Coordinates: Sky map 05h 37m 13.2624s, −06° 35′ 00.5654″

BF Orionis
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 37m 13.2624s[1]
Declination −06° 35′ 00.5654″[1]
Apparent magnitude (V) 9.69
Evolutionary stage Herbig Ae/Be star
Spectral type A5II-III[2]
Apparent magnitude (g) 10.38
Proper motion (μ) RA: 0.873±0.025[1] mas/yr
Dec.: 0.654±0.023[1] mas/yr
Parallax (π)2.6173 ± 0.0279[1] mas
Distance1,250 ± 10 ly
(382 ± 4 pc)
[3] M
Radius1.59±0.20[3] R
Luminosity39[4] L
Surface gravity (log g)3.5[5] cgs
Temperature8750[5] K
Rotational velocity (v sin i)37±2[2] km/s
[3] Myr
Other designations
BD-06 1259, GSC 04778-01087, HIP 26403, 2MASS J05371326-0635005, Gaia DR2 3016930993175537536,Gaia EDR3 3016930993175889792, TYC 4778-1087-1
Database references

BF Orionis is a young Herbig Ae/Be star in the constellation of Orion about 1250 light years away, within the Orion Nebula. It is the most massive star of the small birth cluster of four stars.[6]


BF Orionis is a Herbig Ae/Be star variable similar to UX Orionis [de]. It is still accreting mass, producing about 2L through the release of gravitational energy, and is surrounded by a massive, optically thick protoplanetary disk of 0.005±0.002M[3] visible nearly edge-on. The brightness of the star is strongly variable, with irregular deep minima down to 13th magnitude. The variations are suspected to be partly caused by a brown dwarf or massive planet embedded in the protoplanetary disk,[7] together with very large comets.[8]

Unlike typical Herbig Ae/Be stars, 90-95% of which do not have detectable magnetic fields, BF Orionis has a fairly strong longitudinal magnetic field of −144±21 gauss.[2] It also has small (0.11 magnitude) short-period, single-mode pulsations of the Delta Scuti type.[9]


  1. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  2. ^ a b c Wade, G. A.; Bagnulo, S.; Drouin, D.; Landstreet, J. D.; Monin, D. (2007). "A search for strong, ordered magnetic fields in Herbig Ae/Be stars". Monthly Notices of the Royal Astronomical Society. 376 (3): 1145–1161. arXiv:astro-ph/0701387. Bibcode:2007MNRAS.376.1145W. doi:10.1111/j.1365-2966.2007.11495.x. S2CID 14156014.
  3. ^ a b c d Guzmán-Díaz, J.; Mendigutía, I.; Montesinos, B.; Oudmaijer, R. D.; Vioque, M.; Rodrigo, C.; Solano, E.; Meeus, G.; Marcos-Arenal, P. (2021), "Homogeneous study of Herbig Ae/Be stars from spectral energy distributions and Gaia EDR3", Astronomy & Astrophysics, 650: A182, arXiv:2104.11759, Bibcode:2021A&A...650A.182G, doi:10.1051/0004-6361/202039519, S2CID 233393918
  4. ^ Grinin, V. P.; Kozlova, O. V.; Natta, A.; Ilyin, I.; Tuominen, I.; Rostopchina, A. N.; Shakhovskoy, D. N. (2001). "Optical spectra of five UX Orionis-type stars". Astronomy and Astrophysics. 379 (2): 482. Bibcode:2001A&A...379..482G. doi:10.1051/0004-6361:20011280.
  5. ^ a b Mora, A.; Eiroa, C.; Natta, A.; Grady, C. A.; De Winter, D.; Davies, J. K.; Ferlet, R.; Harris, A. W.; Miranda, L. F.; Montesinos, B.; Oudmaijer, R. D.; Palacios, J.; Quirrenbach, A.; Rauer, H.; Alberdi, A.; Cameron, A.; Deeg, H. J.; Garzón, F.; Horne, K.; Merín, B.; Penny, A.; Schneider, J.; Solano, E.; Tsapras, Y.; Wesselius, P. R. (2004). "Dynamics of the circumstellar gas in the Herbig Ae stars BF Orionis, SV Cephei, WW Vulpeculae and XY Persei". Astronomy & Astrophysics. 419: 225–240. arXiv:astro-ph/0402614. Bibcode:2004A&A...419..225M. doi:10.1051/0004-6361:20040096. S2CID 17149403.
  6. ^ Testi, L.; Palla, F.; Natta, A. (1998). "The onset of cluster formation around Herbig Ae/Be stars". arXiv:astro-ph/9811210.
  7. ^ Grinin, V. P.; Rostopchina, A. N.; Barsunova, O. Yu.; Demidova, T. V. (2010). "Mechanism for cyclical activity of the Herbig Ae star BF Ori". Astrophysics. 53 (3): 367–372. Bibcode:2010Ap.....53..367G. doi:10.1007/s10511-010-9128-7. S2CID 56017726.
  8. ^ Shevchenko, V. S.; Ezhkova, O. V. (2001). "Long-Term Cyclicity of the Herbig Ae Star BF Ori: Giant Protocomets and Accretion from a Protoplanetary Disk". Astronomy Letters. 27: 39. Bibcode:2001AstL...27...39S. doi:10.1134/1.1336861. S2CID 121443217.
  9. ^ Marconi, M.; Ripepi, V.; Alcala', J. M.; Covino, E.; Palla, F.; Terranegra, L. (2000). "Pulsation in two Herbig Ae stars: HD 35929 and V351 Ori". Astronomy and Astrophysics. 355. arXiv:astro-ph/0002466. Bibcode:2000A&A...355L..35M.