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AB Aurigae is a young Herbig Ae star [3] in the Auriga constellation. It is located at a distance of approximately 509 light years from the Sun based on stellar parallax . [ 1 ] This pre-main-sequence star has a stellar classification of A0Ve, [ 4 ] matching an A-type main-sequence star with emission lines in the spectrum .
Capella Aa is the cooler and more luminous of the two with spectral class K0III; it is 78.7 ± 4.2 times the Sun's luminosity and 11.98 ± 0.57 times its radius. An aging red clump star, it is fusing helium to carbon and oxygen in its core.
R Aurigae has an apparent visual magnitude which varies between 6.7 and 13.9 with a period of 450 days. [3] The light curve varies strongly from cycle to cycle, sometimes having a pronounced hump on the ascending branch and usually having rise and fall times approximately equal. The cycle period has oscillated slowly between about 450 and 465 days.
It is over 190,000 times more luminous, around 20 times more massive and around 70 times larger. Its surface has an effective temperature of 14,600 K . [ 5 ] It has a stellar wind that is causing mass loss at the rate of 0.38–0.46 × 10 −9 solar masses per year, or the equivalent of the Sun's mass every 2.4 billion years.
AB Aurigae b has a radius 2.75 times that of Jupiter, an effective temperature of 2,200 Kelvin, and a surface gravity of 3.5 cgs, which is three times Earth's surface gravity. [ 1 ] The mass of AB Aurigae b is uncertain, spanning both the planetary and brown dwarf mass regimes.
This is the list of notable stars in the constellation Auriga, sorted by decreasing brightness. Name B F Var HD HIP RA Dec vis. mag. abs. ... V min = 1.98 m, P = 3. ...
Messier 38 or M38, also known as NGC 1912 or Starfish Cluster, [4] is an open cluster of stars in the constellation of Auriga. It was discovered by Giovanni Batista Hodierna before 1654 and independently found by Le Gentil in 1749. The open clusters M36 and M37, also discovered by Hodierna, are often grouped together with M38. [5]
The star has been observed to flare, during which the X-ray emission rose to 3.2 × 10 31 erg s −1. [4] IQ Aurigae is 6.3 [4] million years old and is spinning with a projected rotational velocity of 49 km/s, giving it a rotation period of 2.47 days. [9] It has nearly four times the mass of the Sun and 2.6 times the Sun's radius.