Astronomy:f Eridani

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Short description: Multiple star system in the constellation Eridanus

f Eridani
Location of f Eridani (circled)
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Eridanus
HD 24072
Right ascension  03h 48m 35.87402s[1]
Declination −37° 37′ 12.5158″[1]
Apparent magnitude (V) 4.721±0.009[2]
HD 24071
Right ascension  03h 48m 35.47769s[3]
Declination −37° 37′ 19.2124″[3]
Apparent magnitude (V) 5.246±0.009[2]
Characteristics
HD 24072
Evolutionary stage main sequence[4]
Spectral type B9.5 Van[5]
HD 24071
Evolutionary stage main sequence[3]
Spectral type A1 Va[5]
Variable type suspected[6]
Astrometry
HD 24072
Proper motion (μ) RA: +81.136[1] mas/yr
Dec.: −6.795[1] mas/yr
Parallax (π)18.8093 ± 0.2220[1] mas
Distance173 ± 2 ly
(53.2 ± 0.6 pc)
Absolute magnitude (MV)1.194±0.190[2]
HD 24071
Proper motion (μ) RA: +63.372[3] mas/yr
Dec.: −8.121[3] mas/yr
Parallax (π)18.7976 ± 0.0582[3] mas
Distance173.5 ± 0.5 ly
(53.2 ± 0.2 pc)
Absolute magnitude (MV)1.719±0.190[2]
Details
HD 24072
Mass2.6[7] M☉
Radius2.0[7] R☉
Luminosity35[7] L☉
Surface gravity (log g)4.26[7] cgs
Temperature10,046[7] K
Metallicity [Fe/H]−0.49[8] dex
Rotational velocity (v sin i)225[9] km/s
Age45±4[2] Myr
HD 24071
Mass2.1[3] M☉
Radius1.7[3] R☉
Luminosity20[3] L☉
Surface gravity (log g)4.16[3] cgs
Temperature9,503[3] K
Rotational velocity (v sin i)39[9] km/s
Age45±4[2] Myr
Other designations
f Eridani, CD−38 1297, HIP 17797, WDS J03486-3737[10]
A: HD 24072, HR 1190, SAO 194551[11]
B: HD 24071, HR 1189, SAO 194550[12]
Database references
SIMBADdata
HD 24072
HD 24071

f Eridani is a binary,[13] or possibly a triple, star system in the equatorial constellation of Eridanus, consisting of stars HD 24071 and HD 24072. They share a single Hipparcos catalogue entry, HIP 17797, but have separate Bright Star Catalogue listings, HR 1189 and 1190. f Eridani is the Bayer designation of the pair.

f Eridani is visible to the naked eye as a single star with a magnitude of 4.25.[14] HD 24071 has an apparent visual magnitude of 5.25 and HD 24072 a magnitude of 4.72.[2] As of 2009, the pair had an angular separation of 8.40″ along a position angle of 216°.[15] Both stars have an annual parallax shift 18.8 mas, which provides a distance estimate to the system of 173 light years. The pair are members of the Tucana-Horologium moving group, a 45 million year old set of stars that share a common motion through space.[2]

The brighter component, HD 24072, is a B-type main-sequence star with a classification of B9.5 Van.[5] The n suffix indicates "nebulous" absorption lines which are caused by its rapid rotation. It has a projected rotational velocity of 225 km/s.[9]

HD 24071 may itself be a spectroscopic binary. The visible component is an A-type main-sequence star with a stellar classification of A1 Va.[5] It is a suspected variable star of unknown type showing an amplitude of 0.05 magnitude,[6] and is a source of X-ray emission, which may originate from a companion of class G2-5V.[16]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Bell, Cameron P. M. et al. (November 2015), "A self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood", Monthly Notices of the Royal Astronomical Society 454 (1): 593–614, doi:10.1093/mnras/stv1981, Bibcode: 2015MNRAS.454..593B. 
  3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  4. ↑ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. 
  5. ↑ 5.0 5.1 5.2 5.3 Gray, R. O.; Garrison, R. F. (December 1987), "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", Astrophysical Journal Supplement 65: 581, doi:10.1086/191237, Bibcode: 1987ApJS...65..581G. 
  6. ↑ 6.0 6.1 Adelman, S. J. et al. (November 2000), "On the Variability of A0-A2 Luminosity Class III-V Stars", Information Bulletin on Variable Stars 4984: 1, Bibcode: 2000IBVS.4984....1A. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  8. ↑ Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K. 
  9. ↑ 9.0 9.1 9.2 Royer, F. et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics 393: 897–911, doi:10.1051/0004-6361:20020943, Bibcode: 2002A&A...393..897R. 
  10. ↑ "f Eri". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=f+Eri. 
  11. ↑ "HD 24072". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+24072. 
  12. ↑ "HD 24071". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+24071. 
  13. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  14. ↑ Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers 42 (2): 443. Bibcode: 2014JAVSO..42..443M. 
  15. ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M 
  16. ↑ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics 475 (2): 677–684, doi:10.1051/0004-6361:20077429, Bibcode: 2007A&A...475..677S. 



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