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13 Monocerotis 
Summary
13 Monocerotis (13 Mon) is a class A0 Ib (white supergiant) star in the constellation Monoceros. Its apparent magnitude is 4.5 and it is approximately 780 parsecs (2,500 ly) away.
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 32m 54.22948s[1] |
| Declination | 07° 19′ 58.6942″[1] |
| Apparent magnitude (V) | 4.498[2] |
| Characteristics | |
| Spectral type | A0 Ib[2] |
| U−B color index | −0.217[2] |
| B−V color index | +0.007[2] |
| Variable type | suspected[3] |
| Astrometry | |
| Radial velocity (Rv) | +11.80[4] km/s |
| Proper motion (μ) | RA: -0.20[1] mas/yr Dec.: -3.48[1] mas/yr |
| Parallax (π) | 0.83 ± 0.46 mas[1] |
| Distance | 780[5] pc |
| Absolute magnitude (MV) | −4.80[6] |
| Details | |
| Mass | 12.0[7] M☉ |
| Radius | 34[6] R☉ |
| Surface gravity (log g) | 2.15[2] cgs |
| Temperature | 10,000[2] K |
| Metallicity [Fe/H] | −0.18[8] dex |
| Rotational velocity (v sin i) | 0[2] km/s |
| Age | 16[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
13 Mon lies within the Monoceros OB1 stellar association,[6] halfway between the Rosette Nebula and NGC 2264, at a distance of about 780 parsecs.[5] It is surrounded by a small reflection nebula listed as Van den Bergh 81 (VdB 81).[9]
13 Monocerotis has been used as a standard star for the A0 Ib spectral class.[10]
Extended photometry of 13 Monocerotis from 1997 to 2000 shows irregular variation of up to 0.04 magnitudes and also a slight trend to become fainter over the period.[11] All the bright A0 - A5 supergiants analysed using Hipparcos satellite data were found to be variable, but 13 Mon was the least variable.[12]
References edit
- ^ a b c d e 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. S2CID 18759600. Vizier catalog entry
- ^ a b c d e f g Firnstein, M.; Przybilla, N. (2012). "Quantitative spectroscopy of Galactic BA-type supergiants. I. Atmospheric parameters". Astronomy & Astrophysics. 543: A80. arXiv:1207.0308. Bibcode:2012A&A...543A..80F. doi:10.1051/0004-6361/201219034. S2CID 54725386.
- ^ Samus, N. N.; Durlevich, O. V.; 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. Vizier catalog entry
- ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- ^ a b Hovhannessian, R. Kh.; Hovhannessian, E. R. (2001). "Gas—Dust Shells around Some Early-Type Stars with an IR Excess (of Emission)". Astrophysics (English Translation of Astrofizika). 44 (4): 454. Bibcode:2001Ap.....44..454H. doi:10.1023/A:1014244720865. S2CID 118532665.
- ^ a b c Verdugo, E.; Talavera, A.; Gómez De Castro, A. I. (1999). "Understanding A-type supergiants. I. Ultraviolet and visible spectral atlas" (PDF). Astronomy and Astrophysics Supplement. 137 (2): 351. Bibcode:1999A&AS..137..351V. doi:10.1051/aas:1999487.
- ^ a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (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. S2CID 118629873. Vizier catalog entry
- ^ 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. S2CID 119257644. Vizier catalog entry
- ^ Van Den Bergh, S. (1966). "A study of reflection nebulae". Astronomical Journal. 71: 990. Bibcode:1966AJ.....71..990V. doi:10.1086/109995.
- ^ Morgan, W. W.; Roman, Nancy G. (1950). "Revised Standards for Supergiants on the System of the Yerkes Spectral Atlas". Astrophysical Journal. 112: 362. Bibcode:1950ApJ...112..362M. doi:10.1086/145351.
- ^ Adelman, Saul J. (2001). "Differential uvby Photometry of 13 Mon (A0 Ib)". Baltic Astronomy. 10 (3): 385. Bibcode:2001BaltA..10..385A. doi:10.1515/astro-2001-0305.
- ^ Adelman, S. J.; Albayrak, B. (1997). "On the Variability of Early A-Type Supergiants". Information Bulletin on Variable Stars. 4541: 1. Bibcode:1997IBVS.4541....1A.