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13 Monocerotis

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Star in the constellation Monoceros
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13 Monocerotis
Location of 13 Monocerotis (circled red)
Observation data
Epoch J2000Equinox ICRS
Constellation Monoceros
Right ascension 06h 32m 54.22948s[1]
Declination 07°19′58.6942′′[1]
Apparentmagnitude(V) 4.498[2]
Characteristics
Spectraltype A0 Ib[2]
U−B color index −0.217[2]
B−V color index +0.007[2]
Variabletype 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±0.46mas [1]
Distance 780[5] pc
Absolutemagnitude(MV)−4.80[6]
Details
Mass 12.0[7] M☉
Radius 38 ± 4[8] [a] R☉
Luminosity 14,100+2,900
−2,400[8] L☉
Surface gravity (logg)2.15[2] cgs
Temperature 10,250±200[8] K
Metallicity [Fe/H]−0.18[9] dex
Rotational velocity (vsini)0[2] km/s
Age 16[7] Myr
Other designations
BD+071337, FK51174, GC8506, HIP31216, HR2385, HD46300, NSV16904, SAO114034
Database references
SIMBAD data

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.

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).[10]

13 Monocerotis has been used as a standard star for the A0 Ib spectral class.[11]

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.[12] All the bright A0 - A5 supergiants analysed using Hipparcos satellite data were found to be variable, but 13 Mon was the least variable.[13]

Notes

[edit ]
  1. ↑ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
    ( 5 , 772 10.250 ) 4 ⋅ 10 4.15 = 38 R ⊙ {\displaystyle {\sqrt {{\biggl (}{\frac {5,772}{10.250}}{\biggr )}^{4}\cdot 10^{4.15}}}=38\ R_{\odot }} {\displaystyle {\sqrt {{\biggl (}{\frac {5,772}{10.250}}{\biggr )}^{4}\cdot 10^{4.15}}}=38\ R_{\odot }}.

References

[edit ]
  1. 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:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
  2. 1 2 3 4 5 6 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.
  3. ↑ 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
  4. ↑ 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.
  5. 1 2 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.
  6. 1 2 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 .
  7. 1 2 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
  8. 1 2 3 Nurmakhametova, Shakhida T.; Umirova, Aziza B.; Vaidman, Nadezhda L.; Miroshnichenko, Anatoly S.; Khokhlov, Serik A.; Khokhlov, Azamat A.; Agishev, Damir T.; Alimbetova, Dina A. (2026年04月09日). "Effective Temperatures of BA-Type Supergiants from SED Fitting". Galaxies. 14 (2): 32. doi:10.3390/galaxies14020032 . ISSN 2075-4434.
  9. ↑ 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
  10. ↑ Van Den Bergh, S. (1966). "A study of reflection nebulae". Astronomical Journal. 71: 990. Bibcode:1966AJ.....71..990V. doi:10.1086/109995.
  11. ↑ 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.
  12. ↑ 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 .
  13. ↑ 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.

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