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V518 Carinae

V518 Carinae
Location of V518 Carinae in IC 2602 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 10h 42m 14.12040s[1]
Declination −64° 27′ 59.1323″[1]
Apparent magnitude (V) 4.82[2]
Characteristics
Spectral type B3/5V[3]
U−B color index −0.58[2]
B−V color index −0.14[2]
Variable type γ Cas?[4]
Astrometry
Parallax (π)7.19 ± 0.20 mas[1]
Distance450 ± 10 ly
(139 ± 4 pc)
Absolute magnitude (MV)−1.169[5]
Details
Mass6.2[6] M☉
Radius3.30±0.07[7] R☉
Luminosity753[5] L☉
Surface gravity (log g)4.015[8] cgs
Temperature15,397[5] K
Rotational velocity (v sin i)120[8] km/s
Age17.2[9] Myr
Other designations
V518 Carinae, HD 92938, HIP 52370, HR 4196
Database references
SIMBADdata

V518 Carinae (HR 4196) is a naked-eye variable star in the constellation Carina. It is a member of the bright open cluster IC 2602 near the Carina Nebula.

Location

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V518 Carinae lies in the open cluster IC 2602, 5 arc minutes from its brightest member θ Carinae.

Variability

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A light curve for V518 Carinae, plotted from Hipparcos data[10]

518 Carinae was discovered to change in brightness after analysis of Hipparcos photometry. The amplitude of the variations seen is 0.2 magnitudes, with possible periods of 100 and 971 days.[11] It is classified as a γ Cassiopeiae variable.[12][4]

Spectral peculiarities

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V518 Carinae is classified as a B-type main sequence star between B3 and B5.[13] It is also catalogued as a helium star, a chemically peculiar star with abnormally strong helium absorption lines in its spectrum and relatively weak hydrogen lines. It is possibly a blue straggler.[14]

V518 Carinae is also a Be star, a hot star with emission lines in its spectrum due to a disk of material around the star. Be stars that show irregular brightness changes due to the disk are grouped as γ Cassiopeiae variables. V518 Carinae is known to produce disk outbursts lasting several hundred days.[15]

References

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  1. ^ a b c 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.
  2. ^ a b c Ducati, J. R (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ Houk, N; Cowley, A. P (1975). "University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0". University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
  4. ^ a b Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  5. ^ a b c Silaj, J; Landstreet, J. D (2014). "Accurate age determinations of several nearby open clusters containing magnetic Ap stars". Astronomy & Astrophysics. 566: A132. arXiv:1407.4531. Bibcode:2014A&A...566A.132S. doi:10.1051/0004-6361/201321468. S2CID 53370832.
  6. ^ 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.
  7. ^ Arcos, C.; et al. (March 2018). "Stellar parameters and H α line profile variability of Be stars in the BeSOS survey". Monthly Notices of the Royal Astronomical Society. 474 (4): 5287–5299. arXiv:1711.08675. Bibcode:2018MNRAS.474.5287A. doi:10.1093/mnras/stx3075. S2CID 74872624.
  8. ^ a b David, Trevor J; Hillenbrand, Lynne A (2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607.
  9. ^ Gullikson, Kevin; Dodson-Robinson, Sarah (2013). "Detection of Low-Mass-ratio Stellar Binary Systems". The Astronomical Journal. 145 (1): 3. arXiv:1210.6360. Bibcode:2013AJ....145....3G. doi:10.1088/0004-6256/145/1/3. S2CID 118517725.
  10. ^ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  11. ^ Lefèvre, L; Marchenko, S. V; Moffat, A. F. J; Acker, A (2009). "A systematic study of variability among OB-stars based on HIPPARCOS photometry". Astronomy and Astrophysics. 507 (2): 1141. Bibcode:2009A&A...507.1141L. doi:10.1051/0004-6361/200912304.
  12. ^ Adelman, S. J; Mayer, M. R; Rosidivito, M. A (2000). "On the Variability of O4-B5 Luminosity Class III-V Stars". Information Bulletin on Variable Stars. 5008: 1. Bibcode:2000IBVS.5008....1A.
  13. ^ Skiff, B. A (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)". VizieR On-line Data Catalog: B/Mk. Originally Published in: Lowell Observatory (October 2014). 1. Bibcode:2014yCat....1.2023S.
  14. ^ Renson, P; Manfroid, J (2009). "Catalogue of Ap, Hg Mn and Am stars". Astronomy and Astrophysics. 498 (3): 961. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788.
  15. ^ Mennickent, R. E; Sabogal, B; Granada, A; Cidale, L (2009). "L-Band Spectra of 13 Outbursting Be Stars". Publications of the Astronomical Society of the Pacific. 121 (876): 125. arXiv:0902.4279. Bibcode:2009PASP..121..125M. doi:10.1086/597551. S2CID 119286005.