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Delta Monocerotis

March 11, 2023

Delta Monocerotis, which is Latinized from δ Monocerotis, is a single star[12] in the constellation of Monoceros, positioned about a half degree south of the celestial equator. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.15.[2] The distance to this star is approximately 384 light years based on parallax.[7] It is drifting further away from the Sun with a radial velocity of about +15 km/s,[6] having come to within 88 light-years some 7.3 million years ago.[2] The star has an absolute magnitude of −1.20.[2]

Delta Monocerotis
Location of δ Monocerotis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Monoceros
Right ascension 07h 11m 51.860s[1]
Declination −00° 29′ 33.96″[1]
Apparent magnitude (V) 4.15[2]
Characteristics
Spectral type A2V[3] or A0IV[4]
U−B color index +0.04[5]
B−V color index +0.00[5]
Astrometry
Radial velocity (Rv)+15.0±4.1[6] km/s
Proper motion (μ) RA: +0.79[7] mas/yr
Dec.: +4.52[7] mas/yr
Parallax (π)8.49 ± 0.17 mas[7]
Distance384 ± 8 ly
(118 ± 2 pc)
Absolute magnitude (MV)−1.20[2]
Details
Mass2.4+0.43
−0.38[3] M☉
Luminosity350[8] L☉
Surface gravity (log g)3.5±0.25[3] cgs
Temperature9,462[8] K
Metallicity [Fe/H]0.00[9] dex
Rotational velocity (v sin i)175.5±1.3[10] km/s
Age405+135
−207[3] Myr
Other designations
δ Mon, 22 Monocerotis, BD−00°1636, FK5 1187, GC 9518, HD 55185, HIP 34769, HR 2714, SAO 134330, CCDM J07119-0030A, WDS J07119-0030A[11]
Database references
SIMBADdata

The Bright Star Catalogue assigns this star a stellar classification of A2V, suggesting this is an A-type main-sequence star.[3][13] However, Houk and Swift (1999) found a more evolved subgiant class of A0IV.[4] It has around 2.4 times the mass of the Sun and is an estimated 405 million years old.[3] The star has a high rate of spin with a projected rotational velocity of 175.5 km/s,[10] giving it an equatorial bulge that is 5% larger than the polar radius.[14] It is radiating 350 times the luminosity of the Sun from its photosphere at an effective temperature of 9,462 K.[8]

It has one reported visual companion, designated component B, at an angular separation of 32.0″ and visual magnitude 13.0.[15]

References

  1. ^ a b Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
  2. ^ a b c d e 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
  3. ^ a b c d e f Gullikson, Kevin; et al. (August 2016). "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars". The Astronomical Journal. 152 (2): 13. arXiv:1604.06456. Bibcode:2016AJ....152...40G. doi:10.3847/0004-6256/152/2/40. S2CID 119179065. 40.
  4. ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
  5. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  6. ^ a b 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.
  7. ^ a b c d 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
  8. ^ a b c Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID 55586789. Vizier catalog entry
  9. ^ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. S2CID 118345778. Vizier catalog entry
  10. ^ a b Díaz, C. G.; et al. (July 2011). "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum". Astronomy & Astrophysics. 531: A143. arXiv:1012.4858. Bibcode:2011A&A...531A.143D. doi:10.1051/0004-6361/201016386. S2CID 119286673.
  11. ^ "del Mon". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-29.{{cite web}}: CS1 maint: postscript (link)
  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. ^ Hoffleit, D.; Warren, W. H. (1995). "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.
  14. ^ van Belle, Gerard T. (March 2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review. 20 (1): 51. arXiv:1204.2572. Bibcode:2012A&ARv..20...51V. doi:10.1007/s00159-012-0051-2. S2CID 119273474.
  15. ^ Dommanget, J.; Nys, O. (2002). "VizieR Online Data Catalog: CCDM (Catalog of Components of Double & Multiple stars) (Dommanget+ 2002)". VizieR On-line Data Catalog: I/274. Originally Published in: Observations et Travaux 54. 1274. Bibcode:2002yCat.1274....0D. Vizier catalog entry

March 11, 2023
delta, monocerotis, which, latinized, from, monocerotis, single, star, constellation, monoceros, positioned, about, half, degree, south, celestial, equator, white, faintly, visible, naked, with, apparent, visual, magnitude, distance, this, star, approximately,. Delta Monocerotis which is Latinized from d Monocerotis is a single star 12 in the constellation of Monoceros positioned about a half degree south of the celestial equator It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4 15 2 The distance to this star is approximately 384 light years based on parallax 7 It is drifting further away from the Sun with a radial velocity of about 15 km s 6 having come to within 88 light years some 7 3 million years ago 2 The star has an absolute magnitude of 1 20 2 Delta MonocerotisLocation of d Monocerotis circled Observation dataEpoch J2000 Equinox J2000Constellation MonocerosRight ascension 07h 11m 51 860s 1 Declination 00 29 33 96 1 Apparent magnitude V 4 15 2 CharacteristicsSpectral type A2V 3 or A0IV 4 U B color index 0 04 5 B V color index 0 00 5 AstrometryRadial velocity Rv 15 0 4 1 6 km sProper motion m RA 0 79 7 mas yr Dec 4 52 7 mas yrParallax p 8 49 0 17 mas 7 Distance384 8 ly 118 2 pc Absolute magnitude MV 1 20 2 DetailsMass2 4 0 43 0 38 3 M Luminosity350 8 L Surface gravity log g 3 5 0 25 3 cgsTemperature9 462 8 KMetallicity Fe H 0 00 9 dexRotational velocity v sin i 175 5 1 3 10 km sAge405 135 207 3 MyrOther designationsd Mon 22 Monocerotis BD 00 1636 FK5 1187 GC 9518 HD 55185 HIP 34769 HR 2714 SAO 134330 CCDM J07119 0030A WDS J07119 0030A 11 Database referencesSIMBADdataThe Bright Star Catalogue assigns this star a stellar classification of A2V suggesting this is an A type main sequence star 3 13 However Houk and Swift 1999 found a more evolved subgiant class of A0IV 4 It has around 2 4 times the mass of the Sun and is an estimated 405 million years old 3 The star has a high rate of spin with a projected rotational velocity of 175 5 km s 10 giving it an equatorial bulge that is 5 larger than the polar radius 14 It is radiating 350 times the luminosity of the Sun from its photosphere at an effective temperature of 9 462 K 8 It has one reported visual companion designated component B at an angular separation of 32 0 and visual magnitude 13 0 15 References Edit a b Hog E et al 2000 The Tycho 2 catalogue of the 2 5 million brightest stars Astronomy and Astrophysics 355 L27 Bibcode 2000A amp A 355L 27H a b c d e 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 a b c d e f Gullikson Kevin et al August 2016 The Close Companion Mass ratio Distribution of Intermediate mass Stars The Astronomical Journal 152 2 13 arXiv 1604 06456 Bibcode 2016AJ 152 40G doi 10 3847 0004 6256 152 2 40 S2CID 119179065 40 a b Houk N Swift C 1999 Michigan catalogue of two dimensional spectral types for the HD Stars Michigan Spectral Survey 5 Bibcode 1999MSS C05 0H a b Mallama A 2014 Sloan Magnitudes for the Brightest Stars The Journal of the American Association of Variable Star Observers 42 2 443 Bibcode 2014JAVSO 42 443M Vizier catalog entry a b 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 c d Van Leeuwen F 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 Vizier catalog entry a b c Zorec J Royer F 2012 Rotational velocities of A type stars Astronomy amp Astrophysics 537 A120 arXiv 1201 2052 Bibcode 2012A amp A 537A 120Z doi 10 1051 0004 6361 201117691 S2CID 55586789 Vizier catalog entry Gontcharov G A 2012 Dependence of kinematics on the age of stars in the solar neighborhood Astronomy Letters 38 12 771 782 arXiv 1606 08814 Bibcode 2012AstL 38 771G doi 10 1134 S1063773712120031 S2CID 118345778 Vizier catalog entry a b Diaz C G et al July 2011 Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum Astronomy amp Astrophysics 531 A143 arXiv 1012 4858 Bibcode 2011A amp A 531A 143D doi 10 1051 0004 6361 201016386 S2CID 119286673 del Mon SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2020 08 29 a href Template Cite web html title Template Cite web cite web a CS1 maint postscript link 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 Hoffleit D Warren W H 1995 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 van Belle Gerard T March 2012 Interferometric observations of rapidly rotating stars The Astronomy and Astrophysics Review 20 1 51 arXiv 1204 2572 Bibcode 2012A amp ARv 20 51V doi 10 1007 s00159 012 0051 2 S2CID 119273474 Dommanget J Nys O 2002 VizieR Online Data Catalog CCDM Catalog of Components of Double amp Multiple stars Dommanget 2002 VizieR On line Data Catalog I 274 Originally Published in Observations et Travaux 54 1274 Bibcode 2002yCat 1274 0D Vizier catalog entry Retrieved from https en wikipedia org w index php title Delta Monocerotis amp oldid 1079514583, wikipedia, wiki, book, books, library,

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