3 Puppis

3 Puppis
	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]
Distance	1,700[4] pc
Absolute magnitude (MV)	−5.5[2]
Details[4]
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
SIMBAD	data

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.

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]

References

Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
Klochkova, V. G.; Sendzikas, E. G.; Chentsov, E. L. (2015). "Spectral atlas of A-type supergiants". Astrophysical Bulletin. 70 (1): 99–108. arXiv:1502.01444. Bibcode:2015AstBu..70...99K. doi:10.1134/S1990341315010113. S2CID 119229144.
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:0912.1954. Bibcode:2010A&A...512A..73M. doi:10.1051/0004-6361/200913640. S2CID 119225591.
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:1501.07063. Bibcode:2015ApJ...800L..20K. doi:10.1088/2041-8205/800/2/L20. S2CID 118847782.
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.
Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.

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[hipparcos-1] Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.

[klochkova-2] Klochkova, V. G.; Sendzikas, E. G.; Chentsov, E. L. (2015). "Spectral atlas of A-type supergiants". Astrophysical Bulletin. 70 (1): 99–108. arXiv:1502.01444. Bibcode:2015AstBu..70...99K. doi:10.1134/S1990341315010113. S2CID 119229144.

[meilland-3] 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:0912.1954. Bibcode:2010A&A...512A..73M. doi:10.1051/0004-6361/200913640. S2CID 119225591.

[kraus-4] 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:1501.07063. Bibcode:2015ApJ...800L..20K. doi:10.1088/2041-8205/800/2/L20. S2CID 118847782.

[gm-5] 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): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.