3 Puppis

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3 Puppis
Puppis constellation map.svg
Red circle.svg

Location of 3 Puppis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension 07h 43m 48.46872s[1]
Declination −28° 57′ 17.3720″[1]
Apparent magnitude (V) 3.93[2]
Spectral type A2.7Ib[2] (A2Ia - A3IIpe[3])
Apparent magnitude (K) 2.340[4]
U−B color index −0.09[5]
B−V color index +0.18[5]
Radial velocity (Rv) 20.90±0.4[6] km/s
Proper motion (μ) RA: -5.09±0.11[1] mas/yr
Dec.: 3.90±0.15[1] mas/yr
Parallax (π) 0.59 ± 0.17[1] mas
Distance 1,700[4] pc
Absolute magnitude (MV) −5.5[2]
Mass 31-39 M
Radius 55[3] R
Luminosity 63,000 - 160,000 L
Surface gravity (log g) 2.0[3] cgs
Temperature 8,500 - 9,500 K
Other designations
l Puppis, GSC 06552-03228, HD 62623, HIP 37677, HR 2996, SAO 174400, CD−28°4774
Database references

3 Puppis (3 Pup) is a supergiant star in the constellation Puppis. It is a very rare A[e] supergiant, sometimes referred to as a B[e] star despite its spectral classification, and its apparent magnitude is 3.93.

3 Puppis is surrounded by a disc of circumstellar dust, which is unusual for an A-type star. It is thought to be caused by a low mass companion. The companion is calculated to be a B8III - B6V star with a mass of 5 M, and its orbit has a semi major axis of 2.3 AU. Like most B[e] stars, 3 Pup rotates rapidly, at 30% - 60% of the speed at which it would start to break apart. The disc has its inner edge only 3.8 AU from the primary star and it is suspected that deceleration of the hot primary stellar wind by the companion allows the dust to form unusually close to such a luminous star.[3]


  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752free to read. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Klochkova, V. G.; Sendzikas, E. G.; Chentsov, E. L. (2015). "Spectral atlas of A-type supergiants". Astrophysical Bulletin. 70: 99. arXiv:1502.01444free to read. Bibcode:2015AstBu..70...99K. doi:10.1134/S1990341315010113. 
  3. ^ a b c d Meilland, A.; Kanaan, S.; Borges Fernandes, M.; Chesneau, O.; Millour, F.; Stee, Ph.; Lopez, B. (2010). "Resolving the dusty circumstellar environment of the A[e] supergiant HD 62623 with the VLTI/MIDI". Astronomy and Astrophysics. 512: A73. arXiv:0912.1954free to read. Bibcode:2010A&A...512A..73M. doi:10.1051/0004-6361/200913640. 
  4. ^ a b c Kraus, M.; Oksala, M. E.; Cidale, L. S.; Arias, M. L.; Torres, A. F.; Borges Fernandes, M. (2015). "Discovery of SiO Band Emission from Galactic B[e] Supergiants". The Astrophysical Journal Letters. 800 (2): L20. arXiv:1501.07063free to read. Bibcode:2015ApJ...800L..20K. doi:10.1088/2041-8205/800/2/L20. 
  5. ^ a b Gutierrez-Moreno, A.; Moreno, H.; Loyola, P.; Cortes, G. (1986). "Low dispersion spectrophotometry of bright early-type stars". Astronomy and Astrophysics Supplement Series. 64: 205. Bibcode:1986A&AS...64..205G. 
  6. ^ 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.