Astronomy:HD 152408

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Short description: Star in the constellation of Scorpius
HD 152408
Location of WR 79a (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Scorpius[1]
Right ascension  16h 54m 58.5051s[2]
Declination −41° 09′ 03.093″[2]
Apparent magnitude (V) 5.81 – 5.85[3]
Characteristics
Spectral type WN9ha[4]
U−B color index −0.8[5]
B−V color index 0.017[5]
Variable type WR[3]
Astrometry
Radial velocity (Rv)−138[6] km/s
Proper motion (μ) RA: +0.47[2] mas/yr
Dec.: −2.25[2] mas/yr
Parallax (π)0.5417 ± 0.0506[2] mas
Distance6,000 ± 600 ly
(1,800 ± 200 pc)
Absolute magnitude (MV)−7.1[4]
Details
Mass27.3[7] M☉
Radius45[7] R☉
Luminosity (bolometric)850,000[7] L☉
Surface gravity (log g)3.32[8] cgs
Temperature35,481[7] K
Age4.8[9] Myr
Other designations
HD 152408, WR 79a, HR 6272, HIP 82775, SAO 227425, CD−40°10919, Trumpler 24 159[10]
Database references
SIMBADdata
HD 152408 in Trumpler 24 is the brightest star, above centre, between the Prawn Nebula on the left and NGC 6231 on the right. North is to the left.

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 1,800 parsecs (6,000 light-years) away from the Earth.

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.[11] With an apparent magnitude of about 5.8, it is the third brightest Wolf-Rayet star and it can only be seen with the naked eye under excellent viewing conditions. The other Wolf-Rayet stars that can be seen with the naked eye are γ2 Velorum (WR 11), θ Muscae (WR 48), WR 22, WR 24 and HD 151932 (WR 78).

HD 152408 is over 20 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. With an effective temperature of 35,000 K, its bolometric luminosity is more than 600,000 L☉.[12]

References

  1. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 Samus, N. N. 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. 
  4. ↑ 4.0 4.1 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. doi:10.1093/mnras/stz3614. Bibcode: 2020MNRAS.493.1512R. 
  5. ↑ 5.0 5.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27. doi:10.1888/0333750888/2862. Bibcode: 2000A&A...355L..27H. 
  6. ↑ Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Washington (Washington: Carnegie Institution of Washington). Bibcode: 1953GCRV..C......0W. 
  7. ↑ 7.0 7.1 7.2 7.3 Malasan, Hakim Luthfi; Setyo Budi, Bakuh Danang (2024). "Spectroscopic Observations of Ten Galactic Wolf–Rayet Stars at Bosscha Observatory: Determination of Stellar Parameters and Mass-loss Rates". Research in Astronomy and Astrophysics 24 (9). doi:10.1088/1674-4527/ad6a39. Bibcode: 2024RAA....24i5001M. 
  8. ↑ Nebot Gómez-Morán, A.; Oskinova, L. M. (2018). "The X-ray catalog of spectroscopically identified Galactic O stars. Investigating the dependence of X-ray luminosity on stellar and wind parameters". Astronomy and Astrophysics 620. doi:10.1051/0004-6361/201833453. Bibcode: 2018A&A...620A..89N. 
  9. ↑ 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. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T. 
  10. ↑ "HD 152408". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+152408. 
  11. ↑ 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. 
  12. ↑ 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. doi:10.1088/0004-6256/143/5/116. ISSN 0004-6256. Bibcode: 2012AJ....143..116S. 



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