Astronomy:Delta2 Telescopii
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Short description: Star in the constellation Telescopium
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 18h 32m 01.94437s[1] |
| Declination | −45° 45′ 26.5636″[1] |
| Apparent magnitude (V) | 5.05[2] |
| Characteristics | |
| Evolutionary stage | subgiant[3] |
| Spectral type | B3 IV/V[4] or B3 III[5] |
| U−B color index | −0.52[2] |
| B−V color index | −0.12[2] |
| Astrometry | |
| Proper motion (μ) | RA: +0.16[1] mas/yr Dec.: −10.23[1] mas/yr |
| Parallax (π) | 2.73 ± 0.26[1] mas |
| Distance | 1,200 ± 100 ly (370 ± 30 pc) |
| Absolute magnitude (MV) | −1.46[6] |
| Orbit[7] | |
| Period (P) | 21.7056 d |
| Eccentricity (e) | 0.22 |
| Periastron epoch (T) | 2,435,216.669 JD |
| Argument of periastron (ω) (secondary) | 12.7° |
| Semi-amplitude (K1) (primary) | 34.9 km/s |
| Details | |
| Mass | 7.6±0.1[8] M☉ |
| Radius | 7,2[3] R☉ |
| Luminosity (bolometric) | 5,129[9] L☉ |
| Surface gravity (log g) | 3.37[3] cgs |
| Temperature | 17,100[9] K |
| Rotational velocity (v sin i) | 0[10] or 45[5] km/s |
| Age | 39.8±7.6[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta2 Telescopii is a blue-white-hued binary star[7] system in the southern constellation of Telescopium. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.05.[2] The distance to this system, as determined with an annual parallax shift of 2.73 mas,[1] is roughly 1,200 light-years. At that distance, the visual magnitude of the star is diminished by an extinction of 0.36 due to interstellar dust.[6] The pair have an orbital period of 21.7 days and an eccentricity of 0.22.[7] For the merged stellar classification, Houk (1978) gives B3 IV/V,[4] while Levato (1975) lists a more evolved class of B3 III.[5] It appears to be a relatively young system, barely 40 million years old.[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 Fernie, J. D. (May 1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series 52: 7–22, doi:10.1086/190856, Bibcode: 1983ApJS...52....7F.
- ↑ 3.0 3.1 3.2 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.
- ↑ 4.0 4.1 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ↑ 5.0 5.1 5.2 Levato, H. (1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics 19: 91, Bibcode: 1975A&AS...19...91L.
- ↑ 6.0 6.1 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.
- ↑ 7.0 7.1 7.2 Pourbaix, D. et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics 424: 727–732, doi:10.1051/0004-6361:20041213, Bibcode: 2004A&A...424..727P.
- ↑ 8.0 8.1 8.2 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.
- ↑ 9.0 9.1 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.
- ↑ Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory (University of Kyoto), Bibcode: 1970crvs.book.....U.
- ↑ "del02 Tel". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=del02+Tel.
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