Astronomy:Delta Sextantis
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Short description: Solitary star in the constellation Sextans
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Sextans |
| Right ascension | 10h 29m 28.70222s[1] |
| Declination | −02° 44′ 20.6862″[1] |
| Apparent magnitude (V) | +5.25[2] |
| Characteristics | |
| Spectral type | B9.5 V[3] |
| U−B color index | −0.12[2] |
| B−V color index | −0.04[2] |
| Astrometry | |
| Radial velocity (Rv) | 18.07±0.96[4] km/s |
| Proper motion (μ) | RA: −48.86[1] mas/yr Dec.: −13.43[1] mas/yr |
| Parallax (π) | 10.13 ± 0.23[1] mas |
| Distance | 322 ± 7 ly (99 ± 2 pc) |
| Absolute magnitude (MV) | +0.22[5] |
| Details | |
| Mass | 2.58[6] M☉ |
| Radius | 2.3[7] R☉ |
| Luminosity | 82[8] L☉ |
| Surface gravity (log g) | 3.99±0.14[6] cgs |
| Temperature | 10,899±371[6] K |
| Metallicity [Fe/H] | −0.51[3] dex |
| Rotational velocity (v sin i) | 152[9] km/s |
| Age | 146[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta Sextantis (δ Sex, δ Sextantis) is a solitary[11] star in the equatorial constellation of Sextans. With an annual parallax shift of 10.13 mas,[1] it lies at a distance of around 322 light years from the Sun. This star is faintly visible to the naked eye, having an apparent visual magnitude of +5.25.[2] According to the Bortle scale, that means it can be viewed from dark suburban skies.
This is a B-type main sequence star with a stellar classification of B9.5 V;[3] just shy of being a cooler A-type star. It is estimated to have 2.6[6] times the Sun's mass and 2.3[7] times the radius of the Sun. It is 146[6] million years old, with a projected rotational velocity of 152[9] km/s. The star radiates 82[8] times the solar luminosity from its outer atmosphere at an effective temperature of 10,899 K.[6]
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- ↑ 2.0 2.1 2.2 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", SIMBAD, Bibcode: 1986EgUBV........0M.
- ↑ 3.0 3.1 3.2 Hempel, M.; Holweger, H. (September 2003), "Abundance analysis of late B stars. Evidence for diffusion and against weak stellar winds", Astronomy and Astrophysics 408: 1065–1076, doi:10.1051/0004-6361:20030889, Bibcode: 2003A&A...408.1065H.
- ↑ Becker, Juliette C. et al. (April 2015), "Extracting Radial Velocities of A- and B-type Stars from Echelle Spectrograph Calibration Spectra", The Astrophysical Journal Supplement Series 217 (2): 13, doi:10.1088/0067-0049/217/2/29, 29, Bibcode: 2015ApJS..217...29B.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", 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.
- ↑ 9.0 9.1 Royer, F. et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R.
- ↑ "del Sex". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=del+Sex.
- ↑ Eggleton, P. P. et al. (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.
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