AB Aurigae

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AB Aurigae
Abaurigae hst big.jpg
AB Aurigae and its dust disk.
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 04h 55m 45.8445s
Declination +30° 33′ 04.292″
Apparent magnitude (V) 7.06
Characteristics
Spectral type A0Vpe
U−B color index 0.04
B−V color index 0.11
Variable type Orion variable
Astrometry
Radial velocity (Rv) 8 km/s
Proper motion (μ) RA: 1.71 mas/yr
Dec.: -24.24 mas/yr
Parallax (π) 6.93 ± 0.95 mas
Distance approx. 470 ly
(approx. 140 pc)
Absolute magnitude (MV) 7.18
Details
Mass 3.1 M
Radius 2.1 R
Luminosity 40 L
Temperature 7,500–10,000 K
Age 3 ± 4 million years
Other designations
BD+30° 741, HD 31293, SAO 57506, HIP 22910.
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

AB Aurigae is a star in the Auriga constellation. It is better known for hosting a dust disk that may harbour a condensing planet or brown dwarf. The star could host a possible substellar companion in wide orbit.

A planetary system?[edit]

Oppenheimer et al. (2008)[1] observed an annulus feature in AB Aurigae's dust disk between 43 and 302 AU from the star, a region never seen before. An azimuthal gap in an annulus of dust at a radius of 102 AU would suggest the formation of at least one small body at an orbital distance of nearly 100 AU. Such object could turn out either a massive planetary companion or more likely a brown dwarf companion, in both cases located at nearly 100 AU from the bright star. So far the object is unconfirmed.

The AB Aurigae planetary system[1]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(years)
Eccentricity Inclination Radius
b (unconfirmed) ≥5–37 MJ 102 ≥800  ?

See also[edit]

References[edit]

  1. ^ a b Oppenheimer, Ben R.; et al. (2008). "The Solar-System-Scale Disk around AB Aurigae". The Astrophysical Journal 679 (2): 1574–1581. arXiv:0803.3629. Bibcode:2008ApJ...679.1574O. doi:10.1086/587778. 

Further reading[edit]

  • Fukagawa, Misato; Hayashi, Masahiko; Tamura, Motohide; Itoh, Yoichi; Hayashi, Saeko S.; Oasa, Yumiko; Takeuchi, Taku; Morino, Jun-ichi; Murakawa, Koji; Oya, Shin; Yamashita, Takuya; Suto, Hiroshi; Mayama, Satoshi; Naoi, Takahiro; Ishii, Miki; Pyo, Tae-Soo; Nishikawa, Takayuki; Takato, Naruhisa; Usuda, Tomonori; Ando, Hiroyasu; Iye, Masanori; Miyama, Shoken M.; Kaifu, Norio (2004). "Spiral Structure in the Circumstellar Disk around AB Aurigae". The Astrophysical Journal 605 (1): L53–L56. Bibcode:2004ApJ...605L..53F. doi:10.1086/420699. 

External links[edit]