HD 65907

HD 65907
Location of HD 65907 (circled in red)
Observation data
Epoch J2000      Equinox J2000
Constellation Carina[1]
Right ascension 07h 57m 46.9143s[2]
Declination −60° 18′ 11.059″[2]
Apparent magnitude (V) 5.59[1]
Characteristics
Evolutionary stage Blue straggler[3]
Spectral type F9.5V[1]
B−V color index 0.573±0.009[1]
Astrometry
Radial velocity (Rv)+14.9570±0.0003[4] km/s
Proper motion (μ) RA: +517.625 mas/yr[2]
Dec.: +119.206 mas/yr[2]
Parallax (π)61.8360±0.0417 mas[2]
Distance52.75 ± 0.04 ly
(16.17 ± 0.01 pc)
Absolute magnitude (MV)+4.54[1]
Details
Mass1.02+0.02
−0.01[5] M☉
Radius1.07±0.01[6] R☉
Luminosity1.30+0.04
−0.05[6] L☉
Surface gravity (log g)4.52±0.02[5] cgs
Temperature5,992±9[5] K
Metallicity [Fe/H]−0.315±0.005[5] dex
Rotational velocity (v sin i)1.04[3] km/s
Age11[3] Gyr
Other designations
CD−59°1773, HD 65907, HIP 38908, HR 3138, TYC 8911-793-1[7]
Database references
SIMBADA
B
C

HD 65907 is a star in the constellation Carina. At an apparent magnitude of +5.59, it is faintly visible to the naked eye in locations far from light pollution. Parallax measurements give a distance of 52.7 light-years (16.17 parsecs).

Characteristics

The spectrum of this star matches a spectral class of F9.5V,[1] with the luminosity class V suggesting that it is a main sequence star fusing atoms of hydrogen into helium at its core. Based on stellar isochrones, HD 65907 would be roughly 4.6 billion years old,[5] nearly the same as the Solar System, and it would be expected to be a population I star. However, the chemical properties and galactic orbit of this star strongly indicate that it is a population II star, which would place its actual age at 11 billion years. To account for its old age, the star must be a blue straggler, the product of a stellar merger. The merger happened five billion years ago and involved two stars with less than 0.5 solar masses.[3]

HD 65907 has 1.02 times the mass of the Sun[5] and 1.07 times the Sun's radius. It radiates 1.30 times the Sun's luminosity from its photosphere[6] at an effective temperature of 5,992 K.[5] This temperature give it the yellowish-white hue typical of a star near the F/G boundary.[8]

The star displays an infrared excess, indicating that it is surrounded by a debris disk. The disk has a radius of 96 astronomical units and a temperature of 30 K (−243.2 °C; −405.7 °F).[3]

HD 65907 is part of a triple star system also known as Gliese 294 or WDS J07578-6018.[9] The companions are named HD 65907 B and C, or Gliese 294 B and C, both red dwarfs with a combined spectral class of M0.5V,[10] and apparent magnitudes of +9.88 and +13.5, respectively.[11] The pair is separated at 60.6" from the F-type primary, with an estimated orbital period of 22,000 years, and the components B and C are separated by 2.468" from each other, with an estimated period of 270 years.[11]

References

  1. ^ a b c d e f 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. ^ a b c d 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. ^ a b c d e Rathsam, A.; Meléndez, J.; Karakas, A. I. (2025-01-01). "Beryllium: The smoking gun of a rejuvenated star". Astronomy & Astrophysics. 693: A26. doi:10.1051/0004-6361/202451197. ISSN 0004-6361.
  4. ^ Soubiran, C.; Jasniewicz, G.; Chemin, L.; Zurbach, C.; Brouillet, N.; Panuzzo, P.; Sartoretti, P.; Katz, D.; Le Campion, J.-F.; Marchal, O.; Hestroffer, D.; Thévenin, F.; Crifo, F.; Udry, S.; Cropper, M. (August 2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. ISSN 0004-6361.
  5. ^ a b c d e f g Shejeelammal, J.; Meléndez, Jorge; Rathsam, Anne; Martos, Giulia (October 2024). "The [Y/Mg] chemical clock in the Galactic disk: The influence of metallicity and the Galactic population in the solar neighbourhood". Astronomy and Astrophysics. 690: A107. Bibcode:2024A&A...690A.107S. doi:10.1051/0004-6361/202449669. ISSN 0004-6361.
  6. ^ a b c Harada, Caleb K.; et al. (June 2024). "Setting the Stage for the Search for Life with the Habitable Worlds Observatory: Properties of 164 Promising Planet-survey Targets". The Astrophysical Journal Supplement Series. 272 (2). id. 30. arXiv:2401.03047. Bibcode:2024ApJS..272...30H. doi:10.3847/1538-4365/ad3e81.
  7. ^ "HD 65907". SIMBAD. Centre de données astronomiques de Strasbourg.
  8. ^ "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. Archived from the original on 2013-12-03. Retrieved 2012-01-16.
  9. ^ "GJ 294". SIMBAD. Centre de données astronomiques de Strasbourg.
  10. ^ Reid, I. Neill; Hawley, Suzanne L.; Gizis, John E. (October 1995). "The Palomar/MSU Nearby-Star Spectroscopic Survey. I. The Northern M Dwarfs -Bandstrengths and Kinematics". The Astronomical Journal. 110: 1838. Bibcode:1995AJ....110.1838R. doi:10.1086/117655. ISSN 0004-6256.
  11. ^ a b Tokovinin, Andrei (March 2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5. ISSN 0067-0049.


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