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Quadruple star system in the constellation Ursa Major From Wikipedia, the free encyclopedia
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.[5][6] With an estimated age of 43+15
−7 million years,[4] HD 74438 is the youngest quadruple star system known.[7] The outer orbital period of the system, estimated at around 5.7 years, is also among the shortest of quadruple systems.[4][7]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Vela |
Right ascension | 08h 41m 46.5806s[1] |
Declination | −52° 03′ 44.996″[1] |
Apparent magnitude (V) | +7.59 (8.2/8.2/9.4/9.4)[2] |
Characteristics | |
Spectral type | A2mA5-A8[3] |
Astrometry | |
Proper motion (μ) | RA: −17.745[1] mas/yr Dec.: +17.056[1] mas/yr |
Parallax (π) | 6.9075 ± 0.0755 mas[1] |
Distance | 472 ± 5 ly (145 ± 2 pc) |
Orbit[4] | |
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[4] | |
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[4] | |
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[4] | |
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 | |
Database references | |
SIMBAD | data |
The HD 74438 system was confirmed to be a gravitationally bound quadruple system in 2017 from data collected in the Gaia-ESO Survey.[5] In a paper published in 2022, HD 74438 was identified as a possible progenitor of a sub-Chandrasekhar Type Ia supernova.[4]
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