Short description: Binary star system in the constellation Aries
λ Arietis
Location of λ Arietis (circled) |
Observation data
Equinox J2000.0]] (ICRS)
|
| Constellation
|
Aries
|
| Right ascension
|
01h 57m 55.71647s[1]
|
| Declination
|
+23° 35′ 45.8295″[1]
|
| Apparent magnitude (V)
|
4.79[2] (4.95/7.75)[3]
|
| Characteristics
|
| Spectral type
|
F0 V + G1 V[3]
|
| U−B color index
|
+0.09[2]
|
| B−V color index
|
+0.28[2]
|
| R−I color index
|
0.16
|
| Astrometry |
|---|
|
|---|
| Radial velocity (Rv) | -1.4[4] km/s |
| Proper motion (μ) | RA: -92.55[1] mas/yr
Dec.: -13.25[1] mas/yr |
| Parallax (π) | 25.32 ± 0.30[1] mas |
| Distance | 129 ± 2 ly
(39.5 ± 0.5 pc) |
|
|---|
| Details |
|---|
| λ Ari A |
|---|
| Surface gravity (log g) | 3.88[5] cgs |
| Temperature | 7,177[5] K |
| Metallicity [Fe/H] | +0.01[5] dex |
| Rotational velocity (v sin i) | 107[6] km/s |
| λ Ari B |
|---|
| Surface gravity (log g) | 3.88[5] cgs |
| Temperature | 5,929[5] K |
| Metallicity [Fe/H] | –0.03[5] dex |
| Other designations |
|---|
9 Arietis, BD+22 288, HD 11973, HIP 9153, HR 569, SAO 75051, GC 2366, ADS 1563, CCDM 01580+2336. [7] |
| Database references |
|---|
| SIMBAD | data |
Lambda Arietis (λ Ari, λ Arietis) is the Bayer designation for a double star in the northern constellation of Aries. Based upon an annual parallax shift of 25.32 arcseconds, this system is approximately 129 light-years (40 parsecs) distant from Earth. The pair have a combined apparent visual magnitude of 4.79,[2] which is bright enough to be viewed with the naked eye. Because the yellow secondary is nearly three magnitudes fainter than the white primary, they are a challenge to split with quality 7× binoculars and are readily resolvable at 10×.[8]
The brighter component is an F-type main sequence star with a visual magnitude of 4.95 and a stellar classification of F0 V.[3] At an angular separation of 37.4 arcseconds is fainter, magnitude 7.75 companion. This is a G-type main sequence star with a classification of G1 V.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 3.0 3.1 3.2 3.3 Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Washington: Carnegie Institution of Washington), Bibcode: 1953GCRV..C......0W.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Soubiran, C.; Le Campion, J.-F.; Cayrel de Strobel, G.; Caillo, A. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics 515: A111, doi:10.1051/0004-6361/201014247, Bibcode: 2010A&A...515A.111S.
- ↑ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R.
- ↑ "lam Ari". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=lam+Ari.
- ↑ Harrington, Philip S. (2010), Cosmic Challenge: The Ultimate Observing List for Amateurs, Cambridge University Press, p. 113, ISBN 978-0521899369, https://books.google.com/books?id=8mQmvT4wpWQC&pg=PA113
References
 | Original source: https://en.wikipedia.org/wiki/Lambda Arietis. Read more |
