Chi Ophiuchi: Difference between revisions
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<ref name=GaiaDR2>{{cite DR2|4323764712417428864}}</ref> |
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<ref name=gcvs>{{ |
<ref name=gcvs>{{cite journal |
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| title=General catalogue of variable stars: Version GCVS 5.1 |
| title=General catalogue of variable stars: Version GCVS 5.1 |
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| last1=Samus' | first1=N. N | last2=Kazarovets | first2=E. V |
| last1=Samus' | first1=N. N | last2=Kazarovets | first2=E. V |
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| last3=Durlevich | first3=O. V | last4=Kireeva | first4=N. N |
| last3=Durlevich | first3=O. V | last4=Kireeva | first4=N. N |
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| last5=Pastukhova | first5=E. N | journal=Astronomy Reports |
| last5=Pastukhova | first5=E. N | journal=Astronomy Reports |
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| volume=61 | issue=1 | pages=80 | year=2017 |
| volume=61 | issue=1 | pages=80 | year=2017 |
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| doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S }} Note: cataloged as 'ksi Oph'.</ref> |
| doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S }} Note: cataloged as 'ksi Oph'.</ref> |
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| last1=Abt | first1=H. A. | last2=Levy | first2=S. G. |
| last1=Abt | first1=H. A. | last2=Levy | first2=S. G. |
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| journal=Astrophysical Journal, Supplement Series |
| journal=Astrophysical Journal, Supplement Series |
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| volume=36 | pages=241–258 | date=February 1978 |
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| doi=10.1086/190498 | bibcode=1978ApJS...36..241A }}</ref> |
| doi=10.1086/190498 | bibcode=1978ApJS...36..241A }}</ref> |
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| doi=10.1051/0004-6361:20078357 }}</ref> |
| doi=10.1051/0004-6361:20078357 }}</ref> |
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<ref name=houk1978>{{cite |
<ref name=houk1978>{{cite book |
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| last1=Houk | first1=Nancy |
| last1=Houk | first1=Nancy |
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| last2=Smith-Moore | first2=M. |
| last2=Smith-Moore | first2=M. |
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| title=Michigan catalogue of two-dimensional spectral types for the HD stars |
| title=Michigan catalogue of two-dimensional spectral types for the HD stars |
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| volume=4 | |
| volume=4 | location=Ann Arbor | year=1978 |
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| publisher=Dept. of Astronomy, University of Michigan |
| publisher=Dept. of Astronomy, University of Michigan |
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| bibcode=1988mcts.book.....H }}</ref> |
| bibcode=1988mcts.book.....H }}</ref> |
Revision as of 15:31, 24 October 2019
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Ophiuchus |
Right ascension | 16h 27m 01.43499s[1] |
Declination | −18° 27′ 22.4938″[1] |
Apparent magnitude (V) | 4.22[2] (4.18 to 5.0)[3] |
Characteristics | |
Evolutionary stage | main sequence |
Spectral type | B2Vne[4] |
U−B color index | −0.75[5] |
B−V color index | +0.28[5] |
R−I color index | +0.22[5] |
Variable type | GCAS[3] + LERI[6] |
Astrometry | |
Radial velocity (Rv) | −19.0±2.1[7] km/s |
Proper motion (μ) | RA: −5.41[1] mas/yr Dec.: −21.12[1] mas/yr |
Parallax (π) | 6.21 ± 0.23 mas[1] |
Distance | 530 ± 20 ly (161 ± 6 pc) |
Absolute magnitude (MV) | −4.6[8] |
Details | |
Mass | 10.1±0.7[9] M☉ |
Radius | 12.61+0.32 −0.25[10] R☉ |
Luminosity | 245±10[10] L☉ |
Surface gravity (log g) | 4.13[8] cgs |
Temperature | 6432+64 −79[10] K |
Rotational velocity (v sin i) | 134[5] km/s |
Age | 22.5±2.6[9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Chi Ophiuchi, Latinized from χ Ophiuchi, is a variable star in the equatorial constellation of Ophiuchus.[11] It has a blue-white hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around 4.22.[2] The distance to this object, as determined from parallax measurements, is approximately 530 light years,[1] but it is moving closer to the Sun with a radial velocity of −19 km/s.[7] This star is a proper motion member of the Upper Scorpius sub-group in the Scorpius-Centaurus OB association; the nearest such co-moving association of massive stars to the Sun.[8]
This is a massive Be star with a stellar classification of B2Vne,[4] where the 'n' indicates "nebulous" lines due to rapid rotation. It is spinning with a projected rotational velocity of 144 km/s. As the critical velocity for the star is 477 km/s, the inclination angle of its poles must be small; estimated as ~20°.[12] It is a Gamma Cassiopeiae variable with an amplitude of 0.15 magnitude.[13] The brightness has been measured varying from magnitude 4.18 down to 5.0.[3]
Chi Ophiuchi is 22.5[9] million years old with 10.1[9] times the mass of the Sun. It has 12.6[10] times the Sun's radius and is radiating 245[10] times the luminosity of the Sun from its photosphere at an effective temperature of 6,432 K.[10] A weak magnetic field has been detected in the chromosphere of this star.[14] It is being orbited by a symmetrical disk of ejected gas extending out to 0.52 AU (112 R☉),[12] and excess radio and infrared emission has been detected from this structure.[15]
Abt and Levy (1978) cataloged Chi Ophiuchi as a single-lined spectroscopic binary with a period of 138.8 days and an eccentricity of 0.44, although the orbital elements are considered marginal.[16] Eggleton and Tokovinin (2008) list it as a single star.[17]
References
- ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- ^ a b 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.
- ^ a b c Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. Note: cataloged as 'ksi Oph'.
- ^ a b Houk, Nancy; Smith-Moore, M. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 4. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode:1988mcts.book.....H.
- ^ a b c d Hoffleit, D.; Warren, Jr., W. H. "The Bright Star Catalogue" (5th Revised ed.). CDS. Retrieved 2019-10-24. HR 6118, database entry.
- ^ Watson, C. L. (2006). "The International Variable Star Index (VSX)". The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23-25. 25: 47. Bibcode:2006SASS...25...47W.
- ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- ^ a b c de Geus, E. J.; et al. (June 1989). "Physical parameters of stars in the Scorpio-Centaurus OB association". Astronomy and Astrophysics. 216 (1–2): 44–61. Bibcode:1989A&A...216...44D.
- ^ a b c d Tetzlaff, N.; et al. (January 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.
- ^ a b c d e f 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.
- ^ a b "chi Oph". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved January 12, 2011.
- ^ a b Tycner, C.; et al. (December 2008). "Constraining the Physical Parameters of the Circumstellar Disk of χ Ophiuchi". The Astrophysical Journal. 689 (1): 461–470. arXiv:0807.3971. Bibcode:2008ApJ...689..461T. doi:10.1086/592097.
- ^ Adelman, S. J.; et al. (December 2000). "On the Variability of O4-B5 Luminosity Class III-V Stars". Information Bulletin on Variable Stars. 5008: 1. Bibcode:2000IBVS.5008....1A.
- ^ Hubrig, S.; et al. (December 2007). "Evidence for weak magnetic fields in early-type emission stars". Astronomische Nachrichten. 328 (10): 1133. arXiv:0711.2085. Bibcode:2007AN....328.1133H. doi:10.1002/asna.200710877.
- ^ Taylor, A. R.; et al. (October 1987). "Radio detection of the Be star psi Persei". Monthly Notices of the Royal Astronomical Society. 228: 811–817. Bibcode:1987MNRAS.228..811T. doi:10.1093/mnras/228.4.811.
- ^ Abt, H. A.; Levy, S. G. (February 1978). "Binaries among B2 - B5 IV, V absorption and emission stars". Astrophysical Journal, Supplement Series. 36: 241–258. Bibcode:1978ApJS...36..241A. doi:10.1086/190498.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.