Astronomy:HD 68375

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Short description: Star in the constellation of Camelopardalis
HD 68375
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Camelopardalis
Right ascension  08h 19m 32.2891s[1]
Declination +75° 45′ 24.866″[1]
Apparent magnitude (V) 5.54±0.01[2]
Characteristics
Evolutionary stage Horizontal branch[3]
Spectral type G8 III[4]
B−V color index +0.9[5]
Astrometry
Radial velocity (Rv)4.33±0.16[6] km/s
Proper motion (μ) RA: +32.404[1] mas/yr
Dec.: +15.893[1] mas/yr
Parallax (π)11.2853 ± 0.0516[1] mas
Distance289 ± 1 ly
(88.6 ± 0.4 pc)
Absolute magnitude (MV)+0.88[7]
Details
Mass1.91[8] M☉
Radius8.99[9] R☉
Luminosity49.4±0.5[10] L☉
Surface gravity (log g)2.77[11] cgs
Temperature5,078±5[9] K
Metallicity [Fe/H]−0.12±0.01[12] dex
Rotational velocity (v sin i)1.3±1.4[13] km/s
Age1.31[12] Gyr
Other designations
BD+76°310, FK5 310, GC 11246, HD 68375, HIP 40793, HR 3216, SAO 6487[14]
Database references
SIMBADdata

HD 68375 (HR 3216) is a solitary[15] star in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye with an apparent magnitude of 5.54[2] and is estimated to be 289 light years distant.[1] However, it is receding with a heliocentric radial velocity of 4.33 km/s.[6]

HD 68375 has a stellar classification of G8 III,[4] indicating that it is a red giant. It is currently on the horizontal branch, generating energy via fusion inside a helium core. Specifically, it is a red clump star, at the cool end of the horizontal branch where stars with near-solar metallicity are found.[3] After approximately 1 billion years,[12] the star now has a radius of 9 R☉ and an effective temperature of 5,078 K,[9] giving a yellow hue. Nevertheless, it has nearly double the mass of the Sun[8] and radiates at 49 times the luminosity of the Sun[10] from its enlarged photosphere. HD 68375 is slightly metal deficient with a metallicity 76% that of the Sun[12] and spins with a poorly constrained projected rotational velocity of 1.3 km/s.[13]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Ting, Yuan-Sen; Hawkins, Keith; Rix, Hans-Walter (3 May 2018). "A Large and Pristine Sample of Standard Candles across the Milky Way: ~100,000 Red Clump Stars with 3% Contamination". The Astrophysical Journal 858 (1): L7. doi:10.3847/2041-8213/aabf8e. ISSN 0004-637X. Bibcode: 2018ApJ...858L...7T. 
  4. ↑ 4.0 4.1 Cowley, A. P.; Bidelman, W. P. (February 1979). "MK spectral types for some F and G stars.". Publications of the Astronomical Society of the Pacific 91: 83. doi:10.1086/130446. ISSN 0004-6280. Bibcode: 1979PASP...91...83C. 
  5. ↑ Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication. Bibcode: 1970Priv.........0H. 
  6. ↑ 6.0 6.1 Soubiran, C.; Bienaymé, O.; Mishenina, T. V.; Kovtyukh, V. V. (9 January 2008). "Vertical distribution of Galactic disk stars". Astronomy & Astrophysics 480 (1): 91–101. doi:10.1051/0004-6361:20078788. ISSN 0004-6361. Bibcode: 2008A&A...480...91S. 
  7. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 Demarque, Pierre; Woo, Jong‐Hak; Kim, Yong‐Cheol; Yi, Sukyoung K. (December 2004). "Y2 Isochrones with an Improved Core Overshoot Treatment". The Astrophysical Journal Supplement Series 155 (2): 667–674. doi:10.1086/424966. ISSN 0067-0049. Bibcode: 2004ApJS..155..667D. 
  9. ↑ 9.0 9.1 9.2 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  10. ↑ 10.0 10.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  11. ↑ Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. ISSN 0004-6361. Bibcode: 1999A&A...352..555A. 
  12. ↑ 12.0 12.1 12.2 12.3 Ting, Yuan-Sen; Rix, Hans-Walter (10 June 2019). "The Vertical Motion History of Disk Stars throughout the Galaxy". The Astrophysical Journal 878 (1): 21. doi:10.3847/1538-4357/ab1ea5. Bibcode: 2019ApJ...878...21T. 
  13. ↑ 13.0 13.1 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. doi:10.1051/aas:1999401. ISSN 0365-0138. Bibcode: 1999A&AS..139..433D. 
  14. ↑ "HR+3216". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR%2B3216. 
  15. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 



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