145 G. Canis Majoris

Star in the constellation Canis Major Canis Major constellation map.svg center 280 right Red circle.svg 10 145 G. Canis Majoris 118 632 Location of 145 G. Canis Majoris (circled in red) J2000 Canis Major 07 16 36.83456 -23 18 56.1383 4.79 K3Ib- or K4III 1.710 +28.05 0.42 −3.816 +3.896 1.2155 0.0998 −4.03 7.8 0.5 315 23,660 3,986 0.70 0.03 7.4 1.0 35.4 2.0 145 G. CMa −23°5189 56577 35210 2764 173349 J07166-2319A 3503 HD+56577 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.Gould, B. A., (2009) Uranometria Argentina, (Reprinted and updated by Pilcher, F.) SIMBAD erroneously lists the star in its object query result as "* 145 CMa – Star".SIMBAD query * 145 CMa – Star Stellar properties The spectral type of 145 G. Canis Majoris has been given as K4III in 1978, with the luminosity class "III" corresponding to a giant star. In 1989, the spectral type was revised to K3Ib, with a luminosity class Ib suggesting the star is at the lower luminosity range of supergiant stars. Measurement of stellar properties such as radius, luminosity and mass depend on the star's distance, which is not well-known. The Hipparcos mission measured a parallax of 2.30 0.52 mas, resulting in a distance of 1400 300 commas ly. Based on this distance, a luminosity 5,250 times that of the Sun () was calculated. From the luminosity and a temperature of 3937 141 commas K, a radius of logLT 3.72 0 3937 141 solar radius y y is obtained,radius1 Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K: . and a mass and age of 1.90 y and 1.05 Gyr have been obtained using the stellar parameters and isochrones. Those values are consistent with the star being a giant. However, parallax measurements by the Gaia spacecraft suggest the star is more distant than previously thought, hence has higher luminosity, radius and mass. A radius of 315 and a luminosity of 23,660 have been derived using the Gaia DR3 distance, suggesting the star is indeed a supergiant. At the Gaia DR2 parallax, the star should have a luminosity of 14,000, also rather high for a giant. Values for the mass and age at the Gaia distance have not been computed yet, but a 2012 study give 7.8 0.5 solar mass and 35.4 2.0 Myr. The effective temperature of the star is around 4,000K, which gives it an orange hue typical of K-type stars.The Colour of Stars https://www.atnf.csiro.au/outreach/education/senior/astrophysics/photometry_colour.html Australia National Telescope Facility 6 March 2024 2024-05-27 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 References HD 56577 2019-01-06 5618016960635836928 5618016960638976896 5618018438104581888 HIP 35210 2020Ap&SS.365..112M Distance scale for high-luminosity stars in OB associations and in field with Gaia DR2. Spurious systematic motions Melnik A. M. Dambis A. K. Astrophysics and Space Science 2020 365 7 112 10.1007/s10509-020-03827-0 2006.14649 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 10.1093/mnras/stae738 free 0035-8711 2307.08785 2024MNRAS.529.3630H . 2001AJ....122.3466M The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog Mason Brian D. Wycoff Gary L. Hartkopf William I. Douglass Geoffrey G. Worley Charles E. The Astronomical Journal 2001 122 6 3466 10.1086/323920 The Perkins catalog of revised MK types for the cooler stars Keenan Philip C. McNeil Raymond C. Astrophysical Journal Supplement Series 71 245 1989 . 1989ApJS...71..245K 10.1086/191373 . Eggleton P. P. Tokovinin A. A. A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 389 2 869–879 September 2008 2008MNRAS.389..869E 0806.2878 10.1111/j.1365-2966.2008.13596.x free 14878976 Earle Luck R. 2014-05-02 PARAMETERS AND ABUNDANCES IN LUMINOUS STARS The Astronomical Journal 147 6 137 10.1088/0004-6256/147/6/137 0004-6256 Abundances in the Local Region. I. G and K Giants The Astronomical Journal Luck R. Earle . 150 3 88 2015 2015AJ....150...88L 1507.01466 10.1088/0004-6256/150/3/88 118505114 . 1 Tetzlaff N. Neuhäuser R. Hohle M. M. A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun Monthly Notices of the Royal Astronomical Society 410 1 190–200 January 2011 2011MNRAS.410..190T 1007.4883 10.1111/j.1365-2966.2010.17434.x free 118629873 . De Medeiros J. R. Udry S. Burki G. Mayor M. A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars 1 Astronomy and Astrophysics 395 97–98 2002 2002A&A...395...97D 1312.3474 10.1051/0004-6361:20021214 . Houk Nancy Smith-Moore M. Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars 4 Ann Arbor 1978 Dept. of Astronomy, University of Michigan 1988mcts.book.....H . Validation of the new Hipparcos reduction van Leeuwen F. Astronomy and Astrophysics 474 2 653–664 2007 0708.1752 2007A&A...474..653V 10.1051/0004-6361:20078357 18759600 Category:K-type giants Category:K-type supergiants Category:Canis Major CD-23 05189 Canis Majoris, 145 056577 035210 2764