Astronomy:40 Leonis Minoris
Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
---|---|
Constellation | Leo Minor |
Right ascension | 10h 43m 01.88241s[1] |
Declination | +26° 19′ 32.0287″[1] |
Apparent magnitude (V) | 5.51±0.01[2] |
Characteristics | |
Evolutionary stage | main sequence star[3] |
Spectral type | A4 Vn[4] |
U−B color index | +0.19[5] |
B−V color index | +0.17[5] |
Astrometry | |
Radial velocity (Rv) | 10±4.3[6] km/s |
Proper motion (μ) | RA: −98.971[1] mas/yr Dec.: −65.543[1] mas/yr |
Parallax (π) | 21.2215 ± 0.0816[1] mas |
Distance | 153.7 ± 0.6 ly (47.1 ± 0.2 pc) |
Absolute magnitude (MV) | +2.23[7] |
Details | |
Mass | 1.69[8] M☉ |
Radius | 1.54±0.04[9] R☉ |
Luminosity | 14.3+1.8−1.6[3] L☉ |
Surface gravity (log g) | 4.30±0.04[9] cgs |
Temperature | 7834±108[10] K |
Metallicity [Fe/H] | −0.15[11] dex |
Rotational velocity (v sin i) | 211[12] km/s |
Age | 207[8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
40 Leonis Minoris (40 LMi) is a white hued star located in the northern constellation Leo Minor. It is rarely called 14 H. Leonis Minoris, which is the designation given by Polis astronomer Johann Hevelius.[13]
It has an apparent magnitude of 5.51,[2] making it faintly visible to the naked eye. The object is located relatively close at a distance of 154 light years based on Gaia DR3 parallax measurements[1] but is receding with a somewhat constrained heliocentric radial velocity of 10 km/s.[6] At 40 LMi's current distance, its brightness is diminished by only 0.02 magnitudes due to interstellar dust.[15]
40 LMi is a chemically peculiar A-type main-sequence star with a stellar classification of A4 Vn.[4] This indicates that it is an A4 dwarf with nebulous absorption lines due to rapid rotation. It has 1.69 times the mass of the Sun[8] and 1.54 times its girth.[9] It radiates 14.3 times the luminosity of the Sun[3] from its photosphere at an effective temperature of 7,834 K.[10] The star is estimated to be 207 million years old, having completed 54.6% of its main sequence lifetime.[3] 40 LMi is slightly metal deficient and spins rapidly with a projected rotational velocity of 211 km/s.[12]
This star was part of a 2005 survey regarding proper motions from the Hipparcos satellite.[16] Its proper motion varied, indicating that an unseen companion may cause it. This led to Peter P. Eggleton and Andrei Tokovinin classifying it as an astrometric binary.[17] There also 3 optical companions located near 40 LMi. Their relative positions and brightness are listed below.[18]
Companion | mv | PA (°) | Year | Sep. (″) |
---|---|---|---|---|
B | 12.6 | 108 | 2015 | 23.8 |
C | 13.5 | 72 | 2015 | 41.6 |
D | 13 | 285 | 2015 | 46.6 |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 3.2 3.3 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. Bibcode: 2012A&A...537A.120Z.
- ↑ 4.0 4.1 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. doi:10.1086/110819. ISSN 0004-6256. Bibcode: 1969AJ.....74..375C.
- ↑ 5.0 5.1 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. doi:10.1086/146706. ISSN 0004-637X. Bibcode: 1959ApJ...130..159O.
- ↑ 6.0 6.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 8.0 8.1 8.2 David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal 804 (2): 146. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D.
- ↑ 9.0 9.1 9.2 Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. ISSN 0004-6361. Bibcode: 1999A&A...352..555A.
- ↑ 10.0 10.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ Thevenin, F.; Vauclair, S.; Vauclair, G. (September 1986). "A new step towards the explanation of lithium-and beryllium-deficientF stars. I. The field stars.". Astronomy and Astrophysics 166: 216–224. ISSN 0004-6361. Bibcode: 1986A&A...166..216T.
- ↑ 12.0 12.1 Wolff, S.; Simon, T. (July 1997). "The Angular Momentum of Main Sequence Stars and Its Relation to Stellar Activity". Publications of the Astronomical Society of the Pacific 109: 759. doi:10.1086/133942. ISSN 0004-6280. Bibcode: 1997PASP..109..759W.
- ↑ 13.0 13.1 Verbunt, F.; van Gent, R. H. (June 2010). "The star catalogue of Hevelius". Astronomy and Astrophysics 516: A29. doi:10.1051/0004-6361/201014003. ISSN 0004-6361. Bibcode: 2010A&A...516A..29V.
- ↑ "40 LMi". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=40+LMi.
- ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G.
- ↑ Makarov, V. V.; Kaplan, G. H. (May 2005). "Statistical Constraints for Astrometric Binaries with Nonlinear Motion". The Astronomical Journal 129 (5): 2420–2427. doi:10.1086/429590. ISSN 0004-6256. Bibcode: 2005AJ....129.2420M.
- ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E.
- ↑ 18.0 18.1 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. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M.
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