HD 46509

Last updated
HD 46509
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 46509 on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Camelopardalis [1]
Right ascension 06h 40m 32.25255s [2]
Declination +71° 44 55.6296 [2]
Apparent magnitude  (V)5.86±0.01 [3]
Characteristics
Evolutionary stage red giant branch [2]
Spectral type G9 III [4] or K0 III [5]
B−V color index +1.19 [6]
Astrometry
Radial velocity (Rv)−24.02±0.19 [7] km/s
Proper motion (μ)RA: +4.653 mas/yr [2]
Dec.: +11.103 mas/yr [2]
Parallax (π)4.1248±0.0376  mas [2]
Distance 791 ± 7  ly
(242 ± 2  pc)
Absolute magnitude  (MV)−0.98 [1]
Details
Mass 5.64±1.82 [8]   M
Radius 27.3±0.6 [2]   R
Luminosity 399±7 [2]   L
Surface gravity (log g)2.34±0.11 [8]   cgs
Temperature 4,675±92 [8]   K
Metallicity [Fe/H]+0.12±0.05 [8]   dex
Rotational velocity (v sin i)1.5±1.2 [9]  km/s
Age 339+78
63
[8]   Myr
Other designations
AG+71°216, BD+71°359, FK5 2511, GC 8630, HD 46509, HIP 31946, HR 2396, SAO 5925 [10]
Database references
SIMBAD data

HD 46509, also designated as HR 2396, is a solitary star located in the northern circumpolar constellation Camelopardalis, the giraffe. It is faintly visible to the naked eye as a yellowish-orange hued point of light with an apparent magnitude of 5.86. [3] The object is located relatively far at a distance of 791 light-years based on Gaia DR3 parallax measurements, [2] but it is drifting closer with a heliocentric radial velocity of −24.02  km/s . [7] At its current distance, HD 46509's brightness is diminished by interstellar extinction of 0.31 magnitudes and it has an absolute magnitude of −0.98. [1]

HD 46509 has a stellar classification of either G9 III or K0 III, [4] [5] with both classes indicating that it is an evolved red giant. It is estimated to be 339 million years old, [8] enough time for it to cool and expand to 27.3 times the radius of the Sun. [2] HD 46509 has about 5.6 times the mass of the Sun [8] and it radiates 399 times the luminosity of the Sun [2] from its enlarged photosphere at an effective temperature of 4,675  K . [8] It is metal enriched with an iron abundance 132% that of the Sun's ([Fe/H] = +0.12) [8] and like most giant stars, it spins slowly with a projected rotational velocity of approximately 1.5  km/s . [9]

References

  1. 1 2 3 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 9 10 11 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.
  3. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 –L30. Bibcode:2000A&A...355L..27H. ISSN   0004-6361. S2CID   17128864.
  4. 1 2 Wilson, Ralph E.; Joy, Alfred H. (March 1950). "Radial Velocities of 2111 Stars". The Astrophysical Journal. 111: 221. Bibcode:1950ApJ...111..221W. doi:10.1086/145261. eISSN   1538-4357. ISSN   0004-637X. S2CID   122883647.
  5. 1 2 Halliday, Ian (September 1955). "Luminosity Function and Space Motions of G8-K1 Stars Derived from Spectroscopic Parallaxes". The Astrophysical Journal. 122: 222. Bibcode:1955ApJ...122..222H. doi: 10.1086/146080 . ISSN   0004-637X. S2CID   119640884.
  6. Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication. Bibcode:1970Priv.........0H. S2CID   231475662.
  7. 1 2 Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165. arXiv: astro-ph/0409579 . Bibcode:2005A&A...430..165F. doi: 10.1051/0004-6361:20041272 . S2CID   17804304.
  8. 1 2 3 4 5 6 7 8 9 Feuillet, Diane K.; Bovy, Jo; Holtzman, Jon; Girardi, Léo; MacDonald, Nick; Majewski, Steven R.; Nidever, David L. (20 January 2016). "Determining Ages of APOGEE Giants with Known Distances". The Astrophysical Journal. 817 (1): 40. arXiv: 1511.04088 . Bibcode:2016ApJ...817...40F. doi: 10.3847/0004-637X/817/1/40 . eISSN   1538-4357. S2CID   118675933.
  9. 1 2 de Medeiros, J. R.; Mayor, M. (November 1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433–460. Bibcode:1999A&AS..139..433D. doi: 10.1051/aas:1999401 . ISSN   0365-0138. S2CID   54046583.
  10. "HD 46509". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved July 17, 2023.