HD 40657

HD 40657 is a single[11] star in the equatorial constellation of Orion, near the constellation border with Monoceros. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.52.[2] The star is located at a distance of approximately 289 light years from the Sun based on parallax.[1] It is drifting further away with a radial velocity of +26 km/s.[5]

HD 40657
Location of HD 40657 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 06h 00m 03.34979s[1]
Declination −3° 04′ 27.3341″[1]
Apparent magnitude (V) 4.52[2]
Characteristics
Spectral type K1.5III-IIIb CN-1[3]
U−B color index +1.21[2]
B−V color index +1.22[2]
Variable type suspected[4]
Astrometry
Radial velocity (Rv)+25.9±0.9[5] km/s
Proper motion (μ) RA: +10.646[1] mas/yr
Dec.: −73.589[1] mas/yr
Parallax (π)11.2968 ± 0.2633[1] mas
Distance289 ± 7 ly
(89 ± 2 pc)
Absolute magnitude (MV)−1.00[6]
Details
Mass1.68[7] M☉
Radius25.06+0.84
−0.51[1] R☉
Luminosity196.4±5.2[1] L☉
Surface gravity (log g)2.42[8] cgs
Temperature4,317+53
−80[1] K
Metallicity [Fe/H]−0.48[6] dex
Rotational velocity (v sin i)2.1[9] km/s
Age2.27[7] Gyr
Other designations
NSV 2770, BD−03°1256, FK5 2457, GC 7587, HD 40657, HIP 28413, HR 2113, SAO 132732[10]
Database references
SIMBADdata

This is an aging giant star with a stellar classification of K1.5III-IIIb CN-1,[3] where the suffix notation indicates an underabundance of cyanogen in the spectrum. Having exhausted the supply of hydrogen at its core, this star cooled and expanded off the main sequence. At present it has 25 times the radius of the Sun.[1]

HD 40657 is a suspected variable star with a brightness that has been measured ranging from magnitude 4.54 down to 4.58.[4] It is an estimated 2.27[7] billion years old with 1.68[7] times the mass of the Sun and is spinning with a projected rotational velocity of 2.1 km/s.[9] The star is radiating 196 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,317 K.[1]

References
  1. 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.
  2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". The Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S.
  5. Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336.
  6. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. Vizier catalog entry
  7. Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". Astronomical Journal. 150 (3). 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88.
  8. Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497.
  9. De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. Vizier catalog entry
  10. "HD 40657". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-31.
  11. 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.
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