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19 Monocerotis
Location of 19 Monocerotis (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Monoceros
Right ascension 07h 02m 54.77667s [1]
Declination −04° 14′ 21.2377″ [1]
Apparent magnitude (V) 5.00 [2]
Characteristics
Spectral type B2Vn(e) [3]or B1V [4]
U−B color index −0.93 [2]
B−V color index −0.20 [2]
Variable type β Cep [5]
Astrometry
Radial velocity (Rv)+24.80 [6] km/s
Proper motion (μ) RA: −5.05 [1]  mas/ yr
Dec.: +2.24 [1]  mas/ yr
Parallax (π)2.68 ± 0.22  mas [1]
Distance1,220 ± 100  ly
(370 ± 30  pc)
Absolute magnitude (MV)−2.85 [7]
Details
Mass12.3 [8]  M☉
Radius9±3 [9]  R☉
Luminosity4,817 [7]  L☉
Surface gravity (log g)3.662 [10]  cgs
Temperature25,400 [11]  K
Rotational velocity (v sin i)274±3 [9] km/s
Other designations
19 Mon, V637 Mon, BD−04°1788, FK5 2547, GC 9293, HD 52918, HIP 33971, HR 2648, SAO 134106 [3]
Database references
SIMBAD data

19 Monocerotis is a single, [12] variable star [5] in the equatorial constellation of Monoceros, located approximately 1,220  light years away from the Sun based on parallax. [1] It has the variable star designation V637 Monocerotis, while 19 Monocerotis is the Flamsteed designation. This object is visible to the naked eye as a faint, blue-white hued star with a baseline apparent visual magnitude of 5.00. [2] It is receding from the Earth with a heliocentric radial velocity of +25 km/s. [6]

A light curve for V637 Monocerotis, plotted from TESS data [13]

This massive, B-type main-sequence star has a stellar classification of B1 V. [4] It is a Beta Cephei variable, ranging from 5.01 to 4.96 magnitude with a period of 0.19 days. [5] Closer examination shows there are three frequencies present, consisting of 5.22994, 0.17017, and 4.88956 cycles per day. [9] At one point it was thought to be a marginal Be star, but this was not confirmed. [9] The star is spinning rapidly with a projected rotational velocity of 274 km/s. [9] It has 12.3 [8] times the mass of the Sun and is radiating 4,817 [7] times the Sun's luminosity from its photosphere at an effective temperature of 25,400 K. [11]

References

  1. ^ 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. S2CID  18759600. Vizier catalog entry
  2. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode: 2002yCat.2237....0D.
  3. ^ a b "19 Mon". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-30.
  4. ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode: 1995yCat.5050....0H.
  5. ^ a b c 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.
  6. ^ a b Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institution of Washington. Bibcode: 1953GCRV..C......0W. ISBN  9780598216885. LCCN  54001336.
  7. ^ a b c 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
  8. ^ 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
  9. ^ a b c d e Balona, L. A.; et al. (July 2002). "Short-period line profile and light variations in the Beta Cephei star 19 Monocerotis" (PDF). Monthly Notices of the Royal Astronomical Society. 333 (4): 952–960. Bibcode: 2002MNRAS.333..952B. doi: 10.1046/j.1365-8711.2002.05487.x.
  10. ^ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv: 1605.07384. Bibcode: 2016A&A...591A.118S. doi: 10.1051/0004-6361/201628497. S2CID  119258214.
  11. ^ a b Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv: 1003.2335. Bibcode: 2010AN....331..349H. doi: 10.1002/asna.200911355. S2CID  111387483. Vizier catalog entry
  12. ^ 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.
  13. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
Retrieved from " https://en.wikipedia.org/?title=19_Monocerotis&oldid=1234888368"
From Wikipedia, the free encyclopedia
19 Monocerotis
Location of 19 Monocerotis (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Monoceros
Right ascension 07h 02m 54.77667s [1]
Declination −04° 14′ 21.2377″ [1]
Apparent magnitude (V) 5.00 [2]
Characteristics
Spectral type B2Vn(e) [3]or B1V [4]
U−B color index −0.93 [2]
B−V color index −0.20 [2]
Variable type β Cep [5]
Astrometry
Radial velocity (Rv)+24.80 [6] km/s
Proper motion (μ) RA: −5.05 [1]  mas/ yr
Dec.: +2.24 [1]  mas/ yr
Parallax (π)2.68 ± 0.22  mas [1]
Distance1,220 ± 100  ly
(370 ± 30  pc)
Absolute magnitude (MV)−2.85 [7]
Details
Mass12.3 [8]  M☉
Radius9±3 [9]  R☉
Luminosity4,817 [7]  L☉
Surface gravity (log g)3.662 [10]  cgs
Temperature25,400 [11]  K
Rotational velocity (v sin i)274±3 [9] km/s
Other designations
19 Mon, V637 Mon, BD−04°1788, FK5 2547, GC 9293, HD 52918, HIP 33971, HR 2648, SAO 134106 [3]
Database references
SIMBAD data

19 Monocerotis is a single, [12] variable star [5] in the equatorial constellation of Monoceros, located approximately 1,220  light years away from the Sun based on parallax. [1] It has the variable star designation V637 Monocerotis, while 19 Monocerotis is the Flamsteed designation. This object is visible to the naked eye as a faint, blue-white hued star with a baseline apparent visual magnitude of 5.00. [2] It is receding from the Earth with a heliocentric radial velocity of +25 km/s. [6]

A light curve for V637 Monocerotis, plotted from TESS data [13]

This massive, B-type main-sequence star has a stellar classification of B1 V. [4] It is a Beta Cephei variable, ranging from 5.01 to 4.96 magnitude with a period of 0.19 days. [5] Closer examination shows there are three frequencies present, consisting of 5.22994, 0.17017, and 4.88956 cycles per day. [9] At one point it was thought to be a marginal Be star, but this was not confirmed. [9] The star is spinning rapidly with a projected rotational velocity of 274 km/s. [9] It has 12.3 [8] times the mass of the Sun and is radiating 4,817 [7] times the Sun's luminosity from its photosphere at an effective temperature of 25,400 K. [11]

References

  1. ^ 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. S2CID  18759600. Vizier catalog entry
  2. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode: 2002yCat.2237....0D.
  3. ^ a b "19 Mon". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-30.
  4. ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode: 1995yCat.5050....0H.
  5. ^ a b c 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.
  6. ^ a b Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institution of Washington. Bibcode: 1953GCRV..C......0W. ISBN  9780598216885. LCCN  54001336.
  7. ^ a b c 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
  8. ^ 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
  9. ^ a b c d e Balona, L. A.; et al. (July 2002). "Short-period line profile and light variations in the Beta Cephei star 19 Monocerotis" (PDF). Monthly Notices of the Royal Astronomical Society. 333 (4): 952–960. Bibcode: 2002MNRAS.333..952B. doi: 10.1046/j.1365-8711.2002.05487.x.
  10. ^ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv: 1605.07384. Bibcode: 2016A&A...591A.118S. doi: 10.1051/0004-6361/201628497. S2CID  119258214.
  11. ^ a b Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv: 1003.2335. Bibcode: 2010AN....331..349H. doi: 10.1002/asna.200911355. S2CID  111387483. Vizier catalog entry
  12. ^ 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.
  13. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
Retrieved from " https://en.wikipedia.org/?title=19_Monocerotis&oldid=1234888368"

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