HD 37017

HD 37017

A light curve for V1046 Orionis, plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 35m 21.86770s[2]
Declination −04° 29′ 39.0409″[2]
Apparent magnitude (V) 6.553[3]
Characteristics
Evolutionary stage B2/3V[4] (B1.5 Vp He strong[5])
U−B color index −0.79[6]
B−V color index −0.14[6]
Variable type SX Ari[7]
Astrometry
Radial velocity (Rv)+32±2[8] km/s
Proper motion (μ) RA: 1.88±0.09[9] mas/yr
Dec.: 1.20±0.14[9] mas/yr
Parallax (π)2.643 ± 0.075 mas[9]
Distance1,230 ± 40 ly
(380 ± 10 pc)
Orbit[10]
Period (P)18.6556±0.0017 d
Semi-major axis (a)≥12.61±1.09 R☉
Eccentricity (e)0.31±0.05
Periastron epoch (T)2,435,461.602±0.168 JD
Argument of periastron (ω)
(secondary)		133±5°
Semi-amplitude (K1)
(primary)		36.0±2.5 km/s
Details
A
Mass8.50±0.53[3] M☉
Luminosity3,754[3] L☉
Temperature23,700[3] K
Rotation0.901 d[11]
Rotational velocity (v sin i)165[5] km/s
B
Mass4.5[10] M☉
Other designations
V1046 Orionis, BD−04°1183, HD 37017, HIP 26233, HR 1890, SAO 132317[12]
Database references
SIMBADdata

HD 37017 is a binary star system in the equatorial constellation of Orion. It has the variable star designation V1046 Orionis; HD 37017 is the identifier from the Henry Draper Catalogue. The system is a challenge to view with the naked eye, being close to the lower limit of visibility with a combined apparent visual magnitude of 6.55.[3] It is located at a distance of approximately 1,230 light years based on parallax,[9] and is drifting further away with a radial velocity of +32 km/s.[8] The system is part of star cluster NGC 1981.[13]

The binary nature of this system was suggested by A. Blaauw and T. S. van Albada in 1963.[10] It is a double-lined[11] spectroscopic binary with an orbital period of 18.6556 days and an eccentricity of 0.31.[14] The eccentricity is considered unusually large for such a close system.[11] It forms a suspected eclipsing binary that ranges in brightness from 6.54 down to 6.58.[7]

The primary is a helium-strong, magnetic chemically peculiar star[15] with a stellar classification of B1.5 Vp.[5] It has a magnetic field strength of 7,700 G,[16] and the helium concentrations are located at the magnetic poles.[17] V1046 Orionis was found to be a variable star by L. A. Balona in 1997,[11] and is now classified as an SX Arietis variable.[7] The star undergoes periodic changes in visual brightness, magnetic field strength, and spectral characteristics with a cycle time of 0.901175 days – the star's presumed rotation period.[11] Radio emission has been detected that varies with the rotation period.[17]

The secondary component has an estimated 4.5 times the mass of the Sun. The class has been estimated as type B6III-IV.[11]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference an331_4_349 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference houk1999 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference apj573_1_359 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference aj155_447 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference aj137_791 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Kounkel2017 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Leone1999 was invoked but never defined (see the help page).
  11. ^ a b c d e f Cite error: The named reference Bolton1998 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference mnras407_3_1875 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference aa525_A26 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Ghazaryan2019 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Trigilio2004 was invoked but never defined (see the help page).
  17. ^ a b Cite error: The named reference Leone1993 was invoked but never defined (see the help page).