F Eridani

HD 24071 and HD 24072
	Location of HD 24160 (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Eridanus
	HD 24072
Right ascension	03h 48m 35.87402s
Declination	−37° 37′ 12.5158″
Apparent magnitude (V)	4.721±0.009
	HD 24071
Right ascension	03h 48m 35.47769s
Declination	−37° 37′ 19.2124″
Apparent magnitude (V)	5.246±0.009
Characteristics
HD 24072
Spectral type	B9.5 Van
HD 24071
Spectral type	A1 Va
Variable type	suspected
Astrometry
HD 24072
Proper motion (μ)	RA: +81.136 mas/yr ; Dec.: −6.795 mas/yr
Parallax (π)	18.8093 ± 0.2220 mas
Distance	173 ± 2 ly ; (53.2 ± 0.6 pc)
Absolute magnitude (MV)	1.194±0.190
HD 24071
Proper motion (μ)	RA: +63.372 mas/yr ; Dec.: −8.121 mas/yr
Parallax (π)	18.7976 ± 0.0582 mas
Distance	173.5 ± 0.5 ly ; (53.2 ± 0.2 pc)
Absolute magnitude (MV)	1.719±0.190
Details
HD 24072
Mass	2.6 M☉
Radius	2.0 R☉
Luminosity	35 L☉
Surface gravity (log g)	4.26 cgs
Temperature	10.046 K
Rotational velocity (v sin i)	225 km/s
Age	45±4 Myr
HD 24071
Mass	2.1 M☉
Radius	1.7 R☉
Luminosity	20 L☉
Surface gravity (log g)	4.16 cgs
Temperature	9,503 K
Metallicity [Fe/H]	−1.47 dex
Rotational velocity (v sin i)	39 km/s
Age	45±4 Myr
Other designations
	f Eridani, CD−38 1297, HIP 17797, WDS J03486-3737
	HD 24072: HR 1190, SAO 194551
	HD 24071: HR 1189, SAO 194550
Database references
SIMBAD	data
	HD 24072
	HD 24071

f Eridani is a binary,^[10] 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.^[11] 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°.^[12] 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.^[4] The n suffix indicates "nebulous" absorption lines which are caused by its rapid rotation. It has a projected rotational velocity of 225 km/s.^[7]

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.^[4] It is a suspected variable star of unknown type showing an amplitude of 0.05 magnitude,^[5] and is a source of X-ray emission, which may originate from a companion of class G2-5V.^[13]

References

^ ^a ^b ^c ^d ^e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b ^c ^d ^e ^f ^g ^h 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, arXiv:1508.05955, Bibcode:2015MNRAS.454..593B, doi:10.1093/mnras/stv1981, S2CID 55297862.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b ^c ^d 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, Bibcode:1987ApJS...65..581G, doi:10.1086/191237.
^ ^a ^b 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.
^ ^a ^b ^c ^d ^e Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
^ ^a ^b ^c 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, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763.
^ "HD 24072". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-22.
^ "HD 24071". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-22.
^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ 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.
^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
^ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677–684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.

[GaiaDR3A-1] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[Bell2015-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h 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, arXiv:1508.05955, Bibcode:2015MNRAS.454..593B, doi:10.1093/mnras/stv1981, S2CID 55297862.

[GaiaDR3B-3] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[Gray1987-4] 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, Bibcode:1987ApJS...65..581G, doi:10.1086/191237.

[Adelman2000-5] 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.

[ticv8-6] Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.

[Royer2002-7] 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, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763.

[SIMBAD_A-8] "HD 24072". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-22.

[SIMBAD_B-9] "HD 24071". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-22.

[Eggleton2008-10] 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.

[sloan-11] 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.

[WDSC2014-12] Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920

[Schroeder2007-13] Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677–684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.

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F Eridani

References

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