA: −24.818[1] mas/yr Dec.: +33.623[1] mas/yr |
| Parallax (π) | 7.2102 ± 0.1296[1] mas |
| Distance | 452 ± 8 ly (139 ± 2 pc) |
| Absolute magnitude (MV) | −0.93[2] |
| Details | |
| Mass | 2.6[4] M☉ |
| Radius | 4.9[4] R☉ |
| Luminosity | 213[4] L☉ |
| Surface gravity (log g) | 3.47[4] cgs |
| Temperature | 9,994[4] K |
| Rotational velocity (v sin i) | 154[5] km/s |
| Age | 306[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
15 Draconis is a single[8] star in the northern circumpolar constellation of Draco, located 452 light years away from the Sun. 15 Draconis is the Flamsteed designation; it also has the Bayer designation A Draconis.[9] This object is visible to the naked eye as a white-hued star with an apparent visual magnitude of 4.94.[2] It is moving closer to the Earth with a heliocentric radial velocity of −7 km/s.[2]
This star has a stellar classification of A0 III,[10] matching that of an A-type giant star. It has a relatively high rate of spin with a projected rotational velocity of 154 km/s.[5] The star is radiating 213 times the Sun's luminosity from its photosphere at an effective temperature of 9,994 K.[4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series 99: 135. doi:10.1086/192182. Bibcode: 1995ApJS...99..135A.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ 5.0 5.1 Royer, F. et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics 393: 897–911, doi:10.1051/0004-6361:20020943, Bibcode: 2002A&A...393..897R
- ↑ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771. doi:10.1134/S1063773712120031. Bibcode: 2012AstL...38..771G.
- ↑ "HD 40409". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+40409.
- ↑ 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.
- ↑ Kostjuk, N. D. (2004). "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)". VizieR On-line Data Catalog: IV/27A. Originally Published in: Institute of Astronomy of Russian Academy of Sciences (2002) 4027. Bibcode: 2004yCat.4027....0K.
- ↑ Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal 77: 750–755, doi:10.1086/111348, Bibcode: 1972AJ.....77..750C.
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