AH Velorum

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AH Velorum
Observation data
Epoch J2000       Equinox J2000
Constellation Vela
Right ascension 08h 11m 59.96702s [1]
Declination −46° 38′ 39.6561″ [1]
Apparent magnitude  (V)5.70 [2] (5.50 – 5.89) [3]
Characteristics
Spectral type F7 Ib-II [4]
B−V color index 0.59 [5]
Variable type δ Cep [3]
Astrometry
Radial velocity (Rv)+26.0±2.9 [6]  km/s
Proper motion (μ)RA: −4.405 [1]   mas/yr
Dec.: +6.768 [1]   mas/yr
Parallax (π)1.2170 ± 0.0570  mas [1]
Distance 2,700 ± 100  ly
(820 ± 40  pc)
Absolute magnitude  (MV)−2.52 [7]
Details
Mass 7.0±0.5 [8]   M☉
Luminosity 929.98 [7]   L☉
Surface gravity (log g)1.66 [5]   cgs
Temperature 6,102 [5]   K
Metallicity [Fe/H]+0.09 [5]   dex
Rotational velocity (v sin i)10.0±0.5 [9]  km/s
Age 50.0±11.0 [8]   Myr
Other designations
CD−46°3902, HD  68808, HIP  40155, HR  3232, SAO  219587 [10]
Database references
SIMBAD data
Light curve of the classical Cepheid variable AH Velorum recorded by NASA's Transiting Exoplanet Survey Satellite (TESS) AH Velorum TESS lightcurve.png
Light curve of the classical Cepheid variable AH Velorum recorded by NASA's Transiting Exoplanet Survey Satellite (TESS)

AH Velorum is a single, [11] yellow-white hued star in the constellation Vela. It has an average apparent visual magnitude of 5.70, [2] which makes it bright enough to be dimly visible to the naked eye in good seeing conditions. The distance to this star can be estimated from its annual parallax shift of 1.217  mas , [1] which yields a separation of roughly 2,700  light years. It is moving further away from the Earth with a heliocentric radial velocity of +26 km/s. [6]

It is a bright giant/supergiant of spectral type F7 Ib-II. [12] The star is around 50 [8]  million years old with a projected rotational velocity of 10 km/s. [9] It has 7 [8] times the mass of the Sun and is radiating 930 [7] times the Sun's luminosity from its photosphere at an effective temperature of 6,102 K. [5]

A classical Cepheid variable, [3] its apparent magnitude ranges from 5.50 to 5.89 over 4.227171 days. [12] It pulsates in the first overtone, with a fundamental period of 6.04 days. [2]

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References

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  4. ↑ Houk, Nancy (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Ann Arbor: Dept. Of Astronomy. 2. Ann Arbor. Bibcode:1978mcts.book.....H.
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  8. 1 2 3 4 Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv: 1007.4883 , Bibcode:2011MNRAS.410..190T, doi: 10.1111/j.1365-2966.2010.17434.x , S2CID   118629873
  9. 1 2 Ammler-von Eiff, Matthias; Reiners, Ansgar (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, S2CID   53666672.
  10. ↑ "HD 68808". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 16 August 2018.
  11. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv: 0806.2878 . Bibcode:2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x . S2CID   14878976.
  12. 1 2 Watson, Christopher (4 January 2010). "AH Velorum". AAVSO Website. American Association of Variable Star Observers . Retrieved 12 March 2014.
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