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Chi Aurigae information


Chi Aurigae
The location of χ Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 32m 43.67312s[1]
Declination +32° 11′ 31.2753″[1]
Apparent magnitude (V) 4.74[2]
Characteristics
Spectral type B5 Iab[3]
U−B color index –0.44[2]
B−V color index +0.32[2]
Astrometry
Radial velocity (Rv)–0.2[4] km/s
Proper motion (μ) RA: –1.52[1] mas/yr
Dec.: –4.33[1] mas/yr
Distance3,000 ly
(912[5] pc)
Absolute magnitude (MV)–6.4[5]
Orbit[5]
Period (P)676.85 ± 0.21 d
Eccentricity (e)0.116 ± 0.048
Longitude of the node (Ω)181.7° ± 24.3°
Periastron epoch (T)2422754.2 ± 46.1 HJD
Semi-amplitude (K1)
(primary)
22.0 ± 2.9 km/s
Details
Surface gravity (log g)2.5[5] cgs
Temperature15,500[6] K
Rotational velocity (v sin i)40[7] km/s
Other designations
χ Aur, 25 Aurigae, BD+32°1024, HD 36371, HIP 25984, HR 1843, SAO 58164[8]
Database references
SIMBADdata

Chi Aurigae, Latinized from χ Aurigae, is the Bayer designation for a binary star system in the northern constellation of Auriga. It is faintly visible to the naked eye with an apparent visual magnitude of 4.74.[2] The annual parallax shift of this object is much smaller than the measurement error, making distance estimates by that means unreliable.[1] The estimated distance to this star is approximately 3,000 light years. The brightness of the star is diminished by 1.26 in magnitude from extinction caused by intervening gas and dust.[5]

Chi Aurigae is a spectroscopic binary with an orbital period of 676.85 d and an eccentricity of 0.12.[9] The primary component of this system is a supergiant star with a stellar classification of B5 Iab.[3] 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.[6]

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  2. ^ a b c d Cite error: The named reference aj76_1058 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference apjs17_371 was invoked but never defined (see the help page).
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  5. ^ a b c d e Cite error: The named reference aaa331_550 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference aaa521_L55 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference apj573_1_359 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aaa424_2_727 was invoked but never defined (see the help page).

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