Astronomy:Theta1 Sagittarii
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h 59m 44.17834s[1] |
| Declination | −35° 16′ 34.7049″[1] |
| Apparent magnitude (V) | 4.37[2] |
| Characteristics | |
| Spectral type | B3 IVp[3] |
| U−B color index | −0.67[2] |
| B−V color index | −0.15[2] |
| Astrometry | |
| Proper motion (μ) | RA: +5.60[1] mas/yr Dec.: −25.81[1] mas/yr |
| Parallax (π) | 6.29 ± 0.21[1] mas |
| Distance | 520 ± 20 ly (159 ± 5 pc) |
| Absolute magnitude (MV) | −1.63[4] |
| Orbit[5] | |
| Period (P) | 2.1051 d |
| Eccentricity (e) | 0.00 |
| Periastron epoch (T) | 2411140.645 JD |
| Argument of periastron (ω) (secondary) | 0.00° |
| Semi-amplitude (K1) (primary) | 15.9 km/s |
| Details | |
| θ1 Sgr A | |
| Mass | 6.6±0.1[6] M☉ |
| Radius | 5.6[7] R☉ |
| Luminosity (bolometric) | 2,271[8] L☉ |
| Temperature | 17,900[8] K |
| Rotational velocity (v sin i) | 73[3] km/s |
| Age | 32.8±5.0[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Theta1 Sagittarii (θ1 Sagittarii) is a close binary star[10] system in the zodiac constellation of Sagittarius. It is visible to the naked eye with an apparent visual magnitude of 4.37.[2] Based upon an annual parallax shift of 6.29 mas as seen from Earth,[1] this star is located around 520 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.24 due to interstellar dust.[11]
This is a single-lined spectroscopic binary with an orbital period of just 2.1 days in a circular orbit.[5] The visible member, component A, is a B-type subgiant star with a stellar classification of B3 IVp.[3] It is around 33[6] million years old and is spinning with a projected rotational velocity of 73 km/s.[3] The primary has 6.6[6] times the mass of the Sun and about 5.6[7] times the Sun's radius. It is radiating 2,271[8] times the solar luminosity from its photosphere at an effective temperature of 17,900 K.[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode: 1978A&AS...34....1N.
- ↑ 3.0 3.1 3.2 3.3 Levato, H. (1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics 19: 91, Bibcode: 1975A&AS...19...91L
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 5.0 5.1 Pourbaix, D. et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics 424 (2): 727–732, doi:10.1051/0004-6361:20041213, Bibcode: 2004A&A...424..727P.
- ↑ 6.0 6.1 6.2 6.3 Tetzlaff, N. et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T.
- ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 8.0 8.1 8.2 8.3 Hohle, M. M. et al. (2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten 331 (4): 349, doi:10.1002/asna.200911355, Bibcode: 2010AN....331..349H.
- ↑ "tet01 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=tet01+Sgr.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters 38 (11): 694–706, doi:10.1134/S1063773712110035, Bibcode: 2012AstL...38..694G.
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