HD 207129 is a G-type pre-main-sequence star in the constellation of Grus.[1] It has an apparent visual magnitude of approximately 5.58.[1] This is a Sun-like star with the same stellar classification G2V and a similar mass. It is roughly the same age as the Sun, but has a lower abundance of elements other than hydrogen and helium; (which astronomers refer to as the star's metallicity).[4]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 21h 48m 15.7514s[1] |
| Declination | −47° 18′ 13.014″[1] |
| Apparent magnitude (V) | 5.58[1] |
| Characteristics | |
| Spectral type | G2V[1] |
| U−B color index | 0.08[2] |
| B−V color index | 0.60[2] |
| Astrometry | |
| Radial velocity (Rv) | −7.6 ± 0.2[1] km/s |
| Proper motion (μ) | RA: 165.64[1] mas/yr Dec.: −295.00[1] mas/yr |
| Parallax (π) | 63.95 ± 0.78 mas[1] |
| Distance | 51.0 ± 0.6 ly (15.6 ± 0.2 pc) |
| Absolute magnitude (MV) | 4.61[3] |
| Details | |
| Mass | 0.97 0.07 −0.05[4] M☉ |
| Radius | 1.0[5] R☉ |
| Temperature | 5900[4] K |
| Metallicity [Fe/H] | −0.15[4] dex |
| Rotational velocity (v sin i) | 2[4] km/s |
| Age | 3.8 3.6 −2.5[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
A debris disk has been imaged around this star in visible light using the ACS instrument on the Hubble Space Telescope; it has also been imaged in the infrared (70 μm) using the MIPS instrument on the Spitzer Space Telescope. Based on the ACS image, the disk appears to have a radius of about 163 astronomical units and to be about 30 AU wide, and to be inclined at 60° to the plane of the sky.[6]
Another star, CCDM J21483-4718B (also designated CD−47 13929 or WDS J21483-4718B), of apparent visual magnitude 8.7, has been observed 55 arcseconds away from this star,[7] but based on comparison of proper motions, it is believed to be an optical double and not physically related to its companion.[8]
References
edit- ^ a b c d e f g h i j k HD 207129 -- Pre-main sequence Star, database entry, SIMBAD. Accessed on line February 9, 2011.
- ^ a b HR 8323, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line February 9, 2011.
- ^ From apparent magnitude and parallax.
- ^ a b c d e f HD 207129, database entry, The Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, CDS ID V/117A. Accessed on line February 9, 2011.
- ^ HD 207129, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line February 9, 2011.
- ^ HST and Spitzer Observations of the HD 207129 Debris Ring, John E. Krist et al., The Astronomical Journal 140, #4 (October 2010), pp. 1051-1061, doi:10.1088/0004-6256/140/4/1051, Bibcode:2010AJ....140.1051K.
- ^ CCDM J21483-4718, database entry, CCDM (Catalog of Components of Double & Multiple stars), J. Dommanget and O. Nys, second edition, 2002, VizieR database I/274.
- ^ Notes, WDS 21483-4718, The Washington Double Star Catalog, B. D. Mason et al., version 2011-02-06, VizieR database B/wds.