Astronomy:V773 Tauri
 Light curves for V773 Tauri. The upper panel shows the variability as seen by TESS.[1] The lower panel, adapted from Kenworthy et al.,[2] shows the eclipse seen in 2010. | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 14m 12.926s[3] |
| Declination | 28° 12′ 12.36″[3] |
| Apparent magnitude (V) | 10.59 to 10.95[4] |
| Characteristics | |
| Spectral type | K3Ve (Li)[5] |
| Variable type | Orion variable + BY Dra[4] |
| Astrometry | |
| Proper motion (μ) | RA: 6.540[3] mas/yr Dec.: −27.792[3] mas/yr |
| Parallax (π) | 8.3261 ± 0.1313 mas |
| Distance | 433.1 ± 7.5 ly (132.8±2.3 pc) |
| Orbit[2] | |
| Primary | V773 Tau AB |
| Companion | V773 Tau C |
| Period (P) | 624+83 −52 yr |
| Semi-major axis (a) | 1,013+93 −74 mas |
| Eccentricity (e) | 0.40+0.04 −0.05 |
| Inclination (i) | 97.3±0.6° |
| Longitude of the node (Ω) | 104.6±1.3° |
| Periastron epoch (T) | 1,740+26 −40 |
| Argument of periastron (ω) (secondary) | 107.8±4.5° |
| Orbit[2] | |
| Primary | V773 Tau A |
| Companion | V773 Tau B |
| Period (P) | 26.50±0.07 yr |
| Semi-major axis (a) | 117.7±0.86 mas |
| Eccentricity (e) | 0.104±0.009 |
| Inclination (i) | 69.25±0.40° |
| Longitude of the node (Ω) | 290.54±0.40° |
| Periastron epoch (T) | 2,010.11±0.12 |
| Argument of periastron (ω) (secondary) | 266.0±1.5° |
| Semi-amplitude (K1) (primary) | 6.50±0.50[6] km/s |
| Orbit[7] | |
| Primary | V773 Tau Aa |
| Companion | V773 Tau Ab |
| Period (P) | 51.1033±0.0018 d |
| Semi-major axis (a) | 2.809±0.033 mas |
| Eccentricity (e) | 0.2713±0.0066 |
| Inclination (i) | 68.5±1.6° |
| Longitude of the node (Ω) | 62.4±1.1° |
| Periastron epoch (T) | 53,059.75±0.28 MJD |
| Argument of periastron (ω) (secondary) | 5.6±2.2° |
| Semi-amplitude (K1) (primary) | 35.72±0.46 km/s |
| Semi-amplitude (K2) (secondary) | 42.9±1.3 km/s |
| Details | |
| Aa | |
| Mass | 1.55±0.11[7] M☉ |
| Radius | 2.22[8] R☉ |
| Luminosity | 2.56[8] L☉ |
| Surface gravity (log g) | 3.93[8] cgs |
| Temperature | 4,900[8] K |
| Age | 3±1[2] Myr |
| Ab | |
| Mass | 1.293±0.068[7] M☉ |
| Radius | 1.74[8] R☉ |
| Luminosity | 1.37[8] L☉ |
| Surface gravity (log g) | 4.08[8] cgs |
| Temperature | 4,740[8] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
V773 Tauri is a young, multiple star system in the central region[7] of Taurus, an equatorial constellation. This is a T Tauri-type variable star that ranges in apparent visual magnitude from 10.59 down to 10.95,[4] which is too faint to be viewed with the naked eye. Based on various estimates, the system is located at a distance of approximately 433 light years from the Sun. It lies near the dark cloud Lynds 1495.[7]
| Aa | |||||||||||||||
| Period = 51.1 d | |||||||||||||||
| Ab | |||||||||||||||
| Period = 26.5 yr | |||||||||||||||
| B(ab) | |||||||||||||||
| Period = 624 yr | |||||||||||||||
| C | |||||||||||||||
Hierarchy of orbits
This system was identified as a T Tauri star by A. E. Rydgren and associates in 1974.[10] Radio emission was detected from this source in 1983.[11] In 1993, it was discovered to be a double star with an angular separation of about 150 mas: the two components are designated A and B. Component A was found to be a double-lined spectroscopic binary with an orbital period of 51 days. In 2003 a third member of this group was located, component C,[7] at a separation of 256 mas from component A.
Orbital solutions for the A–B pair provide an unexpectedly high dynamic mass of 2.69±0.67 M☉ for component B, suggesting it too may be a binary system.[6] A single star with that much mass would have 17 times the luminosity of the Sun, which is inconsistent with the observed optical luminosity. Photometry of component B suggests it is experiencing extinction from dust along the line of sight. The component is variable in the K band, which is consistent with clumps or clouds of dust in orbit.[2]
In 2010, an extended eclipse was observed in the V773 Tauri system. This was interpreted as a circumbinary disk of component B passing in front of component A. The eclipse obscured 70% of the emission from component A and lasted 150 days.[2]
References
- ↑ MAST: Barbara A. Mikulski Archive for Space Telescopes, Space Telescope Science Institute, https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html, retrieved 8 December 2021.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Kenworthy, M. A. et al. (October 2022), "Eclipse of the V773 Tau B circumbinary disc", Astronomy & Astrophysics 666: A61, doi:10.1051/0004-6361/202243441, A61, Bibcode: 2022A&A...666A..61K.
- ↑ 3.0 3.1 3.2 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 4.0 4.1 4.2 Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ Herbig, G. H. (1977), "Radial velocities and spectral types of T Tauri stars", Astrophysical Journal 214: 747–758, doi:10.1086/155304, Bibcode: 1977ApJ...214..747H.
- ↑ 6.0 6.1 Boden, Andrew F. et al. (March 2012), "A Surprising Dynamical Mass for V773 Tau B", The Astrophysical Journal 747 (1): 17, doi:10.1088/0004-637X/747/1/17, 17, Bibcode: 2012ApJ...747...17B.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Torres, Rosa M. et al. (March 2012), "VLBA Determination of the Distance to nearby Star-forming Regions. V. Dynamical Mass, Distance, and Radio Structure of V773 Tau A", The Astrophysical Journal 747 (1): 18, doi:10.1088/0004-637X/747/1/18, 18, Bibcode: 2012ApJ...747...18T.
- ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 Boden, Andrew F. et al. (December 2007), "Dynamical Masses for Pre-Main-Sequence Stars: A Preliminary Physical Orbit for V773 Tau A", The Astrophysical Journal 670 (2): 1214–1224, doi:10.1086/521296, Bibcode: 2007ApJ...670.1214B.
- ↑ "HD 283447". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+283447.
- ↑ Rydgren, A. E. et al. (March 1976), "The nature of the objects of Joy: a study of the T Tauri phenomenon.", Astrophysical Journal Supplement Series 30: 307–336, doi:10.1086/190364, Bibcode: 1976ApJS...30..307R. See notes about HD 283447.
- ↑ Kutner, M. L. et al. (October 1986), "Detection of 6 CM radio emission from late-type PMS stars with weak chromospheric emission", Astronomical Journal 92: 895–897, doi:10.1086/114223, Bibcode: 1986AJ.....92..895K.
Further reading
- Umemoto, T. et al. (August 2009), Hagiwara, Yoshiaki; Fomalont, Ed; Tsuboi, Masato et al., eds., "Detection of a Radio Flare at Millimeter-Wavelengths from the X-ray T Tauri Star V773 Tau", Approaching Micro-Arcsecond Resolution with VSOP-2, proceedings of the conference held 3–7 December 2007, at ISAS/JAXA, Sagamihara, Kanagawa, Japan, Astrophysics and Technologies ASP Conference Series 402: p. 400, Bibcode: 2009ASPC..402..400U.
- Massi, M. et al. (March 2008), "Interacting coronae of two T Tauri stars: first observational evidence for solar-like helmet streamers", Astronomy and Astrophysics 480 (2): 489–494, doi:10.1051/0004-6361:20078637, Bibcode: 2008A&A...480..489M.
- Massi, M. et al. (July 2006), "Synchrotron emission from the T Tauri binary system V773 Tauri A", Astronomy and Astrophysics 453 (3): 959–964, doi:10.1051/0004-6361:20053535, Bibcode: 2006A&A...453..959M.
- Duchêne, G. et al. (July 2003), "No Fossil Disk in the T Tauri Multiple System V773 Tauri", The Astrophysical Journal 592 (1): 288–298, doi:10.1086/375624, Bibcode: 2003ApJ...592..288D.
- Tamazian, Vakhtang S. et al. (October 2002), "Preliminary Orbits and System Masses for Five Binary T Tauri Stars", The Astrophysical Journal 578 (2): 925–934, doi:10.1086/342621, Bibcode: 2002ApJ...578..925T.
- Massi, M. et al. (January 2002), "Periodic radio flaring on the T Tauri star V 773 Tauri", Astronomy and Astrophysics 382: 152–156, doi:10.1051/0004-6361:20011585, Bibcode: 2002A&A...382..152M.
- Tsuboi, Yohko et al. (August 1998), "ASCA Detection of a Superhot 100 Million K X-Ray Flare on the Weak-Lined T Tauri Star V773 Tauri", The Astrophysical Journal 503 (2): 894–901, doi:10.1086/306024, Bibcode: 1998ApJ...503..894T.
- Skinner, Stephen L. et al. (September 1997), "ASCA Observations of the Barnard 209 Dark Cloud and an Intense X-Ray Flare on V773 Tauri", The Astrophysical Journal 486 (2): 886–902, doi:10.1086/304561, Bibcode: 1997ApJ...486..886S.
- Skinner, S. L. (May 1996), "Time-Resolved X-ray Spectroscopy of the Weak-lined T Tauri Star V773 Tau", Bulletin of the American Astronomical Society 28: 884, Bibcode: 1996AAS...188.4008S.
- Welty, Alan D. (August 1995), "Discovery of a Pre-Main-Sequence Spectrscopic Binary: V773 Tauri", Astronomical Journal 110: 776, doi:10.1086/117562, Bibcode: 1995AJ....110..776W.
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