HD 74438

HD 74438
Observation data
Epoch J2000      Equinox ICRS
Constellation Vela
Right ascension 08h 41m 46.5806s
Declination −52° 03′ 44.996″
Apparent magnitude (V) +7.59[citation needed] (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
Distance472 ± 5 ly
(145 ± 2 pc)
Absolute magnitude (MV)+3.23
Orbit
PrimaryAB
SecondaryCD
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
PrimaryA
SecondaryB
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
PrimaryC
SecondaryD
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
Mass1.70±0.06 M☉
Radius1.46±0.15 R☉
Luminosity8.87±1.40 L☉
Temperature8,250±250 K
B
Mass1.54±0.06 M☉
Radius1.42±0.15 R☉
Luminosity5.72±0.95 L☉
Temperature7,500±250 K
C
Mass0.96±0.14 M☉
Radius0.84±0.36 R☉
Luminosity0.64±0.51 L☉
Temperature5,625±410 K
D
Mass0.87±0.14 M☉
Radius0.80±0.29 R☉
Luminosity0.48±0.32 L☉
Temperature5,375±410 K
Other designations
HD 74438, CD−52°2497, SAO 236190
Database references
SIMBADdata

HD 74438 is a spectroscopic quadruple stellar system composed of a pair of double star systems approximately 425 light years from Earth, located in the 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

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  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. ↑ 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.
  4. ↑ 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.
  5. ↑ Perry, C. L.; Christodoulou, D. M. (1996). "Interstellar Reddening in the Southern Hemisphere. II. Analysis of the uvby-Beta Observations". Publications of the Astronomical Society of the Pacific. 108: 772. Bibcode:1996PASP..108..772P. doi:10.1086/133800.
  6. 1 2 3 4 5 6 7 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.
  7. 1 2 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.
  8. ↑ 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.
  9. 1 2 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.