Astronomy:HD 4391
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Phoenix |
| Right ascension | 00h 45m 45.5930s[1] |
| Declination | –47° 33′ 07.1438″[1] |
| Apparent magnitude (V) | 5.80[2] |
| Characteristics | |
| Spectral type | G3V[3] |
| B−V color index | +0.64[2] |
| Astrometry | |
| Radial velocity (Rv) | –11.4[4] km/s |
| Proper motion (μ) | RA: 183.99[1] mas/yr Dec.: 78.81[1] mas/yr |
| Parallax (π) | 65.97 ± 0.39[1] mas |
| Distance | 49.4 ± 0.3 ly (15.16 ± 0.09 pc) |
| Details | |
| Mass | 1.22 ± 0.04[5] M☉ |
| Surface gravity (log g) | 4.85[5] cgs |
| Temperature | 5,955[5] K |
| Metallicity [Fe/H] | 0.01[5] dex |
| Rotation | 12 days[6] |
| Rotational velocity (v sin i) | 3.5[3] km/s |
| Age | 1.2[6] Gyr |
| Other designations | |
CD-48 176, HD 4391, GJ 1021, HIP 3583, HR 209, SAO 215232.[7] | |
| Database references | |
| SIMBAD | data |
HD 4391 is a triple star system[8] in the constellation Phoenix that is located at a distance of 48.7 light years from the Sun. The primary has a stellar classification of G3V, which is a G-type main sequence star. The physical properties of this star are similar to the Sun, making it a solar analog. However, it is believed to have 22% greater mass than the Sun and is only 1.2 billion years old.[5] The spectrum for this star displays an abnormally low level of beryllium, which may be the result of some form of mixing process.[6]
No planet has been detected in orbit around this star,[5] nor does it emit a statistically significant excess of infrared radiation that might indicate a debris disk.[9] However, it has two companions that share a common proper motion through space with HD 4391, effectively making it a triple star system. The first, a red dwarf of type M4, lies at an angular separation of 17″ from the primary. The second is a type M5 star at a separation of 49″.[8]
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 Johnson, H. L. et al. (1966). "UBVRIJKL photometry of the bright stars.". Communications of the Lunar and Planetary Laboratory 4: 99. Bibcode: 1966CoLPL...4...99J.
- ↑ 3.0 3.1 Torres, C. A. O. et al. (December 2006). "Search for associations containing young stars (SACY). I. Sample and searching method". Astronomy and Astrophysics 460 (3): 695–708. doi:10.1051/0004-6361:20065602. Bibcode: 2006A&A...460..695T.
- ↑ Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". in Alan Henry Batten. University of Toronto: Academic Press, London. p. 57. Bibcode: 1967IAUS...30...57E.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Santos, N. C. et al. (July 2001). "The metal-rich nature of stars with planets". Astronomy and Astrophysics 373 (3): 1019–1031. doi:10.1051/0004-6361:20010648. Bibcode: 2001A&A...373.1019S.
- ↑ 6.0 6.1 6.2 Santos, N. C. et al. (October 2004). "Beryllium anomalies in solar-type field stars". Astronomy and Astrophysics 425 (3): 1013–1027. doi:10.1051/0004-6361:20040510. Bibcode: 2004A&A...425.1013S.
- ↑ "HD 4391 -- Pre-main sequence Star". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+4391.
- ↑ 8.0 8.1 Raghavan, Deepak et al. (September 2010). "A Survey of Stellar Families: Multiplicity of Solar-type Stars". The Astrophysical Journal Supplement 190 (1): 1–42. doi:10.1088/0067-0049/190/1/1. Bibcode: 2010ApJS..190....1R.
- ↑ Beichman, C. A. et al. (December 2006). "New Debris Disks around Nearby Main-Sequence Stars: Impact on the Direct Detection of Planets". The Astrophysical Journal 652 (2): 1674–1693. doi:10.1086/508449. Bibcode: 2006ApJ...652.1674B.
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