Astronomy:7 Tauri

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Short description: Multiple star system in the constellation Taurus
7 Tauri
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Taurus
A
Right ascension  03h 34m 26.629s[1]
Declination +35° 27′ 51.86″[1]
Apparent magnitude (V) 6.58[2]
B
Right ascension  03h 34m 26.633s[3]
Declination +35° 27′ 52.17″[3]
Apparent magnitude (V) 6.84[2]
Characteristics
A
Spectral type A3V[4]
B−V color index +0.13[4]
B
Spectral type A3V[4]
B−V color index +0.13[4]
Astrometry
Radial velocity (Rv)+28.1[5] km/s
Proper motion (μ) RA: +9.908[1] mas/yr
Dec.: −28.201[1] mas/yr
Parallax (π)5.4993 ± 0.0587[1] mas
Distance593 ± 6 ly
(182 ± 2 pc)
Absolute magnitude (MV)+0.5/+0.6[4]
Orbit[6]
Period (P)522.16 yr
Semi-major axis (a)0.625″
Eccentricity (e)0.679
Details
A
Mass2.5[4] M☉
Radius9.0[7] R☉
Luminosity52[7] L☉
Temperature8,551[8] K
B
Mass2.5[4] M☉
Other designations
7 Tau, BD+23°473, HD 22091, HIP 16664, HR 1086[9]
Database references
SIMBADdata

7 Tauri is a multiple star in the northern constellation of Taurus. It has a combined apparent visual magnitude of 5.95,[10] so, according to the Bortle scale, it is faintly visible from suburban skies at night. Measurements made with the Gaia spacecraft show an annual parallax shift of 5.5 mas, which is equivalent to a distance of around 593 light years from the Sun.

7 Tauri is a binary star with two nearly equal components about 0.7″ apart, designated as A and B. The spectrum of each star matches a stellar classification of A7V.[4] 22″ away is a 10th-magnitude star, component C, which is itself a spectroscopic binary. In the past, these stars had been treated as a single system, but they are now known to have different proper motions and somewhat different distances.[4]

References

  1. ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (March 2002). "The Tycho double star catalogue". Astronomy & Astrophysics 384 (1): 180–189. doi:10.1051/0004-6361:20011822. ISSN 0004-6361. Bibcode: 2002A&A...384..180F. 
  3. ↑ 3.0 3.1 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 Tokovinin, A. A. (1998). "New spectroscopic components in six multiple systems". Astronomy Letters 24 (3): 288. Bibcode: 1998AstL...24..288T. 
  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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  6. ↑ Malkov, O. Yu. et al. (2012). "Dynamical Masses of a Selected Sample of Orbital Binaries". Astronomy & Astrophysics 546: 5. doi:10.1051/0004-6361/201219774. A69. Bibcode: 2012A&A...546A..69M. 
  7. ↑ 7.0 7.1 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  8. ↑ Stassun, Keivan G.; Oelkers, Ryan J.; Pepper, Joshua; Paegert, Martin; De Lee, Nathan; Torres, Guillermo; Latham, David W.; Charpinet, Stéphane et al. (2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal 156 (3): 102. doi:10.3847/1538-3881/aad050. Bibcode: 2018AJ....156..102S. 
  9. ↑ "7 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=7+Tau. 
  10. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 

Coordinates: Sky map 03h 34m 26.6s, +35° 27′ 52″



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