Astronomy:V357 Carinae
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Carina |
| Right ascension | 09h 10m 58.086s[1] |
| Declination | −58° 58′ 0.82″[1] |
| Apparent magnitude (V) | +3.41 - 3.44[2] |
| Characteristics | |
| Spectral type | B2IV-V[3] |
| Variable type | Eclipsing[2] |
| Astrometry | |
| Radial velocity (Rv) | 23.3[4] km/s |
| Proper motion (μ) | RA: −16.64[1] mas/yr Dec.: 15.00 mas/yr |
| Parallax (π) | 7.30 ± 0.35[1] mas |
| Distance | 450 ± 20 ly (137 ± 7 pc) |
| Orbit[5] | |
| Period (P) | 6.74469 d |
| Eccentricity (e) | 0.18 |
| Semi-amplitude (K1) (primary) | 21.5 km/s |
| Details | |
| Aa1 | |
| Mass | 8.18[6] M☉ |
| Radius | 5.8[7] R☉ |
| Luminosity | 4,000[7] L☉ |
| Surface gravity (log g) | 4.0[8] cgs |
| Temperature | 19,150[7] K |
| Age | 18.7[9] Myr |
| Aa2 | |
| Mass | 1.10[6] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
V357 Carinae (a Car, a Carinae)[n 1] is triple star in the constellation Carina. It is approximately 419 light years from Earth. The mean apparent magnitude of the system is +3.43. Outside of brightly-lit urban areas, it is easily visible to the naked eye. The star appears 46.0' (0.7668°) distant of Iota Carinae at the heart of the asterism and constellation which is skewed in having bulk of the stars away from the eastern, Canopus prow of the ship and close to the imagined sails of the ship, Vela.
Properties
The two inner components form a single-lined spectroscopic binary with a period of 6.74 days and an eccentricity of 0.18.[5] In 1959, Sergei Illarionovich Gaposchkin announced his discovery that the star, then known as a Carinae, is a variable star.[11] It was given its variable star designation, V357 Carinae, in 1977.[12] The star's brightness varies from magnitude +3.41 to +3.44 with a period of 6.74 days, which is its orbital period. It was classified as an eclipsing binary in Gaposchkin's original catalogue of variable stars,[12] although the variability was often considered doubtful.[3] This subsystem is now thought to be a very shallow eclipsing binary.[2]
a Carinae is also an astrometric binary, meaning its motion in the sky implies orbital motion about an invisible companion. The orbital elements of the third companion are unknown, and it has not yet been detected.[6]
Notes
- ↑ Pronounced: lower-case /eɪ/ /ˈkærɪnaɪ/ or /kæˈriːnaɪ/
References
- ↑ 1.0 1.1 1.2 1.3 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.
- ↑ 2.0 2.1 2.2 Avvakumova, E. A.; Malkov, O. Yu.; Kniazev, A. Yu. (2013). "Eclipsing variables: Catalogue and classification". Astronomische Nachrichten 334 (8): 860. doi:10.1002/asna.201311942. Bibcode: 2013AN....334..860A.
- ↑ 3.0 3.1 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.
- ↑ Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and Their Applications 30: 57. Bibcode: 1967IAUS...30...57E.
- ↑ 5.0 5.1 Buscombe, W.; Morris, P. M. (1960). "The Scorpio-Centaurus Association: I. Radial Velocities of 120 Bright Stars". Monthly Notices of the Royal Astronomical Society 121 (3): 263–278. doi:10.1093/mnras/121.3.263. Bibcode: 1960MNRAS.121..263B.
- ↑ 6.0 6.1 6.2 Tokovinin, A.A.. "Multiple Star Catalog". https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJS/235/6&ID=09110-5858.
- ↑ 7.0 7.1 7.2 Cazorla, Constantin; Nazé, Yaël (2017-12-01). "B stars seen at high resolution by XMM-Newton" (in en). Astronomy & Astrophysics 608: A54. doi:10.1051/0004-6361/201731562. ISSN 0004-6361.
- ↑ Underhill, A. B. et al. (November 1979). "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars". Monthly Notices of the Royal Astronomical Society 189 (3): 601–605. doi:10.1093/mnras/189.3.601. Bibcode: 1979MNRAS.189..601U.
- ↑ 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. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T.
- ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
- ↑ Gaposchkin, Sergei (May 1959). "On γ Velorum, ɛ Carinae and a Carinae as eclipsing variables". Astronomical Journal 64: 127. doi:10.1086/107899. Bibcode: 1959AJ.....64..127G. https://articles.adsabs.harvard.edu/pdf/1959AJ.....64..127G. Retrieved 9 January 2025.
- ↑ 12.0 12.1 Kukarkin, B. V.; Kholopov, P. N.; Fedorovich, V. P.; Kireyeva, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (1977). "62nd Name-List of Variable Stars". Information Bulletin on Variable Stars 1248: 1. Bibcode: 1977IBVS.1248....1K.
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