Summary
13 Scorpii, also known by its Bayer designation c2 Scorpii, is a binary star in the constellation Scorpius. Its apparent magnitude is 4.57,[2] meaning it can be faintly seen with the naked eye. Based on parallax estimates made by the Hipparcos spacecraft, the system is located about 480 light-years (147 parsecs) away.[1] It is located within the Upper Scorpius subgroup of the Scorpius–Centaurus association.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 12m 18.20490s[1] |
| Declination | −27° 55′ 34.9457″[1] |
| Apparent magnitude (V) | +4.568[2] |
| Characteristics | |
| Spectral type | B2V[3] |
| U−B color index | −0.74[4] |
| B−V color index | −0.16[4] |
| Astrometry | |
| Radial velocity (Rv) | 0 ± 5[5] km/s |
| Proper motion (μ) | RA: −10.38[1] mas/yr Dec.: −23.94[1] mas/yr |
| Parallax (π) | 6.81 ± 0.16 mas[1] |
| Distance | 480 ± 10 ly (147 ± 3 pc) |
| Orbit[3] | |
| Period (P) | 5.7805 d |
| Eccentricity (e) | 0.19 |
| Periastron epoch (T) | JD 2443298.40 |
| Argument of periastron (ω) (secondary) | 115° |
| Semi-amplitude (K1) (primary) | 31.5 km/s |
| Details | |
| 13 Sco A | |
| Mass | 7.80[6] M☉ |
| Luminosity | 3020[7] L☉ |
| Temperature | 24000[7] K |
| Rotational velocity (v sin i) | 165[8] km/s |
| Age | 11[6] Myr |
| 13 Sco B | |
| Mass | 1.12[6] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
13 Scorpii is a spectroscopic binary, meaning the two stars are too close to be individually resolved, but periodic Doppler shifts in the star's spectrum indicate there must be orbital motion. In this case, light from only one of its stars can be detected and it is a double-lined spectroscopic binary.[3] The two have an orbital period of 5.7805 days and an eccentricity of 0.19.[3] The primary star, at 11 million years old,[6] is a B-type main-sequence star with a spectral type of B2V.[3] While the primary's mass is estimated to be about 7.8 M☉, its companion is thought to have a mass of 1.12 M☉.[6]
References edit
- ^ a b c d e f van Leeuwen, F.; et al. (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.
- ^ a b Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
- ^ a b c d e Pourbaix, D.; et al. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
- ^ a b Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
- ^ Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". In Alan Henry Batten; John Frederick Heard (eds.). Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 held at the University of Toronto 20-24 June, 1966. International Astronomical Union. Vol. 30. London: Academic Press. p. 57. Bibcode:1967IAUS...30...57E.
- ^ a b c d e f Bonavita, M.; et al. (2016). "SPOTS: The Search for Planets Orbiting Two Stars. II. First constraints on the frequency of sub-stellar companions on wide circumbinary orbits". Astronomy & Astrophysics. 593: A38. arXiv:1605.03962. Bibcode:2016A&A...593A..38B. doi:10.1051/0004-6361/201628231. S2CID 55950739.
- ^ a b Hernández, J.; Calvet, N.; Hartmann, L.; Briceño, C.; Sicilia-Aguilar, A.; Berlind, P. (2005). "Herbig Ae/Be Stars in nearby OB Associations". The Astronomical Journal. 129 (2): 856–871. arXiv:astro-ph/0410494. Bibcode:2005AJ....129..856H. doi:10.1086/426918. S2CID 17672346.
- ^ Strom, S. E.; Wolff, S. C.; Dror, D. H. A. (2005). "B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch?". The Astronomical Journal. 129 (2): 809–828. arXiv:astro-ph/0410337. Bibcode:2005AJ....129..809S. doi:10.1086/426748. S2CID 15059129.
- ^ "* c02 Sco". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 10 April 2017.