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

Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
3 Puppis
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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]
Characteristics
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]
Astrometry
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 mas[1]
Distance5,540±1,630 ly
(1,700±500 pc)[4]
Absolute magnitude (MV)5.5[2]
Details[4]
Mass31–39 M
Radius55±10[3] (or 116–147[lower-alpha 1]) R
Luminosity63,000 - 160,000 L
Surface gravity (log g)2.0[3] cgs
Temperature8,500 - 9,500 K
Other designations
l Puppis, GSC 06552-03228, HD 62623, HIP 37677, HR 2996, SAO 174400, CD28°4774
Database references
SIMBADdata
Close

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]

Notes

  1. Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
    .

References

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