Lambda Pavonis

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λ Pavonis
Pavo constellation map.svg
Red circle.svg

Location of λ Pavonis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pavo
Right ascension 18h 52m 13.03427s[1]
Declination −62° 11′ 15.3324″[1]
Apparent magnitude (V) 4.00 - 4.26[2]
Spectral type B2II–IIIe[2]
U−B color index -0.88[3]
B−V color index -0.15[4]
Variable type γ Cas[2]
Radial velocity (Rv) +9.00[5] km/s
Proper motion (μ) RA: -1.86[1] mas/yr
Dec.: -13.02[1] mas/yr
Parallax (π) 2.28 ± 0.18[1] mas
Distance 1,400 ± 100 ly
(440 ± 30 pc)
Absolute magnitude (MV) -3.97[4]
Mass 12.5[6] M
Luminosity 8450[4] L
Temperature 20,300[7] K
Rotational velocity (v sin i) 190.0[8] km/s
Other designations
CCDM J18522-6212A, FK5 704, GC 25823, HIP 92609, HR 7074, HD 173948, SAO 254393, WDS J18522-6211A
Database references

Lambda Pavonis (λ Pav), also known as HD 173948 or HIP 92609, is a star in the constellation Pavo. Its apparent magnitude is 4.21. It is a Be star, a rapidly rotating hot blue star which has developed a gas disk around it. It is a member of the Scorpius-Centaurus Association.[9] It is a γ Cassiopeiae variable or shell star which has occasionally brightened to magnitude 4.0.[2]

Variations in signals coming from Lambda Pavonis have led to debate on whether it is a binary, single or pulsating variable star.[9]


  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d 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. ^ Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M. Vizier catalog entry
  4. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. Bibcode:2012AstL...38..331A. arXiv:1108.4971Freely accessible. doi:10.1134/S1063773712050015.  Vizier catalog entry
  5. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ 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: 190. Bibcode:2011MNRAS.410..190T. arXiv:1007.4883Freely accessible. doi:10.1111/j.1365-2966.2010.17434.x.  Vizier catalog entry
  7. ^ Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. Bibcode:2010AN....331..349H. arXiv:1003.2335Freely accessible. doi:10.1002/asna.200911355. 
  8. ^ Glebocki, R.; Gnacinski, P. (2005). "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005)". VizieR On-line Data Catalog: III/244. Originally published in: 2005csss...13..571G; 2005yCat.3244....0G. 3244. Bibcode:2005yCat.3244....0G.  Vizier catalog entry
  9. ^ a b R.S. Levenhagen; N. V. Leister; R. Künzel (2011). "Spectroscopic variabilities in λ Pavonis". Astronomy & Astrophysics. 533: 75–75. Bibcode:2011A&A...533A..75L. doi:10.1051/0004-6361/201116590.