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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
HD 83368A
Right ascension 09h 36m 25.4255s[3]
Declination −48° 45′ 04.240″[3]
Apparent magnitude (V) 6.23[4]
HD 83368B
Right ascension 09h 36m 25.3660s[5]
Declination −48° 45′ 07.505″[5]
Apparent magnitude (V) 10.31[4]
Characteristics
HD 83368A
Spectral type A8V[6]
Variable type Rapidly oscillating Ap
HD 83368B
Spectral type F9V[7]
Astrometry
HD 83368A
Proper motion (μ) RA: -8.16±0.03 mas/yr[3]
Dec.: -18.85±0.03 mas/yr[3]
Parallax (π)14.01±0.03 mas[3]
Distance232.8 ± 0.5 ly
(71.4 ± 0.2 pc)
HD 83368B
Radial velocity (Rv)-4.0±0.3[5] km/s
Proper motion (μ) RA: -9.41±0.19 mas/yr[5]
Dec.: -14.00±0.17 mas/yr[5]
Parallax (π)14.31 ± 0.15 mas[5]
Distance228 ± 2 ly
(69.9 ± 0.7 pc)
Details
Aa
Mass1.78+0.12
−0.17[8] M☉
Radius2.003[9] R☉
Luminosity (bolometric)12.33[9] L☉
Surface gravity (log g)4.2[9] cgs
Temperature7650[9] K
Rotation2.851976±0.00003 d[9]
Rotational velocity (v sin i)33.8±1.0[8] km/s
Age0.93+0.42
−0.34[8] Gyr
Ab
Mass0.64[10] M☉
Radius0.60[10] R☉
Temperature4,175[10] K
B
Mass1[10] M☉
Other designations
CD−48 4831, HD 83368, HIP 47145, HR 3831, SAO 221339, GSC 08176-00283, IM Vel[6]
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 triple 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.[5]

The star system is a hierarchical binary, made up of an inner and an outer pair. The inner pair has an orbital separation of 13 astronomical units, and contain the primary star, HR 3831 Aa, and the secondary HR 3831 Ab. The outer component have a 214 AU projected separation from the inner pair.[10] The primary star, HR 3831 Aa, 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.[11] The primary star is chemically peculiar, exhibiting spots of enhanced concentrations of lithium, europium and oxygen.[9]

The star's variability was discovered by Pierre Renson, and announced in 1977.[12] It was given its variable star designation, IM Velorum, in 1981.[13]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  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 DR3 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference tycho2 was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference DR3B was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBADB was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Sikora2018 was invoked but never defined (see the help page).
  9. ^ a b c d e f Cite error: The named reference Kochukhov2005 was invoked but never defined (see the help page).
  10. ^ a b c d e Cite error: The named reference Waisberg2023 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Bigot was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Renson was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Kholopov was invoked but never defined (see the help page).
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