Theta Scorpii
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(Redirected from Sargas)
 The position of θ Scorpii in the Scorpius constellation. |
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Scorpius |
| Right ascension | 17h 37m 19.12985s[1] |
| Declination | -42° 59′ 52.1808″[1] |
| Apparent magnitude (V) | +1.87[2] |
| Characteristics | |
| Spectral type | F0 II[3] |
| U−B color index | +0.21[2] |
| B−V color index | +0.40[2] |
| Astrometry | |
| Radial velocity (Rv) | +1.4[4] km/s |
| Proper motion (μ) | RA: +5.54[1] mas/yr Dec.: -3.12[1] mas/yr |
| Parallax (π) | 10.86 ± 1.49[1] mas |
| Distance | approx. 300 ly (approx. 90 pc) |
| Absolute magnitude (MV) | -2.75 |
| Details | |
| Mass | 5.66 ± 0.65[5] M☉ |
| Radius | 20 R☉ |
| Luminosity | 1,834[5] L☉ |
| Surface gravity (log g) | 2.4 ± 0.2[6] |
| Temperature | 7,268[5] K |
| Rotational velocity (v sin i) | 105 km/s |
| Other designations | |
Theta Scorpii (θ Sco, θ Scorpii) is a star in the constellation Scorpius. It has the traditional name Sargas, of Sumerian origin.
θ Scorpii A is a yellow giant of spectral type F1 II shining with a luminosity of 960 times that of the Sun from a distance of 272 light years. The radius of this star is 20 solar radii and its surface temperature is 7200 kelvins. The mass of Sargas has been determined to be 3.7 times the solar mass.
It has a magnitude 5.36 companion at an angular separation of 6.470 arcseconds.[8]
In Chinese, it is referred to as 尾宿五 (Mandarin: wěi xiù wǔ), the Fifth Star of the Tail.
[edit] Modern legacy
Sargas appears on the flag of Brazil, symbolising the state of Alagoas.[9]
[edit] References
- ^ a b c d e van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. Bibcode 2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- ^ a b c Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99), Bibcode 1966CoLPL...4...99J
- ^ Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode 1978mcts.book.....H
- ^ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institute of Washington D.C.. Bibcode 1953GCRV..C......0W.
- ^ a b c Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten 331 (4): 349, Bibcode 2010AN....331..349H, doi:10.1002/asna.200911355
- ^ Samedov, Z. A., "Investigation of the atmospheres of the stars ι1 Sco (F2 Ia) and θ Sco (F1 II)", Astrophysics 28 (3): 335–341, doi:10.1007/BF01112969
- ^ "tet Sco -- Variable Star", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Theta+Scorpii, retrieved 2012-02-18
- ^ 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. Bibcode 2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
- ^ "Astronomy of the Brazilian Flag". FOTW Flags Of The World website. http://www.fotw.net/flags/br_astro.html.
[edit] External links
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