HD 152408

Last updated
HD 152408
Scorpius constellation map.svg
Red circle.svg
Location of WR 79a (circled)
Observation data
Epoch J2000        Equinox J2000
Constellation Scorpius
Right ascension 16h 54m 58.5051s [1]
Declination −41° 09′ 03.093″ [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)0.5417 ± 0.0506  mas [1]
Distance 6,000 ± 600  ly
(1,800 ± 200  pc)
Absolute magnitude  (MV)−7.1 [3]
Details
Mass 27.3 [6]   M☉
Radius 45 [6]   R☉
Luminosity (bolometric)850,000 [6]   L☉
Surface gravity (log g)3.32 [7]   cgs
Temperature 35,481 [6]   K
Age 4.8 [8]   Myr
Other designations
HD  152408, WR  79a, HR  6272, HIP  82775, SAO  227425, CD–40°10919, Trumpler 24 159 [9]
Database references
SIMBAD data
HD 152408 in Trumpler 24 is the brightest star, above centre, between the Prawn Nebula on the left and NGC 6231 on the right The Prawn Nebula in Scorpius.jpg
HD 152408 in Trumpler 24 is the brightest star, above centre, between the Prawn Nebula on the left and NGC 6231 on the right

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. [10] With an apparent magnitude of about 5.8, 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 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☉. [11]

References

  1. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  2. 1 2 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.
  3. 1 2 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.
  4. 1 2 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.
  5. ↑ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Washington, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  6. 1 2 3 4 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). Bibcode:2024RAA....24i5001M. doi:10.1088/1674-4527/ad6a39.
  7. ↑ 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. arXiv: 1808.07880 . Bibcode:2018A&A...620A..89N. doi:10.1051/0004-6361/201833453.
  8. ↑ 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.
  9. ↑ "HD 152408". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 6 February 2021.
  10. ↑ 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.
  11. ↑ 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.
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