HR 3831

HR 3831

A light curve for IM Velorum (HR 3831), plotted from TESS data.[1] The 2.852 day period[2] is shown in red.
Observation data
Epoch J2000      Equinox J2000
Constellation Vela
Right ascension 09h 36m 25.4069s[3]
Declination –48° 45′ 04.2549″[3]
Apparent magnitude (V) 6.232
Characteristics
HD 83368A
Spectral type A8V[3]
Apparent magnitude (G) 6.219[4]
Variable type Rapidly oscillating Ap
HD 83368B
Spectral type F9V[5]
Apparent magnitude (G) 8.995[6]
Astrometry
HD 83368A
Proper motion (μ) RA: -8.16±0.03 mas/yr[4]
Dec.: -18.85±0.03 mas/yr[4]
Parallax (π)14.01 ± 0.03 mas[4]
Distance232.8 ± 0.5 ly
(71.4 ± 0.2 pc)
HD 83368B
Radial velocity (Rv)-4.0±0.3[6] km/s
Proper motion (μ) RA: -9.41±0.19 mas/yr[6]
Dec.: -14.00±0.17 mas/yr[6]
Parallax (π)14.31 ± 0.15 mas[6]
Distance228 ± 2 ly
(69.9 ± 0.7 pc)
Details
HD 83368A
Mass1.78+0.12
−0.17[7] M☉
Radius2.003[8] R☉
Luminosity (bolometric)12.33[8] L☉
Surface gravity (log g)4.2[8] cgs
Temperature7650[8] K
Rotation2.851976±0.00003 d[8]
Rotational velocity (v sin i)33.8±1.0[7] km/s
Age0.93+0.42
−0.34[7] Gyr
HD 83368B
Surface gravity (log g)4 cgs
Other designations
CD−48 4831, HD 83368, HIP 47145, HR 3831, SAO 221339, GSC 08176-00283, IM Vel[3]
HD 83368A: 2MASS J09362541-4845042, TYC 8176-283-1
HD 83368B: 2MASS J09362537-4845072, Gaia DR2 5410092611662456704, TYC 8176-2818-1
Database references
SIMBADdata

HR 3831, also known as HD 83368, is a binary star system in the southern constellation of Vela at a distance of 233 light years. This object is barely visible to the naked eye as a dim, blue star with an apparent visual magnitude of 6.232. It is approaching the Earth with a heliocentric radial velocity of 4.0±0.3 km/s.[6]

The star system is a visual binary with a 3.29″ projected separation,[8] identified as such in 2002.[9] The larger star, HD 83368A, is a pulsating variable of a rapidly oscillating Ap type. It has a single yet strongly distorted dipole pulsation mode with a frequency of 1427 μHz.[10] The primary star is chemically peculiar, exhibiting spots of enhanced concentrations of lithium, europium and oxygen.[8]

The star's variability was discovered by Pierre Renson, and announced in 1977.[11] It was given its variable star designation, IM Velorum, in 1981.[12]

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  2. ^ Cite error: The named reference Kurtz was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference EDR3 was invoked but never defined (see the help page).
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  6. ^ a b c d e Cite error: The named reference EDR3B was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Sikora2018 was invoked but never defined (see the help page).
  8. ^ a b c d e f g Cite error: The named reference Kochukhov2005 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Schöller was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Bigot was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Renson was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Kholopov was invoked but never defined (see the help page).