WZ Columbae

WZ Columbae, also known as HD 38170, is a solitary,[19] bluish-white hued star located in the southern constellation Columba, the dove. It has an apparent magnitude of 5.28,[3] allowing it to be faintly visible to the naked eye. Based on parallax measurements from the Gaia spacecraft, the object is about 365 light years distant.[2] It appears to be receding from the Solar System, having a heliocentric radial velocity of 36.3 km/s.[9]

WZ Columbae

A light curve for WZ Columbae, plotted from TESS data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 05h 42m 15.19447s[2]
Declination −34° 40′ 04.1399″[2]
Apparent magnitude (V) 5.28±0.01[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type B9/9.5 V[5]
B−V color index −0.05[6]
Variable type SPB[7] or α2 CVn[8]
Astrometry
Radial velocity (Rv)36.3±0.6[9] km/s
Proper motion (μ) RA: +5.081 mas/yr[2]
Dec.: +51.365 mas/yr[2]
Parallax (π)8.929 ± 0.08896 mas[2]
Distance365 ± 4 ly
(112 ± 1 pc)
Absolute magnitude (MV)−0.3[10]
Details
Mass3.07±0.05[4] M☉
Radius3.47[11] R☉
Luminosity124[12] L☉
Surface gravity (log g)3.79±0.07[13] cgs
Temperature10,000+256
−250[4] K
Metallicity [Fe/H]+0.51[14] dex
Rotational velocity (v sin i)65±5[15] km/s
Age394+10
−17[16] Myr
Other designations
42 G. Columbae[17], WZ Col, CD−34°2401, CPD−34°711, GC 7150, HD 38170, HIP 26868, HR 1973, SAO 196098[18]
Database references
SIMBADdata

WZ Columbae was originally listed as a slowly pulsating B-type star by the General Catalogue of Variable Stars. However, observations from Hempel & Howlger (2003) reveal it to be overabundant in strontium and barium.[14] Combined with Hipparcos photometry, this led to the object being reclassified as an Alpha2 Canum Venaticorum variable.[8] Based on data collected in the Hipparcos passband, it fluctuates between magnitudes 5.27 and 5.29 over 1.38 days.[7][20] However, TESS data suggests a period of 2.76618±0.00004 days; double that of the earlier data.[16]

The stellar classification of WZ Columbae is B9/9.5 V[5] — a main-sequence star with the characteristics of a B9 and B9.5 star. It has 3.07[4] times the mass of the Sun and is estimated to be 394 million years old,[16] having completed 89.2% of its main sequence lifetime.[4] It has a slightly enlarged radius of 3.47 R☉[11] and an effective temperature of 10,000 K.[4] This yields a luminosity 124 times that of the Sun[12] from its photosphere. Like most chemically peculiar stars, WZ Columbae has a relatively slow projected rotational velocity at 65 km/s.[15]

References
  1. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 15 September 2022.
  2. 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.
  3. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  4. Zorec, J.; Royer, F. (January 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. eISSN 1432-0746. ISSN 0004-6361.
  5. Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars III: Declinations −40° to −26°. Bibcode:1982mcts.book.....H.
  6. Stoy, R. H. (1968). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 27: 119. Bibcode:1968MNSSA..27..119S. ISSN 0024-8266.
  7. Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. eISSN 1562-6881. ISSN 1063-7729. S2CID 125853869.
  8. Dubath, P.; Rimoldini, L.; Süveges, M.; Blomme, J.; López, M.; Sarro, L. M.; De Ridder, J.; Cuypers, J.; Guy, L.; Lecoeur, I.; Nienartowicz, K.; Jan, A.; Beck, M.; Mowlavi, N.; De Cat, P.; Lebzelter, T.; Eyer, L. (9 May 2011). "Random forest automated supervised classification of Hipparcos periodic variable stars". Monthly Notices of the Royal Astronomical Society. 414 (3): 2602–2617. arXiv:1101.2406. Bibcode:2011MNRAS.414.2602D. doi:10.1111/j.1365-2966.2011.18575.x. ISSN 0035-8711.
  9. Gontcharov, G. A. (November 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
  10. Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
  11. Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
  12. McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. eISSN 1365-2966. ISSN 0035-8711.
  13. Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881.
  14. Hempel, M.; Holweger, H. (September 2003). "Abundance analysis of late B stars". Astronomy & Astrophysics. 408 (3): 1065–1076. Bibcode:2003A&A...408.1065H. doi:10.1051/0004-6361:20030889. eISSN 1432-0746. ISSN 0004-6361.
  15. Royer, F.; Gerbaldi, M.; Faraggiana, R.; Gómez, A. E. (January 2002). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 381 (1): 105–121. arXiv:astro-ph/0110490. Bibcode:2002A&A...381..105R. doi:10.1051/0004-6361:20011422. eISSN 1432-0746. ISSN 0004-6361.
  16. David-Uraz, A; Shultz, M E; Petit, V; Bowman, D M; Erba, C; Fine, R A; Neiner, C; Pablo, H; Sikora, J; ud-Doula, A; Wade, G A (1 April 2021). "MOBSTER – IV. Detection of a new magnetic B-type star from follow-up spectropolarimetric observations of photometrically selected candidates★". Monthly Notices of the Royal Astronomical Society. 504 (4): 4841–4849. arXiv:2004.09698. Bibcode:2021MNRAS.504.4841D. doi:10.1093/mnras/stab899. eISSN 1365-2966. ISSN 0035-8711.
  17. Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  18. "WZ Columbae". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 7, 2022.
  19. Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711.
  20. "WZ Col". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 2022-09-16.
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