HD 152408, also known as WR 79a, is a Wolf-Rayet star located in the constellation Scorpius, close to the galactic plane. Its distance is around 2,020 parsecs (6,500 lightyears) away from the Earth.[8]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 54m 58.5049s[1] |
| Declination | −41° 09′ 03.092″[1] |
| Apparent magnitude (V) | 5.81-5.85[2] |
| Characteristics | |
| Spectral type | WN9ha[3] |
| U−B color index | −0.8[4] |
| B−V color index | 0.017[4] |
| Variable type | WR[2] |
| Astrometry | |
| Radial velocity (Rv) | −138[5] km/s |
| Proper motion (μ) | RA: 0.47[1] mas/yr Dec.: −2.25[1] mas/yr |
| Parallax (π) | 1.44 ± 0.34 mas[1] |
| Distance | 2,020+980 −510[3] pc |
| Absolute magnitude (MV) | −7.1[3] |
| Details | |
| Mass | 24.4[6] M☉ |
| Radius | 32[7] R☉ |
| Luminosity (bolometric) | 603,000[8] L☉ |
| Temperature | 35,000[8] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 152408 lies in the north of the open cluster NGC 6231, the center of the OB association Scorpius OB1; it is not clear whether it is a part of the association or not.[10] With an apparent magnitude of about 5.77,[11] it is the third brightest Wolf-Rayet star. The other Wolf-Rayet stars that can be seen with the naked eye (although it can only be seen with the naked eye under excellent viewing conditions) are γ2 Velorum (WR 11), θ Muscae (WR 48), WR 22, WR 24 and HD 151932 (WR 78).
HD 152408 is about 24 times as massive as the Sun. Like most extremely massive stars, it is losing mass via its stellar wind. The total rate of mass loss is 2.4×10−5 M☉/yr.[8] With an effective temperature of 35,000 K, its bolometric luminosity is more than 600,000 L☉.
References
edit- ^ a b c d e 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 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
- ^ a b c Crowther, Paul A.; Rate, Gemma (2020). "Unlocking Galactic Wolf–Rayet stars with Gaia DR2 – I. Distances and absolute magnitudes". Monthly Notices of the Royal Astronomical Society. 493 (1): 1512–1529. arXiv:1912.10125. Bibcode:2020MNRAS.493.1512R. doi:10.1093/mnras/stz3614. S2CID 209444955.
- ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.
- ^ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Washington, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
- ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (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. S2CID 118629873.
- ^ Lamers, H. J. G. L. M.; Nugis, T. (November 2002). "An explanation for the curious mass loss history of massive stars: From OB stars, through Luminous Blue Variables to Wolf-Rayet stars". Astronomy & Astrophysics. 395 (1): L1–L4. arXiv:astro-ph/0210388. Bibcode:2002A&A...395L...1L. doi:10.1051/0004-6361:20021381. ISSN 0004-6361. S2CID 18826723.
- ^ a b c d Skinner, Stephen L.; Zhekov, Svetozar A.; Güdel, Manuel; Schmutz, Werner; Sokal, Kimberly R. (2012-05-01). "New X-Ray Detections of WNL Stars". The Astronomical Journal. 143 (5): 116. arXiv:1203.5098. Bibcode:2012AJ....143..116S. doi:10.1088/0004-6256/143/5/116. ISSN 0004-6256. S2CID 119281411.
- ^ "HD 152408". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 6 February 2021.
- ^ Seggewiss, W.; Moffat, A. F. (1979). "The intrinsically bright Wolf-Rayet stars of type WN 7. III - The probable single SCO OB 1 star HD 151932 with variable He I envelope". Astronomy and Astrophysics. 72 (3): 332–338. Bibcode:1979A&A....72..332S.
- ^ Heske, A.; Wendker, H. J. (1985). "Further photometry and spectroscopy in the young cluster region TR 24/Sco OB 1". Astronomy and Astrophysics. 151: 309–314. Bibcode:1985A&A...151..309H.