Omega 2 Scorpio ( ω 2 Scorpii , ω 2 Sco ) is a star in the zodiac constellation Scorpio . Probably [10] is a variable star. It is a component of the visual double star Omega Scorpio; bright enough to be visible to the naked eye: the apparent magnitude is of +4.320. [2] The distance to this star estimated by the parallax measurement method [1] is about 291 light years . The apparent stellar magnitude of this star changes by 0.38 due to extinction by interstellar dust . [five]
| Omega 2 Scorpio | |||
|---|---|---|---|
| Star | |||
| Observational data ( Age J2000 ) | |||
| Right ascension | 16 h 07 m 24.32818 s [1] | ||
| Declination | -20 ° 52 ′ 07.5518 ″ [1] | ||
| Distance | |||
| Visible magnitude ( V ) | +4,320 [2] | ||
| Constellation | |||
| Astrometry | |||
| Radial velocity ( R v ) | −5.4 [3] km / s | ||
| Own movement (μ) | RA: +44.81 [1] Dec: −45.42 [1] | ||
| Parallax (π) | 11.22 ± 0.32 [1] mas | ||
| Absolute magnitude (V) | −0.62 [5] | ||
| Specifications | |||
| Spectral class | G6 / 8III [6] | ||
| Color Index ( B - V ) | +0.850 [2] | ||
| Color Index ( U - B ) | +0.494 [2] | ||
| physical characteristics | |||
| Weight | 3.27 [5] M ☉ | ||
| Radius | 15,6 [7] R ☉ | ||
| Age | 282 [5] million years | ||
| Temperature | 5363 ± 42 [8] K | ||
| Luminosity | 141 [9] L ☉ | ||
| Metallicity | +0.03 ± 0.05 [8] | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
Omega 2 Scorpio is a giant star of the spectral class G: G6 / 8III. [6] The age is estimated at 282 Ma, [5] the star is in the late stages of evolution, belongs to a thin disk and is at the stage of a horizontal branch . [11] The angular diameter of the star, measured by interferometry methods, is 1.63 ± 0.10 mas , [12] which, at a known distance from the object, corresponds to a radius 16 times greater than the solar one. [7] The mass exceeds the solar 3.27 times, [5] the luminosity is equal to 141 luminosity of the Sun. [9] The effective temperature of the outer part of the atmosphere is 5363 K. [eight]
Notes
- ↑ 1 2 3 4 5 6 van Leeuwen, F. (2007), " Validation of the new Hipparcos reduction ", Astronomy and Astrophysics T. 474 (2): 653–664 , DOI 10.1051 / 0004-6361: 20078357
- ↑ 1 2 3 4 Kozok, JR (September 1985), "Photometric observations of emission B-stars in the southern Milky Way", Astronomy and Astrophysics Supplement Series T. 61: 387–405
- ↑ Wilson, RE (1953), General Catalog of Stellar Radial Velocities , Carnegie Institute of Washington DC
- ↑ 1 2 3 4 5 Gaia Data Release 2 - 2018.
- ↑ 1 2 3 4 5 6 Takeda, Yoichi; Sato, Bun'ei & Murata, Daisuke (August 2008), " Stellar Parameters and Elemental Abundances of Late-G Giants ", Publications of the Astronomical Society of Japan T. 60 (4): 781–802 , DOI 10.1093 / pasj / 60.4.781
- ↑ 1 2 Houk, N. & Smith-Moore, M. (1988), Michigan Catalog of Two-dimensional Spectral Types for the HD Stars. Declinations -26 ° .0 to -12 ° .0 , vol. four
- ↑ 1 2 Lang, Kenneth R. (2006), Astrophysical formulae , vol. 1 (3 ed.), Astronomy and astrophysics library, Birkhäuser, ISBN 3-540-29692-1 , < https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 > . The value of the radius (R * ) is given by
- ↑ 1 2 3 Prugniel, P .; Vauglin, I. & Koleva, M. (2011), " The atmospheric parameters and spectral interpolator for the MILES stars ", Astronomy & Astrophysics T. 531: A165 , DOI 10.1051 / 0004-6361 / 201116769
- ↑ 1 2 McDonald, I .; Zijlstra, AA & Boyer, ML (2012), " Fundamental Parameters and Infrared Excesses of Hipparcos Stars ", Monthly Notices of the Royal Astronomical Society T. 427 (1): 343–57 , DOI 10.1111 / j.1365-2966.2012.21873 .x
- ↑ Sterken, C. (January 1977), "uvby Photometry of the Suspected Variable omega2 Sco", Information Bulletin on Variable Stars T. 1230: 1
- ↑ Afşar, M .; Sneden, C. & For, B.-Q. (July 2012), " Chemical Compositions of Thin-disk, High-metallicity Red Horizontal-branch Field Stars ", The Astronomical Journal T. 144 (1): 20, 20 , DOI 10.1088 / 0004-6256 / 144/1/20
- ↑ Richichi, A. & Percheron, I. (May 2002), " CHARM: A Catalog of High Angular Resolution Measurements ", Astronomy and Astrophysics T. 386: 492-503 , DOI 10.1051 / 0004-6361: 20020236
Links
- Kaler, James B. (September 9, 2016), Omega-1 and Omega-2 Scorpii , University of Illinois , < http://stars.astro.illinois.edu/sow/omegasco.html > . Retrieved September 26, 2016.