BF Orionis

BF Orionis
	; A visual band light curve For BF Orionis, adapted from Grinin et al. (2010)
Observation data; Epoch J2000 Equinox J2000
Constellation	Orion
Right ascension	05h 37m 13.2624s
Declination	−06° 35′ 00.5654″
Apparent magnitude (V)	9.69
Characteristics
Evolutionary stage	Herbig Ae/Be star
Spectral type	A5II-III
Apparent magnitude (g)	10.38
Astrometry
Proper motion (μ)	RA: 0.873±0.025 mas/yr ; Dec.: 0.654±0.023 mas/yr
Parallax (π)	2.6173 ± 0.0279 mas
Distance	1,250 ± 10 ly ; (382 ± 4 pc)
Details
Mass	1.85+0.15; −0.00 M☉
Radius	1.59±0.20 R☉
Luminosity	39 L☉
Surface gravity (log g)	3.5 cgs
Temperature	8750 K
Rotational velocity (v sin i)	37±2 km/s
Age	17.14+2.80; −0.00 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
SIMBAD	data

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.^[7]

Properties

BF Orionis is a Herbig Ae/Be star variable similar to UX Orionis. 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_☉^[4] 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,^[1] 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.^[3] It also has small (0.11 magnitude) short-period, single-mode pulsations of the Delta Scuti type.^[9]

References

^ ^a ^b 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.
^ ^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. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ ^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.
^ ^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
^ 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. S2CID 121844237.
^ ^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.
^ Testi, L.; Palla, F.; Natta, A. (1998). "The onset of cluster formation around Herbig Ae/Be stars". arXiv:astro-ph/9811210.
^ 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 (1): 39. Bibcode:2001AstL...27...39S. doi:10.1134/1.1336861. S2CID 121443217.
^ 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.