HD 76653

HD 76653 is a single[7] star in the southern constellation Vela. It is faintly visible to the naked eye with an apparent visual magnitude of +5.71.[2] Based upon an annual parallax shift of 41.22 mas as seen from Earth, it is located 79 light years from the Sun. The star is moving closer to the Sun with a radial velocity of −6 km/s.[4] It is a probable (96% chance) co-moving companion of the nearby Delta Velorum; the two have an estimated physical separation of 2.2 ly (0.6605 pc) with similar proper motions.[6] Both are likely members of the Ursa Major association.[7]

HD 76653
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vela
Right ascension 08h 55m 11.7821s[1]
Declination −54° 57′ 56.7626″[1]
Apparent magnitude (V) 5.71[2]
Characteristics
Spectral type F6 V[3]
U−B color index +0.00[2]
B−V color index +0.48[2]
Astrometry
Radial velocity (Rv)−5.9±0.4[4] km/s
Proper motion (μ) RA: +24.318[1] mas/yr
Dec.: −91.713[1] mas/yr
Parallax (π)41.2156 ± 0.0871[1] mas
Distance79.1 ± 0.2 ly
(24.26 ± 0.05 pc)
Absolute magnitude (MV)+3.79[5]
Details
Mass1.22[6] M☉
Radius1.35±0.02[7] R☉
Luminosity2.72[8] L☉
Surface gravity (log g)4.28±0.10[7] cgs
Temperature6,296±80[7] K
Metallicity [Fe/H]−0.01±0.07[7] dex
Rotational velocity (v sin i)10.3±0.5[5] km/s
Age770±540[9] Myr
Other designations
CPD−54° 1925, GJ 3519, HD 76653, HIP 43797, HR 3570, SAO 236405[10]
Database references
SIMBADdata

This is an F-type main-sequence star with a stellar classification of F6 V.[3] It is larger than the Sun, with 1.22[6] times the mass of the Sun and 1.35[7] times the Sun's luminosity. The star is radiating 2.72[8] times the Sun's luminosity from its photosphere at an effective temperature of about 6,296 K.[7] Pace (2013) estimates HD 76653 to be 770 million years old,[9] while Fuhrmann and Chini (2012) date it to an age of around two billion years.[7] However, is an X-ray source with a luminosity of 214.3×1027 erg s−1, which is unusually high for the older age estimate.[7] The metallicity is near solar and it is spinning with a projected rotational velocity of 10.3 km/s.[5]

HD 76653 displays an infrared excess that suggests the presence of an orbiting debris disk. This excess was detected with the Spitzer Space Telescope both by the IRS instrument at 30−34 μm and weakly by MIPS at 70 μm. The dust has a temperature of about 73−77 K and is orbiting at a mean distance of 16−18 AU from the host star.[11]

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. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. Gray, R. O.; et al. (2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample", The Astronomical Journal, 132: 161, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
  4. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  5. Ammler-von Eiff, M.; Reiners, A. (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724.
  6. Shaya, Ed J.; Olling, Rob P. (January 2011), "Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue", The Astrophysical Journal Supplement, 192 (1): 2, arXiv:1007.0425, Bibcode:2011ApJS..192....2S, doi:10.1088/0067-0049/192/1/2.
  7. Fuhrmann, K; Chini, R (2012). "Multiplicity among F-type Stars". The Astrophysical Journal Supplement. 203 (2): 30. Bibcode:2012ApJS..203...30F. doi:10.1088/0067-0049/203/2/30.
  8. 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.
  9. Pace, G. (March 2013), "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram", Astronomy & Astrophysics, 551: 4, arXiv:1301.5651, Bibcode:2013A&A...551L...8P, doi:10.1051/0004-6361/201220364, L8.
  10. "HD 76653". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-10-25.
  11. Lawler, S. M.; et al. (November 2009), "Explorations Beyond the Snow Line: Spitzer/IRS Spectra of Debris Disks Around Solar-type Stars", The Astrophysical Journal, 705 (1): 89–111, arXiv:0909.0058, Bibcode:2009ApJ...705...89L, doi:10.1088/0004-637X/705/1/89.
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