Astronomy:QZ Puppis

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Short description: Star in the constellation Puppis
QZ Puppis
Puppis constellation map.svg
Red circle.svg
Location of QZ Puppis (circled)
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas
Distance650 ± 20 ly
(199 ± 8 pc)
Absolute magnitude (MV)−2.00[6]
Details
Mass6.0[7] M☉
Radius7.3[7] R☉
Luminosity2,268[7] L☉
Surface gravity (log g)3.5[7] cgs
Temperature15,254[7] K
Metallicity [Fe/H]−0.15[8] dex
Rotational velocity (v sin i)151[9] km/s
Age24.1[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
SIMBADdata

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[11]

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. ↑ 1.0 1.1 1.2 1.3 1.4 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.  Vizier catalog entry
  2. ↑ 2.0 2.1 Samus, N. N. 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. ↑ 4.0 4.1 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. doi:10.1002/asna.200710776. Bibcode: 2007AN....328..889K. 
  6. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.  Vizier catalog entry
  7. ↑ 7.0 7.1 7.2 7.3 7.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  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. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  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. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T.  Vizier catalog entry
  11. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  12. ↑ 12.0 12.1 Haefner, R.; Drechsel, H. (1986). "Further evidence for the binary nature of HR 3084". Astrophysics and Space Science 121 (2): 205. doi:10.1007/BF00653693. Bibcode: 1986Ap&SS.121..205H. 
  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. doi:10.1051/0004-6361:20054730. Bibcode: 2006A&A...452..945T. 
  14. ↑ "QZ Pup". AAVSO. https://www.aavso.org/vsx/index.php?view=detail.top&oid=26936. 



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