PU Puppis

PU Puppis (PU Pup) is a class B8III[3] (blue giant) star in the constellation Puppis. Its apparent magnitude is 4.69[2] and it is approximately 620 light years away based on parallax.[1]

A light curve for PU Puppis, plotted from TESS data[9]
This article is about m Puppis. It is not to be confused with M Puppis.
PU Puppis
Location of PU Puppis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension 07h 38m 18.04541s[1]
Declination −25° 21′ 53.3017″[1]
Apparent magnitude (V) 4.69[2]
Characteristics
Spectral type B8III[3]
U−B color index −0.35[4]
B−V color index −0.11[4]
Variable type β Lyr[5]
Astrometry
Radial velocity (Rv)+41.00[6] km/s
Proper motion (μ) RA: −3.03[1] mas/yr
Dec.: −7.42[1] mas/yr
Parallax (π)5.27 ± 0.26 mas[1]
Distance620 ± 30 ly
(190 ± 9 pc)
Absolute magnitude (MV)−1.80 ± 0.25
(−1.77 + 5.85)[7]
Absolute bolometric
magnitude (Mbol)		−2.35 + 5.54[7]
Orbit[7]
Period (P)2.58237 ± 0.00005 d
Semi-major axis (a)13.30 ± 0.40 R☉
Inclination (i)56.2°
Details[7]
PU Pup A
Mass4.10 ± 0.20 M☉
Radius6.60 ± 0.30 R☉
Luminosity695 ± 80 L☉
Surface gravity (log g)3.40 ± 0.05 cgs
Temperature11500 ± 500 K
Rotational velocity (v sin i)123[8] km/s
PU Pup B
Mass0.65 ± 0.05 M☉
Radius0.90 ± 0.10 R☉
Luminosity0.50 ± 0.10 L☉
Surface gravity (log g)4.30 ± 0.10 cgs
Temperature5000 ± 350 K
Other designations
m Puppis, PU Pup, CD-25°4828, CCDM J07383-2522AB, GC 10266, HIP 37173, HR 2944, HD 61429, SAO 174175, WDS J07383-2522AB
Database references
SIMBADdata

It is a β Lyrae variable, ranging from 4.75 to 4.69 magnitude with a period of 2.58 days.[5] The secondary is estimated at about 5.6 magnitude, although recent observations have failed to confirm it.[10][11] The primary has a mass of 4.10 solar masses, and is radiating at an effective temperature of 11,500 K. The secondary, with a mass 65% that of the Sun, has a surface temperature of about 5,000 K.[7]

References
  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. Vizier catalog entry
  2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
  3. Garrison, R. F.; Gray, R. O. (1994). "The late B-type stars: Refined MK classification, confrontation with stromgren photometry, and the effects of rotation". The Astronomical Journal. 107: 1556. Bibcode:1994AJ....107.1556G. doi:10.1086/116967.
  4. 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
  5. 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.
  6. Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.
  7. Erdem, Ahmet; Sürgit, Derya; Banks, Timothy S.; Özkardeş, Burcu; Budding, Edwin (2021). "Absolute parameters of young stars: PU Pup". Research in Astronomy and Astrophysics. 21 (10): 256. arXiv:2107.04650. Bibcode:2021RAA....21..256E. doi:10.1088/1674-4527/21/10/256. S2CID 235795134.
  8. Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID 55586789. Vizier catalog entry
  9. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  10. Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry
  11. Tokovinin, Andrei; Mason, Brian D.; Hartkopf, William I. (2014). "Speckle Interferometry at Soar in 2012 and 2013". The Astronomical Journal. 147 (5): 123. arXiv:1403.4970. Bibcode:2014AJ....147..123T. doi:10.1088/0004-6256/147/5/123. S2CID 118489659.
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