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42 Leonis Minoris

April 12, 2024

42 Leonis Minoris (42 LMi) is a solitary,[11] bluish-white hued star located in the northern constellation Leo Minor. It has a visual apparent magnitude of 5.35,[2] allowing it to be faintly seen with the naked eye. Parallax measurements place it at a distance of 412 light years.[1] The object has a heliocentric radial velocity of 12 km/s,[5] indicating that it is drifting away from the Solar System.

42 Leonis Minoris
Location of 42 Leo Minoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Leo Minor
Right ascension 10h 45m 51.8947s[1]
Declination +30° 40′ 56.307″[1]
Apparent magnitude (V) 5.35±0.01[2]
Characteristics
Spectral type B9 V[3]
U−B color index −0.16[4]
B−V color index −0.06[4]
Astrometry
Radial velocity (Rv)12±3.7[5] km/s
Proper motion (μ) RA: −20.344 mas/yr[1]
Dec.: −38.234 mas/yr[1]
Parallax (π)7.915 ± 0.0813 mas
Distance412 ± 4 ly
(126 ± 1 pc)
Absolute magnitude (MV)+0.02[6]
Details
Mass2.77±0.36[7] M☉
Radius3.29±0.11[7] R☉
Luminosity107[8] L☉
Surface gravity (log g)4±0.2[9] cgs
Temperature10,703±206[7] K
Rotational velocity (v sin i)145[10] km/s
Age69+199
−59[9] Myr
Other designations
42 LMi, AG+30°1079, BD+31°2180, FK5 407, GC 14798, HD 93152, HIP 52638, HR 4203, SAO 62236
Database references
SIMBADdata

42 LMi has a general stellar classification of B9 V,[3] indicating that it is an ordinary B-type main-sequence star. However, Cowley et al. (1969) gave a slightly cooler class of A1 Vn,[12] indicating that it is instead an A-type main-sequence star with 'nebulous' (broad) absorption lines due to rapid rotation. Nevertheless, it has 2.77 times the mass of the Sun and a radius of 3.3 R☉.[7] It radiates at 107 times the luminosity of the Sun[8] from its photosphere at an effective temperature of 10,703 K.[7] Its high luminosity and slightly enlarged diameter suggests that the object might be evolved. Like most hot stars, 42 LMi spins rapidly with a projected rotational velocity of 145 km/s.[10]

There are two optical companions located near this star. BD+31°2181 is a 7th magnitude K2 giant star separated 146″ away along a position angle of 174°.[13] An 8th magnitude companion has been detected at a distance of over 400 arcseconds along a position angle of 92°.[13] Both have no relation to 42 LMi and is just moving with it by coincidence.

An X-ray emission with a luminosity of 278.2×1020 W has been detected around the object. A-type stars are not expected to emmit X-rays, so it must be coming from an unseen companion.[14]

References edit

  1. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. ^ a b Osawa, Kiyoteru (July 1959). "Spectral Classification of 533 B8-A2 Stars and the Mean Absolute Magnitude of a0 V Stars". The Astrophysical Journal. 130: 159. Bibcode:1959ApJ...130..159O. doi:10.1086/146706. eISSN 1538-4357. ISSN 0004-637X.
  4. ^ a b Crawford, D. L. (February 1963). "U, b, v, and Hβ Photometry for the Bright B8- and B9-TYPE Stars". The Astrophysical Journal. 137: 530. Bibcode:1963ApJ...137..530C. doi:10.1086/147526. eISSN 1538-4357. ISSN 0004-637X.
  5. ^ a b Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889–896. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. ISSN 0004-6337.
  6. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
  7. ^ a b c d e Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881.
  8. ^ a b McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. eISSN 1365-2966. ISSN 0035-8711.
  9. ^ a b Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (25 July 2016). "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars". The Astronomical Journal. 152 (2): 40. arXiv:1604.06456. Bibcode:2016AJ....152...40G. doi:10.3847/0004-6256/152/2/40. eISSN 1538-3881.
  10. ^ a b Dworetsky, Michael M. (November 1974). "Rotational Velocities of A0 Stars". The Astrophysical Journal Supplement Series. 28: 101. Bibcode:1974ApJS...28..101D. doi:10.1086/190312. eISSN 1538-4365. ISSN 0067-0049.
  11. ^ Eggleton, P. P.; Tokovinin, A. A. (11 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. eISSN 1365-2966. ISSN 0035-8711.
  12. ^ Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (April 1969). "A study of the bright stars. I. A catalogue of spectral classifications". The Astronomical Journal. 74: 375. Bibcode:1969AJ.....74..375C. doi:10.1086/110819. ISSN 0004-6256.
  13. ^ a b Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.
  14. ^ Schröder, C.; Schmitt, J. H. M. M. (24 September 2007). "X-ray emission from A-type stars". Astronomy & Astrophysics. 475 (2): 677–684. Bibcode:2007A&A...475..677S. doi:10.1051/0004-6361:20077429. eISSN 1432-0746. ISSN 0004-6361.

April 12, 2024
leonis, minoris, solitary, bluish, white, hued, star, located, northern, constellation, minor, visual, apparent, magnitude, allowing, faintly, seen, with, naked, parallax, measurements, place, distance, light, years, object, heliocentric, radial, velocity, ind. 42 Leonis Minoris 42 LMi is a solitary 11 bluish white hued star located in the northern constellation Leo Minor It has a visual apparent magnitude of 5 35 2 allowing it to be faintly seen with the naked eye Parallax measurements place it at a distance of 412 light years 1 The object has a heliocentric radial velocity of 12 km s 5 indicating that it is drifting away from the Solar System 42 Leonis MinorisLocation of 42 Leo Minoris circled Observation dataEpoch J2000 Equinox J2000Constellation Leo MinorRight ascension 10h 45m 51 8947s 1 Declination 30 40 56 307 1 Apparent magnitude V 5 35 0 01 2 CharacteristicsSpectral type B9 V 3 U B color index 0 16 4 B V color index 0 06 4 AstrometryRadial velocity Rv 12 3 7 5 km sProper motion m RA 20 344 mas yr 1 Dec 38 234 mas yr 1 Parallax p 7 915 0 0813 masDistance412 4 ly 126 1 pc Absolute magnitude MV 0 02 6 DetailsMass2 77 0 36 7 M Radius3 29 0 11 7 R Luminosity107 8 L Surface gravity log g 4 0 2 9 cgsTemperature10 703 206 7 KRotational velocity v sin i 145 10 km sAge69 199 59 9 MyrOther designations42 LMi AG 30 1079 BD 31 2180 FK5 407 GC 14798 HD 93152 HIP 52638 HR 4203 SAO 62236Database referencesSIMBADdata42 LMi has a general stellar classification of B9 V 3 indicating that it is an ordinary B type main sequence star However Cowley et al 1969 gave a slightly cooler class of A1 Vn 12 indicating that it is instead an A type main sequence star with nebulous broad absorption lines due to rapid rotation Nevertheless it has 2 77 times the mass of the Sun and a radius of 3 3 R 7 It radiates at 107 times the luminosity of the Sun 8 from its photosphere at an effective temperature of 10 703 K 7 Its high luminosity and slightly enlarged diameter suggests that the object might be evolved Like most hot stars 42 LMi spins rapidly with a projected rotational velocity of 145 km s 10 There are two optical companions located near this star BD 31 2181 is a 7th magnitude K2 giant star separated 146 away along a position angle of 174 13 An 8th magnitude companion has been detected at a distance of over 400 arcseconds along a position angle of 92 13 Both have no relation to 42 LMi and is just moving with it by coincidence An X ray emission with a luminosity of 278 2 1020 W has been detected around the object A type stars are not expected to emmit X rays so it must be coming from an unseen companion 14 References edit a b c d Brown A G A et al Gaia collaboration 2021 Gaia Early Data Release 3 Summary of the contents and survey properties Astronomy amp Astrophysics 649 A1 arXiv 2012 01533 Bibcode 2021A amp A 649A 1G doi 10 1051 0004 6361 202039657 S2CID 227254300 Erratum doi 10 1051 0004 6361 202039657e Gaia EDR3 record for this source at VizieR a b Hog E Fabricius C Makarov V V Urban S Corbin T Wycoff G Bastian U Schwekendiek P Wicenec A March 2000 The Tycho 2 catalogue of the 2 5 million brightest stars Astronomy and Astrophysics 355 L27 L30 Bibcode 2000A amp A 355L 27H ISSN 0004 6361 a b Osawa Kiyoteru July 1959 Spectral Classification of 533 B8 A2 Stars and the Mean Absolute Magnitude of a0 V Stars The Astrophysical Journal 130 159 Bibcode 1959ApJ 130 159O doi 10 1086 146706 eISSN 1538 4357 ISSN 0004 637X a b Crawford D L February 1963 U b v and Hb Photometry for the Bright B8 and B9 TYPE Stars The Astrophysical Journal 137 530 Bibcode 1963ApJ 137 530C doi 10 1086 147526 eISSN 1538 4357 ISSN 0004 637X a b Kharchenko N V Scholz R D Piskunov A E Roser S Schilbach E November 2007 Astrophysical supplements to the ASCC 2 5 Ia Radial velocities of 55000 stars and mean radial velocities of 516 Galactic open clusters and associations Astronomische Nachrichten 328 9 889 896 arXiv 0705 0878 Bibcode 2007AN 328 889K doi 10 1002 asna 200710776 ISSN 0004 6337 Anderson E Francis Ch May 2012 XHIP An extended hipparcos compilation Astronomy Letters 38 5 331 346 arXiv 1108 4971 Bibcode 2012AstL 38 331A doi 10 1134 S1063773712050015 eISSN 1562 6873 ISSN 1063 7737 S2CID 119257644 a b c d e Stassun Keivan G et al 9 September 2019 The Revised TESS Input Catalog and Candidate Target List The Astronomical Journal 158 4 138 arXiv 1905 10694 Bibcode 2019AJ 158 138S doi 10 3847 1538 3881 ab3467 eISSN 1538 3881 a b McDonald I Zijlstra A A Watson R A 15 June 2017 Fundamental parameters and infrared excesses of Tycho Gaia stars Monthly Notices of the Royal Astronomical Society 471 1 770 791 arXiv 1706 02208 Bibcode 2017MNRAS 471 770M doi 10 1093 mnras stx1433 eISSN 1365 2966 ISSN 0035 8711 a b Gullikson Kevin Kraus Adam Dodson Robinson Sarah 25 July 2016 The Close Companion Mass ratio Distribution of Intermediate mass Stars The Astronomical Journal 152 2 40 arXiv 1604 06456 Bibcode 2016AJ 152 40G doi 10 3847 0004 6256 152 2 40 eISSN 1538 3881 a b Dworetsky Michael M November 1974 Rotational Velocities of A0 Stars The Astrophysical Journal Supplement Series 28 101 Bibcode 1974ApJS 28 101D doi 10 1086 190312 eISSN 1538 4365 ISSN 0067 0049 Eggleton P P Tokovinin A A 11 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 eISSN 1365 2966 ISSN 0035 8711 Cowley A Cowley C Jaschek M Jaschek C April 1969 A study of the bright stars I A catalogue of spectral classifications The Astronomical Journal 74 375 Bibcode 1969AJ 74 375C doi 10 1086 110819 ISSN 0004 6256 a b Mason Brian D Wycoff Gary L Hartkopf William I Douglass Geoffrey G Worley Charles E December 2001 The 2001 US Naval Observatory Double Star CD ROM I The Washington Double Star Catalog The Astronomical Journal 122 6 3466 3471 Bibcode 2001AJ 122 3466M doi 10 1086 323920 ISSN 0004 6256 Schroder C Schmitt J H M M 24 September 2007 X ray emission from A type stars Astronomy amp Astrophysics 475 2 677 684 Bibcode 2007A amp A 475 677S doi 10 1051 0004 6361 20077429 eISSN 1432 0746 ISSN 0004 6361 Retrieved from https en wikipedia org w index php title 42 Leonis Minoris amp oldid 1166369819, wikipedia, wiki, book, books, library,

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