Rho Tauri

ρ Tauri
	Location of ρ Tauri (circled)
Observation data; Epoch J2000.0 Equinox ICRS
Constellation	Taurus
Right ascension	04h 33m 50.91753s
Declination	+14° 50′ 39.9232″
Apparent magnitude (V)	4.66
Characteristics
Evolutionary stage	main sequence
Spectral type	A8V
U−B color index	+0.09
B−V color index	+0.24
Variable type	δ Scuti
Astrometry
Radial velocity (Rv)	+39.6 km/s
Proper motion (μ)	RA: 103.20 mas/yr ; Dec.: −26.48 mas/yr
Parallax (π)	20.61±0.57 mas
Distance	158 ± 4 ly ; (49 ± 1 pc)
Absolute magnitude (MV)	+1.26
Orbit
Period (P)	58.94±0.09 days
Semi-major axis (a)	0.48 au
Eccentricity (e)	0.31±0.16
Details
A
Mass	2.21 M☉
Radius	1.9 R☉
Age	630 Myr
B
Mass	2.12 M☉
Radius	1.72 R☉
Age	630 Myr
Other designations
	ρ Tau, 86 Tau, BD+14 720, FK5 1125, HD 28910, HIP 21273, HR 1444, SAO 94007
Database references
SIMBAD	data

Rho Tauri (ρ Tau, ρ Tauri) is a binary star in the constellation Taurus and a member of the Hyades star cluster. The system has an apparent magnitude of +4.66 and a combined spectral type of A8V. Since one stars (or both) is a Delta Scuti variable, the apparent magnitude varies by 0.010 magnitudes over a period of 1.61 hours.

Characteristics

This is a spectroscopic binary system. The two stars have an orbtial period of 58.94 days and a semi-major axis of 0.48 astronomical units. The primary has a mass of 2.21 solar masses and a radius of 1.90 solar radii, while the secondary has a mass of 2.12 solar masses and a radius of 1.72 solar radii.

Hyades, with ρ Tau appearing blue, left of center, marked with a red arrow
A blue band light curve for Rho Tauri, adapted from Horan (1979)

Notes

↑ Calculated with a distance (d) of 46.97 parsecs and an angular diameter (𝜃) of 0.377 mas using the equation R / R_☉ = 0.1075 • 𝜃 • d.
↑ Calculated with a distance (d) of 46.97 parsecs and an angular diameter (𝜃) of 0.341 mas using the equation R / R_☉ = 0.1075 • 𝜃 • d.

References

1 2 3 4 5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
1 2 3 4 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
↑ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
1 2 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
1 2 Solano, E.; Fernley, J. (April 1997), "Spectroscopic survey of delta Scuti stars. I. Rotation velocities and effective temperatures", Astronomy & Astrophysics Supplement Series, 122: 131–147, Bibcode:1997A&AS..122..131S, doi:10.1051/aas:1997329.
↑ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.
↑ Pizzolato, N.; et al. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics, 361: 614–628, Bibcode:2000A&A...361..614P.
1 2 3 4 De Furio, Matthew; Gardner, Tyler; Monnier, John; Meyer, Michael R.; Kratter, Kaitlin; Schaefer, Gail; Anugu, Narsireddy; Davies, Claire L.; Kraus, Stefan; Lanthermann, Cyprien; Le Bouquin, Jean-Baptiste; Ennis, Jacob (2022-12-01), "The Small Separation A-star Companion Population: First Results with CHARA/MIRC-X", The Astrophysical Journal, 941 (2): 118, arXiv:2211.01465, Bibcode:2022ApJ...941..118D, doi:10.3847/1538-4357/aca1ad, ISSN 0004-637X
↑ "rho Tau -- Variable Star of delta Sct type", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2014-12-28
1 2 Gebran, M.; et al. (November 2010), "Chemical composition of A and F dwarfs members of the Hyades open cluster", Astronomy and Astrophysics, 523: A71, arXiv:1006.5284, Bibcode:2010A&A...523A..71G, doi:10.1051/0004-6361/200913273, S2CID 7164596.
↑ Horan, S. (November 1979), "A photometric survey of the Hyades for delta Scuti variables", Astronomical Journal, 84: 1770–1774, Bibcode:1979AJ.....84.1770H, doi:10.1086/112607, retrieved 5 September 2022.

[9] Calculated with a distance (d) of 46.97 parsecs and an angular diameter (𝜃) of 0.377 mas using the equation R / R_☉ = 0.1075 • 𝜃 • d.

[10] Calculated with a distance (d) of 46.97 parsecs and an angular diameter (𝜃) of 0.341 mas using the equation R / R_☉ = 0.1075 • 𝜃 • d.

[aaa474_2_653-1] 1 2 3 4 5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600

[MERMILLIOD-2] 1 2 3 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.

[zorec2012-3] Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.

[aj74_375-4] 1 2 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.

[Solano1997-5] 1 2 Solano, E.; Fernley, J. (April 1997), "Spectroscopic survey of delta Scuti stars. I. Rotation velocities and effective temperatures", Astronomy & Astrophysics Supplement Series, 122: 131–147, Bibcode:1997A&AS..122..131S, doi:10.1051/aas:1997329.

[rgcrv-6] Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.

[aaa361_614-7] Pizzolato, N.; et al. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics, 361: 614–628, Bibcode:2000A&A...361..614P.

[De_Furio_2022-8] 1 2 3 4 De Furio, Matthew; Gardner, Tyler; Monnier, John; Meyer, Michael R.; Kratter, Kaitlin; Schaefer, Gail; Anugu, Narsireddy; Davies, Claire L.; Kraus, Stefan; Lanthermann, Cyprien; Le Bouquin, Jean-Baptiste; Ennis, Jacob (2022-12-01), "The Small Separation A-star Companion Population: First Results with CHARA/MIRC-X", The Astrophysical Journal, 941 (2): 118, arXiv:2211.01465, Bibcode:2022ApJ...941..118D, doi:10.3847/1538-4357/aca1ad, ISSN 0004-637X

[SIMBAD-11] "rho Tau -- Variable Star of delta Sct type", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2014-12-28

[aaa523_A71-12] 1 2 Gebran, M.; et al. (November 2010), "Chemical composition of A and F dwarfs members of the Hyades open cluster", Astronomy and Astrophysics, 523: A71, arXiv:1006.5284, Bibcode:2010A&A...523A..71G, doi:10.1051/0004-6361/200913273, S2CID 7164596.

[Horan-13] Horan, S. (November 1979), "A photometric survey of the Hyades for delta Scuti variables", Astronomical Journal, 84: 1770–1774, Bibcode:1979AJ.....84.1770H, doi:10.1086/112607, retrieved 5 September 2022.