Rho Tauri (ρ Tau, ρ Tauri) is a binary star[8] in the constellation Taurus and a member of the Hyades star cluster.[10] The system has an apparent magnitude of +4.66[2] and a combined spectral type of A8V.[4] Since one stars (or both) is a Delta Scuti variable,[10] the apparent magnitude varies by 0.010 magnitudes over a period of 1.61 hours.[5]
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 33m 50.91753s[1] |
| Declination | +14° 50′ 39.9232″[1] |
| Apparent magnitude (V) | 4.66[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A8V[4] |
| U−B color index | +0.09[2] |
| B−V color index | +0.24[2] |
| Variable type | δ Scuti[5] |
| Astrometry | |
| Radial velocity (Rv) | +39.6[6] km/s |
| Proper motion (μ) | RA: 103.20[1] mas/yr Dec.: −26.48[1] mas/yr |
| Parallax (π) | 20.61±0.57 mas[1] |
| Distance | 158 ± 4 ly (49 ± 1 pc) |
| Absolute magnitude (MV) | +1.26[7] |
| Orbit[8] | |
| Period (P) | 58.94±0.09 days |
| Semi-major axis (a) | 0.48 au |
| Eccentricity (e) | 0.31±0.16 |
| Details[8] | |
| A | |
| Mass | 2.21 M☉ |
| Radius | 1.9[a] R☉ |
| Age | 630 Myr |
| B | |
| Mass | 2.12 M☉ |
| Radius | 1.72[b] R☉ |
| Age | 630 Myr |
| Other designations | |
| ρ Tau, 86 Tau, BD+14 720, FK5 1125, HD 28910, HIP 21273, HR 1444, SAO 94007[9] | |
| Database references | |
| SIMBAD | data |
Characteristics
editThis 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.[8]
Hyades, with ρ Tau appearing blue, left of center, marked with a red arrow
Notes
editReferences
edit- 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- 1 2 3 4 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.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.