| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Vela |
| Right ascension | 08 41 46.5806 |
| Declination | −52° 03′ 44.996″ |
| Apparent magnitude (V) | +7.59 (8.2/8.2/9.4/9.4) |
| Characteristics | |
| Spectral type | A2mA5-A8 |
| Astrometry | |
| Proper motion (μ) | RA: −17.745 mas/yr Dec.: +17.056 mas/yr |
| Parallax (π) | 6.9075 ± 0.0755 mas |
| Distance | 472 ± 5 ly (145 ± 2 pc) |
| Orbit | |
| Primary | AB |
| Companion | CD |
| Period (P) | 2,074.2±3.5 days |
| Semi-major axis (a) | 5.54±0.04 au |
| Eccentricity (e) | 0.458±0.015 |
| Inclination (i) | 73.2 or 106.8° |
| Semi-amplitude (K1) (primary) | 12.8±0.3 km/s |
| Semi-amplitude (K2) (secondary) | 18.5±0.4 km/s |
| Orbit | |
| Primary | A |
| Companion | B |
| Period (P) | 20.5729±0.0003 days |
| Semi-major axis (a) | 0.215±0.002 au |
| Eccentricity (e) | 0.3692±0.0001 |
| Inclination (i) | 52.5 or 127.5° |
| Semi-amplitude (K1) (primary) | 45.81±0.09 km/s |
| Semi-amplitude (K2) (secondary) | 50.77±0.09 km/s |
| Orbit | |
| Primary | C |
| Companion | D |
| Period (P) | 4.4243±0.0001 days |
| Semi-major axis (a) | 0.0681±0.001 au |
| Eccentricity (e) | 0.1535±0.0003 |
| Inclination (i) | 84.0 or 96.0° |
| Semi-amplitude (K1) (primary) | 45.81±0.09 km/s |
| Semi-amplitude (K2) (secondary) | 50.77±0.09 km/s |
| Details | |
| A | |
| Mass | 1.70±0.06 M☉ |
| Radius | 1.46±0.15 R☉ |
| Luminosity | 8.87±1.40 L☉ |
| Temperature | 8,250±250 K |
| B | |
| Mass | 1.54±0.06 M☉ |
| Radius | 1.42±0.15 R☉ |
| Luminosity | 5.72±0.95 L☉ |
| Temperature | 7,500±250 K |
| C | |
| Mass | 0.96±0.14 M☉ |
| Radius | 0.84±0.36 R☉ |
| Luminosity | 0.64±0.51 L☉ |
| Temperature | 5,625±410 K |
| D | |
| Mass | 0.87±0.14 M☉ |
| Radius | 0.80±0.29 R☉ |
| Luminosity | 0.48±0.32 L☉ |
| Temperature | 5,375±410 K |
| Other designations | |
| HD 74438, CD−52°2497, SAO 236190 | |
| Database references | |
| SIMBAD | data |
HD 74438 is a spectroscopic quadruple stellar system composed of a pair of double star systems approximately 425 light years from Earth, located in open cluster IC 2391. With an estimated age of 43+15
−7 million years, HD 74438 is the youngest quadruple star system known. The outer orbital period of the system, estimated at around 5.7 years, is also among the shortest of quadruple systems.
The HD 74438 system was confirmed to be a gravitationally bound quadruple system in 2017 from data collected in the Gaia-ESO Survey. In a paper published in 2022, HD 74438 was identified as a possible progenitor of a sub-Chandrasekhar Type Ia supernova.
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- Tokovinin, Andrei (2018-03-01). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5. ISSN 0067-0049. S2CID 119047709.
- Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 2. Ann Arbor: Dept. Of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
- ^ Merle, Thibault; Hamers, Adrian S.; Van Eck, Sophie; Jorissen, Alain; Van der Swaelmen, Mathieu; Pollard, Karen; Smiljanic, Rodolfo; Pourbaix, Dimitri; Zwitter, Tomaž; Traven, Gregor; Gilmore, Gerry; Randich, Sofia; Gonneau, Anaïs; Hourihane, Anna; Sacco, Germano; Worley, C. Clare (12 May 2022). "A spectroscopic quadruple as a possible progenitor of sub-Chandrasekhar type Ia supernovae". Nature Astronomy. 6 (6): 681–688. arXiv:2205.05045. Bibcode:2022NatAs...6..681M. doi:10.1038/s41550-022-01664-5. S2CID 248665714.
- ^ Merle, T.; Van Eck, S.; Jorissen, A.; et al. (2017). "The Gaia-ESO Survey: double-, triple-, and quadruple-line spectroscopic binary candidates". Astronomy & Astrophysics. 608 (A95): A95. arXiv:1707.01720. Bibcode:2017A&A...608A..95M. doi:10.1051/0004-6361/201730442. S2CID 119502806.
- Platais, I.; Melo, C.; Mermilliod, J.-C.; Kozhurina-Platais, V.; Fulbright, J. P.; Méndez, R. A.; Altmann, M.; Sperauskas, J. (January 2007). "WIYN open cluster study: XXVI. Improved kinematic membership and spectroscopy of IC 2391". Astronomy & Astrophysics. 461 (2): 509–522. arXiv:astro-ph/0611584. Bibcode:2007A&A...461..509P. doi:10.1051/0004-6361:20065756. S2CID 17173564.
- ^ Plait, Phil (26 May 2022). "A weird four-star system may lead the way to catastrophic supernovae". SYFY Official Site. Archived from the original on 27 May 2022. Retrieved 4 June 2022.
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