32 Tauri

32 Tauri is the Flamsteed designation for a solitary^[12] star in the zodiac constellation of Taurus. It has a visual magnitude of 5.64,^[4] making it visible to the naked eye from suburban skies (according to the Bortle scale). The position of this star near the ecliptic plane means that it is subject to occultations by the Moon.^[13] Parallax measurements put it at a distance of 144 light years from the Sun.^[1] It is drifting further away with a radial velocity of +31.9^[5] km/s, having come to within 88.9 light-years some 759,000 years ago.^[2]

32 Tauri

Location of 32 Tauri (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Taurus
Right ascension	03h 56m 52.077s[1]
Declination	+22° 28′ 40.70″[1]
Apparent magnitude (V)	5.62[2]
Characteristics
Spectral type	F2IVs[3]
U−B color index	+0.00[4]
B−V color index	+0.345±0.004[2]
Astrometry
Radial velocity (Rv)	+31.90[5] km/s
Proper motion (μ)	RA: +70.674 mas/yr[1] Dec.: −114.026 mas/yr[1]
Parallax (π)	22.5957 ± 0.0385 mas[1]
Distance	144.3 ± 0.2 ly (44.26 ± 0.08 pc)
Absolute magnitude (MV)	2.42[6]
Details
Mass	2.04[7] M☉
Radius	2.75[7] R☉
Luminosity	15.4[7] L☉
Surface gravity (log g)	3.87[7] cgs
Temperature	6.901[7] K
Metallicity [Fe/H]	−0.19[8] dex
Rotational velocity (v sin i)	19.7[9] km/s
Age	2.1[10] Gyr
Other designations
BD+22°605, FK5 2283, HD 24740, HIP 18471, HR 1218, SAO 76339, Ross 33.[11]
Database references
SIMBAD	data

The spectrum of this star matches a stellar classification of F2IVs,^[3] with the luminosity class of IV indicating that this star has reached the subgiant stage and is in the process of evolving into a giant star. It has twice the mass of the sun with nearly three times the Sun's radius, but 15 times the Sun's luminosity^[7] and about half the Sun's age.^[10] The abundance of elements other than hydrogen and helium is lower in this star than in the Sun.^[10] The effective temperature of the star's outer atmosphere is 6901 K,^[7] giving it the white-hued glow of an F-type star.^[14]

References

1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
2. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
3. Gray, R. O.; et al. (April 2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal, 121 (4): 2148–2158, Bibcode:2001AJ....121.2148G, doi:10.1086/319956.
4. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.
5. Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
6. Paunzen, E.; et al. (July 2014), "Investigating the possible connection between λ Bootis stars and intermediate Population II type stars", Astronomy & Astrophysics, 567: 8, arXiv:1406.3936, Bibcode:2014A&A...567A..67P, doi:10.1051/0004-6361/201423817, S2CID 56332289, A67.
7. Stassun, Keivan G.; et al. (September 2018), "The TESS Input Catalog and Candidate Target List", The Astronomical Journal, 156 (3): 102, arXiv:1706.00495, Bibcode:2018AJ....156..102S, doi:10.3847/1538-3881/aad050, ISSN 0004-6256.
8. Gáspár, András; et al. (2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal, 826 (2): 171, arXiv:1604.07403, Bibcode:2016ApJ...826..171G, doi:10.3847/0004-637x/826/2/171, S2CID 119241004.
9. De Medeiros, J. R.; Alves, S.; Udry, S; Andersen, J; Nordström, B.; Mayor, M. (January 2014), "A catalog of rotational and radial velocities for evolved stars. V. Southern stars", Astronomy & Astrophysics, 561: 27, arXiv:1312.3474, Bibcode:2014A&A...561A.126D, doi:10.1051/0004-6361/201220762, S2CID 54046583
10. Casagrande, L.; et al. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics, 530 (A138): 21, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
11. "32 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-11-05.
12. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
13. Barry, T. D.; Blatchford, J. A. (May 1931), "Occultations of stars by the moon", Astronomical Journal, 41 (956): 80, Bibcode:1931AJ.....41...80B, doi:10.1086/105033.
14. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16.