V1073 Scorpii

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V1073 Scorpii
Scorpius constellation map.svg
Red circle.svg
Location of V1073 Scorpii (circled)
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Scorpius
Right ascension 17h 04m 49.35254s [1]
Declination −34° 07′ 22.5483″ [1]
Apparent magnitude  (V)+4.87 [2]
Characteristics
Spectral type B0.7 Ia [3]
U−B color index −0.69 [2]
B−V color index +0.26 [2]
Variable type α Cyg [4]
Astrometry
Radial velocity (Rv)7.00 [5] km/s
Proper motion (μ)RA: +0.600 [1] mas/yr
Dec.: −2.015 [1] mas/yr
Parallax (π)1.1161±0.2097  mas [1]
Distance approx. 2,900  ly
(approx. 900  pc)
Absolute magnitude  (MV)−6.8 [6]
Details
Mass 28 [7]
19.7±1.0 [8]
27.11±8.39 [9]   M☉
Radius 36.0 [6] [3]   R☉
Luminosity 302,000 [6]   L☉
Surface gravity (log g)2.70 [7]
2.65 [3]   cgs
Temperature 20,800 [9]
22,500 [3]   K
Rotational velocity (v sin i)47 [7]  km/s
Age 4.2±0.3 [8]   Myr
Other designations
k Sco, V1073 Sco, CD −33°11706, HD 154090, HIP 83574, HR 6334, SAO 208377 [10]
Database references
SIMBAD data

V1073 Scorpii is a variable star in the constellation Scorpius. It has a non-Greek Bayer designation of k Scorpii. The star has a blue-white hue and is visible to the naked eye with an apparent visual magnitude that fluctuates around +4.87. [2] Parallax measurements yield a distance estimate of approximately 2,920  ly (896  pc ) from the Sun, and it is drifting further away with a radial velocity of +7 km/s. [5] It has an absolute magnitude of −6.8 [6]

A light curve for V1073 Scorpii, adapted from Lefevre et al. (2009) V1073ScoLightCurve.png
A light curve for V1073 Scorpii, adapted from Lefèvre et al. (2009)

This object is a massive supergiant star with a stellar classification of B0.7 Ia. [3] It was found to be a variable star in 1996, when the Hipparcos data was analysed. It was given its variable star designation in 1999. [12] It is an α Cygni variable; [13] a supergiant that pulsates erratically on a timescale of days to weeks with an amplitude of less than a tenth of a magnitude. A simplistic fitting of Hipparcos data suggests a periodicity of 1.6 days. [14] [11] The star is around 4.2 [8]  million years old and is a member of the Upper Scorpius subgroup of the Sco OB2 association. [15] V1073 Scorpii is considered a "runaway" star, showing a peculiar velocity of more than 37 km/s relative to its neighbourhood. [8] No bow shock has been detected from its motion through interstellar space. [16]

V1073 Sco has a 14th magnitude visual companion, [17] which is an unrelated background object according to its Gaia Data Release 2 parallax. [18]

References

  1. 1 2 3 4 5 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 . Gaia DR2 record for this source at VizieR.
  2. 1 2 3 4 Ducati, J. R. (2002). "Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. 1 2 3 4 5 Kraus, M.; et al. (2009). "Parameters of galactic early B supergiants. The influence of the wind on the interstellar extinction determination". Astronomy and Astrophysics. 499 (1): 291. Bibcode:2009A&A...499..291K. doi: 10.1051/0004-6361/200810319 .
  4. ↑ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  5. 1 2 Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv: 0705.0878 . Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID   119323941.
  6. 1 2 3 4 Crowther, P. A.; et al. (2006). "Physical parameters and wind properties of galactic early B supergiants". Astronomy and Astrophysics. 446 (1): 279–293. arXiv: astro-ph/0509436 . Bibcode:2006A&A...446..279C. doi:10.1051/0004-6361:20053685. S2CID   18815761.
  7. 1 2 3 Fraser, M.; et al. (2010). "Atmospheric parameters and rotational velocities for a sample of Galactic B-type supergiants". Monthly Notices of the Royal Astronomical Society. 404 (3): 1306. arXiv: 1001.3337 . Bibcode:2010MNRAS.404.1306F. doi: 10.1111/j.1365-2966.2010.16392.x . S2CID   118674151.
  8. 1 2 3 4 Tetzlaff, N.; et al. (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. arXiv: 1007.4883 . Bibcode:2011MNRAS.410..190T. doi: 10.1111/j.1365-2966.2010.17434.x . S2CID   118629873.
  9. 1 2 Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv: 1003.2335 , Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID   111387483
  10. ↑ "9 Cet". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-12-02.
  11. 1 2 Lefèvre, L.; et al. (2009). "A systematic study of variability among OB-stars based on HIPPARCOS photometry" (PDF). Astronomy and Astrophysics. 507 (2): 1141. Bibcode:2009A&A...507.1141L. doi: 10.1051/0004-6361/200912304 .
  12. ↑ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars" (PDF). Information Bulletin on Variable Stars. 4659: 1–27. Bibcode:1999IBVS.4659....1K . Retrieved 15 September 2025.
  13. ↑ Kazarovets, E. V.; et al. (1999). "The 74th Special Name-list of Variable Stars". Information Bulletin on Variable Stars. 4659: 1. Bibcode:1999IBVS.4659....1K.
  14. ↑ Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331 (1): 45–59. arXiv: astro-ph/0112194 . Bibcode:2002MNRAS.331...45K. doi: 10.1046/j.1365-8711.2002.05150.x . S2CID   10505995.
  15. ↑ Brown, A.G.A.; Verschueren, W. (1997). "High S/N Echelle spectroscopy in young stellar groups. II. Rotational velocities of early-type stars in SCO OB2". Astronomy and Astrophysics. 319: 811. arXiv: astro-ph/9608089 . Bibcode:1997A&A...319..811B.
  16. ↑ Peri, C. S.; et al. (2012). "E-BOSS: An Extensive stellar BOw Shock Survey. I. Methods and first catalogue". Astronomy & Astrophysics. 538: A108. arXiv: 1109.3689 . Bibcode:2012A&A...538A.108P. doi:10.1051/0004-6361/201118116. S2CID   62840857.
  17. ↑ Mason, Brian D.; et al. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 .
  18. ↑ 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 . Gaia DR2 record for this source at VizieR.
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