HD 107146
 False colour image of HD 107146 taken by the Hubble Space Telescope, showing its circumstellar disc. The right side of the disc is brighter due to inclination of the disc to the line of sight and preferential forward scattering of the light from the star. | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 12h 19m 06.50230s[1] |
| Declination | 16° 32′ 53.8628″[1] |
| Apparent magnitude (V) | 7.028[2] |
| Characteristics | |
| Spectral type | G2V[3] |
| U−B color index | +0.073[2] |
| B−V color index | +0.602[2] |
| Astrometry | |
| Radial velocity (Rv) | 1.88[4] km/s |
| Proper motion (μ) | RA: -174.16[1] mas/yr Dec.: -148.90[1] mas/yr |
| Parallax (π) | 36.42 ± 0.54[1] mas |
| Distance | 90 ± 1 ly (27.5 ± 0.4 pc) |
| Details | |
| Mass | 1.09[5] M☉ |
| Radius | 0.993±0.014[5] R☉ |
| Luminosity | 1.1[6] L☉ |
| Surface gravity (log g) | 4.56[7] cgs |
| Temperature | 5850[5] K |
| Metallicity [Fe/H] | 0.00[7] dex |
| Rotation | 3.50±1.35 days[5] |
| Age | 80–200 myr[8] years |
| Other designations | |
HD 107146 is a star in the constellation Coma Berenices that is located about 90 light years from Earth.[8] The apparent magnitude of 7.028 makes this star too faint to be seen with the unaided eye.
The physical properties of this star are similar to the Sun, including the stellar classification G2V,[3] making this a solar analog.[9] The mass of this star is about 109% of the solar mass (M☉) and it has about 99% the radius of the Sun (R☉).[5] It is a young star with an age between 80 and 200 Myr.[8] The axis of rotation is estimated at 21+8
−9 degrees to the line of sight and it completes a rotation in a relatively brief 3.5 days.[5]
Circumstellar disc
In 2003, astronomers recognized the excess infrared[10] and submillimeter[8] emission indicative of circumstellar dust, the first time such a debris disk phenomenon was noted around a star of similar spectral types to the Sun, though having a much younger age. In 2004 the Hubble Space Telescope detected the presence of a spatially resolved disk surrounding the star[6][11]
The star's circumstellar disc has dimensions of approximately 210 x 300 AU.[8] The dusty ring is cool, with a temperature of 51 K, and has a mass of 0.10 Earth masses (M⊕).[8] Analysis of the debris disk in the far-infrared and submillimeter wavelengths, carried out using the Hubble Space Telescope, suggests the presence of small grains in the disk.[6] The disk appears to be slightly elongated to form an ellipse with its minor axis at a position angle of 58° ± 5°; working under the assumption that the disk is in fact circular gives it an inclination of 25° ± 5° from the plane of the sky.[6] An analysis published in 2009 suggests the possible presence of a planet at a separation of 45-75 AU.[9]
References
- 1 2 3 4 5 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. - 1 2 3 Landolt, A. U. (June 1983), "UBVRI photometry of stars useful for checking equipment orientation stability", Astronomical Journal, 88: 853–866, Bibcode:1983AJ.....88..853L, doi:10.1086/113372
- 1 2 3 "HD 107146". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2011-12-14.
- ↑ White, Russel J.; et al. (June 2007), "High-dispersion optical spectra of nearby stars younger than the Sun", The Astronomical Journal, 133 (6): 2524–2536, arXiv:0706.0542, Bibcode:2007AJ....133.2524W, doi:10.1086/514336
- 1 2 3 4 5 6 Watson, C. A.; et al. (May 2011). "On the alignment of debris discs and their host stars' rotation axis - implications for spin-orbit misalignment in exoplanetary systems". Monthly Notices of the Royal Astronomical Society: Letters. 413 (1): L71–L75. arXiv:1009.4132. Bibcode:2011MNRAS.413L..71W. doi:10.1111/j.1745-3933.2011.01036.x.
- 1 2 3 4 Ardila, D. R.; et al. (2004). "A resolved debris disk around the G2 V star HD 107146". The Astrophysical Journal Letters. 617: L147–L150. arXiv:astro-ph/0411422. Bibcode:2004ApJ...617L.147A. doi:10.1086/427434.
- 1 2 Brugamyer, Erik; et al. (September 2011). "Silicon and Oxygen Abundances in Planet-host Stars". The Astrophysical Journal. 738 (1). arXiv:1106.5509. Bibcode:2011ApJ...738...97B. doi:10.1088/0004-637X/738/1/97.
- 1 2 3 4 5 6 Williams, Jonathan P.; et al. (March 2004). "Detection of cool dust around the G2 V star HD 107146". The Astrophysical Journal. 604: 414–419. arXiv:astro-ph/0311583. Bibcode:2004ApJ...604..414W. doi:10.1086/381721.
- 1 2 Corder, S. A.; et al. (2009). "A resolved ring of debris dust around the solar analog HD 107146". The Astrophysical Journal. 690: L65–L68. arXiv:0811.2713. Bibcode:2009ApJ...690L..65C. doi:10.1088/0004-637X/690/1/L65.
- ↑ Metchev, Stanimir A.; Hillenbrand, Lynne A.; Meyer, Michael R. (January 2004). "Ten micron observations of nearby young stars". The Astrophysical Journal. 600: 435–450. arXiv:astro-ph/0309453. Bibcode:2004ApJ...600..435M. doi:10.1086/379788.
- ↑ "Spitzer and Hubble capture evolving planetary systems". hubblesite.org. December 9, 2004. Retrieved 2011-12-14.