Zeta1 Scorpii
| |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 53m 59.72650s[1] |
| Declination | −42° 21′ 43.3063″[1] |
| Apparent magnitude (V) | 4.705[2] (4.66 to 4.86)[3] |
| Characteristics | |
| Spectral type | B1.5 Iae[4] |
| U−B color index | −0.567[2] |
| B−V color index | +0.480[2] |
| Variable type | SDOR:[3] |
| Astrometry | |
| Radial velocity (Rv) | −26.0[5] km/s |
| Proper motion (μ) | RA: −1.01[1] mas/yr Dec.: −4.01[1] mas/yr |
| Parallax (π) | 1.27 ± 0.25[1] mas |
| Distance | approx. 2,600 ly (approx. 800 pc) |
| Absolute magnitude (MV) | −8.5[4] |
| Details | |
| Mass | 36[4] M☉ |
| Radius | 103[4] R☉ |
| Luminosity (bolometric) | 850,000[4] L☉ |
| Surface gravity (log g) | 1.7[4] cgs |
| Temperature | 17,200[4] K |
| Rotational velocity (v sin i) | 60[6] km/s |
| Age | 6.5 ± 0.1[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Zeta1 Scorpii (Zeta1 Sco, ζ1 Scorpii, ζ1 Sco) is a B-type hypergiant star in the constellation of Scorpius.[8] It has an apparent visual magnitude which varies between 4.66 and 4.86.[3] It is a member of the Scorpius OB1 association,[9] and the open star cluster NGC 6231, also known as the "northern jewel box" cluster. Around 36 times as massive as the Sun, it is also one of the most luminous stars known in the Galaxy, with an estimated bolometric luminosity of around 850,000 times that of the Sun and a radius 103 times that of the Sun.[4]
The stellar wind from this supergiant is expelling matter from the star at the rate of 1.55 × 10−6 solar masses per year, or roughly the equivalent to the Sun's mass every 640,000 years.[4]
ζ1 Scorpii forms a naked eye double with ζ2 Scorpii, but the stars are merely coincidentally near in the line of sight from Earth. ζ2 is a mere 155 light years distant and much less luminous in real terms. ζ1 Scorpii can also be distinguished from ζ2, due to the latter's orange hue especially in long-exposure photographs.
References
- 1 2 3 4 5 van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752v1
, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 Note: see VizieR catalogue I/311. - 1 2 3 Kozok, J. R. (September 1985), "Photometric observations of emission B-stars in the southern Milky Way", Astronomy and Astrophysics Supplement Series, 61: 387–405, Bibcode:1985A&AS...61..387K
- 1 2 3 zet 1 Sco, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 20, 2009. (Quick look: Zet+1+Sco)
- 1 2 3 4 5 6 7 8 9 Clark, J. S.; Najarro, F.; Negueruela, I.; Ritchie, B. W.; Urbaneja, M. A.; Howarth, I. D. (2012). "On the nature of the galactic early-B hypergiants". Astronomy & Astrophysics. 541: A145. arXiv:1202.3991. Bibcode:2012A&A...541A.145C. doi:10.1051/0004-6361/201117472.
- ↑ Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick, eds., "The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and their Applications, University of Toronto: International Astronomical Union, 30: 57, Bibcode:1967IAUS...30...57E
- ↑ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1), Bibcode:1970CoAsi.239....1B
- ↑ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x
- 1 2 HIP 82671 -- Emission-line Star, database entry, SIMBAD. Accessed on line November 20, 2009.
- ↑ Zeta-1 Sco, Stars, Jim Kaler. Accessed on line November 20, 2009.