HD 83446

This article is about M Velorum. For m Velorum, see HD 85622.
HD 83446
Observation data
Epoch J2000      Equinox J2000
Constellation Vela
Right ascension 09h 36m 49.53851s[1]
Declination −49° 21′ 18.0873″[1]
Apparent magnitude (V) 4.34[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A7 V[4]
B−V color index 0.173±0.005[2]
Variable type δ Sct[5]
Astrometry
Radial velocity (Rv)+17.8±0.5[6] km/s
Proper motion (μ) RA: −130.55[1] mas/yr
Dec.: +42.98[1] mas/yr
Parallax (π)30.4562 ± 0.1933 mas[1]
Distance107.1 ± 0.7 ly
(32.8 ± 0.2 pc)
Absolute magnitude (MV)1.79[2]
Details
Mass1.8+0.11
−0.09[7] M☉
Luminosity15.99[2] L☉
Surface gravity (log g)4.3±0.14[7] cgs
Temperature8,331±283[7] K
Rotational velocity (v sin i)155[8] km/s
Age453+256
−278[7] Myr
Other designations
M Vel, CD−48° 4836, FK5 2768, HD 83446, HIP 47175, HR 3836, SAO 221344[9]
Database references
SIMBADdata

HD 83446 is a probable astrometric binary[10] star system in the constellation Vela. It is visible to the naked eye with an apparent visual magnitude of 4.34.[2] Based upon an annual parallax shift of 30.5 mas,[1] it is located 107.1 light years from the Sun. The system is moving further away with a heliocentric radial velocity of +18 km/s.[6]

The visible component is an A-type main-sequence star with a stellar classification of A7 V.[4] Observations with the BRITE constellation led to this star's identification as a Delta Scuti variable with pulsation frequencies of 31.0806 and 34.2098 cycles per day, corresponding to periods of 46.3 and 42.1 minutes, respectively.[5] It has a high rate of spin with a projected rotational velocity of 155 km/s, which is giving the star an oblate shape with an equatorial bulge that is 6% larger than the polar radius.[8] The star is roughly 453[7] million years old with 1.8[7] times the mass of the Sun. It is radiating 16[2] times the Sun's luminosity from its photosphere at an effective temperature of 8,331 K.[7]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Zwintz2017 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  7. ^ a b c d e f g Cite error: The named reference gullikson2016 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference belle2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).