Epsilon Ursae Majoris
Epsilon Ursae Majoris or Alioth is a white star in the Ursa Major constellation.
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 12h 54m 01.74959s[1] |
| Declination | +55° 57′ 35.3627″[1] |
| Apparent magnitude (V) | 1.77[2] |
| Characteristics | |
| Spectral type | A1III-IVp kB9 |
| U−B color index | +0.02[2] |
| B−V color index | -0.02[2] |
| Variable type | α2 CVn |
| Astrometry | |
| Radial velocity (Rv) | -9.3[3] km/s |
| Proper motion (μ) | RA: +111.91[1] mas/yr Dec.: -8.24[1] mas/yr |
| Parallax (π) | 39.51 ± 0.20[1] mas |
| Distance | 82.6 ± 0.4 ly (25.3 ± 0.1 pc) |
| Absolute magnitude (MV) | –0.2[4] |
| Details | |
| Mass | 2.91[5] M☉ |
| Radius | 4.14[6] R☉ |
| Luminosity | 102[7] L☉ |
| Surface gravity (log g) | 3.23[8] cgs |
| Temperature | 9,020[8] K |
| Metallicity [Fe/H] | +0.00[4] dex |
| Rotational velocity (v sin i) | 33[9] km/s |
| Age | 300[10] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Epsilon Ursae Majoris Media
A light curve for Epsilon Ursae Majoris, plotted from TESS data
Related pages
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F.. Validation of the new Hipparcos reduction. Astronomy and Astrophysics 474 (2) (November 2007). p. 653–664. doi:10.1051/0004-6361:20078357.
- ↑ 2.0 2.1 2.2 Johnson, H. L.. UBVRIJKL photometry of the bright stars. Communications of the Lunar and Planetary Laboratory 4 (99) (1966). p. 99.
- ↑ Evans, D. S.. The Revision of the General Catalogue of Radial Velocities. Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 30 (June 20–24, 1966). University of Toronto: International Astronomical Union. p. 57.
- ↑ 4.0 4.1 Tektunali, H. G.. The spectrum of the CR star Epsilon Ursae Majoris. Astrophysics and Space Science 77 (1) (June 1981). p. 41–58. doi:10.1007/BF00648756.
- ↑ Shaya, Ed J.. Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue. The Astrophysical Journal Supplement 192 (1) (January 2011). p. 2. doi:10.1088/0067-0049/192/1/2.
- ↑ Shulyak, D.. Interferometry of chemically peculiar stars: Theoretical predictions versus modern observing facilities. Monthly Notices of the Royal Astronomical Society 443 (2) (2014). p. 1629. doi:10.1093/mnras/stu1259.
- ↑ Katarzyński, K.. Search for exoplanets and brown dwarfs with VLBI. Monthly Notices of the Royal Astronomical Society 461 (1) (2016). p. 929. doi:10.1093/mnras/stw1354.
- ↑ 8.0 8.1 Gray, R. O.. Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I. The Astronomical Journal 126 (4) (2003). p. 2048. doi:10.1086/378365.
- ↑ Royer, F.. Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i. Astronomy and Astrophysics 393 (3) (October 2002). p. 897–911. doi:10.1051/0004-6361:20020943.
- ↑ Nakajima, Tadashi. Potential Members of Stellar Kinematic Groups within 30 pc of the Sun. The Astronomical Journal 143 (1) (2012). p. 2. doi:10.1088/0004-6256/143/1/2.
