Astronomy:40 Aurigae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 06h 06m 35.09752s[2] |
| Declination | +38° 28′ 57.5285″[2] |
| Apparent magnitude (V) | 5.345[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A4m[4] |
| U−B color index | +0.11[5] |
| B−V color index | +0.23[5] |
| Astrometry | |
| Radial velocity (Rv) | 16.90±7.4[6] km/s |
| Proper motion (μ) | RA: +9.452[2] mas/yr Dec.: −54.087[2] mas/yr |
| Parallax (π) | 9.1085 ± 0.0728[2] mas |
| Distance | 358 ± 3 ly (109.8 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.26[1] |
| Orbit[4] | |
| Period (P) | 28.28 d |
| Eccentricity (e) | 0.56 |
| Periastron epoch (T) | JD 2420468.197 |
| Argument of periastron (ω) (secondary) | 178.4° |
| Semi-amplitude (K1) (primary) | 51.4 km/s |
| Semi-amplitude (K2) (secondary) | 62.5 km/s |
| Details | |
| Mass | 1.81[7] M☉ |
| Radius | 4.62[7] R☉ |
| Luminosity | 68[7] L☉ |
| Surface gravity (log g) | 3.88±0.08[8] cgs |
| Temperature | 7,838±52[8] K |
| Metallicity [Fe/H] | +0.35±0.05[8] dex |
| Rotational velocity (v sin i) | 71[9] km/s |
| Age | 559[2] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
40 Aurigae is a binary star in the constellation Auriga. Its apparent magnitude is 5.345,[3] meaning it can just barely be seen with the naked eye. Based on parallax estimates made by the Hipparcos spacecraft, the system is located some 340 light-years (104 parsecs) away.
40 Aurigae is a spectroscopic binary, meaning the two stars are too close to be individually resolved, but periodic Doppler shifts in their spectra indicate there must be orbital motion. In this case, light from both stars can be detected and it is a double-lined spectroscopic binary.[4] The two have an orbital period of 28.28 days and a fairly high eccentricity of 0.56.[4] The primary star is an A-type main-sequence star and shows unusual absorption lines in its spectrum, so it is an Am star[4] with an effective temperature of 7,838 K.[8]
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H.
- ↑ 4.0 4.1 4.2 4.3 4.4 Pourbaix, D. et al. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics 424 (2): 727–732. doi:10.1051/0004-6361:20041213. Bibcode: 2004A&A...424..727P.
- ↑ 5.0 5.1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M.
- ↑ Kharchenko, N. V. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten 328 (9): 889. doi:10.1002/asna.200710776. Bibcode: 2007AN....328..889K.
- ↑ 7.0 7.1 7.2 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ 8.0 8.1 8.2 8.3 Koleva, M.; Vazdekis, A. (2012). "Stellar population models in the UV. I. Characterisation of the New Generation Stellar Library". Astronomy & Astrophysics 538: A143. doi:10.1051/0004-6361/201118065. Bibcode: 2012A&A...538A.143K.
- ↑ Royer, F.; Grenier, S.; Baylac, M.-O.; Gómez, A. E.; Zorec, J. (2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin I". Astronomy and Astrophysics 393: 897. doi:10.1051/0004-6361:20020943. Bibcode: 2002A&A...393..897R.
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