Astronomy:Tau1 Lupi
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lupus |
| Right ascension | 14h 26m 08.22424s[2] |
| Declination | −45° 13′ 17.1315″[2] |
| Apparent magnitude (V) | 4.546[3] |
| Characteristics | |
| Spectral type | B2 IV[4][3] |
| B−V color index | −0.146[3] |
| Variable type | β Cep[5] |
| Astrometry | |
| Radial velocity (Rv) | −21.5±2.8[4] km/s |
| Proper motion (μ) | RA: −13.09[2] mas/yr Dec.: −14.67[2] mas/yr |
| Parallax (π) | 2.99 ± 0.21[2] mas |
| Distance | 1,090 ± 80 ly (330 ± 20 pc) |
| Absolute magnitude (MV) | −3.05[6] |
| Details | |
| Mass | 9.98±0.63[3] M☉ |
| Radius | 7.1[7] R☉ |
| Luminosity | 3,831[8] L☉ |
| Luminosity (bolometric) | 11,321[3] L☉ |
| Temperature | 15,273[8] K |
| Metallicity [Fe/H] | −0.39±0.16[9] dex |
| Rotational velocity (v sin i) | 30[10] km/s |
| Age | 20.8±0.9[11] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Tau1 Lupi, Latinized from τ1 Lupi, is a solitary[13] star in the southern constellation of Lupus. It is visible to the naked eye with an apparent visual magnitude of 4.5.[3] Based upon an annual parallax shift of only 2.99 mas as seen from Earth, it is located about 1,090 light years from the Sun. Tau1 Lupi may be a runaway star[11] having a peculiar velocity of 32.6±3.6 km/s.[4] It is a member of the Upper Centaurus–Lupus sub-group of the nearby Sco OB2 association.[14]
This is a B-type subgiant star with a stellar classification of B2 IV.[4][3] It was determined to be a Beta Cephei variable based on observations during 1955 at the Cape Observatory.[15] Tau1 Lupi shows a steady period of 0.17736934 days, corresponding to a frequency of 5.637953 cycles per day, with an amplitude of 0.035 in visual magnitude.[5][16] It has around 10[3] times the mass of the Sun and 7[7] times the Sun's radius.
The star shows an infrared excess, which is unusual for a non-emission star of this class. The inner edge of the dust lies at a distance of 980 AU from the star with a temperature of 190 K, and it extends outward to as much as 50,000 AU where the temperature drops to 40 K. This optically thin dust is not related to the pulsational behavior of the star.[10]
References
- ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Hohle, M. M. et al. (April 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.
- ↑ 4.0 4.1 4.2 4.3 Bobylev, V. V.; Bajkova, A. T. (August 2013), "Galactic kinematics from a sample of young massive stars", Astronomy Letters 39 (8): 532–549, doi:10.1134/S106377371308001X, Bibcode: 2013AstL...39..532B.
- ↑ 5.0 5.1 Cuypers, J. (June 1987), "New observations and frequency analysis of the Beta Cephei star Tau1 Lupi", Astronomy and Astrophysics Supplement Series 69 (3): 445–449, Bibcode: 1987A&AS...69..445C.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 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 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 8.0 8.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ Daszyńska-Daszkiewicz, J.; Niemczura, E. (April 2005), "Metallicity of mono- and multiperiodic β Cephei stars", Astronomy and Astrophysics 433 (3): 1031–1035, doi:10.1051/0004-6361:20040397, Bibcode: 2005A&A...433.1031D.
- ↑ 10.0 10.1 Aerts, C.; De Boeck, I.; Malfait, K.; De Cat, P. (July 1999), "HD 42927 and HD 126341: two pulsating B stars surrounded by circumstellar dust", Astronomy and Astrophysics 347: 524–531, Bibcode: 1999A&A...347..524A.
- ↑ 11.0 11.1 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.
- ↑ "tau01 Lup -- Variable Star of beta Cep type", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=tau01+Lup, retrieved 2017-03-10.
- ↑ 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.
- ↑ de Geus, E. J. et al. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", Astronomy and Astrophysics 216 (1–2): 44–61, Bibcode: 1989A&A...216...44D.
- ↑ Pagel, B. E. J. (1956), "Results of a search for bright β Cephei variables in the southern sky", Monthly Notices of the Royal Astronomical Society 116: 10, doi:10.1093/mnras/116.1.10, Bibcode: 1956MNRAS.116...10P.
- ↑ Stankov, Anamarija; Handler, Gerald (2005), "Catalog of Galactic β Cephei Stars", The Astrophysical Journal Supplement Series 158 (2): 193–216, doi:10.1086/429408, ISSN 0067-0049, Bibcode: 2005ApJS..158..193S.
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