Jump to content
Wikipedia The Free Encyclopedia

Omega Cassiopeiae

From Wikipedia, the free encyclopedia
Binary star system in constellation Cassiopeia
"},"ra":{"wt":"{{RA|01|56|00.02830}}<ref name=dr3/>"},"dec":{"wt":"{{DEC|+68|41|06.8639}}<ref name=dr3/>"},"appmag_v":{"wt":"+4.99<ref name=Eggleton2008/>"}},"i":2}},"\n",{"template":{"target":{"wt":"Starbox character\n ","href":"./Template:Starbox_character"},"params":{"wt":"B5&nbsp;III<ref name=apj694_2_1085/>"},"b-v":{"wt":"−0.09<ref name=Crawford1963/>"},"u-b":{"wt":"−0.41<ref name=Crawford1963/>"},"variable":{"wt":""}},"i":3}},"\n",{"template":{"target":{"wt":"Starbox astrometry\n ","href":"./Template:Starbox_astrometry"},"params":{"radial_v":{"wt":"{{Val|−24.8|4.2}}<ref name=deBruijne2012/>"},"prop_mo_ra":{"wt":"15.067<ref name=dr3/>"},"prop_mo_dec":{"wt":"−10.313<ref name=dr3/>"},"parallax":{"wt":"4.4802"},"p_error":{"wt":"0.0912"},"parallax_footnote":{"wt":"<ref name=dr3/>"},"absmag_v":{"wt":"+0.09<ref name=Gontcharov2012/>"}},"i":4}},"\n",{"template":{"target":{"wt":"Starbox orbit\n ","href":"./Template:Starbox_orbit"},"params":{"reference":{"wt":"<ref name=Pourbaix/>"},"period":{"wt":"<!--Period (in years)-->"},"period_unitless":{"wt":"69.92&nbsp;d"},"eccentricity":{"wt":"0.30"},"periastron":{"wt":"2420426.02&nbsp;JD"},"periarg":{"wt":"50"},"k1":{"wt":"29.6"}},"i":5}},"\n",{"template":{"target":{"wt":"Starbox detail\n ","href":"./Template:Starbox_detail"},"params":{"source":{"wt":""},"component1":{"wt":"ω Cas A"},"mass":{"wt":"3.5<ref name=TICv7/>"},"radius":{"wt":"2.7<ref name=TICv7/>"},"luminosity":{"wt":"178<ref name=TICv7/>"},"temperature":{"wt":"{{Val|12737|100|fmt=commas}}<ref name=Huang2010/>"},"gravity":{"wt":"4.1<ref name=TICv7/>"},"metal_fe":{"wt":""},"rotational_velocity":{"wt":"45.7<ref name=moiseeva2019/>"},"age_myr":{"wt":"232<ref name=Gontcharov2012/>"}},"i":6}},"\n",{"template":{"target":{"wt":"Starbox catalog\n ","href":"./Template:Starbox_catalog"},"params":{"names":{"wt":"{{odlist | B=ω&nbsp;Cas | F=46&nbsp;Cas | BD=+67°169 | FK5=2129 | HD=11529 | HIP=9009 | HR=548 | SAO=12038 | GC=}}<ref name=SIMBAD/>"}},"i":7}},"\n",{"template":{"target":{"wt":"Starbox reference\n ","href":"./Template:Starbox_reference"},"params":{"Simbad":{"wt":"ome+Cas"}},"i":8}},"\n",{"template":{"target":{"wt":"Starbox end","href":"./Template:Starbox_end"},"params":{},"i":9}}]}'>
ω Cassiopeiae
Location of ω Cassiopeiae (circled)
Observation data
Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation Cassiopeia [1]
Right ascension 01h 56m 00.02830s[2]
Declination +68°41′06.8639′′[2]
Apparentmagnitude(V) +4.99[3]
Characteristics
Spectraltype B5III[4]
U−B color index −0.41[5]
B−V color index −0.09[5]
Astrometry
Radial velocity (Rv)−24.8±4.2[6] km/s
Proper motion (μ) RA:15.067[2] mas/yr
Dec.:−10.313[2] mas/yr
Parallax (π)4.4802±0.0912mas [2]
Distance 730 ± 10ly
(223 ± 5pc)
Absolutemagnitude(MV)+0.09[7]
Orbit [8]
Period (P)69.92d
Eccentricity (e)0.30
Periastron epoch (T)2420426.02JD
Argument of periastron (ω)
(secondary)		50°
Semi-amplitude (K1)
(primary)		29.6km/s
Details
ω Cas A
Mass 3.5[9] M☉
Radius 2.7[9] R☉
Luminosity 178[9] L☉
Surface gravity (logg)4.1[9] cgs
Temperature 12,737±100[10] K
Rotational velocity (vsini)45.7[11] km/s
Age 232[7] Myr
Other designations
ωCas, 46Cas, BD+67°169, FK5 2129, HD 11529, HIP 9009, HR 548, SAO 12038[12]
Database references
SIMBAD data

Omega Cassiopeiae is a binary star [3] system in the northern constellation of Cassiopeia. Its name is a Bayer designation that is Latinized from ω Cassiopeiae, and abbreviated Omega Cas or ω Cas. This system has a combined apparent visual magnitude of +4.99,[3] which means it is a faint star but visible to the naked eye. Based upon an annual parallax shift of 4.48mas as seen from Earth,[2] this system is located roughly 730 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.16 due to interstellar dust.[7]

This is a single-lined spectroscopic binary star system with an orbital period of 69.92 days and an eccentricity of 0.30. The visible component has the spectrum of an evolved, B-type giant star with a stellar classification of B5 III.[4] It is a helium-weak star, a type of chemically peculiar star that displays abnormally weak absorption lines of helium for a star of its temperature.[13] Omega Cassiopeiae has an estimated 3.5 times the mass of the Sun and is radiating 178 times the Sun's luminosity from its photosphere at an effective temperature of around 12,737K .[10]

References

[edit ]
  1. ↑ 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. XHIP record for this object at VizieR .
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211 . Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940 . S2CID 244398875. Gaia DR3 record for this source at VizieR .
  3. 1 2 3 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 , S2CID 14878976.
  4. 1 2 van Belle, Gerard T.; von Braun, Kaspar (April 2009), "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars", The Astrophysical Journal, 694 (2): 1085–1098, arXiv:0901.1206 , Bibcode:2009ApJ...694.1085V, doi:10.1088/0004-637X/694/2/1085, S2CID 18370219.
  5. 1 2 Crawford, D. L. (February 1963), "U, b, v, and Hβ Photometry for the Bright B8- and B9-TYPE Stars", Astrophysical Journal, 137: 530, Bibcode:1963ApJ...137..530C, doi:10.1086/147526 .
  6. ↑ 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, S2CID 59451347, A61.
  7. 1 2 3 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, S2CID 119108982.
  8. ↑ Pourbaix, D.; et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics, 424: 727–732, arXiv:astro-ph/0406573 , Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
  9. 1 2 3 4 Stassun, Keivan G.; et al. (September 2018), "The TESS Input Catalog and Candidate Target List", The Astronomical Journal, 156 (3): 102, arXiv:1706.00495 , Bibcode:2018AJ....156..102S, doi:10.3847/1538-3881/aad050 , ISSN 0004-6256.
  10. 1 2 Huang, Wenjin; et al. (October 2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal, 722 (1): 605–619, arXiv:1008.1761 , Bibcode:2010ApJ...722..605H, doi:10.1088/0004-637X/722/1/605, S2CID 118532653.
  11. ↑ Moiseeva, A. V.; et al. (2019). "Fundamental Parameters of CP Stars Observed at the 6-m Telescope. I. Observations in 2009–2011". Astrophysical Bulletin. 74 (1): 62–65. Bibcode:2019AstBu..74...62M. doi:10.1134/S1990341319010061. S2CID 149673065.
  12. ↑ "ome Cas", SIMBAD , Centre de données astronomiques de Strasbourg , retrieved 2017年08月29日.
  13. ↑ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788 .

AltStyle によって変換されたページ (->オリジナル) /