Astronomy:Lambda Canis Majoris
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Short description: Star in the constellation Canis Majoris
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Canis Major |
| Right ascension | 06h 28m 10.20747s[1] |
| Declination | −32° 34′ 48.2455″[1] |
| Apparent magnitude (V) | +4.48[2] |
| Characteristics | |
| Spectral type | B4 V[3] |
| U−B color index | −0.61[2] |
| B−V color index | −0.17[2] |
| Astrometry | |
| Radial velocity (Rv) | +41.0±4.1[4] km/s |
| Proper motion (μ) | RA: −14.41[1] mas/yr Dec.: +25.21[1] mas/yr |
| Parallax (π) | 7.70 ± 0.16[1] mas |
| Distance | 424 ± 9 ly (130 ± 3 pc) |
| Absolute magnitude (MV) | −0.85[5] |
| Details | |
| Mass | 5.7±0.3[6] M☉ |
| Luminosity | 560[7] L☉ |
| Surface gravity (log g) | 3.93[8] cgs |
| Temperature | 16,300[3] K |
| Rotational velocity (v sin i) | 102±9[3] km/s |
| Age | 39.8±19.1[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Lambda Canis Majoris (λ Canis Majoris) is a solitary,[10] blue-white hued star in the constellation Canis Major. Lambda CMa is visible to the naked eye with an apparent visual magnitude of +4.48.[2] Based upon an annual parallax shift of 7.70 mas as seen from Earth,[1] this star is located about 424 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.14 due to interstellar dust.[5]
This is a B-type main-sequence star with a stellar classification of B4 V.[3] The star is roughly 40 million years old,[6] and is spinning with a projected rotational velocity of 102 km/s.[3] It has about 5.7[6] times the mass of the Sun and is radiating 560[7] times the Sun's luminosity at an effective temperature of 16,300 K.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Bragança, G. A. et al. (November 2012), "Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk", The Astronomical Journal 144 (5): 10, doi:10.1088/0004-6256/144/5/130, 130, Bibcode: 2012AJ....144..130B.
- ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 5.0 5.1 Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters 38 (11): 694–706, doi:10.1134/S1063773712110035, Bibcode: 2012AstL...38..694G.
- ↑ 6.0 6.1 6.2 6.3 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T.
- ↑ 7.0 7.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ Castelli, F. (November 1991), "Effective temperature and gravity c0 and beta indices for B-type stars", Astronomy and Astrophysics 251: 106, Bibcode: 1991A&A...251..106C.
- ↑ "lam CMa". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=lam+CMa.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
External links
- Kaler, James N. (March 8, 2013), "Theta and Lambda Canis Majoris", STARS (University of Illinois), http://stars.astro.illinois.edu/sow/thetacma.html, retrieved 2017-09-08.
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