  | |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Aries |
| Right ascension | 03h 22m 45.24006s [1] |
| Declination | +20° 44′ 31.4382″ [1] |
| Apparent magnitude (V) | +5.09 [2] |
| Characteristics | |
| Spectral type | K3 III [3] |
| U−B color index | +1.27 [2] |
| B−V color index | 1.238 [4] |
| Astrometry | |
| Radial velocity (Rv) | +2.45 ± 0.24 [4] km/s |
| Proper motion (μ) |
RA: –51.59
[1]
mas/
yr Dec.: –16.06 [1] mas/ yr |
| Parallax (π) | 10.27 ± 0.60 mas [1] |
| Distance | 320 ± 20
ly (97 ± 6 pc) |
| Absolute magnitude (MV) | +0.17 [5] |
| Details | |
| Radius | 19 [4] R☉ |
| Luminosity | 120 [4] L☉ |
| Surface gravity (log g) | 2.1 [4] cgs |
| Temperature | 4,406 [4] K |
| Metallicity [Fe/H] | +0.02 [4] dex |
| Rotational velocity (v sin i) | 3.4 [4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Tau2 Arietis, Latinized from τ2 Arietis, is the Bayer designation for a binary star [7] in the northern constellation on Aries. The combined apparent visual magnitude of this system is +5.09, [2] which is bright enough to be seen with the naked eye. With an annual parallax shift of 10.27 mas, [1] it is located at a distance of approximately 320 light-years (98 parsecs) from Earth, give or take a 20 light-year margin of error. At this distance the brightness of the star is diminished by 0.18 in magnitude because of extinction from interstellar gas and dust. [8]
The primary component is an evolved giant star with a stellar classification of K3 III. [9] It has expanded to 19 times the radius of the Sun, from which it is radiating 120 times the Sun's luminosity. [4] This energy is being emitted into outer space from the outer atmosphere at an effective temperature of 4,406 K, [4] giving it the cool orange glow of a K-type star. At an angular separation of 0.53 arcseconds is a magnitude 8.50 companion. [7]
References
- ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133 (4): 475, Bibcode: 1966MNRAS.133..475A, doi: 10.1093/mnras/133.4.475.
- ^ Cenarro, A. J.; et al. (January 2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters", Monthly Notices of the Royal Astronomical Society, 374 (2): 664–690, arXiv: astro-ph/0611618, Bibcode: 2007MNRAS.374..664C, doi: 10.1111/j.1365-2966.2006.11196.x, S2CID 119428437.
- ^ a b c d e f g h i j Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode: 2008AJ....135..209M, doi: 10.1088/0004-6256/135/1/209, S2CID 121883397.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
-
^
"63 Ari".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2012-07-18.
{{ cite web}}: CS1 maint: postscript ( link) - ^ a b 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. arXiv: 0806.2878. Bibcode: 2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
- ^ Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv: astro-ph/0409579, Bibcode: 2005A&A...430..165F, doi: 10.1051/0004-6361:20041272, S2CID 17804304
- ^ Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal, 116: 122, Bibcode: 1952ApJ...116..122R, doi: 10.1086/145598.
External links
| |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Aries |
| Right ascension | 03h 22m 45.24006s [1] |
| Declination | +20° 44′ 31.4382″ [1] |
| Apparent magnitude (V) | +5.09 [2] |
| Characteristics | |
| Spectral type | K3 III [3] |
| U−B color index | +1.27 [2] |
| B−V color index | 1.238 [4] |
| Astrometry | |
| Radial velocity (Rv) | +2.45 ± 0.24 [4] km/s |
| Proper motion (μ) |
RA: –51.59
[1]
mas/
yr Dec.: –16.06 [1] mas/ yr |
| Parallax (π) | 10.27 ± 0.60 mas [1] |
| Distance | 320 ± 20
ly (97 ± 6 pc) |
| Absolute magnitude (MV) | +0.17 [5] |
| Details | |
| Radius | 19 [4] R☉ |
| Luminosity | 120 [4] L☉ |
| Surface gravity (log g) | 2.1 [4] cgs |
| Temperature | 4,406 [4] K |
| Metallicity [Fe/H] | +0.02 [4] dex |
| Rotational velocity (v sin i) | 3.4 [4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Tau2 Arietis, Latinized from τ2 Arietis, is the Bayer designation for a binary star [7] in the northern constellation on Aries. The combined apparent visual magnitude of this system is +5.09, [2] which is bright enough to be seen with the naked eye. With an annual parallax shift of 10.27 mas, [1] it is located at a distance of approximately 320 light-years (98 parsecs) from Earth, give or take a 20 light-year margin of error. At this distance the brightness of the star is diminished by 0.18 in magnitude because of extinction from interstellar gas and dust. [8]
The primary component is an evolved giant star with a stellar classification of K3 III. [9] It has expanded to 19 times the radius of the Sun, from which it is radiating 120 times the Sun's luminosity. [4] This energy is being emitted into outer space from the outer atmosphere at an effective temperature of 4,406 K, [4] giving it the cool orange glow of a K-type star. At an angular separation of 0.53 arcseconds is a magnitude 8.50 companion. [7]
References
- ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133 (4): 475, Bibcode: 1966MNRAS.133..475A, doi: 10.1093/mnras/133.4.475.
- ^ Cenarro, A. J.; et al. (January 2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters", Monthly Notices of the Royal Astronomical Society, 374 (2): 664–690, arXiv: astro-ph/0611618, Bibcode: 2007MNRAS.374..664C, doi: 10.1111/j.1365-2966.2006.11196.x, S2CID 119428437.
- ^ a b c d e f g h i j Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode: 2008AJ....135..209M, doi: 10.1088/0004-6256/135/1/209, S2CID 121883397.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
-
^
"63 Ari".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2012-07-18.
{{ cite web}}: CS1 maint: postscript ( link) - ^ a b 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. arXiv: 0806.2878. Bibcode: 2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
- ^ Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv: astro-ph/0409579, Bibcode: 2005A&A...430..165F, doi: 10.1051/0004-6361:20041272, S2CID 17804304
- ^ Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal, 116: 122, Bibcode: 1952ApJ...116..122R, doi: 10.1086/145598.