QZ Puppis

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QZ Puppis
Puppis constellation map.svg
Red circle.svg
Location of QZ Puppis (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Puppis
Right ascension 07h 52m 38.64663s [1]
Declination −38° 51′ 46.1305″ [1]
Apparent magnitude  (V)4.47 - 4.54 [2]
Characteristics
Spectral type B2.5V [3]
U−B color index −0.68 [4]
B−V color index -0.20 [4]
Variable type ellipsoidal [2]
Astrometry
Radial velocity (Rv)+29.50 [5] km/s
Proper motion (μ)RA: −8.92 [1] mas/yr
Dec.: +3.34 [1] mas/yr
Parallax (π)5.03±0.19  mas [1]
Distance 650 ± 20  ly
(199 ± 8  pc)
Absolute magnitude  (MV)−2.00 [6]
Details
Mass 6.0 [7]   M☉
Radius 7.3 [7]   R☉
Luminosity 2,268 [7]   L☉
Surface gravity (log g)3.5 [7]   cgs
Temperature 15,254 [7]   K
Metallicity [Fe/H]−0.15 [8]   dex
Rotational velocity (v sin i)151 [9]  km/s
Age 24.1 [10]   Myr
Other designations
b Puppis, QZ Pup, CD−38°3769, GC  10661, GSC  07646-03591, HIP  38455, HR  3084, HD  64503, NSV  3789, SAO  198545
Database references
SIMBAD data

QZ Puppis (QZ Pup, b Pup) is a class B2.5V (blue main-sequence) star in the constellation Puppis. Its apparent magnitude is 4.5 and it is approximately 650 light years away based on parallax.

A light curve for QZ Puppis, plotted from TESS data QZPupLightCurve.png
A light curve for QZ Puppis, plotted from TESS data

QZ Puppis was identified as a small-amplitude variable star in 1974, but the nature of the variability was unclear. It was thought to be a spectroscopic binary on the basis of variability in the radial velocity of its spectral lines. [12] As a hot B-class main sequence star with variable spectral lines, it was suspected of being a β Cephei variable but this classification was repeatedly rejected. [13] The short-period sinusoidal variations in brightness with an amplitude of 0.03 magnitudes were interpreted as ellipsoidal variations as the star, distorted by a close companion, rotates with a period of 1.1 days. [12] Later analysis of Hipparcos photometry detected shallow eclipses. [14]

The companion to QZ Puppis is only known from its effect on the visible star as they orbit. The primary shows radial velocity variations of 71 km/s as it orbits every 1.112 days.

References

  1. 1 2 3 4 5 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. 1 2 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. ↑ Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  4. 1 2 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. ↑ 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.
  6. ↑ 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
  7. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  8. ↑ Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv: 1904.11302 . Bibcode:2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765 . eISSN   1432-0746. ISSN   0004-6361.
  9. ↑ 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.
  10. ↑ 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 (1): 190–200. arXiv: 1007.4883 . Bibcode:2011MNRAS.410..190T. doi: 10.1111/j.1365-2966.2010.17434.x . S2CID   118629873. Vizier catalog entry
  11. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  12. 1 2 Haefner, R.; Drechsel, H. (1986). "Further evidence for the binary nature of HR 3084". Astrophysics and Space Science. 121 (2): 205. Bibcode:1986Ap&SS.121..205H. doi:10.1007/BF00653693. S2CID   120352239.
  13. ↑ Telting, J. H.; et al. (June 2006). "A high-resolution spectroscopy survey of β Cephei pulsations in bright stars". Astronomy and Astrophysics. 452 (3): 945–953. Bibcode:2006A&A...452..945T. doi: 10.1051/0004-6361:20054730 . hdl: 2066/36162 .
  14. ↑ "QZ Pup". International Variable Star Index. AAVSO . Retrieved 2022-10-16.
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