Lambda Scorpii
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Pronunciation | /ˈʃɔːlə/[1][2] |
| Right ascension | 17h 33m 36.520s[3] |
| Declination | −37° 06′ 13.76″[3] |
| Apparent magnitude (V) | 1.62 + 14.9 + 12.0[3][4] |
| Characteristics | |
| Spectral type | B1.5IV + B2IV[5][6] |
| U−B color index | −0.880[7] |
| B−V color index | −0.240[7] |
| Variable type | Beta Cephei (A)[8] |
| Astrometry | |
| Radial velocity (Rv) | −3.00[9] km/s |
| Proper motion (μ) | RA: −8.90[3][3] mas/yr Dec.: −29.95[3] mas/yr |
| Parallax (π) | 5.71 ± 0.90[3] mas |
| Distance | approx. 570 ly (approx. 180 pc) |
| Absolute magnitude (MV) | −3.70[10] |
| Orbit[11] | |
| Primary | A |
| Companion | B |
| Period (P) | 2.8825 yr |
| Semi-major axis (a) | 49.3 mas |
| Eccentricity (e) | 0.121 |
| Inclination (i) | 77.2° |
| Orbit[11] | |
| Primary | Aa |
| Companion | Ab |
| Period (P) | 5.9520 d |
| Eccentricity (e) | 0.26 |
| Semi-amplitude (K1) (primary) | 39.3 km/s |
| Details | |
| λ Sco Aa | |
| Mass | 10.4[5] M☉ |
| Radius | 8.8±1.2[8] R☉ |
| Luminosity | 36,300[8] L☉ |
| Surface gravity (log g) | 3.8[6] cgs |
| Temperature | 25,000±1,000[8] K |
| Rotation | 3.4±0.5 d[8] |
| Rotational velocity (v sin i) | 150[8] km/s |
| λ Sco B | |
| Mass | 8.1[5] M☉ |
| Radius | 4.7±1.0[8] R☉ |
| Surface gravity (log g) | 4.0[6] cgs |
| Temperature | 25,000±1,000[8] K |
| λ Sco Ab | |
| Mass | 1.8[5] M☉ |
| Other designations | |
Shaula, 35 Scorpii, 35 Sco, CD−37 11673, FK5 652, HD 158926, HIP 85927, HR 6527, SAO 208954, CCDM J17336-3706A/B/C | |
| Database references | |
| SIMBAD | data |
Lambda Scorpii is a triple star system and the second-brightest object in the constellation of Scorpius. It is also called Shaula. Lambda Scorpii is its Bayer designation, which is translated from λ Scorpii and abbreviated Lambda Sco or λ Sco. With an apparent visual magnitude of 1.62, it is one of the brightest stars in the night sky.
References
- ↑ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
- ↑ "IAU Catalog of Star Names". Retrieved 28 July 2016.
- 1 2 3 4 5 6 7 Van Leeuwen, F. (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.
- ↑ Reed, B. Cameron (2003), "Catalog of Galactic OB Stars", The Astronomical Journal, 125 (5): 2531–2533, Bibcode:2003AJ....125.2531R, doi:10.1086/374771.
- 1 2 3 4 Tango, W. J.; Davis, J.; Ireland, M. J.; Aerts, C.; Uytterhoeven, K.; Jacob, A. P.; Mendez, A.; North, J. R.; Seneta, E. B.; Tuthill, P. G. (2006). "Orbital elements, masses and distance of λ Scorpii a and B determined with the Sydney University Stellar Interferometer and high-resolution spectroscopy". Monthly Notices of the Royal Astronomical Society. 370 (2): 884–890. arXiv:astro-ph/0605311. Bibcode:2006MNRAS.370..884T. doi:10.1111/j.1365-2966.2006.10526.x. S2CID 13971499.
- 1 2 3 Uytterhoeven, K.; Willems, B.; Lefever, K.; Aerts, C.; Telting, J. H.; Kolb, U. (2004). "Interpretation of the variability of the β Cephei star λ Scorpii". Astronomy and Astrophysics. 427 (2): 581–592. Bibcode:2004A&A...427..581U. doi:10.1051/0004-6361:20041223. hdl:2066/60554.
- 1 2 Hamdy, M. A.; Abo Elazm, M. S.; Saad, S. M. (1993). "A catalogue of spectral classification and photometric data of B-type stars". Astrophysics and Space Science. 203 (1): 53–107. Bibcode:1993Ap&SS.203...53H. doi:10.1007/BF00659414. S2CID 122459090.
- 1 2 3 4 5 6 7 8 Handler, G.; Schwarzenberg-Czerny, A. (2013). "Time-resolved multicolour photometry of bright B-type variable stars in Scorpius". Astronomy & Astrophysics. 557: A1. arXiv:1307.2733. Bibcode:2013A&A...557A...1H. doi:10.1051/0004-6361/201321886. S2CID 56403146.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- ↑ Balona, L. A.; Feast, M. W. (1975). "The luminosities of the beta Canis Majoris variables, the zero age main sequence and the distance of the Sco-Cen association". Monthly Notices of the Royal Astronomical Society. 172 (1): 191–203. Bibcode:1975MNRAS.172..191B. doi:10.1093/mnras/172.1.191.
- 1 2 Tokovinin, Andrei (2018-03-01). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5. ISSN 0067-0049. S2CID 119047709.