Misplaced Pages

145 G. Canis Majoris (HD 56577) is a single K giant or supergiant star in the southern constellation of Canis Major. This star is Gould's 145th of Canis Major in his Uranometria Argentina. Kostjuk erroneously lists it as simply "145 CMa". SIMBAD follows this error in its object query result as "* 145 CMa – Star".

The properties and evolutionary state of 145 G. CMa are disputed, it being classed either as a young massive supergiant or a somewhat older and less massive giant. It has been given two MK spectral classifications: K3Ib (corresponding to a supergiant) and K4III (corresponding to a giant). Tezzlaff et al. gives a large mass of 7.8 M_☉ and a young age of 35 million years, while Earle Luck gives a smaller mass of 1.9 M_☉ and a higher age of 1.05 billion years. The effective temperature of the star is of 3,980 K, which gives it a orange hue typical of K-type stars.

Based on the assumption that it is a supergiant, 145 CMa has been given a large radius of 315 R_☉ and a luminosity of 23,660 L_☉. Assuming it is a giant, Earle Luck gives a much lower luminosity of 5,250 L_☉ with a corresponding radius of 156 R_☉. By the distance implied by its Gaia DR2 parallax, it would have a luminosity of 14,000 L_☉, rather high for a giant. An older measurement based on the Hipparcos distance of 435 parsecs (1,420 ly) give a lower luminosity of 5,960 L_☉.

The star is one component of a close double, the other being HD 56578 which on its own would be a faint naked-eye star. The two are separated by 27″. The two stars appear to be unrelated and the close alignment accidental, with HD 56578 being a much closer and less luminous Am star.

Notes

1. ^ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:

   ${\displaystyle {\sqrt {{\biggl (}{\frac {5,772}{3,939}}{\biggr )}^{4}\cdot 10^{3.72}}}=155.71\ R_{\odot }}$.

References

1. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. ^ Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
3. ^ Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
4. ^ Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
5. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
6. ^ Tetzlaff, N.; et al. (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, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
7. ^ Healy, Sarah; Horiuchi, Shunsaku; Colomer Molla, Marta; Milisavljevic, Dan; Tseng, Jeff; Bergin, Faith; Weil, Kathryn; Tanaka, Masaomi; Otero, Sebastián (2024-04-01). "Red supergiant candidates for multimessenger monitoring of the next Galactic supernova". Monthly Notices of the Royal Astronomical Society. 529 (4): 3630–3650. arXiv:2307.08785. Bibcode:2024MNRAS.529.3630H. doi:10.1093/mnras/stae738. ISSN 0035-8711.
8. De Medeiros, J. R.; et al. (2002), "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars", Astronomy and Astrophysics, 395: 97–98, arXiv:1312.3474, Bibcode:2002A&A...395...97D, doi:10.1051/0004-6361:20021214.
9. "HD 56577". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-06.
10. 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.
11. Gould, B. A., (2009) Uranometria Argentina, (Reprinted and updated by Pilcher, F.) Archived 2016-03-05 at the Wayback Machine
12. SIMBAD query * 145 CMa – Star
13. "The Colour of Stars". Australia National Telescope Facility. 6 March 2024. Retrieved 2024-05-27.
14. McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012-11-01). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. ISSN 0035-8711. 145 CMa's database entry at VizieR.
15. Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
16. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

v t e Constellation of Canis Major
Canis Major in Chinese astronomy List of stars in Canis Major
Stars	Bayer α (Sirius) β (Mirzam) γ (Muliphein) δ (Wezen) ε (Adhara) ζ (Furud) η (Aludra) θ ι κ λ μ ν ν ν ξ ξ ο ο π σ (Unurgunite) τ ω Flamsteed 10 11 12 15 17 26 27 29 Variable R W Z UW VY CX EZ FN FS FY LS NR V352 HR 2225 2318 2437 2447 2450 2758 2764 2766 2812 HD 43162 43197 (Amadioha) 45184 45364 47186 54879 Other RX J0720.4−3125 WASP-64 (Atakoraka) WISE 0713−2917 WR 7
Exoplanets ν Canis Majoris b HD 47536 b c HD 47186 b c HD 45364 b c HD 43197 b
Star clusters	NGC NGC 2204 NGC 2354 NGC 2360 NGC 2362 NGC 2374 Other Gaia 1 Messier 41
Nebulae NGC 2359 NGC 2361 Sh2-297
Galaxies	NGC 2207 2217 2227 2280 2283 2293 Other Canis Major Overdensity IC 2163
Astronomical events SN 1999ec SN 2003H
Category

• K-type giants
• K-type supergiants
• Canis Major
• Durchmusterung objects
• Gould objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects