Delta Sextantis

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δ Sextantis
Observation data
Epoch J2000.0      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)
Details
Mass 2.58[5] M
Radius 2.3[6] R
Luminosity 82[7] L
Surface gravity (log g) 3.99±0.14[5] cgs
Temperature 10,899±371[5] K
Metallicity [Fe/H] −0.51[3] dex
Rotational velocity (v sin i) 152[8] km/s
Age 146[5] Myr
Other designations
δ Sex, 29 Sextantis, BD−02° 3155, FK5 1270, HD 90882, HIP 51362, HR 4116, SAO 137600.[9]
Database references
SIMBAD data

Delta Sextantis (δ Sex, δ Sextantis) is a solitary[10] 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[5] times the Sun's mass and 2.3[6] times the radius of the Sun. It is 146[5] million years old, with a projected rotational velocity of 152[8] km/s. The star radiates 82[7] times the solar luminosity from its outer atmosphere at an effective temperature of 10,899 K.[5]

References[edit]

  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", SIMBAD, Bibcode:1986EgUBV........0M. 
  3. ^ a b c 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, Bibcode:2003A&A...408.1065H, doi:10.1051/0004-6361:20030889. 
  4. ^ 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, arXiv:1503.03874Freely accessible, Bibcode:2015ApJS..217...29B, doi:10.1088/0067-0049/217/2/29, 29. 
  5. ^ a b c d e f g 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, arXiv:1501.03154Freely accessible, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146. 
  6. ^ a b 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: 521–524, arXiv:astro-ph/0012289Freely accessible, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451. 
  7. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037Freely accessible, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x. 
  8. ^ a b Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785Freely accessible, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224. 
  9. ^ "del Sex -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-12-14. 
  10. ^ 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, arXiv:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.