HD 4391

HD 4391
Observation data
Epoch J2000      Equinox J2000
Constellation Phoenix
Right ascension 00h 45m 45.5930s[1]
Declination −47° 33′ 07.147″[1]
Apparent magnitude (V) 5.80[2]
Characteristics
Spectral type G3V[3]
B−V color index +0.64[4]
Astrometry
Radial velocity (Rv) −11.4[5] km/s
Proper motion (μ) RA: 183.96[1] mas/yr
Dec.: 78.36[1] mas/yr
Parallax (π) 66.92 ± 0.73[1] mas
Distance 48.7 ± 0.5 ly
(14.9 ± 0.2 pc)
Details
Mass 1.22 ± 0.04[6] M☉
Surface gravity (log g) 4.85[6]
Temperature 5,955[6] K
Metallicity \begin{smallmatrix}\left[\frac{Fe}{H}\right]\ =\ 0.01\end{smallmatrix}[6]
Rotation 12 days[7]
Rotational velocity (v sin i) 3.5[3] km/s
Age 1.2[7] Gyr
Other designations
GJ 1021, HR 209, CD-48 176, HD 4391, SAO 215232, HIP 3583.[2]

HD 4391 is a star in the constellation Phoenix that is located at a distance of 48.7 light years from the Sun. It 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.[6] The spectrum for this star displays an abnormally low level of beryllium, which may be caused by some type of mixing process.[7]

Presently, no planet has been detected in orbit around this star.[6] Nor does it emit a statistically significant excess of infrared radiation that might indicate a debris disk.[8] However, it has two optical companions, at least one of which may share a common proper motion through space with HD 4391.[9]

References

  1. ^ a b c d e Perryman, M. A. C.; et al. (1997). "The Hipparcos Catalogue". Astronomy and Astrophysics 323: L49–L52. Bibcode 1997A&A...323L..49P. 
  2. ^ a b "HD 4391 -- Pre-main sequence Star". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+4391. Retrieved 2010-07-13. 
  3. ^ a b 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. arXiv:astro-ph/0609258. Bibcode 2006A&A...460..695T. doi:10.1051/0004-6361:20065602. 
  4. ^ Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewski, W. Z. (1966). "UBVRIJKL photometry of the bright stars.". Communications of the Lunar and Planetary Laboratory 4: 99. Bibcode 1966CoLPL...4...99J. 
  5. ^ Evans, D. S. (June 20-24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Alan Henry Batten and John Frederick Heard. Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto. p. 57. Bibcode 1967IAUS...30...57E. 
  6. ^ a b c d e f Santos, N. C.; Israelian, G.; Mayor, M. (July 2001). "The metal-rich nature of stars with planets". Astronomy and Astrophysics 373: 1019–1031. arXiv:astro-ph/0105216. Bibcode 2001A&A...373.1019S. doi:10.1051/0004-6361:20010648. 
  7. ^ a b c Santos, N. C.; Israelian, G.; Randich, S.; García López, R. J.; Rebolo, R. (2004). "Beryllium anomalies in solar-type field stars". Astronomy and Astrophysics 425: 1013–1027. arXiv:astro-ph/0408109. Bibcode 2004A&A...425.1013S. doi:10.1051/0004-6361:20040510. 
  8. ^ 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. arXiv:astro-ph/0611682. Bibcode 2006ApJ...652.1674B. doi:10.1086/508449. 
  9. ^ Raghavan, Deepak (2009). "A Survey of Stellar Families". Georgia State University. http://www.chara.gsu.edu/~raghavan/dissertation/Dissertation_Main_thru_AppendixA.pdf. Retrieved 2010-07-13.