V538 Carinae

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V538 Carinae
V538CarLightCurve.png
A light curve for V538 Carinae, plotted from Hipparcos data [1]
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Carina
Right ascension 11h 20m 06.2293s [2]
Declination −65° 15′ 07.139″ [2]
Apparent magnitude  (V)7.7 - 9.2 [3]
Characteristics
Evolutionary stage Red supergiant or AGB
Spectral type M3 II [4] or M3.8 Ib [5]
Variable type SRb [3]
Astrometry
Radial velocity (Rv)−1.85±0.93 [2]  km/s
Proper motion (μ)RA: −6.392 [2]   mas/yr
Dec.: 0.807 [2]   mas/yr
Parallax (π)0.215 ± 0.03  mas [6]
Distance 14,600+2,200
−1,800  ly
(4,486+667
−548  pc) [6]
Details
Radius 580 [7] [lower-alpha 1]   R☉
Luminosity 30,600 [7]   L☉
Temperature 3,171 [7]   K
Other designations
V538 Carinae, HD 98658, HIP 55355
Database references
SIMBAD data

V538 Carinae is a variable star in the constellation of Carina, and a possible red supergiant. It is located around 15,000 light-years from Earth. The negative radial velocity of -1.85 km/s show that it is slowly moving towards Earth.

Contents

Properties

V538 Carinae has a measured angular diameter of 3.4  mas . [8] Its distance is uncertain. At the Hipparcos distance of 1.33±1.08  kpc , this corresponds to a radius of 486 R☉, [7] but at the distance implied by its Gaia Data Release 2 parallax, the radius would be around 1,900 R☉. [8] Calculations based on the Gaia DR2 parallax with temperatures and bolometric corrections inferred from Gaia colours give an even larger radius above 2,200 R☉. [9] However, the DR2 parallax has an excess of astrometric noise larger than the parallax itself, rated at 28.7 [10] where anything above 2 is probably significant, hence affecting the distance and radius measurements. [11]

A Hipparcos distance of 1333 parsecs, together with a luminosity of 30,600  L☉ and a low effective temperature of 3,171 K would correspond to a radius of 580  R☉. [7] [lower-alpha 1] However, the distance has a very high uncertainty of 80%, hence affective the luminosity estimate. [7]

Some studies suggest that this star is a luminous AGB star and a long-period variable, instead of a supergiant. [12] It is classified in the General Catalogue of Variable Stars as a semiregular variable star of type SRb, indicating a cool pulsating giant star, with a possible period of 655 days. Its brightness varies between extremes of magnitude 7.7 and 9.2. [3]

Notes

  1. 1 2 Applying the Stefan-Boltzmann Law with a nominal solar effective temperature of 5,772  K:

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References

  1. ↑ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  2. 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.
  3. 1 2 3 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: B/gcvs. Bibcode:2009yCat....102025S.
  4. ↑ Pickles, A.; Depagne, É. (2010). "All-Sky Spectrally Matched UBVRI - ZY and u′ g′ r′ i′ z′ Magnitudes for Stars in the Tycho2 Catalog". Publications of the Astronomical Society of the Pacific. 122 (898): 1437. arXiv: 1011.2020 . Bibcode:2010PASP..122.1437P. doi:10.1086/657947. S2CID   54678796.
  5. ↑ 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.
  6. 1 2 Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021-03-01). "Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3". The Astronomical Journal. 161 (3): 147. arXiv: 2012.05220 . Bibcode:2021AJ....161..147B. doi: 10.3847/1538-3881/abd806 . ISSN   0004-6256. Data about this star can be seen here.
  7. 1 2 3 4 5 6 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv: 1208.2037 . Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID   118665352.
  8. 1 2 Cruzalèbes, P.; Petrov, R. G.; Robbe-Dubois, S.; Varga, J.; Burtscher, L.; Allouche, F.; Berio, P.; Hofmann, K. H.; Hron, J.; Jaffe, W.; Lagarde, S.; Lopez, B.; Matter, A.; Meilland, A.; Meisenheimer, K.; Millour, F.; Schertl, D. (2019). "A catalogue of stellar diameters and fluxes for mid-infrared interferometry". Monthly Notices of the Royal Astronomical Society. 490 (3): 3158–3176. arXiv: 1910.00542 . Bibcode:2019MNRAS.490.3158C. doi:10.1093/mnras/stz2803. S2CID   203610229.
  9. ↑ Stassun, Keivan G.; Oelkers, Ryan J.; Paegert, Martin; Torres, Guillermo; Pepper, Joshua; Lee, Nathan De; Collins, Kevin; Latham, David W.; Muirhead, Philip S.; Chittidi, Jay; Rojas-Ayala, Bárbara (2019-09-09). "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 . hdl: 1721.1/124721 . ISSN   1538-3881. S2CID   166227927.
  10. ↑ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR .
  11. ↑ Lindegren, L.; Klioner, S. A.; Hernández, J.; Bombrun, A.; Ramos-Lerate, M.; Steidelmüller, H.; Bastian, U.; Biermann, M.; de Torres, A.; Gerlach, E.; Geyer, R.; Hilger, T.; Hobbs, D.; Lammers, U.; McMillan, P. J. (2021-05-01). "Gaia Early Data Release 3. The astrometric solution". Astronomy and Astrophysics. 649: A2. doi:10.1051/0004-6361/202039709. ISSN   0004-6361.
  12. ↑ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 .
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