Astronomy:V538 Carinae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Carina |
| Right ascension | 11h 20m 06.2287s[2] |
| Declination | −65° 15′ 07.134″[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 | |
| Proper motion (μ) | RA: −6.197[2] mas/yr Dec.: 0.522[2] mas/yr |
| Parallax (π) | 0.1665 ± 0.0546[2] mas |
| Distance | approx. 20,000 ly (approx. 6,000 pc) |
| Details | |
| Radius | 580[6][lower-alpha 1] - 2,264?[7] R☉ |
| Luminosity | 30,600[6] L☉ |
| Temperature | 3,302[2] 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. If this star replaced the Sun in the Solar System, its photosphere would at least engulf the orbit of Mars.
Properties
V538 Carinae has a measured angular diameter of 3.4 mas.[8] Its distance is uncertain. At the Hipparcos distance of 1.33+5.81
−0.59 kpc, this corresponds to a radius of 580 R☉,[6] 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☉.[7]
Some studies suggest that this star is a luminous AGB star and a long-period variable, instead of a supergiant.[9] 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
- ↑ Applying the Stefan-Boltzmann Law with a nominal solar effective temperature of 5,772 K:
- [math]\displaystyle{ \sqrt{\left(\frac{5772}{3171}\right)^4\cdot 30,595.30}\approx579.55 \ R_\odot }[/math]
References
- ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 Samus, N. N. 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. doi:10.1086/657947. Bibcode: 2010PASP..122.1437P.
- ↑ 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.
- ↑ 6.0 6.1 6.2 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. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode: 2012MNRAS.427..343M.
- ↑ 7.0 7.1 Stassun, Keivan G.; Oelkers, Ryan J.; Paegert, Martin; Torres, Guillermo; Pepper, Joshua; Lee, Nathan De; Collins, Kevin; Latham, David W. et al. (2019-09-09). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 1538-3881. Bibcode: 2019AJ....158..138S.
- ↑ 8.0 8.1 Cruzalèbes, P.; Petrov, R. G.; Robbe-Dubois, S.; Varga, J.; Burtscher, L.; Allouche, F.; Berio, P.; Hofmann, K. H. et al. (2019). "A catalogue of stellar diameters and fluxes for mid-infrared interferometry". Monthly Notices of the Royal Astronomical Society 490 (3): 3158–3176. doi:10.1093/mnras/stz2803. Bibcode: 2019MNRAS.490.3158C.
- ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
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