Astronomy:V1073 Scorpii

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Short description: Variable star in the constellation Scorpius
V1073 Scorpii
Scorpius constellation map.svg
Red circle.svg
Location of V1073 Scorpii (circled)
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas
Distanceapprox. 2,900 ly
(approx. 900 pc)
Absolute magnitude (MV)−6.8[6]
Details
Mass28[7]
19.7±1.0[8]
27.11±8.39[9] M☉
Radius36.0[6][3] R☉
Luminosity302,000[6] L☉
Surface gravity (log g)2.70[7]
2.65[3] cgs
Temperature20,800[9]
22,500[3] K
Rotational velocity (v sin i)47[7] km/s
Age4.2±0.3[8] Myr
Other designations
k Sco, V1073 Sco, CD−33°11706, HD 154090, HIP 83574, HR 6334, SAO 208377[10]
Database references
SIMBADdata

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 Lefèvre et al. (2009)[11]

This object is a massive supergiant star with a stellar classification of B0.7 Ia.[3] It is an α Cygni variable;[12] 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.[13][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.[14] 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.[15]

V1073 Sco has a 14th magnitude visual companion,[16] which is an unrelated background object according to its Gaia Data Release 2 parallax.[17]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 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. ↑ 3.0 3.1 3.2 3.3 3.4 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. doi:10.1051/0004-6361/200810319. Bibcode: 2009A&A...499..291K. 
  4. ↑ Samus, N. N. 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. ↑ 5.0 5.1 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. doi:10.1002/asna.200710776. Bibcode: 2007AN....328..889K. 
  6. ↑ 6.0 6.1 6.2 6.3 Crowther, P. A. et al. (2006). "Physical parameters and wind properties of galactic early B supergiants". Astronomy and Astrophysics 446 (1): 279–293. doi:10.1051/0004-6361:20053685. Bibcode: 2006A&A...446..279C. 
  7. ↑ 7.0 7.1 7.2 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. doi:10.1111/j.1365-2966.2010.16392.x. Bibcode: 2010MNRAS.404.1306F. 
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T. 
  9. ↑ 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 
  10. ↑ "9 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=9+Cet. 
  11. ↑ 11.0 11.1 Lefèvre, L. et al. (2009). "A systematic study of variability among OB-stars based on HIPPARCOS photometry". Astronomy and Astrophysics 507 (2): 1141. doi:10.1051/0004-6361/200912304. Bibcode: 2009A&A...507.1141L. https://hal.science/hal-03742152/file/aa12304-09.pdf. 
  12. ↑ 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. 
  13. ↑ Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society 331 (1): 45–59. doi:10.1046/j.1365-8711.2002.05150.x. Bibcode: 2002MNRAS.331...45K. 
  14. ↑ 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. Bibcode: 1997A&A...319..811B. 
  15. ↑ Peri, C. S. et al. (2012). "E-BOSS: An Extensive stellar BOw Shock Survey. I. Methods and first catalogue". Astronomy & Astrophysics 538: A108. doi:10.1051/0004-6361/201118116. Bibcode: 2012A&A...538A.108P. 
  16. ↑ 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. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M. 
  17. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.



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