Astronomy:HR 3831

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Short description: Binary star system in the constellation Vela

Coordinates: Sky map 09h 36m 25.4069s, −48° 45′ 04.2549″

HR 3831
250px
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
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|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 A8VSrCrEu[6]
Variable type Rapidly oscillating Ap[7]
HD 83368B
Spectral type F9V[6]
Astrometry
HD 83368A
Proper motion (μ) RA: −8.16±0.03[3] mas/yr
Dec.: −18.85±0.03[3] mas/yr
Parallax (π)14.01 ± 0.03[3] mas
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
Dec.: −14.00±0.17 mas/yr
Parallax (π)14.31 ± 0.15[5] mas
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[11]
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.[12] 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.[13] It was given its variable star designation, IM Velorum, in 1981.[14]

See also

  • Vela (Chinese astronomy)

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  2. ↑ Kurtz, D. W.; van Wyk, F; Roberts, G.; Marang, F.; Handler, G.; Medupe, R.; Kilkenny, D. (May 1997). "Frequency variability in the rapidly oscillating AP star HR 3831: three more years of monitoring". Monthly Notices of the Royal Astronomical Society 287 (1): 69–78. doi:10.1093/mnras/287.1.69. Bibcode: 1997MNRAS.287...69K. 
  3. ↑ 3.0 3.1 3.2 3.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  4. ↑ 4.0 4.1 Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002). "The Tycho double star catalogue". Astronomy and Astrophysics 384: 180. doi:10.1051/0004-6361:20011822. Bibcode: 2002A&A...384..180F. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  6. ↑ 6.0 6.1 Corbally, C. J. (1984). "Close visual binaries.I.MK classifications". The Astrophysical Journal Supplement Series 55: 657. doi:10.1086/190973. Bibcode: 1984ApJS...55..657C. 
  7. ↑ Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  8. ↑ 8.0 8.1 8.2 Sikora, J.; Wade, G. A.; Power, J.; Neiner, C. (2019). "A volume-limited survey of MCP stars within 100 pc – I. Fundamental parameters and chemical abundances". Monthly Notices of the Royal Astronomical Society 483 (2): 2300–2324. doi:10.1093/mnras/sty3105. Bibcode: 2019MNRAS.483.2300S. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 Kochukhov, O. (2005). "Pulsational line profile variation of the roAp star HR 3831". Astronomy & Astrophysics 446 (3): 1051–1070. doi:10.1051/0004-6361:20053345. 
  10. ↑ 10.0 10.1 10.2 10.3 10.4 Waisberg, Idel; Klein, Ygal; Katz, Boaz (April 2023). "Discovery of a 0.64 M☉, 13.4 au Companion to the roAp Star HIP 47145 = HR 3831 = IM Vel*" (in en). Research Notes of the AAS 7 (4): 66. doi:10.3847/2515-5172/accb5d. ISSN 2515-5172. 
  11. ↑ "HD 83368". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+83368. 
  12. ↑ Bigot, L.; Kurtz, D. W. (2011). "Theoretical light curves of dipole oscillations in roAp stars". Astronomy & Astrophysics 536: A73. doi:10.1051/0004-6361/201116981. Bibcode: 2011A&A...536A..73B. 
  13. ↑ Renson, P. (20 May 1977). "Periodicite d'Etoiles Ap Australes". Invormal Bulletin on Variable Stars 1280: 1. Bibcode: 1977IBVS.1280....1R. https://ibvs.konkoly.hu/pub/ibvs/1201/1280.pdf. Retrieved 20 October 2024. 
  14. ↑ Kholopov, P. N.; Samus, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (February 1981). "65th Name-List of Variable Stars". Information Bulletin on Variable Stars 1921: 1. Bibcode: 1981IBVS.1921....1K. https://ibvs.konkoly.hu/pub/ibvs/1901/1921.pdf. Retrieved 20 October 2024. 



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