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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.
| 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][a] R☉ |
| Luminosity | 30,600[7] L☉ |
| Temperature | 3,171[7] K |
| Other designations | |
V538 Carinae, HD 98658, HIP 55355 | |
| Database references | |
| SIMBAD | data |
Properties edit
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][a] 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 edit
- ^ a b Applying the Stefan-Boltzmann Law with a nominal solar effective temperature of 5,772 K:
References edit
- ^ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
- ^ a b c d e 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.
- ^ a b c 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.
- ^ 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.
- ^ 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.
- ^ a b 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.
- ^ a b c d e f 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.
- ^ a b 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.