HD 146624

HD 146624 (d Scorpii) is a single,[3] white-hued star in the southern zodiac constellation of Scorpius. It is faintly visible to the naked eye, having an apparent visual magnitude of 4.80.[2] The distance to HD 146624 can be estimated from its annual parallax shift of 23.0 mas,[1] yielding a separation of 142 light years. At that distance, the visual magnitude is reduced by an extinction of 0.17 due to interstellar dust.[5] It is a member of the Beta Pictoris moving group, a set of ~12 million year old stars that share a common motion through space.[10]

This article is about d Scorpii. It is not to be confused with δ Scorpii.
HD 146624
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension  16h 18m 17.89900s[1]
Declination −28° 36′ 50.4721″[1]
Apparent magnitude (V) 4.80[2]
Characteristics
Spectral type A0 V[3]
B−V color index +0.008±0.018[2]
Astrometry
Radial velocity (Rv)−13.0±0.8[4] km/s
Proper motion (μ) RA: −31.971[1] mas/yr
Dec.: −101.295[1] mas/yr
Parallax (π)23.0018 ± 0.3267[1] mas
Distance142 ± 2 ly
(43.5 ± 0.6 pc)
Absolute magnitude (MV)1.14[5]
Details
Mass1.49[3] or 2.13±0.02[6] M☉
Radius1.60[7] R☉
Luminosity21.46+0.53
−0.51[6] L☉
Surface gravity (log g)3.99±0.13[8] cgs
Temperature9,441+109
−108[6] K
Metallicity [Fe/H]−0.27±0.12[8] dex
Rotational velocity (v sin i)39[6] km/s
Age10[3] Myr
Other designations
d Sco, CD−28° 12037, FK5 3288, HD 146624, HIP 79881, HR 6070, SAO 184301[9]
Database references
SIMBADdata

This is an A-type main-sequence star with a stellar classification of A0 V,[3] and is suspected to be chemically peculiar.[11][6] It is a young star, just 10[3] million years old, with a projected rotational velocity of 39 km/s.[6] The mass of the star is greater than the Sun's, with De Rosa et al. (2014) estimating 1.49[3] times the mass of the Sun, while Zorec and Royer (2012) gives a multiplier of 2.13±0.02.[6] It has 1.60[7] times the Sun's radius and shines with 21 times the Sun's luminosity from its photosphere at an effective temperature of 9,441 K.[6]

The star displays an infrared excess, suggesting a circumstellar disk of orbiting material. This has a mean temperature of 280 K, matching a disk radius of 4.20 AU.[7]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  3. De Rosa, R. J.; et al. (2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932.
  4. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  5. Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035.
  6. Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  7. Cotten, Tara H.; Song, Inseok (July 2016), "A Comprehensive Census of Nearby Infrared Excess Stars", The Astrophysical Journal Supplement Series, 225 (1): 24, arXiv:1606.01134, Bibcode:2016ApJS..225...15C, doi:10.3847/0067-0049/225/1/15, 15.
  8. Prugniel, Ph.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769.
  9. "HD 146624". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-03.
  10. Zuckerman, B.; Song, Inseok; Bessell, M. S.; Webb, R. A. (November 2001), "The β Pictoris Moving Group", The Astrophysical Journal, 562 (1): L87–L90, Bibcode:2001ApJ...562L..87Z, doi:10.1086/337968.
  11. Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars" (PDF), Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788.
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