Astronomy:V518 Carinae

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Short description: Blue-hued variable star in the constellation Carina
V518 Carinae
Location of V518 Carinae in IC 2602 (circled)
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas
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

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

Variability

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

V518 Carinae was discovered to change in brightness after analysis of Hipparcos photometry.[11] The amplitude of the variations seen is 0.2 magnitudes, with possible periods of 100 and 971 days.[12] It is classified as a γ Cassiopeiae variable.[13][4]

Spectral peculiarities

V518 Carinae is classified as a B-type main sequence star between B3 and B5.[14] 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.[15]

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.[16]

References

  1. ↑ 1.0 1.1 1.2 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. 
  2. ↑ 2.0 2.1 2.2 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. ↑ 4.0 4.1 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. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  5. ↑ 5.0 5.1 5.2 Silaj, J; Landstreet, J. D (2014). "Accurate age determinations of several nearby open clusters containing magnetic Ap stars". Astronomy & Astrophysics 566: A132. doi:10.1051/0004-6361/201321468. Bibcode: 2014A&A...566A.132S. 
  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. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T. 
  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. doi:10.1093/mnras/stx3075. Bibcode: 2018MNRAS.474.5287A. 
  8. ↑ 8.0 8.1 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. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D. 
  9. ↑ Gullikson, Kevin; Dodson-Robinson, Sarah (2013). "Detection of Low-Mass-ratio Stellar Binary Systems". The Astronomical Journal 145 (1): 3. doi:10.1088/0004-6256/145/1/3. Bibcode: 2013AJ....145....3G. 
  10. ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access. 
  11. ↑ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars". Information Bulletin on Variable Stars 4659. Bibcode: 1999IBVS.4659....1K. https://ibvs.konkoly.hu/pub/ibvs/4601/4659.pdf. Retrieved 11 January 2025. 
  12. ↑ 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. doi:10.1051/0004-6361/200912304. Bibcode: 2009A&A...507.1141L. 
  13. ↑ 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. 
  14. ↑ 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. 
  15. ↑ Renson, P; Manfroid, J (2009). "Catalogue of Ap, Hg Mn and Am stars". Astronomy and Astrophysics 498 (3): 961. doi:10.1051/0004-6361/200810788. Bibcode: 2009A&A...498..961R. https://zenodo.org/record/890529. 
  16. ↑ 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. doi:10.1086/597551. Bibcode: 2009PASP..121..125M. 



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