19 Cephei
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 05m 08.78995s[1] |
| Declination | +62° 16′ 47.3301″[1] |
| Apparent magnitude (V) | 5.08[2] |
| Characteristics | |
| Spectral type | O9Ib[3] |
| U−B color index | −0.91[2] |
| B−V color index | +0.06[2] |
| Astrometry | |
| Radial velocity (Rv) | −12.8±0.9[4] km/s |
| Proper motion (μ) | RA: −1.16[1] mas/yr Dec.: −2.96[1] mas/yr |
| Parallax (π) | 1.58 ± 0.19[1] mas |
| Distance | approx. 2,100 ly (approx. 630 pc) |
| Details | |
| Mass | 20[5] M☉ |
| Surface gravity (log g) | 3.40±0.08[6] cgs |
| Temperature | 32,983±1,428[6] K |
| Metallicity [Fe/H] | 0.06±0.08[6] dex |
| Rotational velocity (v sin i) | 53[3] km/s |
| Other designations | |
19 Cephei is a star in the northern circumpolar constellation of Cepheus.[7] This is a supergiant star[5] with a stellar classification of O9Ib.[3] It is a member of CepOB2, an OB association of massive stars located about 615 parsecs (2,010 ly) from the Sun.[5]
References
- 1 2 3 4 5 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:10.1051/0004-6361:20078357Vizier catalog entry
- 1 2 3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M
- 1 2 3 Simón-Díaz, S.; Herrero, A. (2014). "The IACOB project: I. Rotational velocities in northern Galactic O- and early B-type stars revisited. The impact of other sources of line-broadening". Astronomy & Astrophysics 562: A135. arXiv:1311.3360. Bibcode:2014A&A...562A.135S. doi:10.1051/0004-6361/201322758.
- ↑ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- 1 2 3 Villamariz, M. R.; et al. (June 2002), "Chemical composition of Galactic OB stars I. CNO abundances in O9 stars", Astronomy and Astrophysics 388: 940–956, arXiv:astro-ph/0204209, Bibcode:2002A&A...388..940V, doi:10.1051/0004-6361:20020400
- 1 2 3 Prugniel, P.; Vauglin, I.; Koleva, M. (2011). "The atmospheric parameters and spectral interpolator for the MILES stars". Astronomy & Astrophysics 531: A165. arXiv:1104.4952. Bibcode:2011A&A...531A.165P. doi:10.1051/0004-6361/201116769.
- ↑ "19 CEP (19 Cephei)". Retrieved 28 August 2014.
External links
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