HD 57197

This article is about M Puppis. Not to be confused with m Puppis.
HD 57197
Location of HD 57197 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension 07h 18m 04.24932s[1]
Declination −43° 59′ 12.4288″[1]
Apparent magnitude (V) 5.84±0.01[2]
Characteristics
Spectral type B8 II/III[3]
U−B color index −0.47[4]
B−V color index −0.14[4]
Astrometry
Radial velocity (Rv)13±10[5] km/s
Proper motion (μ) RA: −9.483 mas/yr[1]
Dec.: −5.396 mas/yr[1]
Parallax (π)5.1842 ± 0.0442 mas[1]
Distance629 ± 5 ly
(193 ± 2 pc)
Absolute magnitude (MV)−0.43[6]
Details
Mass3.08[7] M☉
Radius3.9±0.2[8] R☉
Luminosity234[9] L☉
Surface gravity (log g)3.77[7] cgs
Temperature12,596[9] K
Metallicity [Fe/H]−0.18[7] dex
Age220[10] Myr
Other designations
M Puppis, 85 G. Puppis[11], CD−43°3093, CPD−43°1430, GC 9732, HD 57197, HIP 35347, HR 2789, SAO 218618[12]
Database references
SIMBADdata

HD 57197, also known as M Puppis or HR 2789, is a suspected astrometric binary[13] located in the southern constellation Puppis, the poop deck. It has an apparent magnitude of 5.84,[2] making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia satellite, the system is estimated to be 629 light years away from the Solar System.[1] The value is poorly constrained, but it appears to be receding with a heliocentric radial velocity of 13 km/s.[5] At its current distance, HD 57197's brightness is diminished by 0.3 magnitudes due to interstellar dust.[14] It has an absolute magnitude of -0.43.[6]

The visible component has a stellar classification of B8 II/III, indicating that it is an evolved B-type star with the blended luminosity class of a bright giant and a giant star. HD 57197 is estimated to be 220 million years old,[10] enough time for it to expand to 3.9 times the Sun's radius.[8] It has 3.08 times the mass of the Sun[7] and radiates 234 times the luminosity of the Sun from its photosphere at an effective temperature of 12,596 K,[9] giving it a bluish-white hue. Based on its extinction in the Gaia passband, it has an iron abundance 66% that of the Sun.[7] This makes HD 57197 metal deficient.

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cousins1970 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Kharchenko2007 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).